Gree GWHD24NK3FO Service Manual
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Gree GWHD24NK3FO Service Manual

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

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Summary of Contents for Gree GWHD24NK3FO

  • Page 1 Change for Life Service Manual Models: GWHD(18)NK3FO GWHD(24)NK3FO GWHD(24)NK3GO GWHD(28)NK3FO GWHD(36)NK3BO GWHD(42)NK3AO GWHD(42)NK3BO (Refrigerant R410A) GREE ELECTRIC APPLIANCES,INC.OF ZHUHAI...

  • Page 2: Table Of Contents

    Service Manual Table of Contents ...............1 Part : Technical Information ........................1 1. Summary ......................2  6SHFL¿FDWLRQV ..............10 3. Outline Dimension Diagram ..............12 4. Refrigerant System Diagram ......................14 5. Electrical Part 5.1 Wiring Diagram ..................14 5.2 PCB Printed Diagram................21 ..................25 6.

  • Page 3: Part : Technical Information

    Service Manual Part Ⅰ : Technical Information 1. Summary Outdoor Unit GWHD(18)NK3FO GWHD(24)NK3FO GWHD(24)NK3GO GWHD(28) NK3FO GWHD(36)NK3BO GWHD(42)NK3AO GWHD(42)NK3BO Technical Information...

  • Page 4: 6Shfl¿Fdwlrqv

    Service Manual 2. Specifications Model GWHD(18)NK3FO Product Code CB228W03500/CB228W03501 Rated Voltage 220-240V Power Rated Frequency supply Phases Cooling capacity(max~min) 5000(2050~6200) Heating capacity(max~min) 5600(2500~6650) Cooling Power Input(max~min) 1550(500~2550) Heating Power Input(max~min) 1550(580~2700) Cooling Current Input 6.88 Heating Current Input 6.88 Rated Power Input 2700 Rated Current 11.98...
  • Page 5 Cross-sectional Area of Power Cable Conductor 2.50 Recommended Power Cable(Core) Connection Pipe Connection Method Flare Connection Not Additional Gas Connection Pipe Length Connection Pipe Gas Additional Charge Outer Diameter of Liquid Pipe(GREE Allocation) Φ6 (Metric) Outdoor Outer Diameter of Gas Pipe(GREE Allocation) Unit Φ9.52 (Metric) Connection Pipe Max.
  • Page 6 Service Manual Model GWHD(24)NK3FO GWHD(24)NK3GO Product Code CB228W03301 CB228W03401/CB228W03400 Rated Voltage 220-240V 220-240V Power Rated Frequency supply Phases Cooling capacity(max~min) 7000(2200~10000) 7100(2200~10000) Heating capacity(max~min) 7700(2600~11000) 8500(3600~11000) Cooling Power Input(max~min) 2460(650~4550) 2400(650~4550) Heating Power Input(max~min) 2560(980~3950) 2350(980~3950) Cooling Current Input 10.91 10.91 Heating Current Input 11.36...
  • Page 7 2.50 Recommended Power Cable(Core) Connection Pipe Connection Method Flare Connection Flare Connection Not Additional Gas Connection Pipe Length Connection Pipe Gas Additional Charge Outer Diameter of Liquid Pipe(GREE Allocation) Φ6 Φ6 (Metric) Outdoor Outer Diameter of Gas Pipe(GREE Allocation) Unit Φ9.52...
  • Page 8 Service Manual Model GWHD(28)NK3FO Product Code CB228W03600/CB228W03601 Rated Voltage 220-240V Power Rated Frequency supply Phases Cooling capacity(max~min) 8000(2200~10000) Heating capacity(max~min) 9300(2800~11000) Cooling Power Input(max~min) 2490(650~4550) Heating Power Input(max~min) 2580(980~3950) Cooling Current Input 11.05 Heating Current Input 11.45 Rated Power Input 4550 Rated Current 20.19...
  • Page 9 Cross-sectional Area of Power Cable Conductor 2.50 Recommended Power Cable(Core) Connection Pipe Connection Method Flare Connection Not Additional Gas Connection Pipe Length Connection Pipe Gas Additional Charge Outer Diameter of Liquid Pipe(GREE Allocation) Φ6 (Metric) Outdoor Outer Diameter of Gas Pipe(GREE Allocation) Unit Φ9.52 (Metric) Connection Pipe Max.
  • Page 10 Service Manual Model GWHD(36)NK3BO GWHD(42)NK3AO GWHD(42)NK3BO Product Code CN860W0131 CN860W0021 CN860W0270 Rated Voltage 220-240V 220-240V 220-240V Power Rated Frequency supply Phases Cooling capacity(max~min) 10500(2100~11000) 12100(2100~13600) 12100(2100~13600) Heating capacity(max~min) 12000(2600~13000) 13000(2600~14000) 13000(2600~14000) Cooling Power Input 3500 3590 3760 Heating Power Input 3750 3550 3450...
  • Page 11 Method Not Additional Gas Connection Pipe Length Connection Pipe Gas Additional Charge Outer Diameter of Liquid Φ6 Φ6 Φ6 Pipe(GREE Allocation)(Metric)1 Outer Diameter of Gas Pipe(GREE Φ9.52 Φ9.52 Φ9.52 Allocation)(Metric)1 Outer Diameter of Liquid Φ6 Φ6 Φ6 Pipe(GREE Allocation)(Metric)2 Outer Diameter of Gas Pipe(GREE Outdoor Φ9.52...

  • Page 12: Outline Dimension Diagram

    Service Manual 3. Outline Dimension Diagram (1)Model:GWHD(18)NK3FO (2)Models:GWHD(24)NK3FO GWHD(24)NK3GO GWHD(28) NK3FO 1001 Unit:mm Technical Information...
  • Page 13 Service Manual (3)Model:GWHD(36)NK3BO 1015 1022 1087 Unit:mm Unit:mm (4)Model:GWHD(42)NK3AO GWHD(42)NK3BO 1015 1087 Unit:mm Technical Information...

  • Page 14: Refrigerant System Diagram

    Service Manual 4. Refrigerant System Diagram Models:GWHD(18)NK3FO GWHD(24)NK3FO GWHD(24)NK3GO GWHD(28) NK3FO outdoor indoor filter A heat exchanger filter outdoor heat exchanger 4-way valve B heat exchanger filter high pressure switch Note: Not available for 14K/18K model discharge silencer C heat exchanger discharge temperature sensor filter...
  • Page 15 Service Manual Models:GWHD(36)NK3BO,GWHD(42)NK3AO,GWHD(42)NK3BO Heat Exchanger Liquid Receiver Four-way Valve Capillary Oil Separator Outdoor Unit Stop Valve Compressor Gas/Liquid Separator Electronic Expansion Valve Heating Cooling Indoor Unit Heat Exchanger Heat Exchanger Heat Exchanger Heat Exchanger Heat Exchanger 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...

  • Page 16: Electrical Part

    Service Manual 5. Electrical Part 5.1 Wiring Diagram ●Instruction Symbol Symbol Color Symbol Symbol Color Symbol Name White GREEN COMP Compressor Yellow Brown Grouding wire Blue YEGN Yellow/Green Black Violet Orange ● Outdoor Unit (1)Model:GWHD(18)NK3FO(CB228W03501) Technical Information...
  • Page 17 Service Manual (2)Model:GWHD(18)NK3FO(CB228W03500) (3)Model:GWHD(24)NK3FO AC-L E(PE) HPS P LX2-2 LX2-1 COMP CONNECTOR TUBE-A TUBE-B 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! Technical Information...
  • Page 18 Service Manual (4)Model:GWHD(24)NK3GO(CB228W03401) AC-L LX2-2 LX2-1 COMP CONNECTOR 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! (5)Model:GWHD(24)NK3GO(CB228W03400) Technical Information...
  • Page 19 Service Manual (6)Model:GWHD(28) NK3FO(CB228W03601)(CB228W03600) AC-L E(PE) LX2-2 LX2-1 COMP CONNECTOR Technical Information...
  • Page 20 Service Manual (7)Model:GWHD(36)NK3BO Technical Information...
  • Page 21 Service Manual (8) Model:GWHD(42)NK3AO Technical Information...
  • Page 22 Service Manual (9) Model:GWHD(42)NK3BO These circuit diagrams are subject to change without notice, please refer to the one supplied with the unit. Technical Information...

  • Page 23: Pcb Printed Diagram

    Service Manual 5.2 PCB Printed Diagram (1)Model:GWHD(18)NK3FO Terminal of compressor Terminal of low- ● Top view temperature cooling temperature sensor Overload protection terminal of compressor Terminal of temperature sensor for outdoor unit High-pressure protection terminal Low-pressure protection terminal Terminal of outdoor fan Electric heating terminal of chassis 4-way valve terminal...
  • Page 24 Service Manual (2)Models:GWHD(24)NK3FO GWHD(24)NK3GO GWHD(28) NK3FO ● Top view Compressor terminal Temperature sensor of liquid valve and gas valve for unit D Low-pressure protection terminal Electronic expansion valve for unit A High-pressure protection terminal Electronic expansion valve for unit B Overload protection terminal of compressor Electronic expansion valve for unit C Terminal of temperature sensor of outdoor unit...
  • Page 25 Service Manual (3)Model:GWHD(36)NK3BO GWHD(42)NK3BO ● Top view 11 Communication interface between indoor unit Terminal of expansion valve and outdoor unit G-MatrikII chip 12 PTC resistance Jumper cap 13 Piezoresistor Terminal of temperature sensor 14 DC fan terminal STM8S207 chip 15 Relay Overload protection terminal of compressor 16 Common-mode induction Low-pressure protection terminal...
  • Page 26 Service Manual (4)Model:GWHD(42)NK3AO Top view FA-FE: Teminals of EXV(Electronic expansion Valve) JUMP2:the code of capcity SA1: Master select switch T-SENSOR2:Teminals of temperature sensor TUBE-A - TUBE- E:Teminals of tube temperature sensor OVC-COMP:Teminals of overload protector LPP:Teminals of low pressure switch HPP:Teminals of high pressure switch 4V1:Teminals of 4-way...

  • Page 27: Function And Control

    Service Manual 6. Function and Control For 18/24/28K 1 Basic functions of the system 1.1 Cooling Mode 1.1.1 Cooling conditions and process: If the compressor is in stop status and start the unit for cooling operation, when one of the indoor units reaches the cooling operation condition, the unit start cooling operation;...
  • Page 28 Service Manual 1.3.3 Outdoor fan control in heating mode The outdoor fan starts before 5s of the starting of compressor and then it will run in high speed for 40s; The fan shall run at every speed for at least 80s; When the compressor stops, the outdoor fan stops after 1min.
  • Page 29 Service Manual 2.4 Communication malfunction Detection of the quantity of installed indoor units: After 3min of energizing, if the outdoor unit does not receive the communication data of certain indoor unit, the outdoor unit will judge that indoor unit is not installed and will treat it as it is not installed. If the outdoor unit receives the communication data of that indoor unit later, the outdoor unit will treat that unit as it is installed.
  • Page 30 Service Manual For 36K/42K 1.Function Control 1) Cooling mode a. Turning on the unit for cooling operation, and if any one of the indoor units satisfy the cooling operation condition, the system will start for cooling operation; and the electronic expansion valve, the outdoor fan and the compressor start operation. b.
  • Page 31 Service Manual Detection of the quantity of installed indoor units: after 3min of energizing, if the outdoor unit does not receive the communication data of certain indoor unit, the outdoor unit will judge that indoor unit is not installed. If the outdoor unit receives the communication data of that indoor unit later, the communication malfunction will be cleared.

  • Page 32: Installation And Maintenance

    Service Manual Part Ⅱ : Installation and Maintenance 7. Notes for Installation and Maintenance Safety Precautions: 10. If the power cord or connection wire is not long enough, please get the specialized power cord or connection wire Important! from the manufacture or distributor. Prohibit prolong the wire by yourself.
  • Page 33 Service Manual Main Tools for Installation and Maintenance 1. Level meter, measuring tape 2. Screw driver 3. Impact drill, drill head, electric drill 4. Electroprobe 5. Universal meter 6. Torque wrench, open-end wrench, inner hexagon spanner 7. Electronic leakage detector 8.

  • Page 34: Installation Manual

    Service Manual 8. Installation Manual Installation procedures Start installation Preparation before installation Read the requirements select installation Prepare tools for electric connection location Select indoor unit Select outdoor unit installation location installation location Install wall-mounting Install the support of outdoor unit (select it according to the actual situation) frame, drill wall holes Connect pipes of indoor...

  • Page 35: Electrical Connections

    Service Manual 8.1 Electrical Connections GWHD(18)NK3FO GWHD(18)NK3FO GWHD(24)NK3FO 1. Remove the handle at the right side plate of the outdoor unit (one screw). 2. Remove the cable clamp, connect the power connection cable with the terminal at the row of connection and fix the Front Grill connection.
  • Page 36 Service Manual GWHD(24)NK3GO 1. Remove the handle at the right side plate of the outdoor unit An all-pole disconnection switch having a contact (one screw). separation of at least 3mm in all pole should be connected in fixed wiring. 2. Remove the cable clamp, connect the power connection cable with the terminal at the row of connection and fix the connection.
  • Page 37 Service Manual GWHD(28) NK3FO 1. Remove the handle at the right side plate of the outdoor unit An all-pole disconnection switch having a contact (one screw). separation of at least 3mm in all pole should be connected in fixed wiring. 2.

  • Page 38: Installing The Outdoor Unit

    Service Manual 8.2 Installing the Outdoor Unit Use bolts to secure the unit to a flat, solid floor. Installthedrainfittingandthedrainhose(for When mounting the unit on a wall or the roof, make modelwithheatpumponly) sure the support is firmly secured so that it cannot Condensation is produced and flows from the outdoor unit move in the event of intense vibrations or a strong when the appliance is operating in the heating mode.

  • Page 39: Installation Dimension Diagram

    Service Manual 8.3 Installation Dimension Diagram Use suitable instruments for the refrigerant R410A. ● Do not use any other refrigerant than R410A. Do not use mineral oils to clean the unit. The installation must be done by trained and qualified service personnel with reliability according to this manual. Contact service center before installation to avoid the malfunction due to unprofessional installation.

  • Page 40: Check After Installation

    Service Manual 8.4 Check after Installation Check Items Problems Owing to Improper Installation Is the installation reliable? The unit may drop, vibrate or make noises May cause unsatisfactory cooling (heating) Has the gas leakage been checked? effect Is the thermal insulation of the unit May cause condensation and water dropping sufficient? May cause condensation and water dropping...
  • Page 41 Service Manual 36K and 42K Safety Precautions Please read this manual carefully before using and operating correctly as instructed in this manual. Please especially take notice of the following two symbols: Warning! It indicates improper operation which will lead to human casualty or severe injury. Caution! It indicates improper operation which will lead to injury or property damage.
  • Page 42 CAUTION The unit installed in the following places is likely to run abnormally. If unavoidable, please contact the professional personnel at the GREE appointed service center. where is full of oil; alkaline soil off the sea;...
  • Page 43 Service Manual Table 1 Recommended Cord Capacity of the pieces× Models Power Supply Air Switch sectional area 36/42K 220-240V~ 50Hz ×3 Earthing Requirements the tapping screw; otherwise it would cause the hazard of electric shock. 3) The reliable earth terminal should be provided and the earth wire can not be connected to any of the following places. Running water pipe;...
  • Page 44 Service Manual Noise Precautions 1) The air conditioning unit should be installed where ventilation is in good condition, otherwise the working capability of the unit would be reduced or working noise would be increased. 2) The air conditioning unit should be installed on the base frame which is stable and secure uncouth to withstand the weight of the unit;...
  • Page 45 Service Manual 2) During the transportation of the outdoor unit, two lifting ropes long enough must be used in four directions and the included angle must be less than 40°prevent the center of unit deviating. 4) The unit should be installed on a concrete base frame with a height of 10cm. 5) The installation space of the unit should be as required in Fig.5.
  • Page 46 Service Manual Table 3 Allowable Length Refrigerant Pipe Total Length(m) Max. Length for Single Unit(m) Outdoor unit Max. and indoor unit installation Indoor unit altitude and indoor unit Table 4: Dimension of the Refrigerant Pipe of the Indoor Unit unit mm Capacity Level of the Indoor Unit Gas Pipe Liquid Pipe...
  • Page 47 Service Manual CAUTION! During the connection of the indoor unit and the refrigerant pipe, never pull any joints of the indoor unit by force; otherwise the capillary pipe or other pipe may crack, which then would result in leakage. The refrigerant pipe should be supported by brackets, that is, don’t let the unit withstand the weight of it. CAUTION! For the Free match system, each pipe should be labeled to tell which system it belongs to avoid mistaken inaccurate piping.
  • Page 48 Service Manual 4) Make sure the system has no leakage. When compressor is not working, fill a set amount of R410a refrigerant into the unit through outdoor unit’s liquid valve. If the inner tube pressure rises and the set amount of refrigerant can’t be filled inside quickly, you can turn on the unit to make it start cooling, then fill the refrigerant inside through outdoor unit’s gas valve.
  • Page 49 Service Manual 4) Additional Refrigerant Charge Record Table 10 Indoor Unit Indoor Unit Model Additional Refrigerant Charge(kg) …… Total Table 11 Refrigerant Pipe Diameter Total Length(m) Additional Refrigerant Charge(kg) Φ15.9 Φ12.7 Φ9.52 Φ6.35 Total c. Items to be checked after the Installation Table 12 Check Items to be Checked...

  • Page 50: Maintenance

    Service Manual 9. Maintenance 9.1 Precautions before Performing Inspection or Repair There are high-capacity electrolytic capacitors on the outdoor mainboard. Thus, even the power is cut off, there is high voltage inside the capacitors and it needs more than 20min to reduce the voltage to safety value. Touching the electrolytic capacitor within 20min after cutting the power will cause electric shock.

  • Page 51: Flashing Led Of Indoor/Outdoor Unit And Primary Judgement

    Service Manual 9.2 Flashing LED of Indoor/Outdoor Unit and Primary Judgement 1. Requirement of malfunction display When several malfunctions happen at the same time, malfunction codes will be displayed circularly. 2. Malfunction display method (1) Hardware malfunction: it will be displayed immediately, please refer to “Malfunction status sheet”; (2) Operation status: it will be displayed immediately, please refer to “Malfunction status sheet”;...

  • Page 52: Malfunction Checking And Elimination

    Communication failure with Unit D Communication failure with Unit D Unit A freeze protection Unit A freeze protection Service Manual Unit B freeze protection Unit B freeze protection Unit C freeze protection Unit C freeze protection Unit D freeze protection Unit D freeze protection overheating prevention protection Unit A...
  • Page 53 Service Manual Energize the unit Please check: 1. if the indoor and outdoor heat exchanges are dirty, if there is obstacle to affect the radiation; 2. if the indoor and outdoor fans are running If the above cases are existed? normally;...
  • Page 54 Service Manual 2. PFC protection malfunction, capacity charging malfunction Main checking points: If the wiring of the induction is connected well and if the induction is broken; If the mainboard is broken; Flow chart: Start Check if power supply is normal Turn on the unit after power supply Power supply is abnormal?
  • Page 55 Service Manual Start Check If the power supply is normal Turn on the unit after the power supply resumes to Power supply is abnormal normal situation Check if the outdoor induction is broken Malfunction is eliminated Replace the outdoor mainboard Installation and Maintenance...
  • Page 56 Service Manual 3. Compressor desynchronizing malfunction Main checking points: If the pressure of the system is too high; If the eletric expansion valve is working normally or it is broken; If the radiation of the unit is good; Flow chart: The unit appears desynchronizing as soon as energizing and starting The stop duration of the compressor is longer...
  • Page 57 Service Manual Desynchronizing happens during operation Check if fan Replace the fan capacitor Outdoor unit is working? terminal is connected well Improve radiation situation of the unit Unit radiation is good? (such as cleaning Replace the outdoor unit the heat exchanger, improve ventilation Turn on the unit after the power...
  • Page 58 Service Manual 4. Compressor overload, diacharge protectionmalfunction Main checking points: If the eletric expansion valve is connected well or it is broken; If there is refrigerant leakage; If the overload protector is broken; Flow chart: Start If the overload protector is connected well? Check the resistance between the two ends of the overload protector in ambient temperature, if the resistance is below 1k...
  • Page 59 Service Manual 5. Start failuremalfunction Main checking points: If the connection wire of the compressor is connected properly; If the stop duration of the compressor is sufficient; If the compressor is broken; If the refrigerant charging amount is too much; Flow chart: Energize and start the unit...
  • Page 60 Service Manual 6. Temperature sensor malfunction Main checking points: If the temperature sensor is damaged or broken If the terminal of the temperature sensor is loosended or not connected; If the mainboard is broken; Flow chart: Start Check whether the wiring terminal between temperature sensor and controller is loosened or poorly contacted? Insert the temperature...
  • Page 61 Service Manual 7. DC fan malfunction Main checking points: If the outdoor fan is blocked by foreign objects; The connection wire of DC fan is connected reliably? If it is loose? Flow chart: Start Turn on the unit Check if the after removing the outdoor fan is blocked by foreign objects...
  • Page 62 Service Manual 8. Communication malfunction Main checking points: If the connection wire between the indoor unit and outdoor unit is connected well, if the wires inside the unit is connected well; If the indoor mainboard or outdoor main board is broken; Flow chart: Communication malfunction of some indoor units...
  • Page 63 Service Manual All the indoor units appear communication malfunction De-energize,check if the connection wire of indoor and outdoor unit and the wire of the eletric box is connected correctly Reconnect according to Eliminate the malfunction Connected correctly? the wiring diagram De-energize, check if the connection wire between the outdoor mainboard and the filter board according to the wiring diagram...
  • Page 64 Service Manual 9. Anti-high temperatureand overload malfunction Main checking points: If the outdoor ambient temperature is within the normal range; If the indoor fan and outdoor fan are running normally; If the indoor and outdoor radiation environment is good; Flow chart: Start It is a normal protection, please If the outdoor ambient temperature...
  • Page 65 (like, stinky smell), please shut off the main power supply immediately and then contact the GREE appointed service center; otherwise the continuous abnormal running would damage the air conditioning b.Do not repair the air conditioning personally but instead contact the professionally skilled personnel at the GREE 1.1 Check before Contacting Service Center Please check the following items before contacting the maintenance serviceman.
  • Page 66 Service Manual 1.3 Error Description If some error occurs when the unit is running, the error code will be displayed on the wired controller and the main board the outdoor unit.See the table before for more details about the meaning of each error. Indicating LED Flashing Times Outdoor Wired...
  • Page 67 Service Manual AC Contactor Flash 3 times Flash 3 times Flash 3 times Drive Error Protection Flash 12 Current Sensor Error Drive Error times Sensor Connection Flash 3 times Flash 3 times Flash 3 times Drive Error Protection Over Voltage Flash 11 times Drive Error Protection...
  • Page 68 Service Manual High Discharge Temp Flash 4 times Outdoor Protection Outdoor & Communication Error Flash 6 times Indoor Indoor Unit Water Full Flash 9 times Indoor Error Refrigerant Recovery Special Flash once Flash once Mode Mode Outdoor Ambient Temp Flash 3 times Outdoor Sensor Error Outdoor Mid-Coil Temp...
  • Page 69 Service Manual Temp Drift Protection Drive Error Drive Board Ambient Drive Error Temp Sensor Error Charging Circuit Error Flash 17 times Drive Error Unit n communication Flash 6 times Indoor error Table 16 Unit n indoor pipe midway temperature Flash twice Indoor Table 16 sensor error...
  • Page 70 1.4 After-Sales Service If there is any quality or other issue, place contact the GREE after-sales service center. utdoor Unit: GWHD(36)NK3BO,GWHD(42)NK3AO Note: Refer to the real products for the exact position of each compone ors are displayed on the controller, please shut off the air conditioning nally skilled personnel for troubleshooting.
  • Page 71 Service Manual 2. Flow Chart of Troubleshooing Service personnel shall collect the malfunction information as much as possible and research them thoroughly, list solve the faulted parts. Observe the status of the complete device and do not observe the partial It is advised to start from the simple operation during analyzing ,judging and confirming malfunction reason, then Find the malfunction reason carefully as unit may occur several malfunction at the same time and one malfunction may develop into several malfunction, so entire system analysis shall be established to make the judged result exact and...
  • Page 72 Service Manual Malfunction display: E3 Compressor Low Pressure Protection Compressor Low Pressure Protection Check if the pressure is really low pressure Refer to the high pressure with the measurement of a manometer protection Charge refrigerant according to the amount Check if the refrigerant in the specified in the nameplate and calculated system is sufficient additional amount...
  • Page 73 Service Manual Malfunction display: E4 Compressor Exhaust High Temperature Protection Discharge temperature protection Measure if temperature sensor’s Measure if compressor’s discharge Replace relevant discharge resistance value is correct temperature has reached 115℃ temperature sensor System pipeline leaks so complementation is needed. Replace the outdoor Please add refrigerant according to the amount unit mainboard...
  • Page 74 Service Manual Malfunction display: E9 Full Water Protection Full Water Protection Check if the voltage of liquid Check if water overflow Replace the main board of level switch end is ok the indoor uint Check the liquid level switch Check if the water drainage Replace the main board of Check if the voltage of water pump works...
  • Page 75 Service Manual Malfunction display: F3 Failure of Outdoor Ambient Sensor Failure of outdoor Ambient sensor Check if the plug of the temperature sensor is correctly Check the direction of the plug connected with socket on the mainboard and socket Remove the sensor to check if the resistance value is ok Replace temperature sensor Replace mainboard of the outdoor uint Malfunction display: F5 Failure of Exhaust Temp.

  • Page 76: Maintenance Method For Normal Malfunction

    Service Manual 9.4 Maintenance Method for Normal Malfunction 1. Air Conditioner Can't be Started Up Possible Causes Discriminating Method (Air conditioner Status) Troubleshooting Confirm whether it's due to power failure. If yes, No power supply, or poor After energization, operation indicator isn’t bright wait for power recovery.
  • Page 77 Service Manual 4. ODU Fan Motor Can't Operate Possible causes Discriminating method (air conditioner status) Troubleshooting Connect wires according to wiring diagram to Wrong wire connection, or poor Check the wiring status according to circuit make sure all wiring terminals are connected connection diagram firmly...

  • Page 78: Exploded View And Parts List

    Service Manual 10. Exploded View and Parts List (1) Model:GWHD(18)NK3FO Installation and Maintenance...
  • Page 79 Service Manual Part Code Description GWHD(18)NK3FO GWHD(18)NK3FO Product Code CB228W03501 CB228W03500 Front Grill 22413025 22413025 Front Panel 01535013P 01535013P Chassis Sub-assy 02803263P 02803302P Drainage Connecter 06123401 06123401 Drainage hole Cap 06813401 06813401 Gas-liquid Separator Assy 07225017 07225017 Compressor and Fittings 00105249G 00105249G Electric Heater(Compressor)
  • Page 80 Service Manual (2) Model:GWHD(24)NK3FO Installation and Maintenance...
  • Page 81 Service Manual Part Code Description GWHD(24)NK3FO Product Code CB228W03301 Front Grill 22413026 Cabinet 01435004P Left Handle 26235401 Front Side Plate 01305086P Electrical Heater (Chassis) 7651000411 Drainage Connecter 06123401 Chassis Sub-assy 02803280P Gas-liquid Separator Assy 07225017 Compressor and Fittings 0010524501G Electric Heater(Compressor) 7651873215 Tube Connector Sub-assy 06643008...
  • Page 82 Service Manual (3) Model:GWHD(24)NK3GO Installation and Maintenance...
  • Page 83 Service Manual Part Code Description GWHD(24)NK3GO Product Code CB228W03401 CB228W03400 Front Grill 22413026 22413026 Cabinet 01435004P 01435004P Left Handle 26235401 26235401 Front Side Plate 01305086P 01305086P Electrical Heater (Chassis) 7651000411 Drainage Connecter 06123401 06123401 Chassis Sub-assy 02803280P 0280328001P Gas-liquid Separator Assy 07225017 07225017 Compressor and Fittings...
  • Page 84 Service Manual (4) Model:GWHD(28) NK3FO Installation and Maintenance...
  • Page 85 Service Manual Part Code Description GWHD(28) NK3FO GWHD(28) NK3FO Product Code CB228W03601 CB228W03600 Front Grill 22413026 22413026 Cabinet 01435004P 01435004P Left Handle 26235401 26235401 Front Side Plate 01305086P 01305086P Electrical Heater (Chassis) 7651000411 Drainage Connecter 06123401 06123401 Chassis Sub-assy 02803280P 02803301P Gas-liquid Separator Assy 07225017...
  • Page 86 Service Manual (5) Models:GWHD(36)NK3BO(CN860W0131) GWHD(42)NK3AO(CN860W0021) GWHD(42)NK3BO(CN860W0270) Installation and Maintenance...
  • Page 87 Service Manual Part Code Description GWHD(36)NK3BO GWHD(42)NK3AO GWHD(42)NK3BO CN860W0270 Product code CN860W0131 CN860W0021 22415005 Front Grill 22415005 22415005 01435007P Cabinet 01435007P 01435007P 01305508 Front Side Plate Sub-Assy 01305508 01305508 39008000055G Sensor sub-assy 39008000055G 39008066 01194141P Chassis Sub-assy 01194141P 01194141P 01425200068 Insulated board (cover of electric box) 01425200068 20113003...
  • Page 88 Service Manual 01395200266 Electric Box Assy 01395200266 02404113 01804100229 Motor Support Sub-Assy 01804100229 01804100382 01305064P Left Side Plate 01305064P 01305064P 01895309 Condenser support plate 01895309 01895309 01244141 Clapboard 01244141 01244141 Fan Motor 1570280201 1570522801 1570280201 Axial Flow Fan 10335010 10335010 10335010 Above data is subject to change without notice.

  • Page 89: Removal Procedure

    Service Manual 11. Removal Procedure Warning: Be sure to wait for a minimum of 20 minutes after turning off all power supplies and discharge the refrigerant completely before removal. (1)Model:GWHD(18)NK3FO Steps Procedure 1. Before disassembly Complete axonometric drawing. 2. Remove valve cover valve cover Remove the connection screw fixing the valve cover and then remove the valve cover.
  • Page 90 Service Manual Step rocedure 4. Remove front grille Remove the connection screws connecting the front grille and the front panel, and then loosen the clasp to remove the front grille. grille 5. Remove front panel Remove the screws connecting the front panel and then remove the front panel.
  • Page 91 Service Manual Step rocedure 7. Remove rear grill rear grill Remove the screws connecting the rear grill and the left side plate, and then remove the rear grill. 8. Remove left side plate Remove the screws fixing the left side plate with the chassis and the condenser support, and then remove the left side plate.
  • Page 92 Service Manual Step rocedure 10. Remove axial flow blade Remove the nut on the blade and then remove the axial flow blade. axial flow blade 11. Remove motor and motor support Remove the 4 tapping screws fixing the motor and disconnect the leading wire insert of the motor.
  • Page 93 Service Manual Step rocedure 13. Remove PFC induction Remove the screw connecting the PFC induction and middle isolation sheet, and then remove the PFC induction PFC induction 14. Remove 4-way valve assy and suction pipe sub-assy 4-way valve assy Unsolder the welding joint connecting the 4-way valve assy with compressor suction and discharge port, the valve with the outlet pipe of condenser.
  • Page 94 Service Manual Step rocedure 16. Remove middle isolation sheet Remove the screws connecting the middle isolation sheet with the chassis assy and the condenser assy, and then remove the middle isolation sheet. middle isolation sheet 17. Remove compressor compressor Remove the 3 foot nuts fixing the compressor and then remove the compressor.
  • Page 95 Service Manual Step rocedure 19. Remove electronic expansion valve assy Unsolder the welding joint connecting the electronic expansion valve sub-assy with the gas collection pipe, and then remove the electronic expansion valve assy. (Note: when unsoldering, wrap the gas valve with a wet cloth completely to avoid damage to the valve caused by high temperature).
  • Page 96 Service Manual (2)Models:GWHD(24)NK3FO GWHD(24)NK3GO GWHD(28) NK3FO Take GWHD(28) NK3FO for example(Only cut-off valve of valve support, electronic expansion valve and coil have some differences) Steps Procedure 1. Remove valve cover and top panel valve cover Twist off the screws used for fixing and valve cover , pull v alve cover up ward to remove it.
  • Page 97 Service Manual Remove the 5 screws connecting the panel with the chassis and the motor support, and then remove the panel. panel 3. Remove right side plate and left side plate right side plate Remove the scre ws connecting the right side plate with the chassis, the valve support and the electric box, and then remove the right side plate assy .
  • Page 98 Service Manual 4. Remove fan motor and axial flow blade axial flow blade Remove the nuts fixing the blade and then remove the axial flow blade. fan motor fixing frame Remove the 4 tapping screws fixing the motor; disconnect the leading wire insert of the motor and then remove the motor.
  • Page 99 Service Manual 4-way valv e assy 6.Remove soundproof sponge and soundproof sponge Since the piping ports on the soundproof sponge are torn easily, remove the soundproof sponge carefully 4-way valv e assy Discharge the refrigerant completely;unsolder the pipelines connecting the compressor and the condenser assy,and then remove the 4-way valve assy.
  • Page 100 Service Manual 8. Remov e Cut off Valve and Valve Support Remove the 2 bolts fixing the valve subassemblies. Unsolder the welding joint connecting the gas valve and the return air pipe. Remove the gas valve. (Note: When unsoldering the soldering joint, wrap the gas valve with wet cloth completely to avoid damage to the valve caused by high temperature.) valve support...
  • Page 101 Service Manual condenser sub-assy 11.Remove condenser sub-assy Remove the chassis sub-assy and condenser sub-assy. chassis sub-assy Installation and Maintenance...
  • Page 102 Service Manual (3) Models: GWHD(36)NK3BO,GWHD(42)NK3AO , GWHD(42)NK3BO Disassembly and Assembly of Outer Casing Steps Procedure 1. Disassemble the cover plate ① Remove the fixed screws on the cover plate by using a screwdriver. ② Remove the cover plate. 2. Disassemble the front panel ①...
  • Page 103 Service Manual Steps Procedure 4. Dismount the grille ① Remove the fixed screws on the grille by using a screwdriver. ② Remove the grille. 5. Disassemble the outer casing ① Remove the fixed screws on the outer casing by using a screwdriver. ②...
  • Page 104 Service Manual Steps Procedure 7． Assemble the disassembled main parts as per the reverse disassembly order mentioned above Assemble the disassembled main parts as per the reverse disassembly order mentioned above and energize the unit for trial test. Disassembly and Assembly of Compressor Remark: Make sure that there is no refrigerant in pipe system and the power supply is cut off before disassembling the compress or.
  • Page 105 Service Manual Steps Procedure 3. Take down the bad compressor ① Remove the bolts on the compressor by using a tool. ② Take down the bad compressor from the bottom plate. 4. Place the new compressor on the bottom plate and connect the suction inlet and discharge outlet with the pipe system ①...
  • Page 106 Service Manual Steps Procedure 2. Disconnect the 4-way valve and the connected pipe by soldering. Take down the bad 4-way valve. Disconnect the 4-way valve and the connected pipe by a welding gun. Take down the bad 4-way valve. 3. Replace the 4-way valve and reconnect it with the pipeline. ①...
  • Page 107 Service Manual Disassembly and Assembly of Electronic Expansion Valve Steps Procedure 1. Remove the electronic expansion valve coil Remove the electronic expansion valve coil by rotating it until the lock is unfixed. 2． Disconnect the electronic expansion valve and the connected pipe by soldering Disconnect the electronic expansion valve and the connected pipe by a welding gun.
  • Page 108 Service Manual Disassembly and Assembly of Vapour Liquid Separator Steps Procedure 1. Disconnect the liquid separator and the connected pipeline Disconnect the liquid separator and the connected pipeline. 2. Remove the liquid separator ① Remove the bolt fixing the liquid separator by a tool. ②...

  • Page 109: Appendix

    Service Manual Appendix: Appendix 1: Reference Sheet of Celsius and Fahrenheit Conversion formula for Fahrenheit degree and Celsius degree: Tf=Tcx1.8+32 Set temperature Fahrenheit Fahrenheit Fahrenheit display Fahrenheit display Fahrenheit display Fahrenheit Celsius （℃） Celsius （℃） Celsius （℃） （℉） （℉） （℉） temperature temperature temperature...

  • Page 110: Appendix 3: Pipe Expanding Method

    Service Manual Appendix 3: Pipe Expanding Method Pipe Note: Pipe cutter Improper pipe expanding is the main cause of refrigerant leakage.Please expand the pipe according to the following steps: Leaning Uneven Burr A:Cut the pip ● Confirm the pipe length according to the distance of indoor unit and outdoor unit. ●...

  • Page 111: Appendix 4: List Of Resistance For Temperature Sensor

    Service Manual Appendix 4: List of Resistance for Temperature Sensor Resistance Table of Ambient Temperature Sensor for Indoor and Outdoor Units(15K) C) Resistance(kΩ) C) Resistance(kΩ) Resistance(kΩ) Resistance(kΩ) Temp( Temp( Temp( Temp( 138.1 18.75 3.848 1.071 128.6 17.93 3.711 1.039 121.6 17.14 3.579 1.009...
  • Page 112 Service Manual Resistance Table of Tube Temperature Sensors for Indoor and Outdoor (20K) C) Resistance(kΩ) C) Resistance(kΩ) Resistance(kΩ) Resistance(kΩ) Temp( Temp( Temp( Temp( 181.4 25.01 5.13 1.427 171.4 23.9 4.948 1.386 162.1 22.85 4.773 1.346 153.3 21.85 4.605 1.307 20.9 4.443 1.269 137.2...
  • Page 113 Service Manual Resistance Table of Discharge Temperature Sensor for Outdoor(50K) C) Resistance(kΩ) Resistance(kΩ) C) Resistance(kΩ) Resistance(kΩ) Temp( Temp( Temp( Temp( 853.5 18.34 4.75 799.8 93.42 17.65 4.61 89.07 16.99 4.47 703.8 84.95 16.36 4.33 660.8 81.05 15.75 4.20 620.8 77.35 15.17 4.08 580.6...
  • Page 114 GREE ELECTRIC APPLIANCES,INC.OF ZHUHAI Add: West Jinji Rd, Qianshan, Zhuhai, Guangdong, China 519070 Tel: (+86-756) 8522218 Fax: (+86-756) 8669426 Email: gree@gree.com.cn Http://www.gree.com HONG KONG GREE ELECTRIC APPLIANCES SALES LIMITED Add: Unit 2612,26/F.,Miramar Tower 132 Nathan Road,TST,Kowloon,HK Tel: (852) 31658898 Fax: (852) 31651029...

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