DeLonghi GWHD18A1NK3EA Service Manual
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DeLonghi GWHD18A1NK3EA Service Manual

Split type room air conditioner (applied to new refrigerant r-410a)
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Room Air Conditioner
SERVICE MANUAL
SPLIT TYPE ROOM AIR CONDITIONER
CAUTION
-BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
-ONLY FOR AUTHORIZED SERVICE PERSONNEL.
MODEL: GWHD18A1NK3EA
(Applied to new Refrigerant R-410A)
Prior to installation, this air-conditioning unit must
be submitted for approval by the utility service
which provides electricity (EN 61000-3 Norm).

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Summary of Contents for DeLonghi GWHD18A1NK3EA

  • Page 1 SPLIT TYPE ROOM AIR CONDITIONER CAUTION -BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. -ONLY FOR AUTHORIZED SERVICE PERSONNEL. MODEL: GWHD18A1NK3EA (Applied to new Refrigerant R-410A) Prior to installation, this air-conditioning unit must be submitted for approval by the utility service...

  • Page 2: Table Of Contents

    Air Conditioner Service Manual TABLE OF CONTENTS Safety Precautions ...........................1 Dimensions ............................6 Product Specifications ........................8 Installation............................9 Flaring work and connection of piping..................11 Connecting the cable between indoor unit and outdoor unit.............16 Checking the drainage and forming the pipings .................18 Air purging ............................19 Test running ............................21 Functions............................22 Operation............................24...

  • Page 3: Safety Precautions

    Safety Precautions Safety Precautions To prevent injury to the user or other people and property damage, the following instructions must be followed. Incorrect operation due to ignoring instruction will cause harm or damage. The seriousness is classified by the following indications. This symbol indicates the possibility of death or serious injury.
  • Page 4 Safety Precautions For re-installation of the installed product, Do not install, remove, or re-install the unit by always contact a dealer or an authorized ser- yourself. vice center. • There is risk of fire, electric shock, explosion, or • There is risk of fire, electric shock, explosion, or injury.
  • Page 5 Safety Precautions Operation Do not turn the air-conditioner ON or OFF by Use a dedicated outlet for this appliance. plugging or unplugging the power plug. • There is risk of fire or electrical shock. • There is risk of fire or electrical shock. Grasp the plug to remove the cord from the Do not place a heater or other appliances near outlet.
  • Page 6 Safety Precautions Unplug the unit if strange sounds, odors, or Be cautious that water could not enter the smoke comes from it. product. • There is risk of electric shock or fire. • There is risk of fire, electric shock, or product dam- age.
  • Page 7 Safety Precautions Operation Use a soft cloth to clean. Do not use harsh Do not touch the metal parts of the product detergents, solvents, etc. when removing the air filter. They are very sharp! • There is risk of fire, electric shock, or damage to the •...

  • Page 8: Dimensions

    Dimensions Dimensions Symbols Used in this Manual This symbol alerts you to the risk of electric shock. This symbol alerts you to hazards that could cause harm to the air conditioner. NOTICE This symbol indicates special notes. Indoor Unit Installation plate Model 18k Btu Series Dimension...
  • Page 9 Dimensions Outdoor Unit Liquid side (2-way valve) Gas side (3-way valve) MODEL 18k Btu Series unit 7 Room Air Conditioner...

  • Page 10: Product Specifications

    Product Specifications Product Specifications Table-1 Model Name GWHD18A1NK3EA Item Unit 1314 kcal/h.(W) 1130 Btu/h. 4483 4920 Cooling Capacity Type kcal/h.(W) 4232 Btu/h. 16787 5171 kcal/h.(W) 4447 Btu/h. 17643 1326 kcal/h.(W) 1140 Btu/h. 4526 5740 Heating Capacity Type kcal/h.(W) 4937 Btu/h.

  • Page 11: Installation

    Installation Installation Selection of the Best Location Indoor unit Rooftop Installations: • Do not have any heat or steam near the unit. • If the outdoor unit is installed on a roof structure, be sure to level the unit. Ensure the roof structure and •...

  • Page 12: Service Manual

    Installation How to Fix Installation Plate Drill a Hole in the Wall The wall you select should be strong and solid • Drill the piping hole with a ø65mm hole core drill. enough to prevent vibration Drill the piping hole at either the right or the left with the hole slightly slanted to the outdoor side.

  • Page 13: Flaring Work And Connection Of Piping

    Flaring work and connection of piping Flaring work and connection of piping Flaring work • Carry out flaring work using flaring tool as shown below. Outside diameter Flaring work inch Main cause for refrigerant leakage is due to defect in the Ø6.35 0~0.5 flaring work.

  • Page 14: Indoor Unit Installation

    Flaring work and connection of piping Connecting the pipings to the indoor unit and For right rear piping drain hose to drain pipe. Route the indoor tubing and the drain hose in the direction of • Align the center of the pipes and sufficiently tighten rear right.

  • Page 15: Room Air Conditioner

    Flaring work and connection of piping • Bundle the piping and drain hose together by wrapping Connecting the pipings to the indoor unit and them with vinyl tape for enough to cover where they fit into the drain hose to drain pipe. the rear piping housing section.
  • Page 16 Flaring work and connection of piping • Wrap the area which accommodates the rear piping hous- Indoor unit installation ing section with vinyl tape. • Remove the spacer. Indoor Connection • Ensure that the hooks are properly seated on the installa- unit piping pipe tion plate by moving it left and right.
  • Page 17 Flaring work and connection of piping Connection of the pipes-Outdoor • Bad case Align the center of the pipings and sufficiently • Following bending type from right to left could cause tighten the flare nut by hand. problem of pipe damage. Finally, tighten the flare nut with torque wrench until the wrench clicks.

  • Page 18: Connecting The Cable Between Indoor Unit And Outdoor Unit

    Connecting the cable between indoor unit and outdoor unit Connecting the cable between indoor unit and outdoor unit Connect the cable to the Indoor unit. Connect the cable to the indoor unit by connecting the wires to the terminals on the control board individually according to the outdoor unit connection.
  • Page 19 Connecting the cable between indoor unit and outdoor unit Outdoor Unit Connect the cable to the outdoor unit Remove the control cover from the unit by Terminal block loosening the screw. Connect the wires to the terminals on the con- Over 5mm trol board individually.

  • Page 20: Checking The Drainage And Forming The Pipings

    Checking the drainage and forming the pipings Checking the drainage and forming the pipings Checking the drainage Form the piping To remove the front panel from the indoor unit. Form the piping by wrapping the connecting portion of the indoor unit with insulation mate- •...

  • Page 21: Air Purging

    Air purging Air Purging Air purging • Do a leak test of all joints of the tubing(both indoor and out- door) and both gas and liquid side service valves. Air and moisture remaining in the refrigerant system have Bubbles indicate a leak. Be sure to wipe off the soap with a undesirable effects as indicated below.

  • Page 22: Finishing The Job

    Air purging Soap water method Gas side (1) Remove the caps from the 2-way and 3-way valves. (2) Remove the service-port cap from the 3-way valve. (3) To open the 2-way valve turn the valve stem counter- clockwise approximately 90°, wait for about 2~3 sec, and Liquid side close it.

  • Page 23: Test Running

    Test running Test Running 1. Check that all tubing and wiring have been properly con- NOTE: If the actual pressure is higher than shown, the system is nected. most likely over-charged, and charge should be removed. If the actual pressure are lower than shown, the system is 2.

  • Page 24: Functions

    Functions Functions Indoor Unit Cooling Mode Operation Healty dehumidification Mode Operation Heating Mode Operation Operation ON/OFF by Remote controller Sensing the Room Temperature Room temperature control • Maintain the room temperature in accordance with the Setting Temp. Time Delay Safety Control •...

  • Page 25: Outdoor Unit

    Functions Outdoor Unit Power Relay Control • If power is on, it will operate to chage capacitor on controller and power relay will operate after about 2~5sec. Active Power Filter Control(PSC) • The active power filter is designed to correct power factor(cos θ) and to regulate DC link voltage. •...

  • Page 26: Operation

    Operation Operation Function of Controls • DISPLAY 1) C/O Model Operation Indicator • ON while in appliance operation, OFF while in appliance pause. • Flashing while in disconnection or short in Thermistor. (3 sec off / 0.5 sec on) Timer Indicator •...

  • Page 27: Cooling Mode Operation

    Operation Cooling mode operation • Operating frequency of compressor depend on the difference of the temperature. (= intake air Temp.- Compressor off Temp. • Compressor off temp.= setting temp. -0.5°C on temp. = setting temp. +0.5°C • Condition of compressor turned off - When intake air temperature stay at the temperature between setting temp.
  • Page 28 Operation Heating mode operation • Operating frequency of compressor depend on the difference of the temperature (= compressor off temp. - intake air temp.) • Compressor off temp. = setting temp.+3.0°C on temp. = setting temp. • Condition of compressor turned off - When intake air temperature reaches +3°C above the setting temperature.
  • Page 29 Operation Sleep timer operation • When the sleep time is reached after [1,2,3,4,5,6,7hr] is input by the remote control during the operation, the operation of the appliance stops. • When the appliance is on pause, the sleep timer mode cannot be input. 1.
  • Page 30 Operation Auto restarting operation • When the power is restarted after a sudden power failure while in appliance operation, the mode before the power failure is kept on the memory and the appliance automatically operates in the mode on the memory. •...
  • Page 31 Operation Portection from overheating of power module • If the temperature of the heat sink TH. reaches over Toff, the Compressor stop instantly. • It will be limited the compressor operating frequency according to the heat sink TH.(refer to below FIG.) •...

  • Page 32: Remote Control Operations

    Operation Remote Control Operations The remote control sends signals to the appliance. Liquid crystal display Displays all the operating modes. Signal transmitter MODE button Used to select the operating mode. FAN button Used to set the fan speed, in sequence, to automatic, low, medium, high.

  • Page 33: Disassembly

    Disassembly Disassembly Indoor Unit Disconnect the unit from power supply before mak- ing any checks. Be sure the power switch is set to “OFF”. 1.Disassemble the front panel • Open the front panel, loosen the clasp which fix on the front panel, then lift it up can disassemble the front panel.
  • Page 34 Disassembly Disassemble the guide louver and body case • To bend the guide louver, to make the rotating shaft slide from the groove, then can take down the guide louver. • Open 3pcs screw cover, and screw off 6pcs screw which fix the body case, then lift it up loosen the clasp, then can take down the body case.
  • Page 35 Disassembly Disassemble the evaporator • Screw off the fixing screws of evaporator left side and right side (2 pcs for each side), then lift the evaporator left side up, and remove it backward, can take down the evaporator. • When repair, do not damage the Caution label. Screws Disassemble the motor and cross flow fan •...
  • Page 36 Disassembly outdoor Unit Top cover Take down the top cover • Screw off the 6pcs screw around the top cover, Screws lift the unit up can take down the top cover. Disassemble the rear grill • Screw off 4pcs tapping screw of rear grill, then take down the rear grill.
  • Page 37 Disassembly Disassemble the front panel • Screw off the tapping screws of front panel, motor supporter, chassis condenser side plate, then can take down the front panel. Screws Earth screw Disassemble the right side plate • Screw off 9pcs screw of the right side plate, then Right side plate take down the right side plate.
  • Page 38 Disassembly Disassemble the axial flow fan • Srew off the nut which fixing the axial flow fan by the spanner, then take out the nut, spring washer, flat washer in turn. Axial flow fan Disassemble the motor and motor supporter •...
  • Page 39 Disassembly Four-way valve Soldered point Disassemble the capillaries and valves • Unsolder each soldered point of main capillary and auxiliary, then take down the capillary. • To screw off the screws which fixing the gas valve and liquid valve (2pcs for each), unsolder the connection pipe and take down the valves.

  • Page 40: Schematic Diagram

    Schematic Diagram Schematic Diagram Wiring Diagram Indoor Unit Models: FAN MOTOR TUBE ROOM DISPLAY TEM.SENSOR TEM.SENSOR POWER:220/230/240V~50/60HZ YEGN 牟 牟 ROOM TUBE N(1) X111 AC-L YEGN TR-IN SWING TR-OUT X100 YEGN PTC(FUT) evaporator ｊ X303 ｉ ｋ MICRO SWITCH TRANSFORMER SWING MOTOR Room Air Conditioner 38...
  • Page 41 Schematic Diagram Outdoor Unit Models: FAN MOTOR YEGN OUTTUBE OUTROOM EXHAUST TEM.SENSOR TEM.SENSOR TEM.SENSOR COMPRESSOR TEM.SENSOR YEGN BN BN BL YE COMPRESSOR YEGN X108 X204 X203 AC-L YEGN OUTTUBE OUTROOM EXHAUST FILTERE N(1) CN10 X106 X107 COM-A RLY1 (4-V) NO COM X110 X202 X114...
  • Page 42 Schematic Diagram Models: • TOP VIEW • TOP VIEW Service Manual 40...
  • Page 43 Schematic Diagram Outdoor Unit Models: • TOP VIEW • BOTTOM VIEW 41 Room Air Conditioner...

  • Page 44: Troubleshooting Guide

    Troubleshooting Guide Troubleshooting Guide Refrigeration Cycle Diagram Cooling & Heating Models INDOOR UNIT OUTDOOR UNIT LIQUID SIDE 3-WAY VALVE HEAT HEAT EXCHANGE EXCHANGE (EVAPORATOR) (CONDENSER) GAS SIDE REVERSING 3-WAY VALVE ACCUMU VALVE LATOR COOLING COMPRESSOR HEATING Room Air Conditioner 42...
  • Page 45 Troubleshooting Guide 2-way, 3-way Valve 2-way Valve (Liquid Side) 3-way Valve (Gas Side) Valve cap Hexagonal wrench (4mm) Open position Flare nut Flare nut Closed position Open position Closed position piping piping Service Service connection connection port cap port To outdoor unit To outdoor unit Works Shaft position...
  • Page 46 Troubleshooting Guide Air purging Required tools : hexagonal wrench, adjustable wrench, The air in the indoor unit and in the piping must be torque wrenches, wrench to hold the purged. If air remains in the refrigeration pipes, it will joints, and gas leak detector. affect the compressor, reduce to cooling capacity, and could lead to a malfunction.

  • Page 47: Pumping Down

    Troubleshooting Guide Pumping Down Liquid side Indoor unit Open Outdoor unit 2-Way valve Gas side Closed 3-Way valve CLOSE CLOSE Purge the air • Procedure (6) Operate the air conditioner at the cooling (1) Confirm that both the 2-way and 3-way valves cycle and stop it when the gauge indicates are set to the open position.

  • Page 48: Re-Air Purging

    Troubleshooting Guide Re-air Purging (Re-installation) Liquid side Indoor unit Closed Outdoor unit 3-Way valve Gas side Closed 3-Way valve Gas cylinder R410A OPEN CLOSE • Procedure (6) Disconnect the charge set and the gas cylin- (1) Confirm that both the liquid side valve and the der, and set the Liquid side and Gas side gas side valve are set to the closed position.
  • Page 49 Troubleshooting Guide Balance Refrigerant of the 3-way Valve (Gas leakage) Liquid side Indoor unit Outdoor unit 3-Way valve Open Gas side 3-Way valve Open OPEN CLOSE • Procedure (1) Confirm that both the 2-way and 3-way valves (3) Open the valve (Lo side) on the charge set and are set to the back seat.
  • Page 50 Troubleshooting Guide Evacuation (All amount of refrigerant leaked) Liquid side Indoor unit Outdoor unit 3-Way valve Open Gas side 3-Way valve Open Vacuum pump OPEN CLOSE • Procedure (1) Connect the vacuum pump to the center hose (3) Close the valve (Lo side) on the charge set, of charge set center hose turn off the vacuum pump, and confirm that the gauge needle does not move (approxima-...

  • Page 51: Gas Charging

    Troubleshooting Guide Gas Charging (After Evacuation) Liquid side Indoor unit Outdoor unit Open 3-Way valve Gas side Open 3-Way valve Check valve Charging cylinder OPEN CLOSE • Procedure This is different from previous procedures. (1) Connect the charge hose to the charging Because you are charging with liquid refrigerant cylinder.

  • Page 52: Refrigerant Flow

    Troubleshooting Guide Cycle Parts Test the insulative resistance for Trouble analysis When set the breaker to ON, it will earthing, to confirm whether unit trip off at once. is current leakage or not Breaker tripped or fuse When turn on the unit, the breaker burnt out Check the breaker and test the resistance.

  • Page 53: Air Circulation

    Troubleshooting Guide Air filters are blocked Clean the filter Air circulation is insufficient Set the fan speed to high or Fan speed was set too slow medium speed Clean the filters regularly Filters of indoor unit are blocked Clean the dust accumulated on the Heat exchanger of outdoor unit is blocked surface of the heat exchanger Leakage occurs between high and low pressure...
  • Page 54 Troubleshooting Guide Compressor temperature is too high Cool the compressor for 30 min before running When cooling or heating, outdoor fan runs, but Wrong wiring Wire according to the circuit diagram compressor doesn't run. Damage of main control board Replace the main control board Replace the drainage hose Blockage or breakage of drainage hose...
  • Page 55 Troubleshooting Guide Malfunction display Compressor is running Blink 1 time Blink 2 times High-pressure protection stop of compressor Exhaust protection stop Blink 3 times Communication malfunction stoop (including indoor Blink 4 times unit and SIPM) SIPM module protection stop Blink 5 times Blink 6 times Overcurrent protection stop Cooling overload stop...
  • Page 56 Troubleshooting Guide Communication malfunction of unit B (not Blink 1 time receiving correct data for 3 minutes) Indoor middle sensor malfunction of unit B Blink 2 times Indoor outlet sensor malfunction of unit B Blink 3 times Blink 4 times Indoor inlet sensor malfunction of unit B Blink 5 times Indoor environmental sensor malfunction of unit B...
  • Page 57 Troubleshooting Guide Heating anti-high-temperature frequency limitation of unit B Blink 5 times Oil return Blink 6 times Keep 8A-current frequency for 3 minutes Blink 7 times Keep 9A-current frequency for 3 minutes Blink 8 times Outdoor environmental sensor malfunction Blink 1 time Outdoor tube sensor malfunction Blink 2 times Outdoor discharge sensor malfunction...
  • Page 58 Troubleshooting Guide Blink 10 times Volts D.C. too low Blink 11 times FIN temperature too high Blink 12 times Abnormal high speed Blink 13 times EEPROM data exception Blink 14 times Volts D.C. too high Receiving indoor data Indoor data received Service Manual 56...
  • Page 59 Troubleshooting Guide Voltage table of 15K sensor resistance value Voltage Value of Voltage Voltage Value of Voltage Voltage Voltage Temp. Temp. （V） （V） Temp. （V） （V） （V） （V） resistance Value of resistance resistance （℃） （KΩ） *15K *8.1K （℃） （KΩ） *15K *8.1K （℃）...
  • Page 60 Troubleshooting Guide Voltage table of 20K sensor resistance value Value of Value of Value of Temp. Temp. Temp. Voltage （V） （V） Voltage （V） Voltage resistance resistance resistance （℃） *15K （℃） （KΩ） *8.1K （℃） （KΩ） *8.1K （KΩ） 0.47 14.79 2.87 2.194 4.51 181.4 14.18...
  • Page 61 Troubleshooting Guide Voltage table of 50K sensor resistance value Voltage Voltage Voltage Value of Value of Value of Temp. （V） Temp. （V） Temp. （V） resistance resistance resistance （℃） *15K （℃） （KΩ） *8.1K （℃） （KΩ） *8.1K （KΩ） 484.5536 0.04 36.9866 0.52 5.4621 457.3636 0.05...
  • Page 62 UFFICI COMMERCIALE E TECNICO - VIA SEITZ, 47 - 31100 TREVISO -ITALIA, TELEFONO 0422 4131 - TELEFAX 0422 413659 GRUPPO P/No.: 3828A20833B...

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