Gree GWHD(18)NK3FO User manual

GREE ELECTRIC APPLIANCES,INC.OF ZHUHAI
Change for Life
Service Manual
Model: GWHD(18)NK3FO
GWHD(24)NK3FO
GWHD(24)NK3GO
GWHD(28)NK3FO
GWHD(36)NK3BO
GWHD(42)NK3AO
(Refrigerant:R410A)

Service Manual
Table of Contents
Part Ⅰ : Technical Information ..............................................................................1
1. Summary ..............................................................................................................................1
2. Specications ..................................................................................................................2
3. Outline Dimension Diagram ..............................................................................10
4. Refrigerant System Diagram ............................................................................12
5. Electrical Part.................................................................................................................14
5.1 Wiring Diagram .......................................................................................................................14
5.2 PCB Printed Diagram .............................................................................................................19
6. Function and Control ..............................................................................................23
Part Ⅱ: Installation and Maintenance .........................................................28
7. Notes for Installation and Maintenance ..................................................28
8. Installation Manual ....................................................................................................30
8.1 Electrical Connections ............................................................................................................31
8.2 Installing the Outdoor Unit ......................................................................................................34
8.3 Installation Dimension Diagram ..............................................................................................35
8.4 Check after Installation ...........................................................................................................36
9. Maintenance ....................................................................................................................46
9.1 Precautions before Performing Inspection or Repair .............................................................46
9.2 Flashing LED of Indoor/Outdoor Unit and Primary Judgement .............................................47
9.3 Malfunction Checking and Elimination ...................................................................................48
9.4 Maintenance Method for Normal Malfunction .........................................................................72
10. Exploded View and Parts’ List .....................................................................74
11. Removal Procedure ...............................................................................................85
Appendix: ..............................................................................................................................105
Appendix 1: Reference Sheet of Celsius and Fahrenheit ..........................................................105
Appendix 2: Conguration of Connection Pipe ...........................................................................105
Appendix 3: Pipe Expanding Method .........................................................................................106
Appendix 4: List of Resistance for Ambient Temperature Sensor ..............................................107

1
Technical Information
Service Manual
1. Summary
Part Ⅰ: Technical Information
Outdoor Unit
GWHD(18)NK3FO GWHD(24)NK3FO
GWHD(24)NK3GO
GWHD(28) NK3FO
GWHD(42)NK3AOGWHD(36)NK3BO

2Technical Information
Service Manual
Model GWHD(18)NK3FO
Product Code CB228W03500/CB228W03501
Power
supply
Rated Voltage V~ 220-240V
Rated Frequency Hz 50
Phases 1
Cooling capacity(max~min) W 5000(2050~6200)
Heating capacity(max~min) W 5600(2500~6650)
Cooling Power Input(max~min) W 1550(500~2550)
Heating Power Input(max~min) W 1550(580~2700)
Cooling Current Input A 6.88
Heating Current Input A 6.88
Rated Power Input W 2700
Rated Current A 11.98
SEER W/W 5.6
SCOP W/W 3.8
Outdoor
Unit
Compressor Trademark ZHUHAI LANDA COMPRESSOR CO.,LTD
Compressor Model QXA-B141zF030A
Compressor Refrigerant Oil Type RB68EP
Compressor Type Rotary
L.R.A A /
Compressor Rated Load Amp (RLA) A 7.2
Compressor Power Input W 1440
Compressor Thermal Protector 1NT11L-6233
Throttling Method Electron expansion valve
Cooling Operation Ambient Temperature Range OC -15~48
Heating Operation Ambient Temperature Range OC -15~24
Condenser Material Aluminum Fin-copper Tube
Condenser Pipe Diameter mm Φ7
Rows-Fin Gap(mm) mm 2-1.4
Coil length (l) X height (H) X coil width (L) mm 851X38.1X660
Fan Motor Speed (rpm) (H/M/L) rpm 630
Output of Fan Motor W 60
Fan Motor RLA A /
Fan Motor Capacitor μF /
Air Flow Volume of Outdoor Unit m3/h 3200
Fan Type-Piece Axial-ow
Fan Diameter mm Φ520
Defrosting Method Automatic Defrosting
Climate Type T1
Isolation I
Moisture Protection IP24
Permissible Excessive Operating Pressure for the
Discharge Side MPa 4.3
Permissible Excessive Operating Pressure for the
Suction Side MPa 2.5
Dimension (W/H/D) mm 963X700X396
Dimension of Package (L/W/H) mm 1026X455X735
Dimension of Package(L/W/H) mm 1029X458X750
Net Weight kg 50
Gross Weight kg 55
efrigerant Charge R410A
Refrigerant Charge kg 1.40
2. Specications

3
Technical Information
Service Manual
The above data is subject to change without notice; please refer to the nameplate of the unit.
Outdoor
Unit
Cross-sectional Area of Power Cable Conductor mm2 2.50
Recommended Power Cable(Core) N 3
Connection Pipe Connection Method - Flare Connection
Not Additional Gas Connection Pipe Length m 5
Connection Pipe Gas Additional Charge g/m 15
Outer Diameter of Liquid Pipe(GREE Allocation)
(Metric) mm Φ6
Outer Diameter of Gas Pipe(GREE Allocation)
(Metric) mm Φ9.52
Connection Pipe Max. Height Distance(indoor and
indoor) m 10
Max. equivalent connection pipe length(outdoor to
last indoor) m 20
Connection Pipe Max. Length Distance(total lenght) m 20

4Technical Information
Service Manual
Model GWHD(24)NK3FO GWHD(24)NK3GO
Product Code CB228W03301 CB228W03401
Power
supply
Rated Voltage V~ 220-240V 220-240V
Rated Frequency Hz 50 50
Phases 1 1
Cooling capacity(max~min) W 7000(2200~10000) 7100(2200~10000)
Heating capacity(max~min) W 7700(2600~11000) 8500(3600~11000)
Cooling Power Input(max~min) W 2460(650~4550) 2400(650~4550)
Heating Power Input(max~min) W 2560(980~3950) 2350(980~3950)
Cooling Current Input A 10.91 10.91
Heating Current Input A 11.36 11.36
Rated Power Input W 4550 4550
Rated Current A 20.19 20.19
SEER W/W 5.1 5.1
SCOP W/W 3.8 3.8
Outdoor
Unit
Compressor Trademark ZHUHAI LANDA
COMPRESSOR CO.,LTD
ZHUHAI LANDA
COMPRESSOR CO.,LTD
Compressor Model QXAS-D23zX090B QXAS-D23zX090B
Compressor Refrigerant Oil Type RB68EP RB68EP
Compressor Type Rotary Rotary
L.R.A A / /
Compressor Rated Load Amp (RLA) A 11.5 11.5
Compressor Power Input W 2550 2550
Compressor Thermal Protector 1NT11L-6233 1NT11L-6233
Throttling Method Electron expansion valve Electron expansion valve
Cooling Operation Ambient Temperature Range OC -15~48 -15~48
Heating Operation Ambient Temperature Range OC -15~24 -15~24
Condenser Material Aluminum Fin-copper Tube Aluminum Fin-copper Tube
Condenser Pipe Diameter mm Φ7 Φ7
Rows-Fin Gap(mm) mm 2-1.4 2-1.4
Coil length (l) X height (H) X coil width (L) mm 982.2X38.1X748 982.2X38.1X748
Fan Motor Speed (rpm) (H/M/L) rpm 710 710
Output of Fan Motor W 90 90
Fan Motor RLA A / /
Fan Motor Capacitor μF / /
Air Flow Volume of Outdoor Unit m3/h 4000 4000
Fan Type-Piece Axial-ow Axial-ow
Fan Diameter mm Φ552 Φ552
Defrosting Method Automatic Defrosting Automatic Defrosting
Climate Type T1 T1
Isolation I I
Moisture Protection IP24 IP24
Permissible Excessive Operating Pressure for the
Discharge Side MPa 4.3 4.3
Permissible Excessive Operating Pressure for the
Suction Side MPa 2.5 2.5
Dimension (W/H/D) mm 1001X790X427 1001X790X427
Dimension of Package (L/W/H) mm 1080X485X840 1080X485X840
Dimension of Package(L/W/H) mm 1083X488X855 1083X488X855
Net Weight kg 68 69
Gross Weight kg 73 74
efrigerant Charge R410A R410A
Refrigerant Charge kg 2.00 2.20

5
Technical Information
Service Manual
The above data is subject to change without notice. Please refer to the nameplate of the unit.
Outdoor
Unit
Cross-sectional Area of Power Cable Conductor mm2 2.50 2.50
Recommended Power Cable(Core) N 3 3
Connection Pipe Connection Method - Flare Connection Flare Connection
Not Additional Gas Connection Pipe Length m 5 5
Connection Pipe Gas Additional Charge g/m 15 15
Outer Diameter of Liquid Pipe(GREE Allocation)
(Metric) mm Φ6 Φ6
Outer Diameter of Gas Pipe(GREE Allocation)
(Metric) mm Φ9.52 Φ9.52
Connection Pipe Max. Height Distance(indoor and
indoor) m 10 10
Max. equivalent connection pipe length(outdoor to
last indoor) m 20 20
Connection Pipe Max. Length Distance(total lenght) m 20 20

6Technical Information
Service Manual
Model GWHD(28)NK3FO
Product Code CB228W03600/CB228W03601
Power
supply
Rated Voltage V~ 220-240V
Rated Frequency Hz 50
Phases 1
Cooling capacity(max~min) W 8000(2200~10000)
Heating capacity(max~min) W 9300(2800~11000)
Cooling Power Input(max~min) W 2490(650~4550)
Heating Power Input(max~min) W 2580(980~3950)
Cooling Current Input A 11.05
Heating Current Input A 11.45
Rated Power Input W 4550
Rated Current A 20.19
SEER W/W 5.1
SCOP W/W 3.8
Outdoor
Unit
Compressor Trademark ZHUHAI LANDA COMPRESSOR CO.,LTD
Compressor Model QXAS-D23zX090B
Compressor Refrigerant Oil Type RB68EP
Compressor Type Rotary
L.R.A A /
Compressor Rated Load Amp (RLA) A 11.5
Compressor Power Input W 2550
Compressor Thermal Protector 1NT11L-6233
Throttling Method Electron expansion valve
Cooling Operation Ambient Temperature Range OC -15~48
Heating Operation Ambient Temperature Range OC -15~24
Condenser Material Aluminum Fin-copper Tube
Condenser Pipe Diameter mm Φ7
Rows-Fin Gap(mm) mm 2-1.4
Coil length (l) X height (H) X coil width (L) mm 982.2X38.1X748
Fan Motor Speed (rpm) (H/M/L) rpm 710
Output of Fan Motor W 90
Fan Motor RLA A /
Fan Motor Capacitor μF /
Air Flow Volume of Outdoor Unit m3/h 4000
Fan Type-Piece Axial-ow
Fan Diameter mm Φ552
Defrosting Method Automatic Defrosting
Climate Type T1
Isolation I
Moisture Protection IP24
Permissible Excessive Operating Pressure for the
Discharge Side MPa 4.3
Permissible Excessive Operating Pressure for the
Suction Side MPa 2.5
Dimension (W/H/D) mm 1001X790X427
Dimension of Package (L/W/H) mm 1080X485X840
Dimension of Package(L/W/H) mm 1083X488X855
Net Weight kg 69
Gross Weight kg 74
efrigerant Charge R410A
Refrigerant Charge kg 2.20

7
Technical Information
Service Manual
Outdoor
Unit
Cross-sectional Area of Power Cable Conductor mm2 2.50
Recommended Power Cable(Core) N 3
Connection Pipe Connection Method - Flare Connection
Not Additional Gas Connection Pipe Length m 5
Connection Pipe Gas Additional Charge g/m 15
Outer Diameter of Liquid Pipe(GREE Allocation)
(Metric) mm Φ6
Outer Diameter of Gas Pipe(GREE Allocation)
(Metric) mm Φ9.52
Connection Pipe Max. Height Distance(indoor and
indoor) m 10
Max. equivalent connection pipe length(outdoor to
last indoor) m 20
Connection Pipe Max. Length Distance(total lenght) m 20
The above data is subject to change without notice. Please refer to the nameplate of the unit.

8Technical Information
Service Manual
Model GWHD(36)NK3BO GWHD(42)NK3AO
Product Code CN860W0130 CN860W0020
Power
supply
Rated Voltage V~ 220-240V 220-240V
Rated Frequency Hz 50 50
Phases 1 1
Cooling capacity(max~min) W 10500(2100~11000) 12100(2100~13600)
Heating capacity(max~min) W 12000(2600~13000) 13000(2600~14000)
Cooling Power Input W 3500 3590
Heating Power Input W 3750 3550
Cooling Current Input A 15.42 16.43
Heating Current Input A 15.20 16.22
Rated Power Input W 4880 5300
Rated Current A 21.65 23.50
SEER W/W 5.5 /
SCOP W/W 3.8 /
Outdoor
Unit
Compressor Trademark ZHUHAI LANDA
COMPRESSOR CO.,LTD
MITSUBISHI
ELECTRIC(GUANGZHOU)
COMPRESSOR CO.LTD
Compressor Model QXAS-D32zX090A TNB306FPGMC
Compressor Refrigerant Oil Type RB68ER PVE(PV50S)
Compressor Type Inverter Rotary Inverter Rotary
L.R.A A / /
Compressor Rated Load Amp (RLA) A 14 13.5
Compressor Power Input W 3300 3010
Compressor Thermal Protector internal internal
Throttling Method Electron expansion valve Electron expansion valve
Cooling Operation Ambient Temperature Range OC -15~48 -15~48
Heating Operation Ambient Temperature Range OC -15~27 -15~27
Condenser Material Copper tube-Aluminum n Copper tube-Aluminum n
Condenser Pipe Diameter mm Φ7.94 Φ7.94
Rows-Fin Gap(mm) mm 2-1.4 2-1.4
Coil length (l) X height (H) X coil width (L) mm 1009.4X38.1X1056 1009.4X38.1X1056
Fan Motor Speed (rpm) (H/M/L) rpm 820 840
Output of Fan Motor W 170 140
Fan Motor RLA A / /
Fan Motor Capacitor μF / /
Air Flow Volume of Outdoor Unit m3/h 5200 5500
Fan Type-Piece Axial-ow Axial-ow
Fan Diameter mm Φ570-152 Φ570-152
Defrosting Method Automatic Defrosting Automatic Defrosting
Climate Type T1 T1
Isolation I I
Moisture Protection IPX4 IPX4
Permissible Excessive Operating Pressure for the
Discharge Side MPa 4.3 4.3
Permissible Excessive Operating Pressure for the
Suction Side MPa 2.5 2.5
Dimension (W/H/D) mm 1015X440X1103 1015X440X1103
Dimension of Package (L/W/H) mm 1155X490X1220 1155X490X1220
Dimension of Package(L/W/H) mm 1158X493X1235 1158X493X1235
Net Weight kg 94 102
Gross Weight kg 104 112
efrigerant Charge R410A R410A
Refrigerant Charge kg 4.3 4.8

9
Technical Information
Service Manual
Outdoor
Unit
Cross-sectional Area of Power Cable Conductor mm2 4.0 4.0
Recommended Power Cable(Core) N 3 3
Connection Pipe Connection Method - Flare Connection Flare Connection
Not Additional Gas Connection Pipe Length m 40 50
Connection Pipe Gas Additional Charge g/m 22 22
Outer Diameter of Liquid Pipe(GREE Allocation)
(Metric)1 mm Φ6 Φ6
Outer Diameter of Gas Pipe(GREE Allocation)
(Metric)1 mm Φ9.52 Φ9.52
Outer Diameter of Liquid Pipe(GREE Allocation)
(Metric)2 Φ6 Φ6
Outer Diameter of Gas Pipe(GREE Allocation)
(Metric)2 Φ9.52 Φ9.52
Outer Diameter of Liquid Pipe(GREE Allocation)
(Metric)3 Φ6 Φ6
Outer Diameter of Gas Pipe(GREE Allocation)
(Metric)3 Φ12 Φ12
Outer Diameter of Liquid Pipe(GREE Allocation)
(Metric)4 Φ9.52 Φ6
Outer Diameter of Gas Pipe(GREE Allocation)
(Metric)4 Φ16 Φ12
Outer Diameter of Liquid Pipe(GREE Allocation)
(Metric)5 / Φ9.52
Outer Diameter of Gas Pipe(GREE Allocation)
(Metric)5 / Φ16
Connection Pipe Max. Height Distance(indoor and
indoor) m 7.5 7.5
Max. equivalent connection pipe length(outdoor to
last indoor) m 20 25
Connection Pipe Max. Length Distance(total lenght) m 70 80
The above data is subject to change without notice. Please refer to the nameplate of the unit.

10 Technical Information
Service Manual
3. Outline Dimension Diagram
892 341
396
963
560
700
368
(1)Model:GWHD(18)NK3FO
924 370
4271001
790
399
610
Unit:mm
(2)Models:GWHD(24)NK3FO GWHD(24)NK3GO GWHD(28) NK3FO

11
Technical Information
Service Manual
(4)Model:GWHD(42)NK3AO
950 341
4121022
572
840
378
Unit:mm
1015 360
4401087
631
1103
401
Unit:mm
360
440
631
1103
401
Unit:mm
1087
1015
(3)Model:GWHD(36)NK3BO

12 Technical Information
Service Manual
4. Refrigerant System Diagram
outdoor
indoor
D1
C1
B1
A1
filter
A heat exchanger
gas -liquid separator
inverter compressor
discharge silencer
discharge temperature
sensor
SP
4-way valve
outdoor heat exchanger
fan
high pressure switch
B heat exchanger
C heat exchanger
D heat exchanger
filter
filter
filter
filter
Note: Not available for 14K/18K
model
C2
C3
D3
D2
B3
B2
A2
A3
A1:A－unit electronic expansion valve B1:B-unit electronic expansion valve
C1:C-unit electronic expansion valve D1:D-unit electronic expansion valve
A2:A-unit gas pipe temperature sensor B2:B-unit gas pipe temperature sensor
C2:C-unit gas pipe temperature sensor D2:D-unit gas pipe temperature sensor
A3:A－unit liquid pipe temperature sensor B3:B-unit liquid pipe temperature sensor
C3:C-unit liquid pipe temperature sensor D3:D-unit liquid pipe temperature sensor
Note: Not available for 14K/18K model
Models:GWHD(18)NK3FO GWHD(24)NK3FO GWHD(24)NK3GO GWHD(28) NK3FO

13
Technical Information
Service Manual
Models:GWHD(36)NK3BO,GWHD(42)NK3AO
M
Liquid Receiver
Outdoor Unit
Indoor Unit
Heat Exchanger
Heat Exchanger
Heat Exchanger
Heat Exchanger
Heat Exchanger
Heat Exchanger
Heating
Cooling
Compressor
Gas/Liquid Separator
Stop Valve
Four-way Valve
Capillary Oil Separator
Electronic
Expansion Valve
The outdoor and indoor units start to work once the power is switched on. During the cooling operation, the low
temperature, low pressure refrigerant gas from the heat exchanger of each indoor unit gets together and then is
taken into the compressor to be compressed into high temperature, high pressure gas, which will soon go to
the heat exchanger of the outdoor unit to exchange heat with the outdoor air and then is turned into refrigerant
liquid. After passing through the throttling device, the temperature and pressure of the refrigerant liquid will further
decrease and then go the main valve. After that, it will be divided and go to the heat exchanger of each indoor
unit to exchange heat with the air which needs to be conditioned. Consequently, the refrigerant liquid become low
temperature, low pressure refrigerant gas again. Such a refrigeration cycle goes round and round to achieve the
desired cooling purpose. During the heating operation, the four-way valve is involved to make the refrigeration
cycle run reversely. The refrigerant radiates heat in the heat exchanger of the indoor unit (so do the electric
heating devices) and absorb heat in the heat exchanger of the outdoor unit for a heat pump heating cycle so as to
achieve the desired heating purpose.

14 Technical Information
Service Manual
5. Electrical Part
5.1 Wiring Diagram
Symbol Symbol Color Symbol Symbol Color Symbol Name
WH White GN GREEN COMP Compressor
YE Yellow BN Brown Grouding wire
RD Red BU Blue
YEGN Yellow/Green BK Black
VT Violet OG Orange
● Indoor Unit
●Instruction
(1)Model:GWHD(18)NK3FO(CB228W03501)
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15
Technical Information
Service Manual
(2)Model:GWHD(18)NK3FO(CB228W03500)
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(3)Model:GWHD(24)NK3FO
CONNECTOR
L2
N2
AC-L
RT2
HPS P
COMP
U
V
UV
W
W
X1
RT3
RT1
N1
TUBE-A TUBE-B
LX2-2
LX2-1
XT1
2
XTA
XTB
L
N
N1
L'
N'
L1
E(PE)
N2
3
3
2
L4
L1 L2
L4
L3
M1
Please don't touch any terminal when the voltage of
terminal P(DC+) and N(DC-) at AP1 is higher than
30V to prevent the risk of electrical shock!

16 Technical Information
Service Manual
(4)Model:GWHD(24)NK3GO
Please don't touch any terminal when the voltage of
terminal P(DC+) and N(DC-) at AP1 is higher than
30V to prevent the risk of electrical shock!
P
COMP
U
V
UV
W
W
X1
RT3
RT1
N1
LX2-2
LX2-1
XT1
2
XTA
XTB
L
N
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3
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2
L4
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L4
L3
CONNECTOR
XTC
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3
N2
AC-L
RT2
HPS
(5)Model:GWHD(28) NK3FO(CB228W03601)(CB228W03600)
L3
L4
L4
L4
L2
L1
L4
555
2
3
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E(PE)
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V
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U
COMP
P
HPS
RT2
AC-L
N2
3
2
L2
XTC
CONNECTOR
XTD
2
3

17
Technical Information
Service Manual
(6)Model:GWHD(36)NK3BO
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18 Technical Information
Service Manual
(7) Model:GWHD(42)NK3AO
AC-L
N
COM
1 3
5 7
XT4
N(1)
2 3 3 2
N(1)
XT5
N(1)
2 3
XT6
3 2
N(1)
XT3
XT2
POWER
N
XT1
L
N(1)
2 3
9
FA
EKV1
PE
E1
FB
FC
FD
FE
RT3 RT2 RT1
T-SENSOR2
20K
OVC-COMP
θ
θ
θ
BN
BU
L1_1
L2_1
L2_2
L1_2
YE
WH
LP
HP
HPP
LPP
U
V
W
COMP
3~
OFAN
M
~
C
4YV
4V1 HEAT
EH
20K
20K
20K
20K
20K
20K
20K
20K
20K
20K
TUBE-ATUBE-B
TUBE-C
TUBE-DTUBE-E
PE PE
AP
EKV2
EKV3EKV4
EKV5
RT6
RT7RT8
RT9
RT10
RT11RT12
RT13
RT14
RT15
W1
W2
W3
W4
W6
W7
W8
W9
W10
W11
W12
W13
W14
W15
W16
W17
W18
W19
W20
W21
U
V
W
W22
W23
W24
W25
W26
L
AP
XT1 XT2
XT3
XT4
XT5
XT6
C
WH
BK
YE
BU
RD
BN
1
3
5
7
θθθθθθ θ θ θ θ
SAT
W5
L2
L1
PE
L
C SAT RT14/15 RT12/13 RT10/11 RT8/9 RT6/7 RT1 RT2 RT3 XT2-6 XT1 EH 4YV L COMP M LP HP EKV1-5
AP
INDUCTANCE IN/OUT PIPE TEMP. SENSOR A
IN/OUT PIPE TEMP. SENSOR B
IN/OUT PIPE TEMP. SENSOR C
IN/OUT PIPE TEMP. SENSOR D COMPRESSOR FAN MOTOR LOW PRESSURE SWITCH HIGH PRESSURE SWITCH 4-WAY VALVE
SYMBOL NAME
MAIN BOARD ELECTRONIC INFLATE VALVE 1-5 CAPACITOR FOR FAN MOTOR OVERLOAD PROTECTOR
PIPE TEMP.SENSOR ENVIRONMENT TEMP.SENSOR
TERMINAL BOARD 2-6 TERMINAL BOARD 1 COMP.CRANK CASE HEATER
IN/OUT PIPE TEMP. SENSOR E
COMPONENT POSITION DIAGRAM
15K 50K
DISCHARGE GAS TEMP.SENSOR
INDOOR UNIT A
N(1)
2 3
PE
INDOOR UNIT E
N(1)
2
3
PE
INDOOR UNIT D
N(1)
2
3
PE
INDOOR UNIT C
N(1)
2
3
PE
INDOOR UNIT B
N(1)
2
3
PE
These circuit diagrams are subject to change without notice, please refer to the one supplied with the unit.