Gree gwhd(18)nk3fo Service Manual
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Gree gwhd(18)nk3fo Service Manual

Refrigerant: r410a
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Change for Life

Service Manual

GREE ELECTRIC APPLIANCES,INC.OF ZHUHAI

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Summary of Contents for Gree gwhd(18)nk3fo

  • Page 1: Service Manual

    Change for Life Service Manual GREE ELECTRIC APPLIANCES,INC.OF ZHUHAI...
  • Page 13 1015 1087 Unit:mm 1015 1087 Unit:mm...
  • Page 14 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 D heat exchanger gas -liquid separator filter Note: Not available for 14K/18K model A1:A unit electronic expansion valve B1:B-unit electronic expansion valve...
  • Page 15 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...
  • Page 17 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!
  • Page 18 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! AC-L E(PE) LX2-2 LX2-1 COMP CONNECTOR...
  • Page 21 Terminal of compressor Terminal low-temperature cooling temperature sensor Overload protection terminal of compressor Temperature sensor terminal of outdoor unit High-pressure protection terminal Low-pressure protection terminal Terminal of outdoor fan Electric heating belt terminal of chassis Terminal of 4-way valve Electric heating belt terminal of compressor...
  • Page 22 Terminal of compressor Low-pressure protection terminal High-pressure protection terminal Overload protection terminal of compressor Temperature sensor terminal of outdoor unit Electric heating terminal of chassis Electric heating terminal of compressor Terminal of outdoor fan Terminal of 4-way valve Temperature sensor of liquid valve and gas valve for unit A Temperature sensor of...
  • Page 23 Terminal electronic expansion valve G-MatrikII chip Jumper cap Terminal of temperature sensor STM8S207 chip Overload protection terminal of compressor Low-pressure protection terminal High-pressure switch 1 High-pressure switch 2 Terminal of 4-way valve Communication interface for indoor unit and outdoor unit PTC resistance Piezoresistor DC fan terminal...

  • Page 24: Top View

    ● 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 valve...
  • Page 25 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; in this case, the electronic expansion valve, the outdoor fan and the compressor start operation.

  • Page 26: Protection Function

    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. 1.3.4 Defrosting function When the defrosting condition is met, the compressor stops;...

  • Page 27: Communication Malfunction

    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 29 master/slave...
  • Page 32 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 the support of outdoor unit Install wall-mounting frame, drill wall holes (select it according to the actual situation) Connect pipes of indoor Fix outdoor unit unit and drainage pipe...
  • Page 33 Front Grill Handle To unit A To unit B connecting Power cord connecting cable cable To the power supply Handle Front Grill To unit A To unit B Power cord connecting connecting cable cable To the power supply...
  • Page 34 Handle To unit A To unit B To unit C Power cord connecting connecting connecting cable cable cable To the power supply Outdoor unit Indoor unit...
  • Page 35 Handle Front side plate To unit B To unit C To unit D To unit A Power cord connecting connecting connecting connecting cable cable cable cable To the power supply Outdoor unit Indoor unit...
  • Page 36 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 37 50cm or above Space to the cover 30cm or above (Air inlet side) 50cm or above Space to the cover 24/28K 30cm or above (Air inlet side)
  • Page 38 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 Is the drainage smooth?
  • Page 39 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 40 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 41 Table 1 Recommended Cord Capacity of the Models Power Supply pieces× 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 42 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 43 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 44 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 09,12...
  • Page 45 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 46 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 47 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 49 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”; (3) Other malfunction: It will be displayed after the compressor has been stopped for 200s, please refer to “Malfunction status sheet”.
  • Page 50 Viewing malfunction code through remote controller within Compressor overload protection 200s; displayed directly on nixietube after 200s Wrong connection of communication wire or malfunction of Hardware malfunction electronic expansion valve Malfunction of complete units current detection Hardware malfunction Detection status of wrong connection of communication wire Operation status or malfunction of electronic expansion valve t c i...
  • Page 51 ● If the resistance of compressor coil is normal? If the isolation of compressor coil with copper pipe is good? ● If the unit is overloaded? If the heat radiation of the unit is good? ● If the refrigerant charge is suitable? Energize the unit Flow chart: Please check:...
  • Page 52 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? resumes normal...
  • Page 53 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...
  • Page 54 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 than 3min?
  • Page 55 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 Input voltage is normal?
  • Page 56 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 57 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 If the stop duration of the compressor...
  • Page 58 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 59 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 foreign objects?
  • Page 60 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 De-energize,check if the connection...
  • Page 61 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 Reconnect according to...
  • Page 62 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 operate the unit after the outdoor...
  • Page 63 (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 64 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 65 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 Low Voltage...
  • Page 66 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 67 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 5 Unit n indoor pipe midway temperature Flash twice Indoor Table 5 sensor error Indoor Evaporator...
  • Page 68 Once errors are displayed on the controller, please shut off the air conditioning unit and contact the professionally skilled personnel for troubleshooting. 1.4 After-Sales Service If there is any quality or other issue, place contact the GREE after-sales service center.
  • Page 69 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 credible.
  • Page 70 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 71 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 specified in the nameplate...
  • Page 72 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 73 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 indoor uint Malfunction display: F5 Failure of Exhaust Temp.
  • Page 87 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. 3. Remove Coping Coping Remove the connection screws connecting the top panel with the right side plate and the left side plate, and then remove the Coping...
  • Page 88 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 89 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 90 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. Then remove the motor.
  • Page 91 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 92 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 93 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 94 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. Remove the 3 screws connecting the top top panel panel with the front panel and the right side plate, and then remove the top panel.
  • Page 95 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 96 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 97 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 98 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 99 condenser sub-assy 11.Remove condenser sub-assy Remove the chassis sub-assy and condenser sub-assy. chassis sub-assy...
  • Page 100 Disassembly and Assembly of Outer Casing Steps Procedure 1. Disassemble the cover plate Remove the fixed screws on the cover plate by using a screwdriver. Remove the cover plate. 2. Disassemble the front panel Remove the fixed screws on the front panel by using a screwdriver.
  • Page 101 Steps Procedure 4. Dismount the grille Remove the fixed screws on the grille by using a screwdriver. Remove the grille. 5. Disassemble the outer casing Remove the fixed screws on the outer casing by using a screwdriver. Remove the outer casing. 6.
  • Page 102 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 103 Steps Procedure 3. Take down the bad compressor Remove the bolts on the compressor by using a tool. 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 Place the compressor on the bottom plate.
  • Page 104 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. Place the new 4-way valve in the right place.
  • Page 105 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 106 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 Remove the bolt fixing the liquid separator by a tool. Remove the liquid separator from the middle baffle.
  • Page 108 Pipe Pipe cutter Leaning Uneven Burr Pipe Shaper Downwards Union pipe Pipe Hard mold Expander Pipe Smooth surface Improper expanding damaged leaning crack uneven surface thickness The length is equal...

  • Page 112: Gree Electric Appliances,Inc.of Zhuhai

    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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