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Gree GWHD(18)NK3FO Service Manual

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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 4 Installing, starting up, and servicing air conditioner can be Make sure the outdoor unit is installed on a stable, level surface with no accumulation of snow, leaves, or trash hazardous due to system pressure, electrical components, and equipment location, etc. beside.
  • Page 9 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 11 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 12 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 13 Compressor terminal Temp sensor terminal of low ambient temp cooling Compressor overload protection terminal Outdoor temp sensor terminal High pressure protection terminal Low pressure protection terminal Outdoor fan terminal Terminal of chassis electric heating belt 4-way valve terminal Terminal of compressor electric heating belt Temp sensor terminal of gas valve and liquid valve...
  • Page 14 Compressor terminal High pressure protection terminal Low pressure protection terminal Compressor overload protection terminal Outdoor temp sensor terminal Terminal of chassis electric heater Terminal of compressor electric heater Outdoor fan terminal 4-way valve terminal Unit A liquid valve and gas valve temp sensor Unit B liquid valve and gas valve temp sensor...

  • Page 15: Cooling Mode

    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 16: 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 17: Overcurrent Protection

    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 18 Handle Front side plate To unit B To unit A connecting Power cord connecting cable cable To the power supply Handle To unit A To unit B connecting connecting Power cord cable cable To the power supply...
  • Page 19 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 20: Outdoor Unit

    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 21 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 22 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 23 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 32 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 33 Viewing malfunction code through remote controller within Compressor overload protection 200s; displayed directly on nixietube after 200s Indoor unit and outdoor unit do not match Hardware malfunction Malfunction of memory chip Hardware malfunction Wrong connection of communication wire or malfunction of Hardware malfunction electronic expansion valve Malfunction of complete units current detection...
  • Page 34 If the unit is overloaded? If the heat radiation of the unit is good? If the refrigerant charge is suitable? Flow chart: Energize the unit Please check: 1. if the indoor and outdoor heat exchanges are dirty, if there is obstacle to affect the radiation; 2.
  • Page 35 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 36 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 The induction is broken Replace the induction Malfunction is eliminated Replace the outdoor mainboard...
  • Page 37 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 38 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 39 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 40 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 41 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 42 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 43 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 44 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 45 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 49 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 50 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 51 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 52 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 53 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 54 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 55 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 56 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 57 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 58 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 59 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 60 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 61 condenser sub-assy 11.Remove condenser sub-assy Remove the chassis sub-assy and condenser sub-assy. chassis sub-assy...
  • Page 62 Add: West Jinji Rd, Qianshan, Zhuhai, Guangdong, China, 519070 Tel: (+86-756) 8522218 Fax: (+86-756) 8669426 E-mail: gree@gree.com.cn www.gree.com For continuous improvement in the products, Gree reserves the right to modidy the product specification and appearance in this manual without notice and without incurring any obligations.

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