GREE Installation And Service Manual - GiZ

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Installation and Service Manual

Models: GWC09AA - K5NNA6A

GREE Service Manual GWC09AA / K5NNA6A

Page 1

Imprint

Funds The publication was funded by the German Federal Ministry for the Environment, Nature Conservation and Nuclear Safety within the framework of the International Climate Initiative based on a decision of the German Federal Parliament. Federal Ministry for the Environment, Nature Conservation and Nuclear Safety (BMU) Programmbüro Internationale Klimaschutzinitiative Potsdamer Platz 10 10785 Berlin E-Mail: [email protected] Phone: +49 (0)30 408 190 - 218 Fax: +49 (0)30 408 190 – 303 Internet: http://www.international-climate-initiative.com Support The publication was supported by Deutsche Gesellschaft für Internationale Zusammenarbeit (GIZ) GmbH – German International Cooperation – Programme Proklima Dag-Hammarskjöld-Weg 1-5 65760 Eschborn, Germany Internet: www.giz.de/proklima Programme manager: Bernhard Siegele Contact: [email protected] Authors GREE Electric Appliances Inc., Rolf Huehren, IKET GmbH Reviewers Dr. Daniel Colbourne, Dr. Caroline Narayan

Editors Rebecca Kirch, Linda Ederberg

GREE Service Manual GWC09AA / K5NNA6A

Page 2

Table of Content - 1 Abbreviations used with this manual…………….....................

005

Other adjustments and functions of the remote controller..

035

Introduction…………………………………………....................

006

Hydrocarbon refrigerant R290 issues…………..................

038

General Safety Instructions……………………….....................

007

Refrigerant properties / parameters…………..................

038

The symbols used in this manual………………...................

007

Flammability…………………………………......................

039

Electrical operations…………………………….....................

009

Hazard identification…………………………....................

039

Installation site……………………………………...................

009

First aid measures……………………………...................

040

Minimum room size………………………………...................

010

Fire fighting measures………………………....................

041

Minimum requirements for service personnel qualification………………………………………….................................

Accidental release measures………………….................

041

011

Basics in RAC…………………………………………............

011

The handling of HC R290………………………...................

042

Checks for putting in operation…………………………............

012

Refrigerant recovery…………………………....................

043

Checks for leakage………………………………………............

012

Repair of leaks…………………………………..................

044

Handling of refrigerant…………………………………..............

012

Refrigerant gas detection……………………....................

045

Installation, commissioning and maintenance of a compressor………………………………………………...........................

Refrigerant cylinder handling……………….....................

046

012

Installation, commissioning and maintenance of a condenser …………………………………………………................

Refrigerant pressure– temperature chart……....................

048

013

Installation, commissioning and maintenance of an evaporator…………………………………………………........................

013

Flow of work for AC system installation, service, repair and dismantling………………….........................................

051

Piping………………………………………………………...........

013

AC system Installation…………………………....................

052

Description of the system and its components…………..........

014

Delivery conditions of indoor & outdoor unit....................

052

General technical specifications………………………...........

014

Principle installation arrangement………….....................

053

Indoor unit………………………………………………............

015

Tools, equipment and accessories……………................

054

Outdoor unit……………………………………………............

016

Security advise for installation………………...................

055

Refrigerant transfer pipe-set………………………….............

017

Table of various installation height and resulting room size……………………………..........................................

056

The installation site > general information…...................

056

Capacity variation ratio according to temperature (diagram)………………………………………………….............

018

Operation data……………………………………………............

018

Installation site > outdoor unit………………....................

057

Construction views > indoor unit……………………….............

019

Installation site > indoor unit…………………...................

057

Construction views > outdoor unit………………………...........

020

Installation dimension diagram………………..................

058

Refrigerant flow diagram………………………………..............

021

Installation check-list…………………………...................

059

Schematic diagram > Electrical wiring indoor unit……............

022

Safety measures for electrical equipment……................

060

Schematic diagram > Electrical wiring outdoor unit….............

023

Requirements for earthing…………………......................

060

Printed circuit board (PCB)………………………………...........

024

Miscellaneous…………………………………...................

060

Relay box…………………………………………………............

026

Installation procedure > indoor unit…………...................

061

Remote controller > functional description……………............

027

Installation of connection pipes and cables….................

062

Functional specifications for AC system operation……...........

031

Installation of outdoor unit……………………..................

065

Cooling mode……………………………………………..........

031

Interconnection of in– and outdoor unit……....................

066

Dry mode…………………………………………………..........

032

The quick-coupler valves……………………....................

067

System protective functions……………………………..........

033

Commissioning of the AC system……………….................

068

Fan and auto– mode……………………………………..........

034

GREE Service Manual GWC09AA / K5NNA6A

Checks before commissioning…………….................

068

Page 3

Table of Content - 2 Refrigerant circuit commissioning………………...................

068

Service label…………………………………….................

103

First operation of the system……………………...................

068

Dismantling, Recycling and disposal……………................

104

Indoor unit……..…………………………………....................

068

Error codes, LED flashing and trouble shooting.................

105

Outdoor unit………………………………………....................

069

Temperature sensor trouble shooting………...................

106

Handing over the system to your client………….....................

069

PG motor (H6) trouble shooting……………….................

107

Start-up data sheet form…………………………......................

070

Jumper cap (C5) trouble shooting…………….................

108

Service, repair and maintenance…………………....................

071

Freeze protection (E2) trouble shooting……..................

109

Directives for service and maintenance………….................

071

Low pressure (E3) trouble shooting…………..................

110

Regular annual preventive maintenance………………........

072

PCB board (U8) trouble shooting……………..................

111

Maintenance of the indoor unit………………………...........

072

Resistance table for temperature sensors……...............

112

Maintenance of the outdoor unit…………………….............

072

Main spare-parts list……………………………...................

115

Refrigerant circuit………………………………………...........

072

Disassembling procedures……………………….................

116

Maintenance check-list…………………………………..........

073

Disassembling the indoor unit………………....................

116

Safety work area & temporary flammable zones……..........

074

Disassembling the outdoor unit………………..................

121

Arrangement of equipment and tools…………………..........

075

Exploded views and part lists…………………....................

126

Refrigerant venting…………………………………….............

076

Exploded view of the indoor unit……………...................

126

Venting > course of activities > part 1………………….........

077

Part list of the indoor unit…………………...…..................

127

Venting > part 1 > detailed procedure………………….........

078

Exploded view of the outdoor unit…………….................

128

Venting > course of activities > part 2………………….........

079

Part list of the outdoor unit……………………..................

129

Venting > part 2 > detailed procedure………………….........

080

Recommended equipment and tools for the use with HC refrigerants……………………………..................................

130

Equipment for the use of OFDN (N2) in the field……...........

081

Flushing the system with OFDN (N2)…………………..........

083

Flushing the system and provision of “holding charge” with OFDN > detailed procedure……………..............................

084

Provision of a hermetically sealed refrigerant circuit............

085

Leak, strength and tightness testing……………………........

085

Leak check (bubble test)………………………………...........

087

Electronic gas detectors………………………………............

088

Leak testing with OFDN & weak soapy water solution.........

089

Leak testing with OFDN and “bubbles” > detailed procedure………………………………………………....................

090

Trace gas (N2/H2) leak detection method……………...........

091

Trace gas leak detection > detailed procedure……….........

093

Pressure test (strength test) with OFDN……………….........

094

Pressure test (strength test) > detailed procedure…….......

095

Refrigerant circuit > Evacuation and charging……............

096

Evacuation > detailed procedure……………………….........

099

Charging with refrigerant………………………………...........

100

Charging with refrigerant > detailed description……............

101

Start-up data sheet form for service and repair……….........

102

GREE Service Manual GWC09AA / K5NNA6A

Page 4

Abbreviations used within this manual:

Abbreviation

Clear Words

AC

Air– conditioning

HC

Hydrocarbon

LFL

Lower flammability level

OFDN

Oxygen free and dry nitrogen

PCB

Printed Circuit Board

PG motor

Indoor unit fan motor

PPE

Personnel protective equipment

RAC

Refrigeration and air– conditioning

UFL

Upper flammability level

GREE Service Manual GWC09AA / K5NNA6A

Page 5

INTRODUCTION ATTENTION

Please read this manual carefully before installing and operating the GREE Hydrocarbon Air– Conditioner unit. Careless installation and operation can cause severe injuries to operators, workers and damage to the air-conditioner unit itself. Keep this manual in a location for easy access as it is needed for reference during installation, maintenance, service and operation of the unit. This manual does not cover all aspects of installation, maintenance and service of the chiller units; if additional information is needed, contact the GREE Costumer Service or Sales Office.

General Information Warning and cautions appear at appropriate locations throughout this manual book.

GREE Service Manual GWC09AA / K5NNA6A

Page 6

General Safety Instructions Please pay careful attention to these safety instructions, to avoid risks to people and property. Before starting work on maintenance read this manual thoroughly and pay particular attention to the relevant chapters. Regardless of further requirements of the country in which the equipment will be installed: assembly, first start up, technical service, maintenance and repair, as well as dismantling and disposal have to be carried out by authorised personnel only. During every operation strictly follow the instructions within this manual. Pay attention to the specific rules of air conditioning, electrics and refrigerant handling of the country within which the equipment is installed. Key sections and/or sentences are highlighted with specific icons and symbols to the right side of the page. Please pay particular attention to this information. The symbols used in this manual are as follows: This is a specific Information window highlighting important content of the speremark and cific section or additional information to consider. points out the importance of a specific section

This sign will indicate that you are handling a flammable substance and the surrounding environment can possibly contain it.

This is a general warning sign.

This label is used to indicate that the flammable refrigerant is present within the application and service equipment

Images that indicate something that you should be strictly avoided

GREE Service Manual GWC09AA / K5NNA6A

Page 7

Specific bans!

Specific commandments!

Instructions for first aid!

Fire protection!

Carefully read the instructions

Working on components with safety-relevant functions jeopardises the safe operation of the installation. In case it is necessary to replace components, only use approved parts from GREE Electric, the Original Equipment Manufacturer (OEM) or Gree released or authorised components. The system contains the refrigerant R-290 (propane). This condition requires special safety precautions to be observed. While working on the system, the presence of any kind of ignition sources (e.g. sparks, open flames, hot surfaces, static electricity) are strictly prohibited. At the installation site, no matter what kind of activities are executed, smoking is strictly prohibited!

ONLY original GREE (OEM) spare-parts are permitted for Service and Repair!

Likewise, ensure the installation site is well ventilated. For further details on the handling of the refrigerant R-290 see also pages 11 and 41. Do not charge the system with any refrigerant which is not R-290! Do not mix any refrigerants! Before filling the system, ensure that there is no air (or other non-condensable gases such as nitrogen) left in the system, otherwise there is severe danger of damage to the system caused by excessive high pressure. After charging the system with refrigerant, carefully examine and confirm the tightness by the use of an appropriate electronic leak detector!

GREE Service Manual GWC09AA / K5NNA6A

Page 8

Electrical operations: Electric operations (installation, repair, modification, maintenance, adjustment) have to be fulfilled by trained and authorised personnel only. When dealing with electrical issues, the specific rules of the country within which the equipment is installed must be followed, in addition to the instructions within this manual. When working on the equipment or parts of it, the system has to be deenergised (by master switch, circuit breaker or separate cut-out) and made safe against restart of the system. Do not reconnect the system to the electric circuit until all work is done and all connections are tested. If handled unsafely or unprofessionally, severe electric shocks can occur. Consider the wiring diagram and follow the instructions of this manual very carefully whilst working on electrical parts. Wrong connections or incorrect grounding may lead to severe injuries and mortal danger.

Proceed according the manuals instructions!

Ground the system according to the particular requirements of the country within which the equipment is installed. Connect all the wires properly and durably. Loose cables may lead to overheating or fire.

Installation site: Ensure that the ceiling or the wall is solid enough to carry the weight of the system which will be mounted on it. Pay attention to the installation of the outdoor unit: operating noise and air flow should not bother neighbours. Make sure that appropriate measures are taken against noise emissions, especially when the system is to be installed close to sensitive facilities (such as hospitals). Insulate all tube connections professionally to avoid formation of water condensation and water damage to the rooms. The outdoor unit must be fixed to a flat, stable location. Thereby pay attention that in that location there is no snow, foliage or dirt accumulating. Take care of further requirements to prevent the system from damage by earthquakes, hurricanes or high winds. Do not touch movable parts and keep free from clothing. Do not touch any part of the system without wearing suitable personnel protective equipment and clothing in order to avoid injury from: the compressor (hot surface), the refrigerant condenser (hot surface, sharp fins) and the refrigeration tubes (hot and cold surfaces, sharp spots).

Regard neighbour protection, avoid disruptive noise emissions!

Avoid condensation of humidity at tubes and drains!

Pay attention to movable parts!

Wear suitable protective clothing!

Suitable personnel protective equipment is at a minimum: 1. 2. 3. 4.

Goggles Gloves Shoes Overalls

GREE Service Manual GWC09AA / K5NNA6A

Page 9

Do not install the system in humid places. Do not clean the system using water. Do not energise the system without the suitable air filter assembly to prevent dust accumulation within itself. Clean up the installation or service area once work is completed and ensure that no waste metal parts or wires remain in the equipment housing. If anything irregular or conspicuous occurs (such as burnt part, smell, loud noise, etc.) disconnect the system immediately and isolate from the electrical supply.

Minimum room size HC R-290 is a flammable refrigerant and can form explosive mixtures in low concentrations. To minimise the risk of fire or explosion, the system must be installed in a room with a minimum floor area.

GREE Service Manual GWC09AA / K5NNA6A

Having a malfunction while commissioning, immediately disconnect the system from mains!

Pay attention to the room size for indoor unit installation! For specific information refer page 56 of this manual.

Page 10

Minimum requirements for service personal qualification Unless there are further requirements, standards and legislation of the country within which the equipment is installed may apply. Any technicians that works on GREE hydrocarbon air–conditioners must be competent in the safe handling of flammable refrigerants, in addition to being in possession of knowledge and skills to maintain best refrigeration installation and servicing practices!

Get your Best Practices knowledge and skills updated for HC refrigerants and be certificated for these jobs!

There are already training activities in place for engineers, technicians and sales staff to provide professional knowledge and skills for the handling of HC refrigerants and refrigeration systems operating with HCs.

Get trained and have your “HC Refrigeration Professional” certification!

Basics in RAC Knowledge of the basic SI standard units for temperature, pressure, mass, density, energy. Understanding of the basic theory of refrigeration systems including the functions of the main components in the system (compressor, evaporator, condenser, thermostatic expansion valves). Understanding how to read a refrigerant flow chart and an electrical circuit diagram. The determination of non-condensable gases in the refrigeration system and how to eliminate them. The importance of the use of oxygen free dry nitrogen (OFDN) for system flushing, leak test and strength test. The elimination of humidity from the refrigeration system and how to recover or vent HC refrigerant from a system. Usage of tables and diagrams (log p/h diagram, saturation tables of a refrigerant, diagram of a single compression refrigeration cycle) and interpretation of these tables and diagrams. Knowledge of the basic operation of the following components in a refrigeration system and their role and importance for refrigerant leakage prevention and identification: • • • • • • • • • •

Temperature and pressure controls Sight class and moisture indicators Defrost controls, reverse cycle operation System protectors Measuring devices such as the pressure gauge manifold Thermometer Leak detector Refrigerant charging devices Vacuum pump Oxygen free dry nitrogen cylinder and pressure regulator

Fault finding – analysis and repair. • Knowledge of flammable refrigerants • Risk analysis for the application of flammable refrigerant and properties of

Read More! SAFETY CODE OF PRACTICE FOR REFRIGERATING SYSTEMS UTILISING A2 & A3 REFRIGERANTS

flammable refrigerants • Electrical circuit assessment and repair GREE Service Manual GWC09AA / K5NNA6A

ISBN 1 872719 15 5 Page 11

Checks before putting in operation, after a long period of nonuse, after maintenance or repair intervention or during operation Carry out a pressure and leak test to check the strength and the tightness of the system. Usage of a vacuum pump. Evacuation of the system to remove air and moisture according to standard practice.

Checks for leakage Knowledge of potential leakage points of refrigeration, air-conditioning and heat pump equipment. Making a visual and manual inspection of the whole system. Carry out a check for leakage of the system using an indirect method and/or one of the direct methods. Direct leak detection methods 1. Fixed leakage detection systems 2. Portable electronic gas detectors 3. Ultraviolet (UV) indication fluids 4. Weak soapy water solution (bubble test) also in combination with OFDN 5. New installation tightness test for leakage detection procedure e.g. H2/N2 6. Operational system tightness test for leakage detection procedure Indirect refrigerant detection methods: 1. Visual 2. Manual checks Use of portable measuring devices such as pressure gauges, thermometers and multi-meters for measuring Volt/Amp/Ohm in the context of indirect methods for leakage checking and interpretation of the measured parameters. It is very important to make use of an electronic gas detection device. Take care that the electronic gas detector is designed and certificated for the use with flammable refrigerants. Additionally, the electronic HC gas detector must be part of the Personnel Protective Equipment (PPE) of the technician because if this device is operational in the work area it will warn by detection and signalling if HC refrigerant is in the atmosphere.

The use of OFDN is important and the HC gas detector is indeed a personnel protection device (PPE)!

Handling of the refrigerant during installation, maintenance, servicing or, recovery or venting Use scales to weigh refrigerant. Knowledge of the requirements and procedures for handling, storage and transportation, especially of flammable refrigerants and especially of contaminated refrigerant and oils. Safe HC refrigerant recovery and venting.

Installation, commissioning and maintenance of a compressor The basic functioning of a compressor (including capacity control and lubricating system) and risks of refrigerant leakage to its operation. Installing a compressor properly, including control and safety equipment. Adjusting the safety and control switches. Checking the oil return system. Start up and shut down a compressor and checking the good working conditions of the compressor, including by making measurements during operation of compressor. GREE Service Manual GWC09AA / K5NNA6A

Page 12

Installation, commissioning and maintenance of condensers The basic functioning of a condenser. Installing a condenser properly, including control and safety equipment. Adjusting the safety and control switches. Checking the hot-gas and liquid lines in correct positions. Start up and shut down a condenser and check the good working conditions, including by making measurements during operation. Checking the surface of the condenser. Methods for condenser surface cleaning and fins adjustments.

Installation, commissioning and maintenance of evaporators The basic functioning of an evaporator (including defrosting system). Installation of an evaporator including control and safety equipment. Adjusting the safety and control switches. Checking the liquid and suction pipelines in the correct position and checking the hot gas defrost pipeline. Start up and shut down an evaporator and check the good working of the evaporator, including by making measurements during operation. Functional checking of the reverse cycling control device. Checking the surface of the evaporator. Methods for evaporator surface cleaning and fins adjustments.

Preventive maintenance will improve the system efficiency

Piping Professional brazing is another key component for safe and state-of-the-art HC system installation and servicing. Brazing leak-free joints on metallic tubes and pipes that can be used in refrigeration, air-conditioning or heat pump systems. Make/check pipe and component supports and vibration elimination. Knowledge about the designing and dimensioning of the different refrigeration system section pipes including risers. The behaviour of lubricants within the refrigeration system and the influences of the dimensioning of pipe work in relation to lubricants. Develop strategies to minimise mechanical connections like flaring or flanges and to provide a sealed (hermetic) system.

GREE Service Manual GWC09AA / K5NNA6A

Regular professional brazing experience is an important precondition for the work with hydrocarbon refrigerants!

Page 13

Description of the system and its components Unit Specifications GWC09AA—K5NNA4A General Technical Specifications Split-type On/Off

Item Parameter No

Unit

1

Model

2

Product Code

GWC09AA-K5NNA4A

Rated Voltage 3

Value

Power SupRated Frequency ply

CA115012800 V~

220-240

Hz

50

Phases

1

4

Power Supply Mode

5

Cooling Capacity

W

2650

6

Heating Capacity

W

NA

7

Cooling Power Input

W

883

8

Heating Power Input

W

NA

9

Cooling Power Current

A

3.92

10 Heating Power Current

A

NA

11 Rated Input

W

995

12 Rated Current

A

4.41

m3/h

480/460/420/380/-

L/h

0,8

15 EER

W/W

3,0

16 COP

W/W

NA

17 SEER

W/W

NA

18 HSPF

W/W

NA

m2

12-18

13 Air Flow Volume( SH/H/M/L/SL) 14 Dehumidifying Volume

19 Application Area

GREE Service Manual GWC09AA / K5NNA6A

Indoor

Page 14

Indoor Unit Item Parameter No

Unit

Value

20

Model of indoor unit

21

Fan Type

22

Diameter Length( D x L)

mm

Ø 85x615

23

Fan Motor Cooling Speed (SH/H/M/L/SL)

r/min

1350/1150/1050/950/-

24

Fan Motor Heating Speed (SH/H/ML/SL)

r/min

NA

25

Output of Fan Motor

W

10

26

Fan Motor RLA

A

0.10

27

Fan Motor Capacitor

µF

1

28

Input of Heater

W

NA

29

Evaporator Form

30

Indoor

31 32

Unit

GWC09AA-K5NNA4A/I Cross-flow

Aluminium Fin-copper Tube

Pipe Diameter

mm

Ø7

Row-fin Gap

mm

2-1.6

Coil Length (LXDXW)

mm

603X264X25.4

33

Swing Motor Model

34

Output of Swing Motor

W

2

35

Fuse

A

PCB 3.15A Transformer 0.2A

36

Sound Pressure Level (SH/H/M/L)

dB (A)

38/36/33/30

37

Sound Power Level (SH/H/M/L)

dB (A)

48/46/43/40

38

Dimension (WXHXD)

mm

815×165×267

39

Dimension of Carton Box (L/W/H)

mm

975×320×385

40

Dimension of Package(L/W/H)

mm

978X323X400

41

Net Weight

kg

14

42

Gross Weight

kg

18

GREE Service Manual GWC09AA / K5NNA6A

MP28VB

Page 15

Outdoor Unit Item Parameter No

Unit

Value

43

Model of Outdoor Unit

44

Compressor Manufacturer/Trademark

45

Compressor Model

46

Compressor Oil

47

Compressor Type

48

L.R.A.

A

21.00

49

Compressor RLA

A

3.90

50

Compressor Power Input

W

820

51

Overload Protector

Internal

52

Throttling Method

Capillary

53

Outdoor Unit

GWC09AA-K5NNA4A/O ZHUHAI LANDA COMPRESSOR CO,LTD/GREE

QXD-C184A030A CP2922HT(EXP3535) Rotary

Operation Temp



16ºC~30ºC

54

Ambient Temp (Cooling)



18ºC~43ºC

56

Condenser Form

57

Pipe Diameter

mm

Ø5

58

Rows-fin Gap

mm

1-1.3

59

Coil Length (LXDXW)

mm

741×495.3×12.7

60

Fan Motor Speed

rpm

860±20

61

Output of Fan Motor

W

25

62

Fan Motor RLA

A

0,45

63

Fan Motor Capacitor

µF

2.5

3

1800

64

Air Flow Volume of Outdoor Unit

65

Fan Type

66

Fan Diameter

GREE Service Manual GWC09AA / K5NNA6A

Aluminium Fin-copper Tube

m /h

Axial-flow mm

Ø400

Page 16

Item Parameter No

Unit

Value

68

Climate Type

T1

69

Isolation

I

70

Moisture Protection

71 72

Permissible Excessive Operating Pressure for the Discharge Side Permissible Excessive Operating Pressure for the Suction Side

IP24 MPa

2.5

MPa

0.5

73

Sound Pressure Level (H/M/L)

dB (A)

50

74

Sound Power Level (H/M/L)

dB (A)

60

Dimension (WXHXD)

mm

848X540X320

76

Dimension of Carton Box (L/W/H)

mm

878X360X580

77

Dimension of Package (L/W/H)

mm

881X363X595

78

Net Weight

kg

35

79

Gross Weight

kg

39

80

Refrigerant

81

Refrigerant Charge

kg

0.20

82

Length

m

5

83

Gas Additional Charge

g/m

Not Permitted

84

Outer Diameter Liquid Pipe

mm

Ø6

mm

Ø12

Outdoor 75 Unit

Connec85 tion Pipe Outer Diameter Gas Pipe

R-290

86

Max Distance Height

m

4

87

Max Distance Length

m

5

88

20'GP

set

95

set

198

set

225

Container 40' GP Loading 90 Quantity 40' HQ 89

GREE Service Manual GWC09AA / K5NNA6A

The unit is an INTRINSIC SAFE System! Refrigerant charge is limited to 200 gram Top-up of charge is not permitted Modification of system and in specific the preassembled pipe-length is not permitted!

Page 17

Capacity Variation Ratio According to Temperature Cooling Mode Only

Operation Data Temperature Conditions in °C Indoor

Outdoor

27/19

35/24

Model Name

9K

Standard Pressure

Heat Exchanger Pipe Temperature

P (MPa)

T1 (°C)

T2 (°C)

0.5 to 0.6

8 to 11

83 to 38

Indoor Fan Mode

Outdoor Fan Mode

Super High

860

Notes: 1. 2. 3. 4. 5.

Measure surface temperature of heat exchanger pipe around centre of heat exchanger path (U-Bend) (Thermistor Thermometer) Connection piping conditions (Liquid / Suction) fixed at 5 m P = Suction - Pressure of refrigerant measured at service port connection T1 = Inlet and Outlet Temperature of evaporator (pipe surface Temperature) T2 = Inlet and Outlet Temperature of condenser (pipe surface Temperature)

GREE Service Manual GWC09AA / K5NNA6A

Modification of pipe-length is not permitted!

Page 18

Construction Views (All Dimensions in mm) Indoor Unit The indoor unit is equipped with pre-fixed and isolated refrigerant transfer pipes! The length of the pipes is 5 m. The indoor-unit is pre-charged with HC R-290 refrigerant In addition prefixed is: 1. Electrical connections between indoor and outdoor unit 2. Mains-supply cable with plug 3. Condensate drain pipe

Wall Mounted Plate

GREE Service Manual GWC09AA / K5NNA6A

Page 19

Outdoor Unit

GREE Service Manual GWC09AA / K5NNA6A

Page 20

Refrigerant Flow Diagram

9 1

7 3

2 P1

8

10 T3

T1

T4

T2

5

4

5

6

Designation

Remark

1

Compressor

Rotary scroll

2

Condenser

Finned Heat Exchanger

3

Evaporator

Finned Heat Exchanger

4

Capillary tube

Refrigerant expansion device

5

Strainer

Refrigerant filtering device

6

2 - way valve

Stop valve

7

3 – way valve

Stop valve and ¼” SAE service port

8

Service Port

1/4” NPT

9

Indoor unit

Pre-assembled with 5 m refrigerant transfer pipes

10

Outdoor unit

P1

Suction pressure

R-290 low pressure gauge measuring

T1

Temperature Air- inlet

Room air entering evaporator

T2

Temperature Air- outlet

Room air leaving evaporator

T3

Temperature Air- inlet

Outside air entering the condenser

T4

Temperature Air- outlet

Outside air leaving the condenser

GREE Service Manual GWC09AA / K5NNA6A

Page 21

Schematic diagram Do not modify electrical components or wiring, for replacements. Only use OEM spare-parts!

Electrical Data Meaning of Marking • Indoor Unit



Symbol

Colour Symbol

Symbol

Colour of Symbol

BU

Blue

BN

Brown

YE

Yellow

WH

White

RD

Red

BK

Black

YEGN

Yellow / Green

Protective Earth

Outdoor Unit Symbol

Parts Name

Symbol

Colour Symbol

Symbol

Colour of Symbol

C1

CBB61

BN

Brown

WH

White

C2

CBB65

BU

Blue

YE

Yellow

SAT

Overload

BK

Black

RD

Red

COMP

Compressor

OG

Orange

YEGN

Yellow / Green

Protective Earth

GN

Green

Electrical Wiring - Indoor Unit These circuit diagrams are subject to change without notice, please refer to the one supplied with the unit.

GREE Service Manual GWC09AA / K5NNA6A

Page 22

Electrical Wiring - Outdoor Unit These circuit diagrams are subject to change without notice, please refer to the one supplied with the unit.

GREE Service Manual GWC09AA / K5NNA6A

Do not modify electrical components or wiring, for replacements only use OEM spare-parts!

Page 23

Printed Circuit Board (top-view)

No.

Name on PCB board

Interface Name

No.

Name on PCB board

Interface Name

1

N, N1

Neutral wire of PCB

10

OUTROOM

Outdoor ambient temperature sensor

2

TR-IN

Transformer input terminal

11

ROOM

Indoor ambient temperature sensor

3

PG

PG motor control

12

TUBE

Indoor tube temperature sensor

4

COM— INNER1

Relay box control

13

TR-OUT

Transformer output terminal

5

SWING

Swing motor control

14

AC-L1

Live wire input terminal of relay box

6

PGF

PG motor feedback

15

FU2

Fuse

7

JUMP

Jumper cap

16

AC_L

Live wire input

8

DISP2

Display connector 2

17

/

PCB indoor unit relay box

9

DISP1

Display connector 1

18

LPP

Low pressure switch

GREE Service Manual GWC09AA / K5NNA6A

Page 24

Printed Circuit Board (bottom-view) Right

Up

Left

Down Do not modify electrical components or wiring, for replacements only use OEM spare-parts!

GREE Service Manual GWC09AA / K5NNA6A

Page 25

Relay Box (top-view) Do not modify electrical components or wiring, for replacements only use OEM spare-parts!

Relay Box (bottom-view)

Up

Right

Left

Down

GREE Service Manual GWC09AA / K5NNA6A

Page 26

Functional description and controls The remote control

GREE Service Manual GWC09AA / K5NNA6A

Page 27

GREE Service Manual GWC09AA / K5NNA6A

Page 28

Unit Functions

GREE Service Manual GWC09AA / K5NNA6A

Page 29

Replacement of batteries: 1: Remove the battery cover plate from the rear of the remote controller. 2: Take off the used batteries 3: Insert two new AAA1.5V batteries and pay attention to the polarity. 4: Reinstall the battery cover plate. Please notice: When replacing the batteries, do not use used or different types of batteries, otherwise it may cause malfunction. If the remote controller will not be used for a long time, please remove batteries to avoid leaking. Make sure that used batteries are disposed of according to local regulations. Most often batteries are not allowed to be part of domestic waste. If the remote controller does not operate correctly, please take the batteries out and reinsert them after at least 30 seconds. If the malfunction is still valid, replace the batteries. Battery Replacement GREE Service Manual GWC09AA / K5NNA6A

Page 30

Functional specifications Temperatures and basic functions To describe the functions there are two temperatures applied. The preset indoor temperature (Tpreset) and the ambient temperature (Tamb.). After energizing the system, the compressor must not be restarted, after a standstill of at least three minutes. After a blackout, the compressor likewise can only be restarted after a time gap of at least three (3) minutes, provided that the system already was switched on (ON status). If the unit is at on status before power failure, the compressor shall be restarted with three minutes delay. After having started the compressor, it runs for further six minutes even if the ambient temperature changes. Cooling Mode Conditions and process The system starts cooling, if the ambient temperature is higher or equal to the preset temperature +1°C (T amb ≥ Tpreset +1°C). Under this condition the compressor and the outdoor unit fan are running adequately to the requested performance. The indoor fan runs at the adjusted speed.

After switching on the unit, the compressor starts with three minutes time delay!

In case of lower or equal ambient temperature in comparison to the preset value -1°C (T amb≤ Tpreset -1°C), the compressor and the outdoor unit fan wil l be switched off. The indoor fan runs at the adjusted speed. In the range of ambient temperature being higher than the preset value for -1°C but lower than the preselection of + 1°C (T preset -1°C < T amb < Tpreset +1°C) the system will not change its status. As to that please compare the following schedule:

In this mode the temperature ranges between 16 to 30°C. On the display of the indoor unit the symbols “OPERATION, COOLING” and the temperature preset value are indicated. GREE Service Manual GWC09AA / K5NNA6A

Page 31

DRY Mode In general the air humidity will be reduced in cool mode. In dry mode extra drying is possible by reducing the fan speed. Dry Mode conditions and process The system starts cooling and dehumidifying if the ambient temperature is higher or equal to the preset temperature +2°C (T amb ≥ Tpreset +2°C). Under this condition the compressor and the outdoor unit fan are running adequately to the requested performance. Meanwhile the fan of the indoor unit is decelerated to LOW position. In case of higher or equal ambient temperature in comparison to the preset value -2°C, but lower or equal to the preset value of +2°C (T preset -2°C ≤ Tamb ≤ Tpreset +2°C), the system starts the dehumidifying functio n. So the fan of the indoor unit is decelerated to LOW position. The compressor, as well as the outdoor unit fan will run for six further minutes then they are switched off for four minutes. This cycle repeats in the DRY MODE. In the range of ambient temperature being lower or equal to the preset value for -2°C (T amb ≤ Tpreset -2°C), the system will switch off the compressor a nd the fan of the outdoor unit. The fan of the indoor unit is decelerated to LOW position. As to that please compare the following schedule:

The temperature ranges between 16 to 30°C. On the d isplay of the indoor unit the symbols “OPERATION, COOLING” and the temperature preset value are indicated.

GREE Service Manual GWC09AA / K5NNA6A

Page 32

Protective functions Anti-Freezing Protection The system is fitted with an anti-freezing protection. This prevents the evaporator being covered with ice. Additionally, the system supervises the evaporator. In case ice formation is detected, the anti–freezer is automatically activated. By that the compressor and the outdoor unit fan are de-energised, while the indoor unit fan maintains running at the optional preselected speed. Fixing the hazard of ice formation and having switched off the compressor for at least three minutes, the system restarts in the formerly (preselected) mode. By way of illustration please compare to the figure:

Overload Protection The system is equipped with an overvoltage protection that should avoid damage to the systems components. As soon as the system exceeds the permissible stress for three consecutive seconds, the system will stop every function apart from the indoor unit fan, which runs further. If there won’t be an overvoltage metered three minutes later, the system restarts automatically and resume working with the pre-assigned mode. In case of tripping the overvoltage protection for overall six times in succession, the system ceases operating, except the indoor unit fan. After that cutoff, you should deactivate the system completely by the remote control unit and reboot it. While the overvoltage protection is active, the display of the indoor unit shows the error code E 5. In addition to that, the operation indicator lamp flashes five times, interrupted by a break of three seconds. If the compressor runs for at least six minutes at a stretch, the counter for the overvoltage protector will be reset.

E5 Error Code: “Evaporator temperature too high protection” Refer page 105 for further error code clarifications.

“Evaporator Temperature To High” protection

GREE Service Manual GWC09AA / K5NNA6A

Page 33

FAN MODE Using this mode the indoor unit fan runs at its preselected speed. Any other part of the system (compressor and outdoor unit fan) is de-energised. The pre-selection of temperature may range between 16 and 30°C. The indoor unit display signals the Icon OPERATION beside the preselected temperature.

AUTO MODE Opting the AUTO mode, system changes to the action, which considers close to the registered room condition (COOLING or FAN). Concerning the modes check against upside. The indoor unit display shows you the icon OPERATION, as well as matching to the actual choice, the dedicated icon (COOLING, FAN). Moreover the preselected temperature is displayed. Please note the delay of 30 seconds before the system changes mode. The safety functions correspond to those in the particularly represented mode.

GREE Service Manual GWC09AA / K5NNA6A

Page 34

Other adjustments and functions of the remote controller Timer function The system is equipped with two Timer settings as there is the common Timer and a Time pre-selection. These Timers can be optionally adjusted by the remote control unit. General Timer If the system is switched off, the Timer can be switched ON. By reaching the time preset, system restarts in the same manner as before the switch is off. The interval of the Timer adjustment is half an hour and can be set from 0.5 up to 24 hours. Timer function may be adjusted while system operation is in OFF position. As soon as the preselected time is over, the system stops automatically. The interval is even 0.5 hours, time setting from 0.5 up to 24 hours. Clock Timer Tripping the Timer ON when the system operates, it will continue operation. If the system is de-energised, when the Timer is switched ON, it will restart after the preselected time under the previously chosen conditions. Putting the timer in OFF position in system standstill, it stays de-energised. In case the timer is switched in OFF position during system operation, it will go on until it reaches the preselected time set. Timer Change If the system is activated in a certain timer status (to be seen above) it can be switched ON/OFF by pressing the corresponding key. Timer will be reset. Putting the timer in ON, as well as OFF during system operation, it continues operation into the preset time (Timer OFF) is over. Then it will stop automatically. If there are two timer sets for ON and OFF Timer during system standstill, it remains disconnected until the ON Timer is reached. It is reinitiated after that. Buzzer Whenever the indoor unit gets a signal - pushing a button on the unit itself or on the remote control unit – or by switching on, it makes a sound. Sleep function This function gives a selection of diverse graphics of preselected temperatures for sleep time. Turbo Function This function may be set in COOLING mode. Automatic Control of Fan speed The system will automatically choose the speed of the indoor unit fan (LOW, MEDIUM, HIGH), dependent on the ambient temperature.

GREE Service Manual GWC09AA / K5NNA6A

Page 35

Air flow direction As described above, the indoor unit is able to blow out air into various directions. After energizing the system the electric motor moves the air flap counterclockwise in zero position to close the air outlet. Switching on the system and no flap move or swing is adjusted, the motor will move the air outlet flap clockwise to L. If the system is energized and a swing was preselected, the flap will move matching the preset between D and L position. There are 7 possible adjustments to be chosen (look ahead) in addition to L, A, B, C, D and 0. De-energising the system the flap will move to zero position. Please note: If the position is set by the remote control unit between I and B, A and C or B and D, the air outlet flap anyhow goes between the positions L and D.

GREE Service Manual GWC09AA / K5NNA6A

Page 36

Display Activating the indoor unit, every icon will beam. In stand-by condition, operation indicator will shine red. Starting the system by the remote control unit, the operation indicator is ON and the corresponding icons will appear in the actual mode (COOLING, DRY, FAN). Error Codes Error codes illuminate with specific system failure or components deficiency conditions. Please refer to page 105 for decoding of the specific error codes: Locked protection to Outdoor Unit fan motor (PG motor) When starting the fan, if the motors rotational speed is slow for a period of time, the unit will display LOCKED and stop running to avoid auto protection of the compressor motor. If the system is energized the indoor unit will display H6.

H6 Error Code Indicates low speed or not functional outdoor unit fan. Refer page 105 and 107 for further error code clarifications.

Memory function The system memorises the files for the different system modes, air swing flap angle, light, temperature preset and fan speed. Having reconstructed the power supply after a blackout, the system will continue its operation corresponding to the filed parameters. If there has been a timer adjustment, which has not yet worked out, the system recalculates the timer duration with the assistance of the stored information and will perform adequately. The clock timer cannot be saved.

GREE Service Manual GWC09AA / K5NNA6A

Page 37

HC R290 refrigerant issues Basics HC R-290 (propane) is an odourless and colourless gas of the group of hydrocarbons. HC R-290 is heavier than air and at high concentrations can cause narcotic effects and eventually asphyxiation. R-290 is highly flammable within the range of 2.1% and 9.5% by volume, or 38 g/m3 to 170 g/m3 in air. The auto-ignition temperature is about 470°C. Since R-290 is an odourless and colourless gas, it is difficult to perceive that it is present (as with most other refrigerants). Propane is often used as a fuel, such as for heating or barbecues. However, for use on refrigeration systems, fuel-grade propane is not suitable since it contains high levels of impurities, which would damage the refrigeration system and may not provide the desired refrigerating capacity or efficiency.

HC R-290 refrigerant has a high grade of purity. Propane as a cooking gas is not useful for refrigeration purpose!

The structural formula of HC R-290 (propane)

Important refrigerant properties and parameters:

Molecular formula

C3H8

Melting point [°C]

-188

Boiling point under atmospheric pressure [°C] -1

-42

Molar mass [g mol ]

44.10

Critical temperature [°C]

96.8

Critical pressure [bar]

42

3

Practical limit [g/m ]

8

Lower flammability level LFL [g/m3 ]

38

Lower flammability level LFL [%]

2.1 3

Read More! Guidlines for the safe use of hydrocarbon refrigerants

Upper flammability level UFL [g/m ]

171

Upper flammability level UFL [%]

9.5

GIZ—PROKLIMA

Ignition temperature [°C]

470

http://www.giz.de/ proklima

GREE Service Manual GWC09AA / K5NNA6A

Page 38

Flammability Three components are needed simultaneously for causing fire: 1. 2. 3.

Oxygen Ignition source and The flammable concentration of HC

For ignition, the concentration of HC in air has to be between the lower and upper flammable limits. If the concentration is below the lower flammability limit (LFL) of about 2% by volume in air, there is not enough HC for combustion. If the concentration is above the upper flammability limit (UFL) of about 10% there is insufficient oxygen for combustion. Oxygen 0 % to 100 %

2%

10 %

HC R-290 Refrigerant

By way of illustration please compare to the schematic view:

Possible ignition sources are:

To ignite HC R290, three (3) components must exist at the same time at work area to cause the refrigerant burning!

1. A flame, for example from brazing torch, halide torch leak lamp, match or lighter, cigarette 2. A spark from an electrical component 3. Static electricity 4. Hot surfaces

Safety data Hazard Identification • Extremely flammable (F+). • Readily forms an explosive air-vapour mixture at ambient temperatures. • Vapour is heavier than air and may travel to remote sources of ignition

(e.g. along drainage systems, into basements etc). • Liquid releases generate large volumes of flammable vapour (approx.

250:1) • Cold burns (frostbite) will result from skin / eye contact with liquid.

1 kg of liquid HC R-290 refrigerant creates about 250 litres of gas

• Liquid release or vapour pressure jets present a risk of serious damage to

the eyes. • Abuse involving inhalation of high concentrations of vapour, even for short

periods, can produce unconsciousness or may prove fatal. Inhalation may cause irritation to the nose and throat, headache, nausea, vomiting, dizziness and drowsiness. In poorly ventilated areas unconsciousness or asphyxiation may result.

GREE Service Manual GWC09AA / K5NNA6A

Beside the flammability, most other safety properties are similar to other refrigerants! Rely always on best service practices in refrigeration! Page 39

First Aid Measures Inhalation: Remove the affected person to fresh air. If breathing has stopped, administer artificial respiration. Give external cardiac massage if necessary. If the person is breathing but unconscious, place them in the recovery position. Obtain medical assistance immediately. Skin: In case of cold burns: flush with water to normalize temperature. Cover the burns with sterile dressings Do not use ointments or powders. Obtain medical assistance immediately. Eyes: Cold burns should be flushed with water to normalise temperature, cover the eye with a sterile dressing and obtain medical assistance immediately.

GREE Service Manual GWC09AA / K5NNA6A

Page 40

Fire Fighting Measures HC R-290 is delivered, stored, and used at temperatures above their flash point. Avoid all naked flames, sparks, cigarettes, etc. • In case of fire, immediately alert fire brigade • Ensure an escape path is always available from any fire • If gas has ignited do not attempt to extinguish but stop gas flow and allow

to burn out. • Use water spray to cool heat-exposed containers, and to protect surround-

ing areas and personnel effecting the shut off • Every precaution must be taken to keep containers cool to avoid the possibility of a boiling liquid expanding vapour explosion (BLEVE) Extinguishing Media: In case of a large fire: Release must be stopped and container cooled by water spray. Water mist should be used to assist approach to the source of the fire. Large fires should only be handled by Fire Brigade. DO NOT USE WATER JET Small fire: Use dry powder extinguisher DO NOT USE WATER OR FOAM Special protective equipment for fire fighters: In confined spaces use self-contained breathing apparatus Hazardous combustion products: Incomplete combustion may form carbon monoxide. Accidental Release Measures Immediate emergency action: • Clear people away from the area to a safe place • Do not operate electrical equipment unless “Ex”-rated • Summon the emergency services • Treat or refer casualties if necessary Further actions: • Stop release • Use dry powder or carbon dioxide extinguishers • Cool containers exposed to fire by using water / mist spray. Further action (when release is made safe): • Extinguish all naked lights – avoid creating sparks • Position fire fighting equipment • Cover drains and disperse vapour with water spray. Note: vapour may collect in confined spaces.

GREE Service Manual GWC09AA / K5NNA6A

Page 41

The handling of HC R-290 Due to the flammability of R-290 and the risk of fire or explosion during servicing, special safety rules must be followed during operation. In order to avoid damage for people and property, particular requirements are listed hereafter. Before servicing the unit, the surrounding area were the work will be done must be clear of safety hazards to ensure safe working. Nevertheless it is required to carry out a risk assessment in order to minimise the risk of ignition of R-290. The following safety measures must be followed: 1. Any employees and other present persons must be informed about the service and the way the service is done, first. 2. It is recommended to isolate the working environment in order to keep out any unauthorised personnel. 3. It is useful to set up signs such as “no smoking“ or “access denied“. 4. It is prohibited to store any combustible goods within the working environment. 5. Within two (2) metres radius, ignition sources are not allowed in the working area. 6. Fire extinguisher (dry powder) must be easily accessible at any time. 7. During service work, proper ventilation of the environment must be ensured.

The HC leak detector is indeed a Personal Protective Equipment (PPE) device!

Sign plate to protect and mark the working area Appropriate detectors, suitable for hydrocarbons, must be available and operational all the time. Appropriate tools and appliances must be available and ready for operation. Any employees need to be instructed extensively about the safety measures and the possible safety hazard. GREE Service Manual GWC09AA / K5NNA6A

Page 42

Refrigerant recovery Before starting service work on the refrigerant circuit, the existing refrigerant must be removed. When carrying out removal of the refrigerant, the following must be considered: • The recovery cylinder must be permitted for the use of R-290 (especially

• •

• • •

• • • •

regarding the pressure and the compatibility of the connectors and the valves). The recovery machine must be suitable for operation with R-290. Importantly, the recovery machine must not itself be an ignition source. The filling of the recovery cylinder should be monitored closely by controlling the weight. It is recommended to place and then to leave the cylinder on a digital scale. Pay attention not to overfill the cylinder. The cylinder is only allowed to be filled up to 80% of its complete volume by liquid refrigerant. The pressure must be controlled in order to ensure that the permissible pressure of the cylinder is not exceeded at any time. After filling, the cylinder must be marked with the mass and the type of refrigerant recovered. The recovery machine should be operated until the pressure reduces to 0.3 bar absolute pressure. R-290 is soluble to oil. This may lead to a rise in pressure because the refrigerant vaporises from oil. It may be necessary to operate the recovery machine for a second or even a third time. Small amounts of R-290 can be vented in safe manner to the environment. Remaining amounts of HC absorbed by the oil can be extracted from the system using a vacuum pump in combination with an exhaust vent hose. A second “two way excess” recovery cylinder can be used in serial connection to act as an oil-separator. After the systems‘ pump out, the system should be flushed with oxygenfree dry nitrogen (OFDN) in order to ensure no flammable gas are inside the system.

GREE Service Manual GWC09AA / K5NNA6A

Page 43

Repair of leaks System leaks must be immediately repaired by authorised personnel after becoming acquainted. If they cannot be repaired immediately, the refrigerant charge should be removed from the system until the point at which the leak can be properly repaired. Repairs must be done principally using the following procedures: • Removing the refrigerant from the system in order to avoid an uncontrolled

discharge. • Examine the leak source, determining the reason for the leak and carry

out the proper course of action • Repair properly (NO “temporary repairing”) • Based on the results of the systems’ examination, suitable measures need

to be identified in order to avoid a recurrent appearance of the leak. • Before embarking on the repair, ensure that the refrigerant has been re-

moved and the system flushed with OFDN, especially if brazing is to take place • After each intervention into a refrigeration system (repairing leaks, replac-

ing components, brazing) the system must be subject to a leak test and following strength test of the system.

Regular professional brazing experience is an important precondition for the work with hydrocarbon refrigerants! The use OFDN is an important precondition for professional leak repair! 1. System flushing from HC 2. Inert gas brazing 3. Leak testing 4. Strength testing 5. Cleaning (blowing) agent

GREE Service Manual GWC09AA / K5NNA6A

Page 44

Gas detection While servicing the unit it is recommended for the whole period of work — before, during and after — to monitor the gas concentration in the air within the work environment. By monitoring the air within the work environment the danger of a possible formation of flammable atmosphere can be detected early.

The HC leak detector is indeed a PPE device!

During the monitoring, ensure that the gas detectors are suitable for hydrocarbon detection. Never use open fire or a device with an ignition source for the detection of gas or for leak detection. Before operation of the gas detector the instruction manual must be read carefully. In case of any questions refer to the detector manufacturer. Furthermore ensure the detector is correctly calibrated. Instructions for calibration can be found in the instruction manual of the detector or upon request from the manufacturer. A possible re-calibration must be done within an area which is free of refrigerants. In case of a positive detection by the detector any work must be stopped immediately. Any open flames or ignition sources must be extinguished or removed. In addition to a suitable and approved HC gas detectors, portable gas detectors can be used. Such a detector can be clipped to clothing or placed on the floor within the working area. It should be switched on for the duration of the work, and set to alarm at 15% of the lower flammability level (LFL), to warn that flammable concentration may be nearby. In this way, technicians can be alerted whenever an inadvertent release of flammable refrigerant occurs, and can immediately act upon the relevant emergency procedures.

Portable HC Gas Detector

GREE Service Manual GWC09AA / K5NNA6A

Page 45

Cylinder handling R-290 is available in a large variety of different cylinders, which are to be distinguished whether they are refillable or not. Most refillable cylinders are equipped with pressure relief valves, often with own special construction of valves in order to distinguish them from the cylinders of different refrigerants. Often special legal requirements about the handling of flammable refrigerants exist in the different countries. These requirements must be studied and adhered to. Principally the following regulations in dealing with R-290 cylinders apply: 1. 2. 3. 4. 5.

Do not remove or destroy official stickers of the cylinder Close the cylinder with a cap any time the cylinder is not used Never expose the cylinder to direct heat Do not repair or modify the cylinder or the cylinders‘ connections Only use suitable equipment for transportation of the cylinder, even for short distances. Never roll the cylinder across the ground. 6. Take appropriate measures in order to prevent impurities, water or oil from entering the cylinder. 7. Should it be necessary to warm the cylinder, only use warm water or air in which the temperature must not exceed 40°C (104°F). Open flames or radiant heaters are not allowed at any time. 8. Weigh the cylinder and compare it against the tare weight (normally stamped on the cylinder) in order to make sure that it is empty. Pressure control is no secure method to find out if and how much refrigerant there is inside the cylinder. 9. For accurate charging, use a set of reliable scales with appropriate resolution (depending on the size of system charged with refrigerant) and use the smallest size of cylinder available. 10. For recovery of R-290, only use cylinders which are allowed to be filled with R-290. 11. Make sure that safety inspections are still valid (i.e. within date), specifically with regards to safety test certification. 12. For refillable recovery cylinders keep in mind that with recovered amounts of HC refrigerant, oil will always be present specific amounts may remain in the cylinder after emptying.

Charging HC! Always use the smallest cylinder possible and relay on appropriate accurate and sensitive scales

The storage of R-290 cylinders is controlled by regulations. These regulations take priority over the present guidelines. Typically, such rules imply the following: 1.

Cylinders should be stored in a separate area, preferably outside, otherwise in a dry, well ventilated place far away from any ignition source. 2. Admission to storage area must only be given to authorised personnel. Storage areas must be labelled with “no smoking” and “no naked flames” signs. 3. Storage areas should be at ground level and never in the basement. 4. Access should be easy – exclude any obstacles. 5. Cylinders should be stored and operated only in an upright position. 6. Choose appropriate measures to prevent static charges 7. Please remember that the maximum quantity of stored refrigerant sometimes might be regulated by national regulations. The transport of cylinders is controlled by laws in most countries. These laws must always be regarded first before the mentioned guidelines here. In many cases information about regulations for the transport of cylinders could be given by the dealer of the refrigerant. GREE Service Manual GWC09AA / K5NNA6A

Read More! Guidlines for the safe use of hydrocarbon refrigerants GIZ—PROKLIMA http://www.giz.de/ proklima

Page 46

Basically the following must be regarded concerning the transport of R-290 cylinders: 1. During the transportation of R-290 always carry along printed information about the refrigerant. In case of emergency these information must be easily accessible. There are often different demands to the transporters carrying a great quantity of gas. Inform yourself before the scheduled transport. 2. Make yourself familiar with the risks of the refrigerant and the emergency measures in case of accident or emergency. 3. Always carry a fire extinguisher during transportation with you. It should be a dry powder fire extinguisher with a capacity of at least of 2 kg. Make sure that the driver is experienced in fire extinguisher operation. 4. Cylinders must be transported in an upright position and be tightly secured. 5. Make sure of a proper ventilation inside the van even though it might request a change in the vans‘ body construction. 6. Place the security advise “flammable gas“ upon the rear side of the van. 7. Smoking or open fire is strictly forbidden inside the van. 8. Do not leave cylinders in a locked van without surveillance longer than necessary.

GREE Service Manual GWC09AA / K5NNA6A

Page 47

Pressure—Temperature Chart

HC Refrigerant R-290 Temperature

Absolute pressure

Gauge pressure

°C

°F

kPa

bar

PSI

kPa(g)

bar(g)

PSI(g)

-40

-40

111,12

1,11

16,12

11,12

0,11

1,61

-39

-38,2

116,00

1,16

16,83

16,00

0,16

2,32

-38

-36,4

121,05

1,21

17,56

21,05

0,21

3,05

-37

-34,6

126,27

1,26

18,31

26,27

0,26

3,81

-36

-32,8

131,66

1,32

19,10

31,66

0,32

4,59

-35

-31

137,23

1,37

19,90

37,23

0,37

5,40

-34

-29,2

142,97

1,43

20,74

42,97

0,43

6,23

-33

-27,4

148,90

1,49

21,60

48,90

0,49

7,09

-32

-25,6

155,02

1,55

22,48

55,02

0,55

7,98

-31

-23,8

161,33

1,61

23,40

61,33

0,61

8,89

-30

-22

167,83

1,68

24,34

67,83

0,68

9,84

-29

-20,2

174,54

1,75

25,31

74,54

0,75

10,81

-28

-18,4

181,44

1,81

26,32

81,44

0,81

11,81

-27

-16,6

188,56

1,89

27,35

88,56

0,89

12,84

-26

-14,8

195,89

1,96

28,41

95,89

0,96

13,91

-25

-13

203,43

2,03

29,51

103,43

1,03

15,00

-24

-11,2

211,19

2,11

30,63

111,19

1,11

16,13

-23

-9,4

219,18

2,19

31,79

119,18

1,19

17,29

-22

-7,6

227,39

2,27

32,98

127,39

1,27

18,48

-21

-5,8

235,84

2,36

34,21

135,84

1,36

19,70

-20

-4

244,52

2,45

35,46

144,52

1,45

20,96

-19

-2,2

253,44

2,53

36,76

153,44

1,53

22,26

-18

-0,4

262,61

2,63

38,09

162,61

1,63

23,58

-17

1,4

272,03

2,72

39,45

172,03

1,72

24,95

-16

3,2

281,70

2,82

40,86

181,70

1,82

26,35

-15

5

291,62

2,92

42,30

191,62

1,92

27,79

-14

6,8

301,81

3,02

43,78

201,81

2,02

29,27

-13

8,6

312,27

3,12

45,29

212,27

2,12

30,79

-12

10,4

323,00

3,23

46,85

223,00

2,23

32,34

-11

12,2

334,00

3,34

48,44

234,00

2,34

33,94

-10

14

345,28

3,45

50,08

245,28

2,45

35,58

-9

15,8

356,85

3,57

51,76

256,85

2,57

37,25

-8

17,6

368,70

3,69

53,48

268,70

2,69

38,97

-7

19,4

380,85

3,81

55,24

280,85

2,81

40,73

-6

21,2

393,29

3,93

57,04

293,29

2,93

42,54

-5

23

406,04

4,06

58,89

306,04

3,06

44,39

GREE Service Manual GWC09AA / K5NNA6A

Page 48

HC Refrigerant R-290 Temperature

Absolute pressure

Gauge pressure

°C

°F

kPa

bar

PSI

kPa(g)

bar(g)

PSI(g)

-4

24,8

419,09

4,19

60,78

319,09

3,19

46,28

-3

26,6

432,45

4,32

62,72

332,45

3,32

48,22

-2

28,4

446,13

4,46

64,71

346,13

3,46

50,20

-1

30,2

460,13

4,60

66,74

360,13

3,60

52,23

0

32

474,46

4,74

68,82

374,46

3,74

54,31

1

33,8

489,11

4,89

70,94

389,11

3,89

56,44

2

35,6

504,10

5,04

73,11

404,10

4,04

58,61

3

37,4

519,43

5,19

75,34

419,43

4,19

60,83

4

39,2

535,10

5,35

77,61

435,10

4,35

63,11

5

41

551,12

5,51

79,93

451,12

4,51

65,43

6

42,8

567,49

5,67

82,31

467,49

4,67

67,80

7

44,6

584,22

5,84

84,74

484,22

4,84

70,23

8

46,4

601,31

6,01

87,21

501,31

5,01

72,71

9

48,2

618,77

6,19

89,75

518,77

5,19

75,24

10

50

636,60

6,37

92,33

536,60

5,37

77,83

11

51,8

654,81

6,55

94,97

554,81

5,55

80,47

12

53,6

673,40

6,73

97,67

573,40

5,73

83,17

13

55,4

692,38

6,92

100,42

592,38

5,92

85,92

14

57,2

711,75

7,12

103,23

611,75

6,12

88,73

15

59

731,51

7,32

106,10

631,51

6,32

91,59

16

60,8

751,68

7,52

109,02

651,68

6,52

94,52

17

62,6

772,25

7,72

112,01

672,25

6,72

97,50

18

64,4

793,24

7,93

115,05

693,24

6,93

100,55

19

66,2

814,64

8,15

118,16

714,64

7,15

103,65

20

68

836,46

8,36

121,32

736,46

7,36

106,82

21

69,8

858,71

8,59

124,55

758,71

7,59

110,04

22

71,6

881,39

8,81

127,84

781,39

7,81

113,33

23

73,4

904,51

9,05

131,19

804,51

8,05

116,69

24

75,2

928,07

9,28

134,61

828,07

8,28

120,10

25

77

952,07

9,52

138,09

852,07

8,52

123,58

26

78,8

976,53

9,77

141,64

876,53

8,77

127,13

27

80,6

1001,45

10,01

145,25

901,45

9,01

130,75

28

82,4

1026,83

10,27

148,93

926,83

9,27

134,43

29

84,2

1052,68

10,53

152,68

952,68

9,53

138,18

30

86

1079,00

10,79

156,50

979,00

9,79

141,99

31

87,8

1105,79

11,06

160,38

1005,79

10,06

145,88

GREE Service Manual GWC09AA / K5NNA6A

Page 49

HC Refrigerant R-290 Temperature

Absolute pressure

Gauge pressure

°C

°F

kPa

bar

PSI

kPa(g)

bar(g)

PSI(g)

32

89,6

1133,08

11,33

164,34

1033,08

10,33

149,84

33

91,4

1160,85

11,61

168,37

1060,85

10,61

153,87

34

93,2

1189,12

11,89

172,47

1089,12

10,89

157,97

35

95

1217,88

12,18

176,64

1117,88

11,18

162,14

36

96,8

1247,16

12,47

180,89

1147,16

11,47

166,38

37

98,6

1276,94

12,77

185,21

1176,94

11,77

170,70

38

100,4

1307,24

13,07

189,60

1207,24

12,07

175,10

39

102,2

1338,07

13,38

194,07

1238,07

12,38

179,57

40

104

1369,42

13,69

198,62

1269,42

12,69

184,12

41

105,8

1401,31

14,01

203,25

1301,31

13,01

188,74

42

107,6

1433,73

14,34

207,95

1333,73

13,34

193,44

43

109,4

1466,71

14,67

212,73

1366,71

13,67

198,23

44

111,2

1500,23

15,00

217,59

1400,23

14,00

203,09

45

113

1534,31

15,34

222,54

1434,31

14,34

208,03

46

114,8

1568,96

15,69

227,56

1468,96

14,69

213,06

47

116,6

1604,18

16,04

232,67

1504,18

15,04

218,17

48

118,4

1639,97

16,40

237,86

1539,97

15,40

223,36

49

120,2

1676,34

16,76

243,14

1576,34

15,76

228,63

50

122

1713,30

17,13

248,50

1613,30

16,13

233,99

51

123,8

1750,86

17,51

253,94

1650,86

16,51

239,44

52

125,6

1789,02

17,89

259,48

1689,02

16,89

244,98

53

127,4

1827,79

18,28

265,10

1727,79

17,28

250,60

54

129,2

1867,17

18,67

270,81

1767,17

17,67

256,31

55

131

1907,17

19,07

276,62

1807,17

18,07

262,11

56

132,8

1947,80

19,48

282,51

1847,80

18,48

268,01

57

134,6

1989,07

19,89

288,49

1889,07

18,89

273,99

58

136,4

2030,98

20,31

294,57

1930,98

19,31

280,07

59

138,2

2073,54

20,74

300,75

1973,54

19,74

286,24

60

140

2116,75

21,17

307,01

2016,75

20,17

292,51

GREE Service Manual GWC09AA / K5NNA6A

Page 50

Flow of Work for AC– System Installation, Service, Repair and Dismantling The main concern for involved service personal is to avoid the release of any refrigerant during installation, maintenance, repair and service of the HC R-290 air-conditioning system. The following chart shall highlight important work flow activities and where specific care should take place!

GREE Service Manual GWC09AA / K5NNA6A

Page 51

Installation Important Notes The installation of the system is only permitted by trained personnel strictly following the local country rules and regarding the guidelines of this manual. Please refer to a local authorised service centre before installation. The same applies when removing an existing and installed system to another place.

Delivery conditions of Indoor and Outdoor Unit The system components are delivered in a pre-installed condition. With delivery, the two main components (indoor– and outdoor-unit) are pressurised and contain the complete HC R-290 refrigerant charge amount of the functional AC system. For installation, besides mounting the indoor and the outdoor unit, it is only necessary to make the connection between the two units with the already installed and pressurised refrigerant transfer pipes and electrical connection cabling. The HC R-290 AC delivery package consist of the following components: The Indoor Unit with attachments, mounting support, remote controller and documentation

All components are pressurised and precharged with HC R-290 refrigerant!

The Outdoor Unit

GREE Service Manual GWC09AA / K5NNA6A

Page 52

Principle Installation Arrangement

7 9 5

3

8

1

Indoor Unit 6 2 6

4

Outdoor Unit

1

Condensing unit

2

Condenser fan and air outlet

3

Refrigerant piping and electrical cable (pre assembled)

4

Drain pipe

5

Indoor (wallmounted) unit

6

Quick coupler for refrigerant transfer tube connections

7

Air Inlet evaporator

8

Air outlet evaporator

9

Shadow zone for outdoor unit installation

GREE Service Manual GWC09AA / K5NNA6A

Page 53

Tools, equipment and accessories The following list is a description of the tools needed for installation. This list only mentions the minimum tools required for works including maintenance and service to the units. Number Item

Detailed list of tools and equipment including references and pictures, see page 130

Remarks

1

Toolbox

For sorting and storage of tools

2

Spirit level

To make sure that the mounting plate is installed horizontally

3

Safety gloves

For safe handling of the refrigerant and to protect the hands

4

Safety goggles

In order to protect the eyes

5

Drill

To drill holes during installation

6

Hammer, 300 gr.

For fixation of dowels

7

Measuring tape, 2 m

For measuring

8

Cable knife

To cut wires and adhesive tape

9

Set of screw drivers

To tighten the screws and the electrical wires

10

Set of electric pliers

To maintain electrical works

11

Combination wrenches set

Used for connecting the nuts.

12

1 adjustable wrenches

Used for connecting the valve’s nuts and the pipe set.

13

1 torque wrench (200 Nm)

For tightening of the pipe set quick couplers

14

Allen key

To open and to close the stop valves at the outdoor unit

15

Leak detector (HC R290)

To detect gas leaks and for the use as PPE

16

Gauge set (HC R290)

To test and to check the system pressure after installation

17

Refrigerant hoses with ball valves

Gauge set connection and refrigerant transfer

18

Clamp-on meter

Test voltage, resistant and current.

19

Locking pliers

Sealing

20

Brazing unit, propane / oxygen

Brazing

21

20 Litre OFDN cylinder

Leak test, strength test, system flushing - 300/200 bar

22

OFDN pressure regulator

Cylinder pressure 0-315/200bar, working pressure 0-60/40 bar

23

Soap water solution and brush

Leak test

24

Portable thermometer

To measure air and contact temperatures

25

Two pin voltage tester

To measure and test voltage

26

Two stage rotary vacuum pump

To evacuate the AC system (rest removal of HC refrigerant)

27

Electronic vacuum gauge

AC system charging with refrigerant

28

HC R-290 refrigerant cylinder

Safe transport of refrigerant

29

Weighting scales

Reliable and accurate charge of HC R-290 refrigerant

GREE Service Manual GWC09AA / K5NNA6A

Page 54

Security advise for installation During the installation activities, the installation site and the place of mounting needs to be ventilated well. No unauthorised person should enter the installation area during installation activities

For this specific AC unit, the indoor room size should be at a minimum of 7 m² !

Do not close the doors or windows! Do not use open fire, especially cigarettes, no brazing units or open cooking during installation. Avoid static charge by wearing cotton clothes and cotton safety gloves. Place the leak detector (or HC gas alerter/detector) operational in the installation area! If there appears a leak within the refrigerant circuit increase the air ventilation at the installation side. Stop any work immediately and switch off the electrical power supply. If damage occurs to the system during installation refer to the local service centre. Switch off cell phones during installation. Take care that any other electric devices such as TVs, microwave ovens are switched off during installation. For installation, service and repair always provide a dry powder fire extinguisher within the work area.

Before installation The system contains exactly 200 grams of HC R-290 refrigerant charge. For security reasons the room for the installation of the indoor unit must have a minimum of room size. This is set to the system of GWH09AA-K5NNA6A at 7 m2 minimum with 1.8 metre installation height. Refer to the room size selection table on the following page. Assure yourself about the admissible minimum amount of room area before installation! Before you unpack the system from the transport box, keep the HC leak detector ready. Open up the transport box and produce only a small hole first into the foil in which the system is shrink-wrapped. Place the gas detector inside the wrapping and make sure that the detector does not identify the presence of any gas. Should there be a gas detection refer immediately to the local service centre in order to organise a replacement system. Now unwrap the components. Examine the delivered parts for damages.

GREE Service Manual GWC09AA / K5NNA6A

Page 55

Table of various installation height and resulting room size. Installation height in meter Minimum room size in m2 HC R-290 Refrigerant Charge 0,200 kg 1,80 7,0 1,85 6,6 1,90 6,3 1,95 6,0 2,00 5,7 2,05 5,4 2,10 5,2 2,15 4,9 2,20 4,7 2,25 4,5 2,30 4,3 2,35 4,1 2,40 3,9 2,45 3,8 2,50 3,6 2,55 3,5 2,60 3,4 2,65 3,2 2,70 3,1 2,75 3,0 2,80 2,9 2,85 2,8 2,90

2,7

2,95 3,00

2,6 2,5

European standard EN378-1 International Standard IEC 60335-2-40

The Installation Site - general information The system should not be mounted at the following sites because of the existing danger of outer influences for a risk of malfunction or failure. In cases when installation to these sites is unavoidable, first contact the GREE Co. service partner. 1. Places with strong heat sources, combustible gases, vapours or volatiles 2. Places evoking high frequency waves, e.g. by radio equipment, medical or welding equipment 3. Places with an unusually high salt content in the air 4. Places with oil containing air 5. Places next to hot sources or geysers because of sulphite gases could be dissolved in the air 6. Any other places with specific but comparable conditions to those mentioned above. In case of any doubts refer to the manufacturer or to an authorised service centre.

GREE Service Manual GWC09AA / K5NNA6A

Page 56

The installation site – outdoor unit 1. Choose the installation location in a way that noise from the system or outgoing air from the system neither jeopardises nor bothers neighbours, animals or vegetation. 2. Make sure to choose an installation location which has free airflow (sufficient air volume) and is dry. Avoid direct sunlight or locations which are subject to strong winds. 3. Make sure that walls can stand the weight of the unit and can handle the associated vibration. 4. Consider the dimensions diagram (see page 58) during installation in order to achieve good accessibility for maintenance and services and to reduce the risk for material assets. 5. Mount the unit out of the reach of children. 6. Make sure that walkways are not blocked and that there are no negative influences to the skyline. 7. In case of any doubts refer to the responsible authority in the country where the installation is done. 8. In some countries special laws and restrictions for the mounting of split air conditioning units may apply. The installation site – indoor unit Choose an installation site according to the dimensions (see page 58) diagram. 1. Make sure that condensate can flow out easily. 2. Keep in mind that the pre-installed pipe-set is exactly 5 m and no modifications are permitted (to shorten or to lengthen the refrigerant tubes) and that connections to the outdoor unit are easy to be set up. 3. Easy access to the indoor unit must be ensured for maintenance and servicing purposes such as a change of the filters. 4. The indoor unit should be mounted out of the reach of children. 5. Make sure that the installation position of the indoor unit can handle the weight of the unit and the associated vibration. At best no additional noise pollution should be generated. 6. Keep the unit away from heat sources, flammable and explosive materials. 7. The air inlet and outlet vent should not be obstructed, make sure that the air can be blown throughout the entire room. 8. There shall be no electric appliance, power switch or socket under the indoor unit. 9. There should be a minimum distance of about 1 m from TV-sets or any other electric appliances.

GREE Service Manual GWC09AA / K5NNA6A

Modification of refrigerant transfer pipes is not permitted!

Page 57

Installation Dimension Diagram

GREE Service Manual GWC09AA / K5NNA6A

Page 58

Installation Check List Carefully asses the local conditions and consider that all safety measures are in place. Check the needs for installation in order to arrange a smooth and uninterrupted work flow. Remember, if you cannot work safe with HC refrigerants, don't do it! In general, the GREE Hydrocarbon R-290 AC– Split System must be set up and configured to original factory specifications and tolerances!

No Precondition for Installation 1

Installation / Service person/s is qualified

2

Installation / Service person/s carefully read and understood this manual

3

The room size is no smaller than the limit in this manual (min 7 m²)

4

Walls can handle the installation of indoor and outdoor unit

5

No disruption to the environment

6

There is no damage or leakage at the new AC components

7

The set of AC components is complete

8

Installation tools and equipment is prepared and in place

9

Power connection (socket) at the right place

10

Electrical installation is safe and according the local requirements

11

Installation area is well ventilated

12

There are no sources of ignition within the range of two metres

13

Warning signs are placed

14

Fire extinguisher is present

15

Other persons in the area are informed about the activities

16

Mobile phone is switched off

17

Power socket of installation tools are more than two metres away

18

HC leak detector is placed and in operation

GREE Service Manual GWC09AA / K5NNA6A

Remarks

Yes / No

Page 59

Safety measures concerning electrical equipment 1. Electrical operations and installations are only allowed to be done by an authorised professional person according the local requirements and directives. Connect the air-conditioning system to a separate fused circuit. 2. Do not strongly pull the electric wires. 3. Any parts of the system must be integrated in effective equipotential bonding conductor connection. The unit needs to be secured against short circuit and overload. 4. Ensure a safe distance of at least 1.5 m to combustible materials. 5. Make sure any electric wires (live wire, neutral wire, protection earth wire) are installed to their specific function. 6. The wrong wiring leads to fire or damage of the system or even to an overheating of the wires.

Check the provided wiring diagram and verify with the installed AC– unit!

Requirements for earthing 1. The system must be equipped with an effective equipotential bonding conductor connection. 2. The yellow-green wire is the earth wire and must not be used for other purposes at all. It is not allowed to cut the wire or to fix the wire with screws. Otherwise the risk of electric hazard increases. 3. Equipotential bonding / protection earthing must be done whilst obeying the local rules and regulations. 4. The earthing resistance must not exceed 4 Ohms. Otherwise an operation with combustible refrigerants is not allowed. 5. The connection to the circuit must be equipped with an earthing connection. Do not connect the earthing wire to water- or gas pipes or to other devices which would be pointed out as unsuitable by authorised personnel. 6. Earthing wires are not allowed to be switched. The earthing must be connected to the wall plug of the unit.

Miscellaneous 1. The wiring diagram of the required circuit wiring must be consulted during the connection of any kind of wires. 2. Before installation of the system ensure that existing laws and regulations of the local country regarding the wiring of air-conditioning systems and earthing are known. These rules and regulations are mandatory during installation. 3. The system is only for the operation done by children or persons with limited physical, sensory or mental abilities and persons who do not posses the required skills or experience. This group of people need to be supervised by a responsible person if the system is operated by these people. 4. The system is not a toy. Give advice to the end-user of no uncontrolled playing of children in order to avoid misuse of the system.

GREE Service Manual GWC09AA / K5NNA6A

Page 60

Procedure of the installation of the system The following basic procedures must be observed for installation of the system: 1. Read the specifications of the system and make sure that you understood them. 2. Make sure that the installation site meets the requirements. 3. Check the tools and equipment, especially concerning the suitability with R-290. 4. Accomplish the proper connection of the system. 5. Check the integrity of the system and check all the functions. 6. Hand over the end user manual to the client and instruct the operator about the basic functions of the system. 7. Fill in and sign the commissioning report (Start-up data sheet) provided on page 70 of this manual.

Installation of the indoor unit After choosing a reliable installation site and a controlled check of the tools for mounting the system, start mounting the indoor unit. The Mounting Plate Install the mounting plate where the indoor unit will be placed. Place the mounting plate horizontally, ensuring there is still a slight tilt in order to

make sure that condensate will run out unimpeded from the indoor unit. Drill the holes and then fix the mounting plate by using dowels and screws. Pay attention to the way the wall is constructed at the chosen installation site. Make sure that the chosen screws and dowels are able to carry the weight of the indoor unit. During drilling be aware of the possibility of existing supply piping such as water pipes or electrical wires. Make sure not to tighten the screws directly. Align the installation plate with a slight tilt only then tighten the screws. Be mindful of a strong and even contact with the installation plate to the wall. In doing so, vibrations and sound transmission is avoided. Furthermore, pay attention to equal the weight distribution of the indoor unit to all screws. GREE Service Manual GWC09AA / K5NNA6A

Page 61

Installation of connection pipes and cables In order to connect the indoor and outdoor unit the connection pipes and cables (preinstalled and fixed to the indoor unit) need to be installed through the wall. Drill a wall duct of a diameter of at least 85 mm, with a slight descent through the wall of approximately 5% to the outside. The hole must admit the refrigerant connection pipes, cables and condensate tube. All lines are covered with a common protective shell. Since the connection lines have a length of 5 m the lead through should be executed with the assistance of another person.

Indoor unit installation requires the assistance of another person!

Mounting of the condensate pipe Make sure that the condensate pipe is always mounted with a natural descent to the outside, 5% descent is recommended. Furthermore make sure that the condensate pipe is neither bent nor kinked. Both – bent and kinked – could obstruct the correct flow of the condensate. If it is not possible to realise, a descent, condensate pump must be installed. If condensate is drained to the sewerage the condensate pipe must be equipped with a siphon in order to prevent a noise pollution or any other nuisance. In case the outdoor unit is operated at low ambient temperatures or if the pipe may be subjected to ambient temperatures below 0ºC, condensate pipe must be protected against icing. The condensate pipe must be isolated against water from condensation. If condensate is drained to a storage container, the container must not be sealed. Otherwise back pressure will rise up and will therefore obstruct the correct flow of the condensate. The end of the condensate pipe must not touch the maximum level of the condensate inside the container. After installation the condensate pipe must be checked for density by testing the pipe with rinsing water.

GREE Service Manual GWC09AA / K5NNA6A

Page 62

1. Connect the condensate pipe to the nozzle of the indoor unit. The connection must be fixed with adhesive tape. 2. Insert the condensing pipe into the piping-hole sleeve. 3. Lag the piping-hole sleeve with a wide adhesive tape in order to prevent it from moving. 4. Move the piping-hole sleeve together with the condensate pipe through the wall duct.

GREE Service Manual GWC09AA / K5NNA6A

Page 63

Running of connection pipe set Refrigerant transfer pipes (liquid and gaseous refrigerant pipes) and the connection cables for indoor and outdoor units are bundled to one common pipe set permanently connected to the indoor unit.

The unit is an INTRINSIC SAFE system! Refrigerant charge is limited to 200 gram Top-up of charge is not permitted Modification of pipe-length is not permitted

The pipe set and the drain hose could be taken out of the indoor unit on the right and on the left side, as well as on the backside left, on the backside right. 1. If you want to lead the main power cable with socket from the right or from the left side cut off the tailings 1 on the operational side, 2. Cut off tailing 2 if you want to lead out both the main power cable, the indoor to outdoor connection wires and the refrigerant piping.

Hang up the indoor unit to the mounting plate and make sure that it is fixed tightly. After checking the installation, close the cable channel, which is located inside the wall by using operational resources such as plaster or mortar.

GREE Service Manual GWC09AA / K5NNA6A

Page 64

Installation of the outdoor unit Consider the above-mentioned selection criteria when choosing the installation site and refer to the installation diagram because of the minimum distances to be kept for installation. Mount the unit to solid ground, fix it securely and free of any vibration. Possibly use a shock absorbing substructure, such as a mounting bar. For mounting the unit up to wall brackets, use specific heavy duty dowels (and special screws) in accordance to the consistency of the wall. Use vibration dampers to prevent a transmission of oscillations and vibrations from the unit to the wall. Make sure to mount the outdoor unit with a maximum descent not exceeding 3°. In any case make sure – when there is an unavoidable descent – that the compressor is not located inside the deeper laying part of the unit. The distance of the outdoor unit to the wall shall not be less than 300 mm. Keep in mind that no exhaust air (warm air) from other installations shall enter the outdoor unit. Furthermore make sure that the outdoor unit is mounted tightly enough in order to resist strong winds. In areas with a large amount of snow it is recommended to place a roof above the outdoor unit.

GREE Service Manual GWC09AA / K5NNA6A

Page 65

Interconnection of indoor and outdoor unit Consider the following remarks when interconnecting the functional pipe set: Install the functional pipe set carefully and protect it against movement. Make sure on behalf of the construction side that no tractive forces can arise. Under no circumstances shall the piping by modified. The wires must be connected correctly. A wrong connection could lead to damages of the system. A wrong connection of the earthing wire could lead to serious health damage caused by electric shock. Connect the wires securely and reliably. Check the stability of the connection. Check wire screws in case of loosening during transport. Avoid any damage to the wiring.

Modification of refrigerant transfer pipes is not permitted!

Make sure that the plate of the housing and the connections are tightly closed. This needs to be done in order to prevent mist or humidity from entering. Otherwise this would lead to short circuits or fire. Do not exceed the maximum torque of the connection in order to avoid leakage. Make the connection of the refrigerant piping as mentioned below: 1. 2. 3. 4. 5. 6. 7. 8. 9.

Remove the valve cover from the outdoor unit. Remove the rubber plug from the valve. Remove the sealing cap from the pipes. Adjust the connection pipes. Connect the female connector of the pipes to male connector of the unit. Tighten all fittings with torque wrench and open-end spanner. Obey strictly the tightening torques in the chart listed. Open the gas valve and the liquid valve with an Allen key. Check all mechanical joints by an electronic gas detector for leakages (refer to further information on page 88 of this document). 10. Connect the electrical wiring between the indoor and outdoor unit and affix them by using a cable strap, so that the connection cannot shift. Mechanical Connectors at Pipes with

Tightening torque (Nm)

¼” ⅜” ½” ⅝”

14 to 18

GREE Service Manual GWC09AA / K5NNA6A

First Leak-Check at interconnected components!

34 to 43 49 to 61 68 to 82

Page 66

The Quick-Coupler Valves To interconnect the Pipe-Set for refrigerant transfer (liquid-line and suction-line) Quick-Coupler are used. All parts used for AC system assembling are precharged with pressurised refrigerant R-290. The release of refrigerant is practically not possible during the correct connection of the quick coupler. Advantages with the use of quick-coupler: • Fast and easy connection of liquid– and suction line in fixed installation from the evaporator to the valve assembly of the outdoor unit. • Durable gas tight interconnection. • Repeated interconnection is possible (placing of the AC unit at another suitable installation place).

The valve and quick-connector assembly consists of: Suction Line (L) 1. Stop valve at outdoor unit (stem to be activated by Allen-key) with ½” SAE connection. 2. Service port 1/4” SAE connection with internal Schrader valve . 3. Male Quick-Coupler part—valve side 4. Female Quick-Coupler part—Suction line side with ½” pipe joint. Liquid Line (H) 5. Stop valve at outdoor unit (stem to be activated by Allen-key) with ¼” SAE connection. 6. Male Quick-Coupler part—valve side 7. Female Quick-Coupler part—Suction line side with ¼” pipe joint.

For leak free connection of the pipe set to the outdoor unit valves in total four (4) mechanical connections have to be tightened!

With final commissioning of the system all theses mechanical connections are subject to a leak check with appropriate leakdetector!

7 Tighten here! 6 5 H 4 1

Valve Caps

3

2

GREE Service Manual GWC09AA / K5NNA6A

L

Tighten here!

Carefully mount the valve caps and the service port cap back to the stop-valves and include these spots into the leak-check activities!

Page 67

Commissioning Checks before commissioning Before the AC split system commissioning any installation work on the indoor and on the outdoor unit must be finished completely. For the first time activation make sure that the following working steps listed below are complete: 1. The outdoor unit is mounted securely and tightly screwed in order to prevent vibrations during operation. The fixing ground is stable enough in order to carry the weight of the unit. 2. The wall penetrations are filled and tightened with moisture-resistant insulation and sealed professionally. 3. The earthing wire has been checked. 4. The water drain hose (condensate) is mounted correctly. 5. The surrounding area nearby the indoor and the outdoor unit is free such that neither the air intake nor the air outlet is obstructed. Refrigerant circuit The outdoor unit is prefilled with the refrigerant HC R-290. The filling quantity conforms to the necessary filling of the indoor and outdoor unit, as well as for the functional pipe set and is strictly limited to the labelled amount. First operation of the system The first operation of the system is done under supervision of a trained and competent person. This is to ensure that all installation activities are made properly, that the system is wired correctly and that the unit operates with the intended performance. 1. 2. 3. 4. 5.

Ensure that any tools and installation debris are removed from the units. Switch on circuit breakers after the installation is completely finished. Check the correct connection and the electrical wiring once again. Make sure that all valves are opened. Switch on the system for first operation. Press the “ON/OFF“ button of the remote control in order to start the unit. 6. By pressing the “MODE“- button switch the system through the different modes of operation: COOL, DRY, FAN in order to find out about the correct operation of the unit in all modes. 7. Check the system operation for at least 15 min. 8. Afterwards, check the indoor and the outdoor unit for the following aspects mentioned below:

Indoor unit 1. Activate all buttons of the remote controller and confirm that they evoke the requested effects (compare pages 27 to 30) 2. Confirm that all lights and displays operate. 3. Confirm that the actuating drive of the air-flow louver operates properly. 4. Confirm that condensate drains without any obstruction. 5. Measure the entering-air and the leaving air temperature of the indoor-unit with start-up and at the end of the 15 minutes test. 6. Finally the measured temperature difference across the indoor unit air inlet and air outlet should be at about 8 K.

GREE Service Manual GWC09AA / K5NNA6A

Page 68

Outdoor unit 1. Confirm that there is no anomalous noise or vibration (other than the normal known working conditions) during operation. 2. Check the refrigerant circuit: Connect a low pressure gauge with a refrigerant hose to the 1/4” SAE service port of the outdoor unit. Confirm that the female 1/4” hose connection provides a correct adjusted coredepressor to enable the opening of the “Schrader-valve” inside the service port. 3. Measure the suction pressure: the suction pressure must be within a range of 4 to 6 bar (gauge pressure). The system must not be operated outside the normal running parameters. If it is found that the measured values differ from these value, it may indicate a malfunction of the system or indicate a deficit of refrigerant. 4. Search for leakage with an electronic gas detector. 5. After several seconds, close the liquid valve at the outdoor unit in order to pump the refrigerant to the high-pressure side of the system (pump-down). This will enable the disconnection of the low-pressure gauge and hose from the low-pressure valve of the outdoor unit without loss of refrigerant. Check the pressure of the LP gauge; if the pressure is at 0 bar or slightly above, remove the gauge with the hose from the LP stop-valve. 6. Open the stop-valve at the liquid side of the system again. 7. Put back again the sealing caps to the valves and the service port. 8. Finally, carry out the search for refrigerant leakage. After switching off the system, check for the electrical insulation resistance. Regardless of any other national laws and requirements, the resistance of the live and neutral wire must be above 7 MOhm. 9. Install the valve cover back to the housing of the outdoor-unit.

Handing over the new system to your client The client must be comprehensively instructed on the operation and the functions of the system, as well as the handling of the remote control. Show to the client the relevant pages of the users’ / operators’ manual where they will find suitable and specific information. Handover the operation manual to the client, as well as this instruction manual. Request that the client keeps the technical data sheets and all instruction manuals nearby the unit. For the documentation of the system commissioning and clients instruction, use the “Start Up Data Sheet” report placed on the following page.

GREE Service Manual GWC09AA / K5NNA6A

Make sure leak checking is done on the suction side of the unit without operation of the unit. In contrast check for leaks to the liquid side whilst the unit operates. Because! Suction pressure is higher at the low pressure site of the system in “Off” position! Pressure at the liquid stop-valve is higher under operational conditions of the system. Leaks are better detected under higher pressure.

Fill the “Start Up Data Sheet” report, sign it and hand it over to the client!

Page 69

Start Up Data Sheet for GREE Split Air-Conditioner Installation Company Address Telephone & Fax Technician Name Registration No. Client / Company Contact Person Installation / Appliance DATA Model and No. Date of Installation / Repair Comments / Repair Operating Data – Cooling Mode Refrigerant Type

R-290

Refrigerant Name

Propane

Refrigerant charge

0,200 kg

Suction Pressure P1 Suction Temperature equivalent P1 Air Temp. Entering Condenser T3 Air Temp. Leaving Condenser T4 Air Temp. Entering Evaporator T1

Flammable Refrigerant

Air Temp. Leaving Evaporator T2

Performance Test: With appliance commissioning please operate the split– air conditioner with HIGH indoor fan speed in mode COOLING for a minimum of 15 MINUTES. Measure air inlet (T1) and air outlet (T2) temperature at the indoor unit. The temperature difference should be at least 8 K. Electrical Data Power Supply (Voltage) Overall Ampere Reading Current draw Compressor Other executions for system commissioning!

Tick box for completion

Only use correct and reliable tools / equipment for system commissioning! Functional AC system check including performance test! Check the AC system for refrigerant leakage! Check that electrical connections are tight! Check that condensate drain is tight and with down-grade! Check insulation of refrigerant transfer tubes and quick-coupler! Check free run of condenser and evaporator fans! Check system operation (indoor/outdoor) on abnormal operational noise! Clean system components including air filter (if indicated) Check display of the remote controller! Execute briefing of the AC system user! Company signature and date:

GREE Service Manual GWC09AA / K5NNA6A

Client signature and date:

Page 70

Service, Repair and maintenance A permanent stand-by, the reliability of the system and the expected system efficiency requires a regular preventive maintenance and professional service to minimise the possibility of malfunction. The annual preventive maintenance and any required service should be done by a specialised company and personnel only (competent person).

For the required tools please note the chart on pages 130 to 134.

Directives for service and maintenance 1. Carry out any service or maintenance to the system only if the working area is well ventilated. Make sure that windows and doors are open. 2. Do not use open fires and remove any source of ignition away from the installation/work site. (2 m safe distance is recommended). 3. Do not use cell phones during maintenance and advise other attendees not to use open fires or cell phones. 4. Take precautions to avoid static charges. In order to do so wear e.g. cotton clothing and protection gloves made of cotton. 5. Should it be demanded to leave the room during maintenance – for example in order to get spare parts – make sure that no unauthorised persons enter the room during your period of absence. Use appropriate signs. 6. Make sure of a correct grounding during maintenance as demanded by regulations. 7. In case of transporting the refrigerant cylinders, assure yourself that the cylinder pressure is not above the allowed pressure. 8. Place cylinders only in an upright position and make sure that the cylinder is not placed nearby heat or fire sources, sources of radiation or electric devices. 9. In exceptional cases, it might be necessary to dismantle the system and to bring it to an authorised service centre. 10. However, all services could be done to the unit locally. 11. Become familiar with the operation of a gas detector. Leave it turned on in the immediate working area during maintenance in order to get an early warning about leaking gas. 12. Before beginning maintenance ensure sufficient security- and emergency measures are provided and ready for operation. 13. Ensure an appropriate fire extinguisher (CO2 or dry powder) is ready for use.

GREE Service Manual GWC09AA / K5NNA6A

Page 71

Regular Annual Preventive Maintenance In general the regular and preventive maintenance is limited to cleaning activities and to scrutinise the system functions and parameters. This is to verify that the system is operating in safe condition and with expected efficiency. The following procedures describe how to carry out professional maintenance of the HC R-290 air-conditioner.

Required maintenance of the indoor unit 1. Examine the fan for functionality and smooth running. 2. Carefully clean the air-filter, if necessary use a shower bath with hand-warm water. 3. Check the heat-exchanger (evaporator) for contamination, if necessary clean the evaporator (water and/or evaporator cleaning solution). 4. Check the alignment of the evaporators fins, if necessary carefully adjust the alignment by the use of a fin-comb 5. Check and clean the condensate pan and drain hose 6. Check the control board (mode and temperature indicators) 7. Check the connection cables, wires are free of damage and screws are tight. 8. Check the remote controller for functionality. 9. Clean the housing of the indoor unit. 10. Verify the specific condition according the provided checklist with page 73.

Servicing the outdoor unit 1. Examine the fan for functionality and smooth running. 2. Examine the compressor for functionality and smooth running. 3. Check that the fixings and vibration dampers of the compressor are in good condition. 4. Check the heat-exchanger (condenser) for contamination, if necessary clean the condenser with OFDN 5. Never use refrigerant for cleaning of the heat exchanger. 6. Check the alignment of the condensers fins, if necessary carefully adjust the alignment by the use of a fin-comb. 7. Check the connection cables, wires are free of damage and screws are tight. 8. Check the operational conditions of the refrigeration system. 9. Clean the housing of the outdoor unit. 10. Verify the specific condition according the provided checklist with page 102.

Refrigerant circuit Examine the refrigerant circuit and check that it is free of leaks by using a HC gas detector, which is reliable and safe for use with HC refrigerant R-290. Pay particular attention to the connections of the pipe-set between the indoor and outdoor unit, as well as to the brazed joints and mechanical connections. Verify that all refrigerant transferring pipes are free of vibration and do not touch each other (friction). If repair or system service is necessary (in specific, if an intervention into the refrigerant circuit is indicated), required activities have to be carried out with due care and according to the advices described with the “Service, repair and maintenance” section (beginning on page 71) of this manual. Always wear your individual protective devices!

GREE Service Manual GWC09AA / K5NNA6A

Page 72

Maintenance Checklist R-290 AC Assembly group

Repaired

Replaced

Cleaned

Value / Remark

Indoor unit Surface heat exchanger Evaporator fins Condensate pan and drain hose Air filter Fan, motor and smooth operation Indoor air temperature °C Intake Outlet Outdoor unit Surface of heat exchanger Condenser fins heat exchanger Fan, motor and smooth operation Housing Outdoor air temperature °C Intake Outlet Compressor Compressor fixing and dampers Operational noise Drawn current Refrigerant discharge temperature °C Ref. suction gas temperature °C Suction pressure (bar) Refrigerant circuit Leak tightness Vibrations of pipes Friction of pipes Control system and electrics Remote control Cables and wiring / fixing, friction Wiring – screws tightness Temperature sensors Relays or other electr. components Miscellaneous Labelling oft he system Availability of documentation Any clients complain Signature of technician GREE Service Manual GWC09AA / K5NNA6A

Date: Page 73

Safety Work Area and Temporary Flammable Zones When working on systems using flammable refrigerants, the technician should consider certain locations as “temporary flammable zones” (see also page 75). These are normally regions where at least some emission of refrigerant is anticipated to occur during the normal working procedures, such as recovery, charging, and so on; typically where hoses may be connected or disconnected. In general, the work schedule for refrigerant handling during service and repair activities, should be arranged in a manner that the release of refrigerant is not necessary (e.g. “pumping down“ the system and moving the refrigerant charge to the high site of the system). In anticipation of the maximum quantity of refrigerant that may be released during such a procedure (such as disconnecting a hose whilst it is full of liquid refrigerant), the minimum distance in all directions and with respect to the occupied working area where the service equipment is placed, should be a minimum of two metres.

Strategically plan your work schedule and create a SAFTY WORK AREA of a minimum of two (2) metres!

Indoor Unit Outdoor Unit 2 Metres Safety Area

The two (2) metres safety working area is in case of any accidental release of refrigerant that forms a flammable mixture with air!

For any reason and under specific circumstances where service or repair activities have to be carried out on the indoor unit (breaking into the refrigerant carrying system), the designated two (2) metres safety area will apply the same way as indicated for the outdoor unit!

GREE Service Manual GWC09AA / K5NNA6A

Page 74

Arrangement of Equipment and Tools The drawing below indicates the arrangement of equipment and tools for service work where flammable refrigerant can be present. The interconnection with refrigerant transfer hoses is also shown. Capital letters designate the specific valve or refrigerant hose. Within the following pages are these letters again in the course of activity sequences to be carried out for specific service activities like charging of refrigerant or evacuation of the system. If specific valves have to be activated or refrigerant hoses to be connected, the letter indicates the position in the diagram for reviewing and better understanding.

Valve

Refrigerant Hose

A

Manifold Low Pressure Gauge

E

Connection Hose A > L

B

Manifold Vacuum Pump

F

Connection Hose B > Vacuum Pump

C

Manifold Refrigerant Cylinder

G

Connection Hose C > R-290 Cylinder

D

Manifold (Vacuum Gauge)

I

Connection Hose D > Vacuum Gauge

H

Outdoor Unit Liquid Side (High)

K

Vent Hose 5 m length ½” (12 mm) inner diameter

L

Outdoor Unit Gas Side (Low)

H

E

B

L

A

C D

Temporary Flammable Zones K

F

G

I

GREE Service Manual GWC09AA / K5NNA6A

Page 75

Refrigerant Venting In order to open the refrigerant cycle (for any repair, replacement of parts and subsequent brazing or tube joining with pressing connections) the total R-290 refrigerant charge has to be removed from the system. Venting can be carried out as an alternative to recovering the refrigerant. If venting is considered, it should be done in accordance with the relevant national laws. Normally, venting is only carried out with systems that contain a small quantity of refrigerant, larger quantities should be recovered. If venting is to be carried out, a set of special procedures is required to ensure that it is done safely, by following the general safety procedures and through appropriate use of a suitable hose. Important Notes! 1. 2. 3. 4. 5.

6. 7.

8.

9. 10. 11. 12.

13. 14.

Venting inside a building is not permissible under any circumstances. Venting must not be to a public area, or where people are unaware of the procedure taking place. The hose must be of sufficient length of about a minimum of 5 m The hose should have a minimum of 12mm (½”) internal diameter Venting should only take place on the certainty that the refrigerant will not get blown back into any adjacent buildings, and that it will not migrate to a location below ground level The hose is made of material that is compatible for use with HC refrigerants and oil A device is used to raise the hose discharge at least 1 m above ground level so that the discharge is pointed in an upward direction (to assist with dilution) Close to the inlet of the hose, an oil separating device is fitted to present the emission of refrigeration oil, so that it may be collected and disposed of properly following the venting procedure (a recovery cylinder may be used for this) There must be no sources of ignition near the hose discharge A flammable gas warning sign must be positioned close to the hose discharge The hose should be regularly checked to ensure that there are no holes or kinks in it that could lead to leakage or blocking of the passage of flow When carrying out the venting, the flow of refrigerant should be metered using manifold gauges to a low flow rate, so as to ensure the refrigerant is well diluted. The venting process has to be monitored for the entire time. Once the refrigerant has ceased flowing, the system must be flushed out with OFDN; if not, then the system should be pressurised with OFDN and the venting procedure carried out two or more times, to ensure that there is minimal HC refrigerant remaining inside the system.

GREE Service Manual GWC09AA / K5NNA6A

Page 76

Refrigerant Venting—Part 1 Connect the manifold gauge as indicated below to the service port of the outdoor unit. LP valve port “A” enables to vent the HC refrigerant at a low flow rate in an easy-to-control manner. The venting of the HC refrigerant takes place via a two-valve access port equipped recovery cylinder, which will act in this specific case as an oil separator. The vent-line is connected at the gas valve of the recovery cylinder. The release of refrigerant transfers lubricant from the outdoor unit will now remain in the recovery cylinder. The end of the 5 m vent-line is placed on about 1 m high stand to ensure better dilution of HC refrigerant in air during the venting process. A flammable gas warning sign must be positioned close to the hose discharge port to indicate that there is an occurrence of flammable gas during venting activity.

Stand

Vent Line

K

B A

C D L

E

G

Recovery Cylinder with 2-Valve access GREE Service Manual GWC09AA / K5NNA6A

Page 77

HC Refrigerant Venting—Course of activities sequences 1 Section – Refrigerant Venting Steps recommended for part 1 No

Where Activities

1 2 3

A, B, C, D,

Carry out all intended works without hurry and THINK BEFORE ACTING! Arrange your tools, manifold and equipment connections as indicated on page 77 Manifold gauge valves “closed” AC system “OFF“ (unplugged)

4

6

Place a warning signboard in front of your work area and at the end of the vent-line to indicate that flammable refrigerant gas will be vented to the environment and that no unauthorised people may enter the safety work area. Smoking and open flames are prohibited.

7

No other sources of ignition must exist within this area (including your cell phone).

5

Place your HC leak detector on the floor close to your tools arrangement. Switch on the leak detector. If HC refrigerant is detected you will hear the warning signal. Inform other individuals about the safety measures and your projected time span to maintain all service activities. Assure that all other necessary service tools and spares for the intended job are in place. Confirm that the circumstances for the intended job are safe.

8 9 10 11

Provide a hose with a length of a minimum of 5 metres (actual needed length will be according to installation site condition) and an inner diameter of a minimum of 12 mm.

12 E, L

Assure that the refrigerant transfer hose with the connection at the suction line service port “L” consists of a core depressor to open the service port inner core valve during connection.

K, G

Interconnect the EMPTY recovery cylinder with manifold and vent-line. The refrigerant hose G must have access to the liquid port of the cylinder (dip-tube) and the vent-line K to the gas port of the cylinder. This connection enables oil to be separated in the cylinder during refrigerant venting process.

L

Open the suction side stop valve at the outdoor unit and both valves of the recovery cylinder. Open valves at manifold gauge set. Refrigerant starts venting and the flow of refrigerant can be easily and safely controlled by operation of valve A. This process should be carried out until no flow of refrigerant is determined. Pressure at A, C is Zero. Close the low side valve A at the manifold gauge set.

13

14

15

A, C 16 17 18

E

A

GREE Service Manual GWC09AA / K5NNA6A

Consider that the service port of the suction side stop valve is equipped with a Schrader valve. Hose connection must have an adjusted coredepressor to open the Schrader valve core correctly!

For safe venting of HC refrigerant and

Oil-Separation an EMPTY recovery cylinder is needed!

Page 78

Refrigerant Venting—Part 2 After determining that there is obviously no flow of refrigerant venting from the outdoor unit, a proportionally high residual amount of HC refrigerant is absorbed within the compressor lubricant and left in the system. To empty the system from residual HC refrigerant as much as possible, a vacuum pump should be connected to the system. Disconnect the recovery cylinder (oil-separator) from the system and install the vent-line to the exhaust port of the vacuum pump. The free end of the vent-line remains on the stand as described on the previous page of this section. Lowering the pressure in the system, the residual refrigerant absorbed within the lubricant starts evaporating and gets transferred with the vacuum pump and vent-line to the ambient. A flammable gas warning sign must be positioned close to the hose discharge port to indicate that there is an occurrence of flammable gas during venting activity.

Stand

Vent Line

K

B A

C D L

F

E

GREE Service Manual GWC09AA / K5NNA6A

Page 79

HC Refrigerant Venting—Course of activities sequences 2

No 19 20

21

22

Section - Refrigerant Venting Steps recommended for part 2 - use of vacuum pump Where Activities K Close gas and liquid valve of the recovery cylinder. Disconnect the vent-line from the gas port of the recovery cylinder (oilseparator) See sequence 1 from page 78. G, C Remove the refrigerant hose from the liquid port of the recovery cylinder. Close valve C. B, F Place the vacuum pump and connect a ⅜” vacuum hose. The vacuum pumps On-Off switch is in ON position. Plug and socket of the vacuum pump are not connected and placed behind the two (2) metre safety area. This will avoid sparking within the safety area with the operation of the “ON – OFF” switch. K Connect the vent-line to the exhaust port of the vacuum pump There should not be a noteworthy overpressure remaining within the AC system except the out-gassing refrigerant from the compressors lubricant.

23

24 25 26 27 28 29 30 31

A, B

E

Note that higher remaining refrigerant overpressure from the AC system will damage the vacuum pump during operation! Operate the vacuum pump by plugging in the power plug. Open the low side valve A and the vacuum pump valve B at the manifold gauge set. Operate the vacuum pump for about 20 minutes to remove most of the remaining R-290 refrigerant from the AC system. End of the HC refrigerant recovery and venting process.

A,B,C, Valves at manifold gauge closed D L, H Stop valves at the outdoor unit closed Disconnect the vacuum pumps plug connector from powersocket (outside the 2 m safety area).

32

Remove the venting hose from the vacuum pump. Remove the manifold gauge set with hoses from the outdoor unit.

33

Place the recovery cylinder at the venting area where the flammable gas warning sign is placed and open the gas valve to vent any remaining HC gas from the cylinder. Drain the oil from the cylinder, (gas-valve) by holding the cylinder upside-down, in an appropriate container for used and contaminated lubricants.

Note: The recovery cylinder for “oil-separation” should be used regularly for this purpose since the contamination with oil will not classify this cylinder for further activities with refrigerant, if not cleaned inside professionally.

GREE Service Manual GWC09AA / K5NNA6A

The vacuum pump is used to recover the remaining HC refrigerant from the AC system. For safety reasons the vacuum pump is switched ON and OFF by putting in the plug into the socket. Plug and socket are placed behind the two (2) metre safety area.

Page 80

Equipment for the use of Oxygen Free and Dry Nitrogen (OFDN) in the field of RAC Servicing Practices Nitrogen is a natural gas and does not contribute to environmental pollution in general if vented to the atmosphere. Nitrogen is tasteless, odourless and colourless and consists of 78.08 % within the air we breath. In addition, Nitrogen is non-flammable and does not support combustion. For refrigeration technologies Nitrogen is available in both, liquid and gaseous form. The nitrogen (OFDN) we commonly use for servicing refrigeration and air–conditioning systems is supplied and transported in high pressure cylinder. Commonly RAC used OFDN cylinder are specified as follows: Cylinder Content (Litre)

Filling Pressure (bar)

Gas Content (m³)

Cylinder gross weight (ca. kg)

5

200

1

9.8

10

200

1,911

15.7

20

200

3,822

37.0

50

200

9,556

77.7

Purity 4.0 OFDN gas is of 99.99 % and a water content of maximum of 30 ppm.

For the use in RAC installation, servicing and maintenance technologies only use OFDN gas and cylinders in combination with a reliable and appropriate pressure regulator to safely reduce the pressure of the gas to a controlled level! The OFDN gas must only be transferred into the refrigerant circuit by the use of transfer hose designed and certificated for this purpose. For most cases refrigerant transfer hoses may have this classification. Check your refrigerant hoses for reliable use with pressurised OFDN gas. OFDN gas in refrigeration is used in general for the following activities:

The nitrogen vented from a cylinder will reduce the oxygen content in the surrounding area and can cause suffocation!

Do not use oxygen or compressed air to pressurize RAC systems because when mixed with oil (e.g. compressor lubricant) for most refrigerants these gases can cause explosions!

1. 2. 3.

Leak test in combination with a weak soapy water solution (bubble test). Pressure test (strength test) of RAC systems. Only use OFDN In mixed concentration with Hydrogen (95% Nitrogen and 5% Hydrogen) gas and pressure as a so-called Forming gas for Leak Test procedures in combination with cylinder in combiHydrogen Leak Detectors. nation with a reli4. Refrigerant circuit flushing to remove contaminants and e.g. to free able and approblocked components and capillaries from obstructions. priate pressure 5. Purging of air from pipe work before heating and during brazing (to preregulator. vent formation of copper oxides on the inner surface of pipes). 6. Purging refrigerants from pipe work and components during brazing to avoid production of extremely toxic, acidic and harmful products. If possible use 7. To be used as “protective gas” and charged in a system or components an intermediate for assembling to avoid introduction of air and humidity. pressure gauge, 8. To clean surfaces of heat exchangers (e.g. condenser) from dust and dirt. equipped with control valve, In most of the above-mentioned activities OFDN can deploy in addition its fawithin the Nitrovourable capability to absorb a large part of remaining water content within a gen transfer refrigerant circuit during system commissioning procedures. hose for system Note: monitoring Pressure regulators are designed to control the pressure and they are supplied (see next page) with gauges to indicate pressure. Regulators do not measure or control flow of the OFDN media unless the arrangement is equipped with devices (metering valve or flow meter) specially designed for those purpose. GREE Service Manual GWC09AA / K5NNA6A

Page 81

Only use OFDN gas and pressure cylinder in combination with a reliable and appropriate pressure regulator.

OFDN Cylinder and Pressure Regulator Arrangement

Pressure Regulator

Cylinder Vale Pressure Adjusting Knob OFDN Transfer Hose OFDN Cylinder, here 5 Litre content Base Frame for Safe Use

Scale for strength test values

Example

Intermediate gauge for system monitoring

Control valve ¼” SAE connection for OFDN transfer hose

Connection to pressure regulator

Working Pressure Cylinder Pressure

Cylinder Connection Outlet Valve

OFDN Transfer Hose Connection

Pressure Regulator Pressure Adjusting Knob Example GREE Service Manual GWC09AA / K5NNA6A

Page 82

The use of “Oxygen Free and Dry Nitrogen” (OFDN) Flushing the system and providing a “Holding Charge” of OFDN to the system: After HC refrigerant removal (venting and recovery by vacuum pump) from the system, the empty refrigerant circuit should be flushed with OFDN in order to assure that there is no remaining HC in the system but also to blow-out other possible contaminants including humidity. In case of no further actions to the system e.g. disassembly of indoor and outdoor unit for transport to the companies repair shop or an on-site specific components replacement at a later date, an OFDN holding charge should be supplied to the refrigerant circuit. This is in general to avoid that air or humidity will be introduced into the system and cause contamination. Provide a filled Nitrogen Cylinder (containing OFDN gas) equipped with reliable pressure regulator and Nitrogen transfer hose (N), having a ¼” SAE female adapter and with Schrader valve core depressor. Secure the cylinder! The warning sign is still placed in the work-area because we are now handling a pressurised (about 250 bar) cylinder and OFDN gas is intentionally blown off from the system to the ambient area!

N L

GREE Service Manual GWC09AA / K5NNA6A

Never switch ON the AC system if charged with OFDN!

Page 83

Flushing the system and provision of a “Holding Charge” with OFDN — Course of activities sequences Section – Flushing with OFDN and provision of Holding Charge Steps recommended No

Where Activities

1

Carry out all intended works without hurry and THINK BEFORE ACTING!

2

AC system “OFF” (unplugged) and emptied from HC refrigerant.

3

Arrange your tools and equipment connections as indicated on page 83. The pressure adjusting handle (screw) of the pressure regulator is back-seated. The cylinder valve and the pressure regulators outletvalve to the OFDN transfer hose (N) is closed!

4

N, L

Assure that the nitrogen transfer hose with the connection at the suction line service port “L” consists of a core depressor to open the service port inner core valve during connection.

5

N, L

Connect the OFDN cylinder with transfer hose N to the service port of the outdoor units low-side stop valve L

6

H, L

Open the outdoor units low-side and high-side stop valves.

7

Open the OFDN cylinder valve

8

Adjust the pressure regulators pressure adjusting handle (screw) to about 10 bar shown at the delivery pressure gauge

9

Open slowly the pressure regulators outlet-valve

10

OFDN now is transferred into the complete AC system. Continue the transfer of Nitrogen until there is no further flow audible (pressure equalisation) and 10 bar is indicated.

11

Close the pressure regulators outlet-valve

12

N, L

Remove the OFDN transfer hose from the service port

13

Carefully open the service ports Schrader valve using a valve “pin” depressor (e.g. small screw-driver) and blow-out the Nitrogen charge. If necessary hold a piece of old cloth (or paper) into the flow stream to keep eventually escaping oil from the system. Ensure ventilation of the work space during gas venting. Do not inhale the escaping gas.

14

If there is no further flow of gas audible or sensible, the process of system flushing is finished.

15

To add an OFDN Holding Charge to the system start again with step No. 5 to No. 12 and end with No. 16 and No. 17 of this course of activities. A charged amount of about 5 bar is sufficient.

16

17

H, L

Close the outdoor units low-side and high-side stop valves (frontseated position) Close the OFDN cylinder valve. Return the pressure regulators adjusting handle (screw) in its back-seated position. Purge the pressure regulator from the outlet-valve (pressure regulator is now discharged).

GREE Service Manual GWC09AA / K5NNA6A

N

Interconnection of the Manifold Gauge Set should only be considered for refrigerant handling or low-pressure OFDN use. High pressure OFDN use will cause early mechanical wear of the gauge set and manifolds supplied with sight glass can cause violation by accidentally pressing out the glass from the body!

To provide a “Holding Charge” to the system is in case of no further actions to the system for the time being. Page 84

Providing a Hermetically Sealed Refrigerant Circuit Leak, Strength and Tightness Testing General: The sole purpose of this section is to raise awareness of the different methods to ensure a sealed system, applicable for GREE Air–Conditioners and to assist in determining the most appropriate one to use in different situations. Analysing a system to be free of leaks is the most important activity during RAC system installation, commissioning , maintenance or service. Having the proper test equipment is at least half of the job. Unfortunately there are so many methods of leak detection and so many types of test equipment, no one method fits every situation, especially if the refrigerant in use is flammable. Decisions need to be made as to the method used and the type of equipment needed for every leak to be found. These conditions make leak testing one of the most challenging tasks faced by service technicians. In addition, national regulations are requiring service technicians to find leaks, thus not allowing technicians the choice of just adding refrigerant to keep the system in operation, which is indeed a dangerous practice for systems using flammable refrigerants. Finally, the most important concern, handing over a safe and efficient system to the client, which has to be hermetically sealed and contains exactly the lowest amount of refrigerant charge required and is set up and configured to factory specifications and tolerances.

Best practice is to combine different leak finding methods to provide a hermetically sealed refrigerant circuit! Combine 2 & 3 and if necessary + 5

To provide a sealed refrigerant circuit the following direct refrigerant detection methods are recommended: 1. 2. 3.

Leak Testing with the use of an electronic gas detector Strength Testing by pressurising the system with OFDN Tightness Testing by pressurising the system with OFDN and subsequent “Bubble Test” Alternative: Tightness Testing by pressurising the system with N2/H2 Forming Gas mixture and the use of a Trace Gas Leak Detector

Possible Leak finding methods applicable for GREE Air– Conditioners servicing: Not recommended

Must have and do

Direct Leak Finding Methods

To be used as;

1

Soapy water bubble test with refrigerant pressure (only)

Leak Check

2

Using an HC electronic LeakDetector

Leak Test

X

3

OFDN pressurised System and soapy water (Bubble Test)

Tightness Test

X

4

N2/H2 Forming gas pressurised system and Trace Gas Detector

Tightness Test

5 Pressurising the System with OFDN

Pressure Test > refrigerant components are replaced

GREE Service Manual GWC09AA / K5NNA6A

Will be excellent

X

X X Page 85

In general, the Gree Air–Conditioners are Factory Tested for compliance with international standards and regulations. The factory test also includes a strength test. The HC R-290 Air-Conditioner is rated for a Maximum Allowable Pressure (PS) of 40 bar (4.0 MPa). For the new product installation and commissioning a sole Leak Test, using a reliable Electronic HC Leak Detector, has to be carried out. Regular Preventive Maintenance requires activities following Best Servicing Practices by employing indirect refrigerant detection techniques. Probably these activities may indicate requirements to carry out further direct detection procedures. Indirect checks for leakages include manual checks of the system and its operation conditions against the design operation conditions. These activities will include analysis of the following parameters and conditions: 1. System Pressure 2. Temperatures 3. Compressor Current

If piping, components or areas are covered by oil, or you may hear the noise of escaping refrigerant (rough leaks), this may clearly indicate that there is a potential leak existing! Replace and tighten valvecaps, otherwise leakage is guaranteed!

Refrigerant Loss Indications shall be followed by comprehensive direct tightness testing method of the operational system by the use of the HC Leak Detector. Refrigerant Loss Indicators are: 1. All deviations from normal operation conditions analysed from the abovementioned indicators. 2. Any visible damage of the system. 3. Damage of pressure switch and sensors. 4. Corrosion and oil leaks. 5. Vibration, abnormal noise, ice formation. 6. Insufficient cooling capacity. Having these preconditions of a sealed system in mind, in case of malfunction, after any modification or repair to the AC system (intervention into the refrigerant circuit) at least the affected part (refrigerant circuit piping or piping connections) shall be subject for a strength test (pressure test). The strength test pressure shall not exceed the strength test pressure applied to components by the manufacturer. During on-site activities, the complete AC system is subject for a pressure test. The Pressure Test Value for the AC system (Strength Test) is at 1.1 times of the Maximum Allowable Pressure (PS), which is indicated at the outdoor units data plate. Pressure Test Value = 1.1 x PS (40 bar x 1.1) = 44 bar (4.4 MPa) Procedures subsequent to the Pressure Test (Strength Test): A Refrigerant Leakage Detection (Leak Test) must be carried out after Pressure Test. Testing the system for leaks needs to pressurise the refrigerant circuit with the use of OFDN or if the equipment is available with a mixture of OFDN and Hydrogen (95% N2 and 5% H2) called “Forming Gas” in connection with an electronic N2/H2 Trace Gas Leak Detector.

GREE Service Manual GWC09AA / K5NNA6A

Page 86

Leak Check (Bubble Test) with a weak soapy water solution Leak Testing with the use of “Weak Soap Solution with Water” only is not a reliable comprehensive Leak Testing activity but in combination with other leak testing methods it is a simple, sensitive technology. Specifically, the bubble test method would only be unsuitable if the system or section being tested is operating in a vacuum. A soapy water solution can be used when you know the approximate area where a leak may exist and sufficient refrigerant pressure in the system is available. In addition it may be noticed that there is oil covering the surface of the suspected leak-spot. Previously e.g. an electronic leak detector has indicated a leak exists in a particular area of the hermetically sealed system. Mechanical connections will be the first choice to look for leaks in general. Many different types of soap solutions are available on the market. Some technicians create their own soapy water solution. Some purchase bubble-test bottles and may have a pen-brush to apply the solution to the suspected point of leakage. A small brush is the best (cleanest) way to work with soapy water on RAC systems. Some brands may provide “weak soap water solutions” in a spray bottle to cover quick “large” areas of pipe work or components for leak finding. Some soap solutions consist of an antifreeze mixture to avoid frosting of the solution on system parts. The advantage of most commercially produced solution for bubble test is that they have a lower density to make them even more sensitive to very tiny leaks. Hints for the use of weak soap solutions: 1. If the system does not contain sufficient pressure for leak detection, the refrigerant can be recovered from the system and the system re-pressurised with OFDN to increase the pressure. 2. Probably in some cases the escaping Nitrogen is audible and indicates the leakage location. 3. Do not pressurise the system or component to be checked, more than the manufactures leak testing standards. This pressure is usually stated on the data plate as “Maximum Allowable Pressure”. 4. In most cases for the purpose of leak testing, a safe pressure is usually about 10 bar (150 psig). Example of “Bubble Test” application and a commercially provided Leak Check fluid with Pin Brush

GREE Service Manual GWC09AA / K5NNA6A

Page 87

Electronic Gas Detectors Using an electronic gas detector is generally the fastest way to find an unknown leak or at least if refrigerant is present in the surrounding area. They can be used to quickly find a leak, or to find the area in which the leak exists in a system when you don’t even know where to start. The electronic gas detector is good for most leaks if the device is used and maintained correctly. Note: For the use with Hydrocarbon refrigerants (here HC R-290) it is important to make sure that the detector is safe and sensitive for this refrigerant. Regularly used electronic gas detectors for CFC, HCFC or HFC refrigerants are in most cases not designed for the use with HC R-290, so check with your equipment provider and review the product manual if the gas detector is safe for your specific use. An electronic gas detector gets you very close to the leak spot and can indicate leaks of less than 5 grams per year. After you find the area in which the leak is detected, you can usually decrease the sensitivity of your detector to indicate the area of the leak. Cover the leak area with some weak soap water solution to verify the exact point of the leak.

The use of Gas Detectors designed for HC Refrigerant is a SAFETY issue!

Hints for the use of electronic leak detectors: 1. Check your device at least once a year to ensure reliability and accuracy. Your equipment supplier can guide you on how to carry out calibration. In most cases it is possible to use a “reference leak source” for calibration. 2. Know your gas detector’s capabilities and also what it is not capable of de- Regular Gas Detecting. tectors may not 3. Carbon monoxide and alcohol can affect the sensitivity of most electronic be safe for the gas detectors. Be sure neither is present when checking for leaks. use with HCs! 4. For optimum leak detection, hold the sensor head as close as possible over the refrigerant transferring pipe. Move the sensor head slowly along the pipe with a maximum of 1 cm per second of speed. 5. Mechanical connections (screwed unions) or other connections must be “scanned” slowly, move the sensor head right around the complete The HC gas detector is part of connection point. a Personal Pro6. When the Gas Detector indicates a leak, it is advisable to hold the sensor tection Equiphead away from the leakage site (spot) identified, for approximately 5 secment (PPE) onds. Then check whether the device indicates a leak at the same spot again. Repeat this procedure step-by-step three times. This will verify if a leak really leak exists. 7. During other work activities with HCs (installation, service, maintenance) HC refrigerant place the Gas Detector on the floor of your work area and the device can has a higher speact as a HC Gas Warner! cific volume than air, therefore the Sensor Head refrigerants will fall when exposed to atmospheric presExample of a Gas Detector, sure. designed and safe for the use with HC refrigerants This means leak detecting on the bottom sides of the piping or components can be effective. GREE Service Manual GWC09AA / K5NNA6A

Page 88

Leak Testing with OFDN and weak soapy water solution This method consists of pressurising the empty refrigerant circuit with a reasonably high pressure of OFDN gas. A pressure, usually up to 10 bar (150 PSI) is applicable. The subsequently carried out Leak Test using a weak soapy water solution shall cover all potential areas of possible leakages. Provide a filled Nitrogen cylinder (containing OFDN gas) equipped with reliable pressure regulator and Nitrogen transfer hose (N), having a ¼” SAE female adapter and with Schrader valve core depressor. The warning sign is still placed in the work-area because we are now handling a pressurised cylinder (about 250 bar) and OFDN gas is intentionally blown off from the system to the ambient area. It is advisable to have an intermediate pressure gauge, equipped with control valve, within the Nitrogen transfer hose (N) to be separated from the pressure regulator and the OFDN gas cylinder. This arrangement will enable you to carry out a “Standing Pressure Test” and after a period of time to identify whether or not the pressure drops during this time within the AC system (or specific separated parts of the system). Fortunately, the dry Nitrogen charge in the AC system experiences a very little pressure change when the AC system is exposed to small temperature changes with the environment. This procedure may enable you to verify that the system, or separated parts of it, is free of leaks.

Never switch ON the AC system if charged with OFDN!

Example of an intermediate (Hose N) pressure gauge for “Standing Pressure Test”. The stop-valve enables you to separate the gauge from the OFDN gas cylinder and to check the refrigerant circuit by pressurising with OFDN for “pressure fall” in a certain period of time.

N L

GREE Service Manual GWC09AA / K5NNA6A

Page 89

Leak Testing with OFDN gas and “Weak Soapy Water Solution” Course of activities sequences Section – Leak Test with OFDN and Bubble Test Steps recommended No

Where Activities

1

Carry out all intended works without hurry and THINK BEFORE ACTING!

2

AC system “OFF“ (unplugged) and emptied from HC refrigerant.

3

Arrange your tools and equipment connections as indicated on page 89. The pressure adjusting handle (screw) of the pressure regulator is back-seated. The cylinder valve and the pressure regulators outletvalve to the OFDN transfer hose (N) is closed!

N, L

Ensure that the Nitrogen transfer hose with the connection at the suction line service port “L” consists of a core depressor to open the service port inner core valve during connection.

5

N, L

Connect the OFDN cylinder with transfer hose N to the service port of the outdoor units low-side stop valve L

6

H, L

Open the outdoor units low-side and high-side stop valves.

4

7

Open the OFDN cylinder valve

8

Adjust the pressure regulators pressure adjusting handle (screw) to about 10 bar (150 PSI) shown at the delivery pressure gauge

9

Open slowly the pressure regulators outlet-valve

N

OFDN is now transferred into the complete AC system. Continue the transfer of Nitrogen until there is no further flow audible (pressure equalisation) and 10 bar (150 PSI) is indicated. Watch the gauge for

10

pressure loss!

11

Close the pressure regulators outlet-valve

12

Carry out the Leak Test by covering potential brazed joints, mechanical unions or piping, with the weak soapy water solution and carefully search for bubbles. Additionally, the amount of discharging Nitrogen will indicate a leak with creating a venting noise. Repeat the Bubble Test until you are confident that no leaks exist. Use a small mirror for places that are difficult for assessment.

13

N, L

Remove the OFDN transfer hose from the service port

14

Carefully open the service ports Schrader valve using a valve “pin” depressor (e.g. a small screw-driver) and blow-out the Nitrogen charge. If necessary hold a piece of old cloth (or paper) into the flow stream to keep eventually escaping oil from the system. Do not inhale the escaping gas. Ensure ventilation of the work space during gas venting. Leave a slight overpressure in the system.

15

If a leak was found in step 12, repair the leak or replace the leaky component and continue with steps 5 and 7 to 14.

16

17

H, L

Close the outdoor units low-side and high-side stop valves (frontseated position)

Interconnection of the Manifold Gauge Set should only be considered for refrigerant handling or low-pressure OFDN use. High pressure OFDN use will cause early mechanical wear of the gauge set and manifolds supplied with sight glass can cause violation by accidentally pressing out the glass from the body!

Close the OFDN cylinder valve. Return the pressure regulators adjusting handle (screw) in its back-seated position. Purge the pressure regulator from the outlet-valve (pressure regulator is now discharged).

GREE Service Manual GWC09AA / K5NNA6A

Page 90

N2/H2 Leak Testing (Trace Gas Leak Detection ) A leak detection with the use of trace gas is a very reliable method and can find even very small leaks with a leakage rate less than 1 gram per year. This technology enables service technicians to leak-test a system at lower pressure. A process recognised as a “Fine Leak Test” is based on the use of the Forming gas as the test gas in conjunction with a special leak detector. Forming gas is a mixture of Nitrogen (N2) and Hydrogen (H2). A suitable electronic gas detector must be used — a standard gas detector is not sensitive to Hydrogen. The favourable physical properties of hydrogen are made use of here for detecting leaks. Forming gas in proportion of 95/5 % for RAC purpose contains 95% Nitrogen and 5% Hydrogen. Hydrogen constituents can escape from even the smallest leaks, and will be detected by the gas detector. A test pressure of about 5 bar is adequate for reliable fine leak test. The use of Leak The climate neutral Hydrogen gas is the smallest natural occurring molecule. Detectors deThe favourable physical property of H2 gas means that it diffuses through insusigned for Trace lating materials (or other covering material) if a leak occurs. This makes it possiGas Leak ble to test refrigerant transfer pipes or components (including mechanical conDetection is a nections) covered with insulating material without removing or damaging it. The very accurate gas can penetrate even screed, foam etc. Hydrogen Leak Detectors do not have testing method! a cross-sensitivity and for that reason a false alarm is not possible from external gases. Since Hydrogen gas has a smaller density than air (14 times lighter) it Regular Gas Dealways rises and makes “tracing” above pipes possible. tectors are not The Hydrogen share in the Forming gas serves as Trace gas, and only this gas useful for this is selected by the electronic sensor from the leak detector. technology. This leak test technology can be applied generally to all RAC systems and heat pumps. Hydrogen (H2) is a naturally occurring gas and is charged with the Nitrogen into the empty refrigerant circuit. After leak testing the gas can be vented safely into the environment. Hints for the use of Hydrogen Trace Gas (H2) leak detectors: 1. Check your device at least once a year to ensure reliability and accuracy. 2. For optimum leak detection, hold the sensor head as close as possible over the refrigerant transferring pipe. Move the sensor head slowly along the pipe with a maximum speed of 0.2 cm per second. 3. Mechanical connections (screwed unions) or other connections must be “scanned” slowly, move the sensor head right around the complete connection point. 4. When the Leak Detector indicates a leak, it is advisable to hold the sensor head away from the leakage site (spot) identified, for approximately 5 to 10 seconds. Then check whether the device indicates a leak at the same spot again. Repeat this step up to three times. This will verify if a leak really exists!

Never switch ON the AC system if charged with OFDN and Trace gas!

Example of Leak Detector for Hydrogen Trace Gas

GREE Service Manual GWC09AA / K5NNA6A

Page 91

Leak Testing with N2/H2 Trace Gas This method consists of pressurising the empty refrigerant circuit with the Forming Gas mixture N2/H2 Trace gas. A pressure, usually about 5 bar (72.5 PSI) is applicable. The subsequently carried out Leak Test using a Hydrogen (H2) Trace Gas Leak Detector shall cover all potential areas of possible leakages. Provide a filled Forming Gas Cylinder (containing the H2/N2 mixture gas) equipped with reliable pressure regulator and transfer hose (T), having a ¼” SAE female adapter and with Schrader valve core depressor. The warning sign is still placed in the work-area because we are now handling a pressurised (about 250 bar) gas cylinder with a gas mixture and after works the gas is intentionally blown off from the system to the ambient area!

N2 / H2

T L

Never switch ON the AC system if charged with Trace Gas mixture!

Cylinder filled with Nitrogen (N2) and Hydrogen (H2) mixture 95% / 5%

GREE Service Manual GWC09AA / K5NNA6A

Page 92

N2/H2 Trace Gas Leak Detection — Course of activities sequences Section – Trace Gas Leak Detection Steps recommended No

Where Activities

1

Carry out all intended works without hurry and THINK BEFORE ACTING!

2

AC system “OFF“ (unplugged) and emptied from HC refrigerant.

3

Arrange your tools and equipment connections as indicated on page 92. The pressure adjusting handle (screw) of the pressure regulator is back-seated. The cylinder valve and the pressure regulators outletvalve to the trace gas transfer hose (T) is closed!

4

T, L

Ensure that the trace gas transfer hose with the connection at the suction line service port “L” consists of a core depressor to open the service port inner core valve during connection.

5

T, L

Connect the trace gas cylinder with transfer hose T to the service port of the outdoor units low-side stop valve L

6

H, L

Open the outdoor units low-side and high-side stop valves.

7

Open the trace gas cylinder valve

8

Adjust the pressure regulators pressure adjusting handle (screw) to about 5 bar (72.5 PSI) shown at the delivery pressure gauge

9

Open slowly the pressure regulators outlet-valve

10

Trace gas is now transferred into the complete AC system. Continue the transfer of gas until there is no further flow audible (pressure equalisation) and 5 bar (72.5 PSI) is indicated. Watch the gauge for pressure loss!

11

Close the pressure regulators outlet-valve

12

Carry out the Leak Test and hold the sensor head of the trace gas leak detector as close as possible over the heat exchangers, refrigerant transferring pipes and mechanical connections. Move the sensor head slowly along the components with a maximum of 0.2 cm per second of speed. Repeat the screening test until you are confident that no leaks exist.

13

T, L

14

15

If a leak was found in step 12, repair the leak or replace the leaky component and continue with step 5 and 7 to 14.

17

H, L

T

Remove the trace gas transfer hose from the service port Carefully open the service ports Schrader valve using a valve “pin” depressor (e.g. small screw-driver) and blow-out trace gas charge. If necessary hold a piece of old cloth (or paper) into the flow stream to keep eventually escaping oil from the system. Do not inhale the escaping gas. Leave a slight overpressure in the system. Ensure ventilation of the work space during gas venting.

16

N2/H2

Close the outdoor units low-side and high-side stop valves (frontseated position) Close the trace gas cylinder valve. Return the pressure regulators adjusting handle (screw) in its back-seated position. Purge the pressure regulator from the outlet-valve (pressure regulator is now discharged).

GREE Service Manual GWC09AA / K5NNA6A

Page 93

Pressure Test (Strength test) with OFDN After any modification or repair to the AC system “intervention into the refrigerant circuit”, at least the affected part (refrigerant circuit piping or piping connections) shall be subjected to a strength test (pressure test). The strength test pressure shall not exceed the strength test pressure applied to components by the manufacturer; this may require the testing of the low-pressure side of the system separately from the high-pressure side. In fact, this is not possible for the installed GREE AC units and, in specific for heat-pumps (not applicable here), is not necessary. The pressure in the system shall be built up gradually and monitored by remote gauge or other indicator located in a safe place. Use the Nitrogen cylinders outlet pressure gauge (or an intermediate pressure gauge between pressure regulator and AC outdoor unit) for pressure monitoring. Do not use the manifold gauge set for strength test pressure monitoring. This is a dangerous practice and may cause violation. Ensure that the pressure regulator at the Nitrogen cylinder is suitable for the use with RAC systems (maximum output 50 bar)! Ensure that no unauthorised persons are within vulnerable locations in case of an inadvertent pressure burst. Example of an intermediate (Hose N) installed pressure gauge.

Interconnection of the Manifold Gauge Set should only be considered for refrigerant handling or low-pressure OFDN use. High pressure OFDN use will cause early mechanical wear of the gauge set and manifolds supplied with sight glass can cause violation by accidentally pressing out the glass from the body!

Never switch ON the AC system if charged with OFDN!

N L

The Pressure Test Value for the AC system (Strength Test) is at 1.1 times the Maximum Allowable Pressure (PS), which is indicated at the outdoor units data plate. Pressure Test Value = 1.1 x PS (40 bar) = 44 bar (4.4 MPa)

GREE Service Manual GWC09AA / K5NNA6A

Page 94

Pressure Test (Strength Test) with OFDN — Course of activities sequences Section – Pressure Test (Strength Test) with OFDN Steps recommended No

Where

Activities

1

Carry out all intended works without hurry and THINK BEFORE ACTING!

2

AC system “OFF“ (unplugged) and emptied from HC refrigerant.

3

Arrange your tools and equipment connections as indicated on page 94. The pressure adjusting handle (screw) of the pressure regulator is backseated. The cylinder valve and the pressure regulators outlet-valve to the OFDN transfer hose (N) is closed!

4

N, L

Ensure that the Nitrogen transfer hose with the connection at the suction line service port “L” consists of a core depressor to open the service port inner core valve during connection.

5

N, L

Connect the OFDN cylinder with transfer hose N to the service port of the outdoor units low-side stop valve L.

6

H, L

Open the outdoor units low-side and high-side stop valves.

7

Open the OFDN cylinder valve.

8

Adjust the pressure regulators pressure adjusting handle (screw) to about 10 bar (150 PSI) shown at the delivery pressure gauge

9

Open slowly the pressure regulators outlet-valve.

10

OFDN is now transferred into the complete AC system. Continue the transfer of Nitrogen until there is no further flow audible (pressure equalisation) and 10 bar (150 PSI) is indicated. Watch the gauge for pressure loss!

11

Slowly turn the pressure regulators adjusting handle to increase the system pressure in stages of about 3 bar (45 PSI) at a time and listen for any audible pressure loss at every step of adjustment. Watch the gauge!

12

When the pressure test value of 44 bar (4.4 MPa) is reached, close the pressure regulators outlet-valve and the cylinder valve. Listen for any audible pressure loss and watch and note the pressure at the gauge. Wind the pressure regulators pressure adjusting handle in back-seated position (pressure regulator is now discharged).

13

Carry out a Leak Test by covering potential brazed joints, mechanical unions or piping, with the weak soapy water solution and carefully search for bubbles. Additionally, the amount of discharging Nitrogen will indicate a leak by creating a venting noise. Repeat the Bubble Test until you are confident that no leaks exist. Use a small mirror for places that are difficult for assessment.

14

N, L

Remove the OFDN transfer hose from the service port.

15

Carefully open the service ports Schrader valve using a valve “pin” depressor (e.g. a small screw-driver) and blow-out the Nitrogen charge. If necessary hold a piece of old cloth (or paper) into the flow stream to keep eventually escaping oil from the system. Do not inhale the escaping gas. Ensure ventilation of the work space during gas venting. Leave a slight overpressure in the system.

16

If a leak was found in step 12, repair the leak or replace the leaky component and continue with steps 5 and 7 to 14.

17

H, L

Close the outdoor units low-side and high-side stop valves (front-seated position)

GREE Service Manual GWC09AA / K5NNA6A

N

The Pressure Test Value for the AC system (Strength Test) is at 1.1 times of the Maximum Allowable Pressure (PS) which is indicated at the outdoor units data plate. Pressure Test Value = 1.1 x PS (40 bar) = 44 bar (4.4 MPa) Ensure that no unauthorised persons are within vulnerable locations in case of an inadvertent pressure burst. Page 95

Refrigerant Circuit—Evacuation and Charging

Valve

Refrigerant Hose

A

Manifold >Low Pressure Gauge

E

Connection Hose valve A > L, Outdoor Unit

B

Manifold > Vacuum Pump

F

Connection Hose valve B > Vacuum Pump

C

Manifold > Refrigerant Cylinder

G

Connection Hose valve C > R-290 Cylinder

D

Manifold (Vacuum Gauge)

I

Connection Hose valve D > Vacuum Gauge

H

Outdoor Unit Liquid Side (High)

L

Outdoor Unit Gas Side (Low)

I

Indoor Unit B

C

A

D

G Outdoor Unit E

L H

F

GREE Service Manual GWC09AA / K5NNA6A

Page 96

Refrigerant Circuit Evacuation The Gree HC Air-Conditioner, as previously explained, is an intrinsic safe system, which comes factory pre-assembled and already charged with R-290 refrigerant ready for installation and commissioning at the client’s site. The content of impurities, non-condensable gases (e.g. air, nitrogen, etc.) and humidity within the refrigerant circuit is better than the industrial standard and this means that the inner environment of the system is absolutely clean! For first field installation of the new air–conditioning system the use of a vacuum pump is not necessary. For After-Sales servicing procedures the diagram on the previous page indicates the arrangement of equipment and tools and the interconnection with refrigerant hoses for drawing a vacuum at the system and finally charging with refrigerant. These are activities in general where flammable refrigerant can be present. Please refer to page 75 and respect the temporary flammable zones for your intended work activities and arrange for the safety area of 2 metres within your work space (see page 74). Keep in mind that before evacuation and charging of the system, the filter-drier has to be changed.

Do not use the AC-Systems refrigerant compressor or a compressor in general for vacuum processing! A reliable dualstage vacuum pump is required!

The process of drawing a vacuum (evacuation) Before charging a refrigerant circuit of any RAC system with refrigerant, a good vacuum should be drawn. This is in general to remove non-condensable gases, such as air, nitrogen or forming-gas and to dehydrate the system. Under no circumstances shall the system compressor or another refrigerant compressor be used as a vacuum pump. The reason for this is, on the one hand a refrigerant compressor cannot achieve the vacuum required and on the other hand, the AC systems compressor can be damaged by operation in a vacuum.

Measure the vacuum required with an appropriate calibrated vacuum gauge!

Favourable equipment specifications for system evacuation are as follows: 1. Always use a dual stage vacuum pump equipped with gas ballast valve and appropriate to the volume of the refrigerant circuit (about 170 litres/minute or 6 CFM) and the capability for an ultimate vacuum of 15 micron (0.020 mbar). 2. The vacuum pump should have ⅜” and ¼” male flare connections 3. At best, the vacuum pump should have a solenoid valve at the suction port to avoid any draw-back of air into the system due to a power cut during operation. 4. The vacuum pump should have an oil-mist filter at the outlet with connection for the Hydrocarbon vent hose. 5. The vacuum pump should be regularly checked for sufficient and clean vacuum pump lubricant. 6. For system evacuation, the vacuum pump should be connected and operated at the low– and high-side of the system. The operation of a vacuum pump at the GREE HC Air-conditioner, the connection to the low-side only is possible (service port provision). 7. In order to achieve the best efficiency of the pump, according to the pumps capabilities, the vacuum hose should be of the largest diameter (⅜” diameter and 2 x ⅜” female flare SAE connection) and kept to a minimum length (about 1 metre). 8. The vacuum hose should not have core depressors (pressure drop to high within the hose during evacuation) 9. The manifold gauge set should have a valve port for the vacuum pump with ⅜” and ¼“ SAE male flare connection. 10. A suitable calibrated vacuum gauge (best possible an electronic device) shall be connected to a point on the system furthest from the vacuum pump. For the GREE HC Air-conditioner service, the connection at the manifold gauge set is indicated. GREE Service Manual GWC09AA / K5NNA6A

Page 97

Monitor the evacuation procedure to maintain at least a required vacuum value of 375 Micron (0.5 mbar or 50 Pa) or higher. The time used for maintaining this value is related to the contamination of the system. In case you cannot achieve this required vacuum level the following analysis should take place: 1. 2. 3.

Check the system connected tools and hose connections for any leakages. Check the complete system for leakages. Otherwise there is a high content of water in the system.

For situation No. 3 an additional flushing of the system with OFDN can support the evacuation procedure and decrease the time spent to maintain the desired vacuum level. To ensure that there is no leak left in the system the desired vacuum level should be held without any significant rise during a 30 minutes time span whilst isolated (valve “C” closed at the manifold gauge set) and, with switched off vacuum pump. For the intention to carry out a multiple evacuation process (to increase the dryness level within the system), do not break the vacuum with refrigerant! Only use OFDN for this purpose. Solenoid Valve

⅜” and ¼” SAE male flare connection

NOTE: The required vacuum value is of about 375 Micron (0.5 mbar, 50 Pa) or higher! Measure the vacuum level with a reliable vacuum gauge

To break the vacuum (multiple evacuation process) only use OFDN gas!

Oil-mist Filter with Venting-Hose adapter

Example Vacuum Pump

Example Vacuum Hose ⅜” with SAE connections GREE Service Manual GWC09AA / K5NNA6A

Electronic Vacuum Gauge for Micron, Hg, mbar, Pa indication Page 98

Section - Refrigerant Circuit Evacuation Steps recommended No

Where Activities Carry out all intended works without hurry and THINK BEFORE ACTING! AC system “OFF” (unplugged) and emptied from HC refrigerant, OFDN or forming-gas. If necessary purge any left overpressure from the system.

1 2

Arrange your tools and equipment connections as indicated on page 96. Ensure that the refrigerant hose “E” with the connection at the suction line service port “L” consists of a core depressor to open the service port inner core valve during connection. The warning sign is

3

still placed in the work-area. 4

A, B, C, D

5

L&H

6

A

7

Open the stop valves at the condensing units high– and low- side. Open the manifold low-pressure valve. Operate the vacuum pump by plugging in the power plug. Note that placing the vacuum pump at work site should be in “ON” mode but not connected to the electrical socket! The electrical socket is outside the 2 m safety area. This will avoid sparking within the safety area with the operation of the “ON – OFF” switch.

8

10

Manifold gauge valves are closed.

B, C, D

Open manifold gauge valves (vacuum pump, refrigerant cylinder, vacuum gauge).

11

The refrigerant cylinder valve is left closed but the charging hose “G” will be evacuated during this process.

12

Obtain a vacuum of 375 Micron (0.5 mbar or 50 Pa) as indicated by the vacuum gauge.

13

B

Switch off vacuum pump remote from plug.

15

Observe vacuum gauge if pressure rises for about 30 minutes.

16

If the pressure rises but does not reach the atmospheric pressure (Zero), it indicates humidity in the system. Open B and prolong evacuation process.

17

If the pressure rises to 0 bar gauge (1 bar absolute or 100 kPa), this will indicate that there is a leak in the refrigerant circuit, the split-unit connections or the manifold gauge and hose assembly. Check system or connections for leaks.

18

The vacuum pressure stays stable.

20

A, C, D

F

Closed manifold gauge valve (vacuum pump).

14

19

E

I

Closed manifold gauge valves (low-pressure, refrigerant charging, vacuum gauge). Refrigerant circuit is evacuated and ready for charging with refrigerant.

GREE Service Manual GWC09AA / K5NNA6A

Page 99

Charging with HC R-290 refrigerant Remember that the GREE HC Air–conditioner is an intrinsic safe system where modifications of the refrigerant circuit are not acceptable. This applies specifically to the length of refrigerant pipes and the amount of charged refrigerant. The specified refrigerant charge of the AC Split-Unit is exactly 0.2 kg (200 grams) of HC R-290. The specified amount of refrigerant for the air–conditioners design-conditions is indicated on the data-plate and rated in kilograms. In case of lack of refrigerant! The operation of the GREE Air–conditioner is only permitted with the use of refrigerant R-290 for this specific technology. Extreme care should be taken not to overfill the system. Topping up of the system with refrigerant is not permitted. This will infringe the safety certification of the air–conditioner. If a loss of refrigerant is indicated you are advised to carry out the following activities; 1. Always follow the advices stated within this manual, to provide a safe working area. Refer to pages 74 and 75 of this manual. 2. Vent the remaining amount of refrigerant as indicated on pages 76 to 80 of this manual. 3. Flush the system with OFDN, see pages 83 and 84. 4. Carry out a leak test (leak finding) with OFDN and a soapy water solution, see pages 89 and 90. 5. Repair the leak or replace the defective component by using only OEM spare-parts. 6. Carry out a pressure test with subsequent leak test, see pages 94 and 95. 7. Evacuate and dehydrate the system, see pages 96 to 99. 8. Recharge the system with the specified amount of 0.2 kg of HC R-290 refrigerant, following the given guideline within this chapter. 9. A follow up leak test using an appropriate HC leak detector should always be carried out prior to leaving the site. The process of charging The charging of RAC systems with HC refrigerants is similar to those using halocarbon (e.g. HCFC R-22) refrigerants. Since Hydrocarbon R-290 (Propane) is a pure refrigerant the charging can take place in gaseous or liquid state. Keeping in mind that the specified refrigerant charge amount of the GREE Air– conditioner is relatively low and service port of the AC unit is provided at the low -pressure side only, the charging of this system can be done by taking only vapour from the refrigerant cylinder and charging to the suction line of the compressor by measuring the weight of refrigerant. The charging amount should be monitored by the use of accurate and sensitive scales. For safety reasons and to provide accurate charging, the smallest refrigerant cylinder sizes possible should be used. Arrange your equipment and tools as indicated on pages 100 and 101.

NEVER Top-Up the system with refrigerant, always follow the guidelines provided with this chapter! Do not backward retrofit the GREE AirConditioner to any other refrigerant. This will result in the operation of the system away from the design conditions, causing a loss of system efficiency. The operation of the system with any other type of refrigerant can cause system failure and probably violation of property and health.

Example of a sensitive charging scale: Capacity = 100 kg Accuracy = +/- 0.5 % Resolution = 2 gram

GREE Service Manual GWC09AA / K5NNA6A

Page 100

Section - Charging with HC refrigerant R-290 Steps recommended No Where Activities Carry out all intended works without hurry and THINK BEFORE ACTING! Continuing from section - Evacuation

1 2

3

Arrange your tools and equipment connections as indicated on page 96. Ensure that the refrigerant transfer hose “E” with the connection at the suction line service port “L” consists of a core depressor to open the service port inner core valve during connection. The warning sign is placed in the workarea.

4

AC system “OFF”, evacuated and dehydrated.

5

A, B, C, D

Manifold gauge valves are closed.

6

L&H

Stop valves at condensing unit are open

7

Open the refrigerant cylinder valve

8

Zero the weighing scales

9 10

A

Open the low pressure valve at the manifold gauge.

C

Open the refrigerant valve at the manifold gauge. Transfer refrigerant vapour slowly (50% of total charge) into the suction side of the condensing unit

11 12

Measure (note) transferred (charged) refrigerant amount C

13 14

C

Close the refrigerant charging valve of the manifold gauge set. Switch on the unit to COOLING MODE, bearing in mind that there is a time delay of 3 minutes until the compressor starts. Open the refrigerant charging valve “C” of the manifold gauge set and slowly charge accurately the remaining refrigerant amount.

15

Close the refrigerant cylinder valve

16

Record the system data (use provided form from page 102).

17

H

18

Close stop valve at condensing unit (HP). Stem in front-seated position to pump down and transfer the refrigerant into the high side section of the AC unit. If low pressure gauge indicates 0 bar, all refrigerant remaining in the hoses assembly and gauges manifold set is sucked back into the AC unit.

19

A

Closed

20

H

Open the high pressure stop valve at the outdoor unit. Stem in back-seated position.

E G

21 B, C, D Closed 22

Remove Manifold and install end-caps.

23

Final leak check with soapy water or electronic HC leak detector. H – while operational AC unit L – in “off“ mode

L&H

24

General functional test of the system and system labelling.

25

Fill Start-Up data sheet for “Service and Repair” works

GREE Service Manual GWC09AA / K5NNA6A

Page 101

Start Up Data Sheet for GREE Split Air-Conditioner—Service and Repair Installation Company Address Telephone & Fax Technician Name Registration No. Client / Company Contact Person Installation / Appliance DATA Model and No. Date of Installation / Repair Comments / Repair Operating Data – Cooling Mode R-290 Propane 0.20

Refrigerant Type Refrigerant Name Refrigerant charge in kg Suction Pressure P1 Suction Temp. P1 Air Temp. entering condenser T3 Air Temp. leaving condenser T4 Air Temp. entering evaporator T1 Flammable Refrigerant Air Temp. leaving evaporator T2 Performance Test: With appliance commissioning please operate the Split- Air conditioner with HIGH indoor fan speed in mode COOLING for a minimum of 15 Minutes. Measure air inlet (T1) and air outlet (T2) temperature at the indoor unit. The temperature difference should be at least 8 K. Electrical Data Power Supply (Voltage) Overall Ampere Reading Current draw Compressor Other executions for system commissioning! Tick box for completion Only use correct and reliable tools / equipment for system commissioning! Functional AC system check including performance test! Check the Ac system for refrigerant leakage! Check that electrical connections are tight! Check that condensate drain is tight and with down-grade! Check insulation of refrigerant transfer tubes and quick-coupler! Check free run of condenser and evaporator fans! Check system operation (indoor/outdoor) on abnormal operational noise! Clean system components including air filter (if indicated) Check display of the remote controller! Execute briefing of the AC system user! Client signature and date: Company signature and date:

GREE Service Manual GWC09AA / K5NNA6A

Page 102

Service Label to be place at the outdoor unit after service and repair.

Flammable Refrigerant R-290 Service Company Engineer Name Address Telephone & Fax No. Registration No.

This System is charged with the natural and environmentally protective Refrigerant R-290

Flammable Refrigerant Refrigerant Charge in kg Lubricant Type & Charge

0,20

Date: Signature:

If you leave the system, ensure that all valves are capped and tight (O-ring and gaskets); uncapped valves are a very common source of leakage!

GREE Service Manual GWC09AA / K5NNA6A

Page 103

Dismantling, Recycling and Disposal At the end of the life cycle of the GREE HC R-290 Air–conditioner (discontinuation of operation, economically irreparable damage) the following general activities and precautions should be implemented: 1. 2. 3.

4.

5.

6.

Avoid any hazards to operatives carrying out dismantling processes. Plug-in appliance is electrically disconnected or arrangements made for appropriately licensed person to isolate hard-wired appliances. Refrigerant is adequately vented, recovered, stored and disposed of in accordance with the national legislative and industry requirements and standards. Units and components are removed and disposed of safely and in accordance with regulations, industry codes of practice and sustainable environmental practices. The worksite is cleaned and left in presentable condition, client and organisational requirements, industry standards and sustainable environmental practices. Decommissioning and disposal documentation is completed and processed in accordance with national State regulatory requirements.

For decommissioning of the AC system and recycling or disposal of components and substances always follow the national legal requirements and environmental protection standards.

When a refrigeration or air-conditioning system is to be decommissioned, taken out of use and dismantled, or sold intact, the user who no longer requires the system, or the use thereof, shall ensure that: either, • •

the decommissioned system is leak tight so that there is very little risk of leakage during storage, and the new user of the system, or the dismantler/disposer of the system is made aware in writing of the type and quantity of refrigerant and oil contained within it, and is fully conversant with the legal and other requirements for its safe storage, handling and ultimate disposal;

or, •

the system refrigerant (and oil) charge has been adequately vented (small charge amount of Hydrocarbon refrigerant R-290) or recovered and evacuated, using a recovery unit as required, and is disposed of properly prior to decommissioning, sale or dismantling.

Only trained and certified personnel must carry out activities to maintain decommissioning of the AC system and disposal or recycling of components and substances.

GREE Service Manual GWC09AA / K5NNA6A

Page 104

Error Codes, LED Flashing and Trouble Shooting Ensure that the power input is under normal as specified with the technical details of the unit. According to the error code, identify the possible malfunction of the unit. No.

Malfunction Name

Error Code

Indoor ambient temperature sensor is open/ short-circuited

1

F1

Indoor evaporator temperature sensor is open/ short-circuited

2

F2

Outdoor ambient temperature sensor is open/ short-circuited

3

F3

PG motor (indoor fan motor) does not operate

4

5

6

Malfunction protection of jumper cap

PG motor (indoor fan) circuit malfunction by zero cross detection

C5

U8

7

E2

Low pressure protection of compressor

Possible Causes

The unit will stop operation as it reaches the temperature point. During cooling and drying operation, except when indoor fan operates, other loads (such as compressor, outdoor fan, 4way valve) stop operation; During heating operation, the complete unit stops operation.

1. The wiring terminal between indoor ambient temperature sensor and controller is loosened or poorly contacted; 2. There’s short circuit due to trip-over of the parts on controller; 3.Indoor ambient temperature sensor is damaged (Please check it by referring to the resistance table for temperature sensor) 4. Main board is broken.

The unit will stop operation as it reaches the temperature point. During cooling and drying operation, except when indoor fan operates, other loads stop operation; During heating operation, the complete unit stops operation.

1. The wiring terminal between indoor evaporator temperature sensor and controller is loosened or poorly contacted; 2. There’s short circuit due to the trip-over of the parts on controller; 3.Indoor evaporator temperature sensor is damaged (Please check it by referring to the resistance table for temperature sensor) 4. Main board is broken.

The unit will stop operation as it reaches the temperature point. During cooling and drying operation, compressor stops and indoor fan operates; During heating operation, the complete unit stops operation.

1. The wiring terminal between outdoor ambient temperature sensor and controller is loosened or poorly contacted; 2. There’s short circuit due to the trip-over of the parts on controller; 3.Outdoor ambient temperature sensor is damaged (Please check it by referring to the resistance table for temperature sensor) 4. Main board is broken.

Indoor fan, outdoor fan, compressor and electric heat tube stop operation. 2 minutes later, 4-way valve stops; horizontal louver stops at the current position.

1.The feedback terminal of PG motor is not connected tightly. 2.The control terminal of PG motor is not connected tightly. 3.Fan blade rotates roughly due to improper installation. 4.Motor is not installed properly and tightly. 5.Motor is damaged. 6.Controller is damaged.

Operation of remote controller or control panel is available, but the unit won’t act.

There’s no jumper cap on the controller. Jumper cap is not inserted properly and tightly. Jumper cap is damaged. Controller is damaged.

Operation of remote controller or control panel is available, but the unit won’t act.

1. Controller is damaged.

During cooling and drying operation, compressor and outdoor fan stop while indoor fan operates.

1. Poor air-return in indoor unit; 2. Abnormal fan speed; 3. Dirty evaporator; 4. System is normal but the indoor tube temperature sensor is abnormal, or the tube temperature sensor is not connected well.

The complete unit stops

1. The main board and display panel are not connected well. 2. The LPP terminal on the main board is not connected well, with the high pressure switch on the complete unit. 3. The wiring of the high pressure switch is loosened. High pressure switch is damaged or poorly contacted. 4. Insufficient or leaking out refrigerant. 5. The LPP input is at high level.

H6

Freeze protection

8

A/C Status

E3

GREE Service Manual GWC09AA / K5NNA6A

Page 105

Trouble Shooting for the Temperature Sensor According to the below-provided diagram, identify the possible malfunction related to the temperature sensor.

GREE Service Manual GWC09AA / K5NNA6A

Page 106

Trouble Shooting for the PG motor According to the below-provided diagram, identify the possible malfunction related to the indoor fan (PG motor) and “H6” error code indication.

GREE Service Manual GWC09AA / K5NNA6A

Page 107

Trouble Shooting for Jumper Cap Malfunction According to the below-provided diagram, identify the possible malfunction related to the Jumper Cap

GREE Service Manual GWC09AA / K5NNA6A

Page 108

Trouble Shooting for Freeze Protection According to the below-provided diagram, identify the possible malfunction related to the freeze protection and “E2” error code indication

GREE Service Manual GWC09AA / K5NNA6A

Page 109

Trouble Shooting for Compressor Low Pressure Protection According to the below-provided diagram, identify the possible malfunction related to the compressor low pressure protection and “E3” error code indication

GREE Service Manual GWC09AA / K5NNA6A

Page 110

Trouble Shooting for PCB According to the below-provided diagram, identify the possible malfunction related to the controller and “U8” error code indication

GREE Service Manual GWC09AA / K5NNA6A

Page 111

Resistance Table of Ambient Temperature Sensor for Indoor and Outdoor Unit

GREE Service Manual GWC09AA / K5NNA6A

Page 112

Resistance Table of Heat-Exchanger Temperature Sensor for Indoor and Outdoor Unit

GREE Service Manual GWC09AA / K5NNA6A

Page 113

Resistance Table of Compressor Discharge Temperature Sensor (Outdoor Unit)

GREE Service Manual GWC09AA / K5NNA6A

Page 114

Main Spare Parts List Below OEM parts should be provided only by GREE Electric Company or representatives. Other spare parts than OEM parts will violate the Air–Conditioner’s safety classification and certification status and may keep the unit in a dangerous operational situation! Once you haven't replaced the parts according to the requirement, manufacturer won't bear any responsibility.

GREE Service Manual GWC09AA / K5NNA6A

Page 115

Disassembling Procedures - Indoor Unit Be sure to wait 10 minutes or more after turning off all power supplies before starting disassembling works!

GREE Service Manual GWC09AA / K5NNA6A

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GREE Service Manual GWC09AA / K5NNA6A

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Disassembling Procedures - Outdoor Unit Be sure to wait 10 minutes or more after turning off all power supplies before starting disassembling works!

GREE Service Manual GWC09AA / K5NNA6A

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GREE Service Manual GWC09AA / K5NNA6A

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Exploded View of the GREE HC R-290 AC– Split System Indoor Unit

GREE Service Manual GWC09AA / K5NNA6A

Page 126

Part List Indoor Unit

GREE Service Manual GWC09AA / K5NNA6A

Page 127

Exploded View of the GREE HC R-290 AC– Split System Outdoor Unit

GREE Service Manual GWC09AA / K5NNA6A

Page 128

Part List Outdoor Unit

GREE Service Manual GWC09AA / K5NNA6A

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Recommended Equipment and Tools for Hydrocarbon Refrigerants Servicing

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