LG LWHD1200R Service Manual
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LG LWHD1200R Service Manual

Room air conditioner
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See also: Owner's Manual
LG Room
Air Conditioner

SERVICE MANUAL

MODEL: LWHD1200R
website http://www.lgservice.com
CAUTION
• BEFORE SERVICING THE UNIT, READ THE SAFETY
PRECAUTIONS IN THIS MANUAL.
• ONLY FOR AUTHORIZED SERVICE PERSONNEL.
LG

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Summary of Contents for LG LWHD1200R

  • Page 1: Service Manual

    LG Room Air Conditioner SERVICE MANUAL MODEL: LWHD1200R CAUTION • BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. • ONLY FOR AUTHORIZED SERVICE PERSONNEL.

  • Page 2: Table Of Contents

    Air Conditioner Service Manual TABLE OF CONTENTS Safety Precautions............................3 Dimensions ..............................5 Outside Dimensions ...........................5 Product Specifications ..........................6 Installation ...............................7 Select the Best Location ..........................7 Installation Check ............................7 How to Secure the Drain Pipe ........................7 How to Install..............................8 Suggested Tool Requirements ........................9 Operation ..............................12 Function of Controls ..........................12 Disassembly ..............................13...

  • 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. WARNING This symbol indicates the possibility of death or serious injury.
  • Page 4 Safety Precautions Do not modify or extend the power cord. Do not install, remove, or re-install the unit by yourself(customer). • There is risk or fire or electric shock. • There is risk of fire, electric shock, explosion, or injury. Be cautious when unpacking and installing Do not store or use flammable gas or com- the product.

  • Page 5: 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. This symbol indicates special notes. NOTICE Outside Dimensions Cool ˚C F1 LOW F2 MED...

  • Page 6: Product Specifications

    Specfications Product Specifications MODELS LWHD1200R ITEMS 1ø, 115, 60Hz POWER SUPPLY 12,000 COOLING CAPACITY (Btu/h) 1,220 INPUT 11.0 RUNNING CURRENT (BTU/W . h) E.E.R OPERATING 19.4(WB)** INDOOR (°C) CONDITION 23.9(WB)** OUTDOOR (°C) 490(17.3 oz) REFRIGERANT (R-22) CHARGE 2 ROW 12 STACKS...

  • Page 7: Installation

    Installation Installation Select the Best Location 1.To prevent vibration and noise, make sure the unit is installed securely and firmly. FENCE 2.Install the unit where the sunlight does not shine direct- AWNING ly on the unit. COOLED AIR 3.The outside of the cabinet must extend outward for at HEAT least 12"...

  • Page 8: How To Install

    Installation How to Install When Using Gasket Cool F1 LOW ˚C Cool ˚C Energy F2 MED F3 HIGH F1 LOW Saver Energy F2 MED F3 HIGH Saver TEMP Timer Timer TEMP RIGHT SIDE MODE TIMER SPEED POWER MODE TIMER POWER SPEED HORIZONTAL LINE...

  • Page 9: Suggested Tool Requirements

    Installation Suggested Tool Requirements SCREWDRIVER (+, -), RULER, KNIFE, HAMMER, PENCIL, LEVEL Preparation of Chassis Shipping 1. Remove the screws that fasten the cabinet at both Screws sides and at the back. 2. Slide the unit out from the cabinet by gripping the base pan handle and pulling forward while bracing the cabinet.
  • Page 10 Installation 3. Loosely assemble the sill support using the parts INDOOR OUTDOOR Figure Sill Support Bolt Figure 4 4. Select the position that will place the sill support near the outer most point on sill (See Figure Frame Guide Screw(Type A) Be careful when you install the cabinet NOTICE (Frame Guides...
  • Page 11 Installation 10. Slide the unit into the cabinet.(See Fig. 8) CAUTION: For security purpose, reinstall screws (Type A) at the cabinet's sides. Power cord Cool Energ Saver Time TIME Screw(Type A) Screw(Type A) Figure 8 11. Cut the Foam-Strip to the proper length and insert between the upper and lower window sash.

  • Page 12: Operation

    Operation Operation Function of Controls • Designed for COOLING ONLY. • Built-in adjustable Thermistor • Powerful and whispering cooling. • Washable one-touch filter • Slide-in and slide-out chassis for the simple instal- • Compact size lation and service. • Reliable and efficient rotary compressor •...

  • Page 13: Disassembly

    Disassembly Disassembly — Before the following disassembly, set the CONTROL BOX to OFF and disconnect the power cord. Mechanical Parts 1. Front Grille 1. Open the lnlet grille downward and remove the air filter. 2. Remove the screw that fastens the front grille.(See Figure 14) 3.

  • Page 14: Air Handling Parts

    Disassembly Air Handling Parts 4. Air Guide and Turbo Fan 1. Remove the front grille. (Refer to section 1) 2. Remove the cabinet. (Refer to section 2) 3. Remove the control box. (Refer to section 3) 4. Remove the 4 screws that fasten the brace. 5.

  • Page 15: Electrical Parts

    Disassembly 6. Shroud 1. Remove the fan. (Refer to section 2.2.2) 2. Remove the shroud. (See Figure 8) 3. Re-install the components by referring to the removal procedure, above. Figure 21 Electrical Parts 7. Overload Protector 1. Remove the cabinet. (Refer to section 2) 2.
  • Page 16 Disassembly 9. Capacitor 1. Remove the control box. (Refer to section 3) 2. Open the top cover from the control box. (See Figure 24) 3. Pull out the capacitor from the control box. 4. Disconnect all the leads of capacitor terminals. 5.

  • Page 17: Refrigerating Cycle

    Disassembly 11. Motor 1. Remove the cabinet. (Refer to section 2) 2. Remove the turbo fan. (Refer to section 4) 3. Remove the fan. (Refer to section 5) 4. Remove the 4 screws that fasten the motor from the air guide. (See Figure 26) 5.

  • Page 18: Capillary Tube

    Disassembly 14. Capillary Tube 3. Remove the capillary tube. 1. Remove the cabinet. (Refer to section s2) 4. Re-install the components by referring to notes. 2. After discharging the refrigerant completely, unbraze the interconnecting tube at the capillary tube.(See caution above) NOTICE —...
  • Page 19 Disassembly Equipment needed: Vacuum pump, Charging cylinder, Manifold gauge, Brazing equipment. Pin-off tool capable of making a vapor-proof seal, Leak detector, Tubing cutter, Hand Tools to remove components, Service valve. Figure 29B-Charging Figure 29A-Pulling Vacuum Service Manual 19...

  • Page 20: Schematic Diagram

    Schematic Diagram Schematic Diagram Electronic Control Device 20 Room Air Conditioner...

  • Page 21: Wiring Diagram

    Schematic Diagram Wiring Diagram CN-AC/DC CN-AC/DC CN-MOTOR GN/YL MOTOR DC PCB ASSEMBLY CAPACITOR CN-TH1 POWER TRANS THERMISTOR CN-PWR SWITCH DC12V CN-12V Ribbed FUSE 250V/T2A (115V/T2A) H.V. Plain CN-HVB ASSEMBLY GN/YL RY-COMP COMP. AC PCB ASSEMBLY AIR FILTER WIRING DIAGRAM 3854AR3563N ASSEMBLY S: Service Parts N: Non Service Parts...

  • Page 22: Components Location

    Schematic Diagram Components Location 1. MAIN P.C.B ASSEMBLY R01T Q01T CN-MOTOR CN-HVB CN-TELE CN-TH2 Q03T C03T Q04T CN-PWR QIC02DT CN-4WAY ZNR01J C01J R01J C02D C04D C05D E03J E02J E01J C01D E04J E05J POWER TRANS RY-COMP FUSE 250V/T2A ASSEMBLY:6871A20167 2. DISPLAY P.C.B. ASSEMBLY 22 Room Air Conditioner...

  • Page 23: Troubleshooting Guide

    Troubleshooting Guide Troubleshooting Guide Piping System CONDENSER COIL CAPILLARY TUBE MOTOR COMPRESSOR TURBO FAN EVAPORATOR COIL Figure 30 is a brief description of the important components and their function in what is called the refrigeration system. This will help you to understand the refrigeration cycle and the flow of the refrigerant in the cooling cycle. ROOM AIR CONITIONER CYCLE OF REFRIGERATION EVAPORATOR COILS...
  • Page 24 Troubleshooting Guide Troubleshooting Guide In general, possible trouble is classified in two kinds. The one is called Starting Failure which is caused from an electrical defect, and the other is ineffective Air Conditioning caused by a defect in the refrigeration circuit and improper application. Unit runs but poor cooling.
  • Page 25 Troubleshooting Guide Fails to Start Check of power source. Check circuit breaker and fuse. Check of control switch Gas leakage of feeler bulb setting. of thermostat Check of control switch. Compressor only fails to Fan only fails to start. start. Improper wiring.

  • Page 26: Electrical Parts Troubleshooting Guide

    Troubleshooting Guide Electrical Parts Troubleshooting Guide Possible Trouble 1 The unit does not operate. Is the • Check the Fuse. Trans input power AC 115V? • Check the Fuse. • Check the wiring diagram. (208/230V for LWL1230WAL) • Check the wiring diagram. •...
  • Page 27 Troubleshooting Guide Possible Trouble 2 The compressor does not operate. Is setting • Select the setting Temp. to lower Number. Temp. set lower than Room Temp.-0.5°C? Is the voltage No.10 Is the voltage N0.9 of Does the Unit delay of IC01M 0V? IC01M DC 12V? for 3 minutes? •...
  • Page 28 Troubleshooting Guide Possible Trouble 4 FAN does not operate. Is the voltage NO.1 or 2 or 4 • Replace IC01M. of IC01M DC 12V? Is the voltage NO.16 or 15 or 13 • Replace IC01M. of IC01M 0V? • Check the RY-Hi or RY-Med or RY-Lo.
  • Page 29 Troubleshooting Guide Possible Trouble 6 Remote controller does not operate. Is the voltage of Battery • Replace the battery. over 2.3V? Is the voltage No.10 • Check the PCB pattern. of CN-AC/DC on DC PCB • Check the PCB pattern. Ass'y DC 5V? •...

  • Page 30: Electrical Parts

    Troubleshooting Guide Electrical Parts Possible Trouble 1 The unit does not operate. Is the • Check the Fuse. Trans input power AC 115V? • Check the Fuse. • Check the wiring diagram. (208/230V for LWL1230WAL) • Check the wiring diagram. •...
  • Page 31 Troubleshooting Guide Possible Trouble 2 The compressor does not operate. Is desired • Select the desired Temp. to lower Number. Temp. set lower than Room Temp.-0.5°C? Is the voltage No.10 Is the voltage N0.9 of Is the Unit for 3 minutes of IC01M 0V? IC01M DC 12V? delay?
  • Page 32 Troubleshooting Guide Possible Trouble 4 FAN does not operate. Is the voltage NO.1 or 2 or 4 • Replace IC01M. of IC01M DC 5V? Is the voltage NO.16 or 15 or 13 • Replace IC01M. of IC01M 0V? • Check the RY-Hi or RY-Med or RY-Lo.
  • Page 33 Troubleshooting Guide Possible Trouble 6 It displays abnormally on DC PCB Ass’y. • Replace IC01G, Are IC01G and IC02G IC02G. • Connect connector Is the connection of to CN-AC/DC exactly. CN-AC/DC OK? Does the IC03G • Replace IC03G. operate normally on AC PCB Ass'y? •...
  • Page 34 Troubleshooting Guide COMPLAINT CAUSE REMEDY Fan motor will not run. No power Check voltage at outlet. Correct if none. Power supply cord Check voltage to Control Box. If none, check power supply cord. Replace cord if circuit is open. Wire disconnected or con- Connect wire.
  • Page 35 Troubleshooting Guide COMPLAINT CAUSE REMEDY Compressor will not run, Thermistor Check the TEMP control. If not at the lowest number, but fan motor runs. set TEMP control to this setting and restart the unit. Check the continuity of the thermistor. Replace the thermistor if the circuit is open.

  • Page 36: Exploded View

    Exploded View Exploded View 731373 149980 130910 148000 346811 W48602 559012 559010 W48602 352390-2 354212 352390-1 267110 147582 152312 147581 349001 135312 567502 554160 152302 130410 135313 550140 249950 352115 552111 268714 W0CZZ 135500 268712 237200 238310 263230 er g S av 352113 D ry...

  • Page 37: Replacement Parts List

    Replacement Parts List Replacement Parts List PART NO. LOCATION REMARK DESCRIPTION HBLG1203R / R1200E 130410 BASE PAN WELD ASS'Y 3041A20020X 130910 CABINET ASS'Y 3091A10071B 135312 FRONT GRILL ASS'Y 3531A20161D 135313 INLET GRILLE 3530A20076A 135500 COVER, CONTROL BOX 3550A30114A 147581 HORIZONTAL LOUVER 4758A20018A 147582 VERTICAL LOUVER...
  • Page 38 January, 2005 P/No.: 3828A29003B Printed in China...

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