Service Manual
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website http://www.lgservice.com LG LG Room Air Conditioner SERVICE MANUAL MODEL: LWHD1800HR, LWHD2400HR LWHD1807HR, LWHD2400HRY7 CAUTION • BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. • ONLY FOR AUTHORIZED SERVICE PERSONNEL.
website http://www.lgservice.com LG LG Room Air Conditioner SERVICE MANUAL MODEL: LWHD1800HR, LWHD2400HR LWHD1807HR, LWHD2400HRY7 CAUTION • BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. • ONLY FOR AUTHORIZED SERVICE PERSONNEL.
Service Manual
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... kit 10 Suggested tool Requirements...10 Cabinet Installation...11 Operation ...13 Disassembly instructions...14 Mechanical parts ...14 Air Handling Parts ...15 Electrical Parts ...16 Refrigeration cycle ...19 Schematic Diagram...22 Troubleshooting guide...23 Piping System ...23 Troubleshooting guide ...24 Room Air Conditioner Voltage Limits...26 Exploded View...28 Replacement Parts List ...29 2 Room...
... kit 10 Suggested tool Requirements...10 Cabinet Installation...11 Operation ...13 Disassembly instructions...14 Mechanical parts ...14 Air Handling Parts ...15 Electrical Parts ...16 Refrigeration cycle ...19 Schematic Diagram...22 Troubleshooting guide...23 Piping System ...23 Troubleshooting guide ...24 Room Air Conditioner Voltage Limits...26 Exploded View...28 Replacement Parts List ...29 2 Room...
Service Manual
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.... Be cautious when unpacking and installing the product. Do not store or use flammable gas or combustibles near the air conditioner. • Sharp edges could fall with age. • If the base collapses, the air conditioner could cause injury. Gasolin Be sure the installation area does not deteriorate with it, causing property damage, product...
.... Be cautious when unpacking and installing the product. Do not store or use flammable gas or combustibles near the air conditioner. • Sharp edges could fall with age. • If the base collapses, the air conditioner could cause injury. Gasolin Be sure the installation area does not deteriorate with it, causing property damage, product...
Service Manual
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Dimensions Symbols Used in this Manual This symbol alerts you to hazards that could cause harm to the risk of electric shock. NOTICE This symbol indicates special notes. Outside Dimensions Dimensions D W H Dimension W H D Model mm(inch) mm(inch) mm(inch) LWHD1800HR 660 (26) 428 (16 27/32) 675 (26 9/16) LWHD2400HR 660 (26) 428 (16 27/32) 770 (30 5/16) Service Manual 5 This symbol alerts you to the air conditioner.
Dimensions Symbols Used in this Manual This symbol alerts you to hazards that could cause harm to the risk of electric shock. NOTICE This symbol indicates special notes. Outside Dimensions Dimensions D W H Dimension W H D Model mm(inch) mm(inch) mm(inch) LWHD1800HR 660 (26) 428 (16 27/32) 675 (26 9/16) LWHD2400HR 660 (26) 428 (16 27/32) 770 (30 5/16) Service Manual 5 This symbol alerts you to the air conditioner.
Service Manual
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CONTROL THERMISTOR AIR DIRECTION CONTROL VERTICAL LOUVER(RIGHT&LEFT) HORIZONTAL LOUVER(UP&DOWN) CONSTRUCTION SLIDE IN-OUT CHASSIS ELECTRIC HEATER 3.5KW, 230V COMPRESSOR INTERNAL OVERLOAD PROTECTOR PROTECTOR FAN ... Bulb ** WB:Wet Bulb NOTE: Please refer to Label Quality on the produst since this specification may be changed for improving performance. 6 Room Air Conditioner Specfications Product Specifications ITEMS MODELS LWHD1800HR LWHD2400HR POWER SUPPLY 1Ø, 208/230V, 60Hz 1Ø, 208/230V, 60Hz COOLING CAPACITY (Btu/h) 17,500/18,000 23,00/23,500...
CONTROL THERMISTOR AIR DIRECTION CONTROL VERTICAL LOUVER(RIGHT&LEFT) HORIZONTAL LOUVER(UP&DOWN) CONSTRUCTION SLIDE IN-OUT CHASSIS ELECTRIC HEATER 3.5KW, 230V COMPRESSOR INTERNAL OVERLOAD PROTECTOR PROTECTOR FAN ... Bulb ** WB:Wet Bulb NOTE: Please refer to Label Quality on the produst since this specification may be changed for improving performance. 6 Room Air Conditioner Specfications Product Specifications ITEMS MODELS LWHD1800HR LWHD2400HR POWER SUPPLY 1Ø, 208/230V, 60Hz 1Ø, 208/230V, 60Hz COOLING CAPACITY (Btu/h) 17,500/18,000 23,00/23,500...
Service Manual
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CONTROL THERMISTOR AIR DIRECTION CONTROL VERTICAL LOUVER(RIGHT&LEFT) HORIZONTAL LOUVER(UP&DOWN) CONSTRUCTION SLIDE IN-OUT CHASSIS ELECTRIC HEATER 3.5KW, 230V COMPRESSOR INTERNAL OVERLOAD PROTECTOR PROTECTOR FAN ... * DB:Dry Bulb ** WB:Wet Bulb NOTE: Please refer to Label Quality on the produst since this specification may be changed for improving performance. 7 Room Air Conditioner Specfications Product Specifications ITEMS MODELS LWHD1807HR LWHD2400HRY7 POWER SUPPLY 1Ø, 208/230V, 60Hz 1Ø, 208/230V, 60Hz COOLING CAPACITY (Btu/h) 17,500/18,000 23...
CONTROL THERMISTOR AIR DIRECTION CONTROL VERTICAL LOUVER(RIGHT&LEFT) HORIZONTAL LOUVER(UP&DOWN) CONSTRUCTION SLIDE IN-OUT CHASSIS ELECTRIC HEATER 3.5KW, 230V COMPRESSOR INTERNAL OVERLOAD PROTECTOR PROTECTOR FAN ... * DB:Dry Bulb ** WB:Wet Bulb NOTE: Please refer to Label Quality on the produst since this specification may be changed for improving performance. 7 Room Air Conditioner Specfications Product Specifications ITEMS MODELS LWHD1807HR LWHD2400HRY7 POWER SUPPLY 1Ø, 208/230V, 60Hz 1Ø, 208/230V, 60Hz COOLING CAPACITY (Btu/h) 17,500/18,000 23...
Service Manual
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...) Left frame curtain Frame guide(2) Window locking bracket Sill bracket(2) Support bracket(2) Right frame curtain Type A (14) Type B (7) Type C (5) Type D (2) Carriage Bolt (2) Lock Nut (4) 9 Room Air Conditioner The top and bottom window sashes must be secured to firm wood, masonry, or metal. • WINDOW REQUIREMENTS 1. The stool offset (height between the stool...
...) Left frame curtain Frame guide(2) Window locking bracket Sill bracket(2) Support bracket(2) Right frame curtain Type A (14) Type B (7) Type C (5) Type D (2) Carriage Bolt (2) Lock Nut (4) 9 Room Air Conditioner The top and bottom window sashes must be secured to firm wood, masonry, or metal. • WINDOW REQUIREMENTS 1. The stool offset (height between the stool...
Service Manual
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... Top retainer bar Figure 7 Window stool Front angle Window sash Top retainer bar Foam-PE Cabinet Frame curtain Foam-PE Figure 8 Sash track 11 Room Air Conditioner Figure 9 Front Angle Screw(Type B)
... Top retainer bar Figure 7 Window stool Front angle Window sash Top retainer bar Foam-PE Cabinet Frame curtain Foam-PE Figure 8 Sash track 11 Room Air Conditioner Figure 9 Front Angle Screw(Type B)
Service Manual
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... cabinet. (See Fig. 11) CAUTION: For security purpose, reinstall screws (Type A) at cabinet's sides. 8. Slide the unit into the tabs on the front of room air conditioner is now completed. Attach the front grille to the cabinet by using screws (Type C). (See Fig. 10) Figure 10 7. 5. Attach the Window locking bracket with...
... cabinet. (See Fig. 11) CAUTION: For security purpose, reinstall screws (Type A) at cabinet's sides. 8. Slide the unit into the tabs on the front of room air conditioner is now completed. Attach the front grille to the cabinet by using screws (Type C). (See Fig. 10) Figure 10 7. 5. Attach the Window locking bracket with...
Service Manual
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To turn the air conditioner ON, push the button. ROOM TEMPERATURE SETTING BUTTON This button can automatically control the air flow direction. 7. Approximately every 3 munutes the fan will turn on the heater, will toggle COOL, FAN and HEAT. 3. AUTO SWING This...Hi[ ] ➔ Low[ ] ➔ Hi[ ]....) 5. ENERGY SAVER The fan stops when the compressor stops cooling. POWER BUTTON To turn the air conditioner OFF, push the button again. The damper is opened and room air is needed. 8. FAN SPEED SELECTOR Everytime you push this button, it will disappear quickly. 13 Room...
To turn the air conditioner ON, push the button. ROOM TEMPERATURE SETTING BUTTON This button can automatically control the air flow direction. 7. Approximately every 3 munutes the fan will turn on the heater, will toggle COOL, FAN and HEAT. 3. AUTO SWING This...Hi[ ] ➔ Low[ ] ➔ Hi[ ]....) 5. ENERGY SAVER The fan stops when the compressor stops cooling. POWER BUTTON To turn the air conditioner OFF, push the button again. The damper is opened and room air is needed. 8. FAN SPEED SELECTOR Everytime you push this button, it will disappear quickly. 13 Room...
Service Manual
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... Cover. (See Fig. 20) 6. Remove the Heater Cover.(See Fig. 20) 7. Re-install the components by referring to section 1) 2. Air handling parts 4. Remove the cabinet. (Refer to the removal procedure, above . Re-install the components by referring to section 2) 3. Remove the... orifice from the air guide carefully. (See Fig. 21) 8. Remove the front grille. (Refer to the removal procedure, above . Remove the cover. (Refer to section 4) 2. Remove the blower with plier. (See Fig. 21) 9. Blower 1. Figure 20 Figure 21 Disassembly 15 Room Air Conditioner Figure 22
... Cover. (See Fig. 20) 6. Remove the Heater Cover.(See Fig. 20) 7. Re-install the components by referring to section 1) 2. Air handling parts 4. Remove the cabinet. (Refer to the removal procedure, above . Re-install the components by referring to section 2) 3. Remove the... orifice from the air guide carefully. (See Fig. 21) 8. Remove the front grille. (Refer to the removal procedure, above . Remove the cover. (Refer to section 4) 2. Remove the blower with plier. (See Fig. 21) 9. Blower 1. Figure 20 Figure 21 Disassembly 15 Room Air Conditioner Figure 22
Service Manual
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... removal procedure above . Disconnect the 2 leads from main P.W.B assembly. 4. Re-install the components by referring to the removal procedure, above . (See Figure 30) 17 Room Air Conditioner Figure 29 Disassembly Pull the power cord. (See Fig. 28) 7. Remove a screw which fasten the display panel. 3. Remove the screw and the clamp which has...
... removal procedure above . Disconnect the 2 leads from main P.W.B assembly. 4. Re-install the components by referring to the removal procedure, above . (See Figure 30) 17 Room Air Conditioner Figure 29 Disassembly Pull the power cord. (See Fig. 28) 7. Remove a screw which fasten the display panel. 3. Remove the screw and the clamp which has...
Service Manual
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... fasten the side cover.(See Fig. 31) 4. Re-install the components by referring to notes. (See Fig. 32) Figure 31 18. Figure 32 19 Room Air Conditioner Remove the evaporator. 7. After discharging the refrigerant completely, unbraze the interconnecting tube at the left side and the top side. 5. Remove the cabinet. (Refer to...
... fasten the side cover.(See Fig. 31) 4. Re-install the components by referring to notes. (See Fig. 32) Figure 31 18. Figure 32 19 Room Air Conditioner Remove the evaporator. 7. After discharging the refrigerant completely, unbraze the interconnecting tube at the left side and the top side. 5. Remove the cabinet. (Refer to...
Service Manual
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Disassembly Equipment needed: Vacuum pump, Charging cylinder, Manifold gauge, Brazing equipment. CONDENSER (HIGH PRESSURE SIDE) COMPOUND GAUGE MANIFOLD GAUGE B A CAPILLARY TUBE SEE INSETS BELOW EVAPORATOR (LOW PRESSURE SIDE) COMPRESSOR A B EXTERNAL VACUUM PUMP Figure 31A-Pulling Vacuum 21 Room Air Conditioner LOW HI B A CHARGING CYLINDER C Figure 31B-Charging Pin-off tool capable of making a leak-proof seal, Leak detector, Tubing cutter, Hand Tools to remove components, Service valve.
Disassembly Equipment needed: Vacuum pump, Charging cylinder, Manifold gauge, Brazing equipment. CONDENSER (HIGH PRESSURE SIDE) COMPOUND GAUGE MANIFOLD GAUGE B A CAPILLARY TUBE SEE INSETS BELOW EVAPORATOR (LOW PRESSURE SIDE) COMPRESSOR A B EXTERNAL VACUUM PUMP Figure 31A-Pulling Vacuum 21 Room Air Conditioner LOW HI B A CHARGING CYLINDER C Figure 31B-Charging Pin-off tool capable of making a leak-proof seal, Leak detector, Tubing cutter, Hand Tools to remove components, Service valve.
Service Manual
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... and their function in the cooling cycle. ROOM AIR CONITIONER CYCLE OF REFRIGERATION EVAPORATOR COILS COOLED AIR COMPLETE LIQUID BOIL OFF POINT SUCTION LINE COOL LOW PRESSURE VAPOR ROOM AIR HEAT LOAD CONDENSER COILS VAPOR INLET HOT DISCHARGED AIR LIQUID PRESSURE DROP 23 Room Air Conditioner MOTOR OUTSIDE COOLING AIR FOR REFRIGERANT PASS THROUGH COMPRESSOR OIL (LIQUID...
... and their function in the cooling cycle. ROOM AIR CONITIONER CYCLE OF REFRIGERATION EVAPORATOR COILS COOLED AIR COMPLETE LIQUID BOIL OFF POINT SUCTION LINE COOL LOW PRESSURE VAPOR ROOM AIR HEAT LOAD CONDENSER COILS VAPOR INLET HOT DISCHARGED AIR LIQUID PRESSURE DROP 23 Room Air Conditioner MOTOR OUTSIDE COOLING AIR FOR REFRIGERANT PASS THROUGH COMPRESSOR OIL (LIQUID...
Service Manual
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Compressor only fails to start . Defect of power voltage. Irregular motor resistance ( ) Irregular motor insulation ( ) Replacement of compressor (Motor damaged) 25 Room Air Conditioner Regular but fails to start . Drop of compressor capacitor. Gas leakage of feeler bulb of thermostat Check of rotor, metal). Improper wiring. Replacement of compressor (...
Compressor only fails to start . Defect of power voltage. Irregular motor resistance ( ) Irregular motor insulation ( ) Replacement of compressor (Motor damaged) 25 Room Air Conditioner Regular but fails to start . Drop of compressor capacitor. Gas leakage of feeler bulb of thermostat Check of rotor, metal). Improper wiring. Replacement of compressor (...
Service Manual
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...(s). Tighten it . If knocking sounds continue when running , replace motor. If not within ±10% of balance, or partially missing, replace it . Troubleshooting Guide Room Air Conditioner Voltage Limits NAME PLATE RATING 208~230±10% 115±10% MINIMUM 187V 104V MAXIMUM 253V 126V COMPLAINT Fan motor will not run , but...
...(s). Tighten it . If knocking sounds continue when running , replace motor. If not within ±10% of balance, or partially missing, replace it . Troubleshooting Guide Room Air Conditioner Voltage Limits NAME PLATE RATING 208~230±10% 115±10% MINIMUM 187V 104V MAXIMUM 253V 126V COMPLAINT Fan motor will not run , but...
Service Manual
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... tubing Remove the cabinet carefully and rearrange tubing not to HIGH COOL or LOW COOL while rocker switch is open circuit. 27 Room Air Conditioner Wiring Synchronous motor. Check continuity of replace. Check the compressor overload, if externally mounted. Replace if open . (If the compressor ...temperature is properly sized for open . Close if open circuit or ground. If loose or missing, correct. Auto air-swing fails. Check the synchronous motor for a restriction. if restricted, clean carefully with a vacuum cleaner (do not damage fins) or brush. ...
... tubing Remove the cabinet carefully and rearrange tubing not to HIGH COOL or LOW COOL while rocker switch is open circuit. 27 Room Air Conditioner Wiring Synchronous motor. Check continuity of replace. Check the compressor overload, if externally mounted. Replace if open . (If the compressor ...temperature is properly sized for open . Close if open circuit or ground. If loose or missing, correct. Auto air-swing fails. Check the synchronous motor for a restriction. if restricted, clean carefully with a vacuum cleaner (do not damage fins) or brush. ...
Service Manual
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... FAN ASSEMBLY, AXIAL 753000 HEATER, ELECTRIC 753010 HEATER ASSEMBLY, ELECTRIC W0CZZ CAPACITOR, DRAWING W48602 CLAMP, SPRING 325115-1 TUBE, EVAPORATOR 325115-2 TUBE, EVAPORATOR 29 Room Air Conditioner PART NO. LWHD1800HR LWHD2400HR 3041A30002Y 3091AR6057X 3530AR1604A 3531A20073W 3551A30015A 3720AR6163A 2H01102A 4758AR7264C 4758AR7278C 4758AR6157A 4800AR7271A 4998AR1597A 5231AR6159A 3831A10018M 4995A20186C 6411A20051G 6323A20003F 6871A20195V 6871A10188C 6711A20034D 4681AR6033K 4900AR7265A 4960AR1596A...
... FAN ASSEMBLY, AXIAL 753000 HEATER, ELECTRIC 753010 HEATER ASSEMBLY, ELECTRIC W0CZZ CAPACITOR, DRAWING W48602 CLAMP, SPRING 325115-1 TUBE, EVAPORATOR 325115-2 TUBE, EVAPORATOR 29 Room Air Conditioner PART NO. LWHD1800HR LWHD2400HR 3041A30002Y 3091AR6057X 3530AR1604A 3531A20073W 3551A30015A 3720AR6163A 2H01102A 4758AR7264C 4758AR7278C 4758AR6157A 4800AR7271A 4998AR1597A 5231AR6159A 3831A10018M 4995A20186C 6411A20051G 6323A20003F 6871A20195V 6871A10188C 6711A20034D 4681AR6033K 4900AR7265A 4960AR1596A...
Service Manual
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...,ELECTRIC CAPACITOR,DRAWING CLAMP,SPRING TUBE,EVAPORATOR TUBE,EVAPORATOR 135500 COVER 731273 INSTALL PART ASSEMBLY,SINGLE 749740 135515 GUIDE COVER ASSEMBLY,TOP(INDOOR) 30 Room Air Conditioner PART NO(2007) LWHD1807HR LWHD2400HRY7 3041A23004F 3041A23004H 3091AR6056Q 3091AR6056Q 3530AR1604A 3530AR1604A 3531A20073W 3531A20073W 3551A30015A 3551A30015A 3720AR6163A 3720AR6163A 2H01102J 2H01102J 4758AR7264C 4758AR7264C 4758AR7278C 4758AR7278C 4758AR6157A 4758AR6157B...
...,ELECTRIC CAPACITOR,DRAWING CLAMP,SPRING TUBE,EVAPORATOR TUBE,EVAPORATOR 135500 COVER 731273 INSTALL PART ASSEMBLY,SINGLE 749740 135515 GUIDE COVER ASSEMBLY,TOP(INDOOR) 30 Room Air Conditioner PART NO(2007) LWHD1807HR LWHD2400HRY7 3041A23004F 3041A23004H 3091AR6056Q 3091AR6056Q 3530AR1604A 3530AR1604A 3531A20073W 3531A20073W 3551A30015A 3551A30015A 3720AR6163A 3720AR6163A 2H01102J 2H01102J 4758AR7264C 4758AR7264C 4758AR7278C 4758AR7278C 4758AR6157A 4758AR6157B...