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LG LW1200PR Service Manual

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Room Air Conditioner
SERVICE MANUAL
CAUTION
- BEFORE SERVICING THE UNIT, READ THE SAFETY
PRECAUTIONS IN THIS MANUAL.
- ONLY FOR AUTHORIZED SERVICE.
MODEL: LW1200PR
LW1200ER
LW1000PR
LW1000ER/LW1000ERY3
LWL1210WAL
LWL1230WAL
WM-1231
WEBSITE http://biz.LGservice.com
E-MAIL
http://www.LGEservice.com/techsup.html
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  • Page 1 WEBSITE http://biz.LGservice.com E-MAIL http://www.LGEservice.com/techsup.html Room Air Conditioner SERVICE MANUAL CAUTION - BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. - ONLY FOR AUTHORIZED SERVICE. MODEL: LW1200PR LW1200ER LW1000PR LW1000ER/LW1000ERY3 LWL1210WAL LWL1230WAL WM-1231...

  • Page 2: Table Of Contents

    CONTENTS 1. PREFACE 3. INSTALLATION 1.1 SAFETY PRECAUTIONS........2 3.1 SELECT THE BEST LOCATION....14 1.2 INSULATION RESISTANCE TEST ....2 3.2 CHECK OF INSTALLATION......14 1.3 SPECIFICATIONS...........3 3.3 HOW TO DRAIN..........14 1.4 FEATURES............4 3.4 HOW TO INSTALL ........15 1.5 CONTROL LOCATIONS .........4 3.4.1 WHEN USING GASKET.......15 3.4.2 WHEN USING INSTALLATION KITS...15 2.

  • Page 3: Specifications

    550g (19.4 oz) 480(17.0 oz) 470(16.6 oz) REFRIGERANT (R-22) CHARGE 3 ROW 12 STACKS, SLIT-FIN TYPE 2 ROW 10 STACKS, LG-LOUVER TYPE 2 ROW 12 STACKS EVAPORATOR 2 ROW 17 STACKS, L-BENDED TYPE 2 ROW 17 STACKS, LG-LOUVER TYPE 2 ROW17 STACKS...

  • Page 4: Features

    • Slide-in and slide-out chassis for the simple • Reliable and efficient rotary compressor is equipped. installation and service. • Low air-intake, top cooled-air discharge. 1.5 CONTROL LOCATIONS LW1200PR / LW1000PR / LWL1210WAL / LWL1230WAL DISPLAY REMOTE CONTROL PURIFIER Power...
  • Page 5 FAN SPEED SELECTOR Every time you push this button, it is set as follows..) COOL DRY HEAT DEFROST COOL DRY HEAT DEFROST COOL DRY HEAT DEFROST ENERGY ENERGY ENERGY SAVER SAVER SAVER INDOOR DESIRED INDOOR DESIRED INDOOR DESIRED PURYFIER PURYFIER PURYFIER AUTO...
  • Page 6 LW1200ER / LW1000ER / WM-1231 / LW1000ERY3 DISPLAY REMOTE CONTROL ˚C Cool F1 LOW F2 MED Energy F3 HIGH Saver Power TEMP Timer Temp MODE TIMER POWER SPEED Fan Speed Timer Mode °F F1 LOW F2 MED F3 HIGH COOL TIMER ENERGY SAVER...

  • Page 7: Disassembly Instructions

    2. DISASSEMBLY INSTRUCTIONS — Before the following disassembly, POWER SWITCH set to OFF and disconnect the power cord. 2.1 MECHANICAL PARTS 2.1.1 FRONT GRILLE 1. Open the lnlet grille downward and remove the air filter. 2. Remove the screw which fastens the front W ER grille.(See Figure 1) TI ME...

  • Page 8: Air Handling Parts

    2.2 AIR HANDLING PARTS 2.2.1 AIR GUIDE AND TURBO FAN 1. Remove the front grille. (Refer to section 2.1.1) 2. Remove the cabinet. (Refer to section 2.1.2) 3. Remove the control box. (Refer to section 2.1.3) 4. Remove the 4 screws which fasten the brace. 5.

  • Page 9: Shroud

    2.2.3 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 8 2.3 ELECTRICAL PARTS 2.3.1 OVERLOAD PROTECTOR 1. Remove the cabinet. (Refer to section 2.1.2) 2.

  • Page 10: Capacitor

    2.3.3 CAPACITOR 1. Remove the control box. (Refer to section 2.1.3) 2. Open the top cover from the control box. (See Figure 11) 3. Pull out the capacitor from the control box. 4. Disconnect all the leads of capacitor terminals. 5.

  • Page 11: Motor

    2.3.5 MOTOR 1. Remove the cabinet. (Refer to section 2.1.2) 2. Remove the turbo fan. (Refer to section 2.2.1) 3. Remove the fan. (Refer to section 2.2.2) 4. Remove the 4 screws which fasten the motor from the air guide. (See Figure 13) 5.

  • Page 12: Capillary Tube

    2.4.3 CAPILLARY TUBE 3. Remove the capillary tube. 1. Remove the cabinet. (Refer to section 2.1.2) 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) NOTES —...
  • Page 13 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 16B-Charging Figure 16A-Pulling Vacuum —13—...

  • Page 14: Installation

    3. INSTALLATION 3.1 SELECT THE BEST LOCATION 1.To prevent vibration and noise, make sure the unit is installed securely and firmly. 2.Install the unit where the sunlight does not shine FENCE directly on the unit. AWNING 3.The outside of the cabinet must extend outward for COOLED AIR at least 12"...

  • Page 15: How To Install

    3.4 HOW TO INSTALL 3.4.1 WHEN USING GASKET COOL HEAT DEFROST COOL HEAT DEFROST ENERGY SAVER ENERGY INDOOR DESIRED SAVER PURYFIER INDOOR DESIRED PURYFIER RESTART AUTO AUTO RESTART RIGHT SIDE HORIZONTAL LINE 1. WINDOW (WIDTH-A, HEIGHT-B) 4. DETAILS 5.1 x 30 ROUND HEAD WOOD SCREWS 2.
  • Page 16 SUGGESTED TOOL REQUIREMENTS SCREWDRIVER(+, -), RULER, KNIFE, HAMMER, PENCIL, LEVEL PREPARATION OF CHASSIS 1. Remove the screws which fasten the cabinet at Shipping Screws both 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 17 3. Loosely assemble the sill support using the parts INDOOR OUTDOOR Figure Sill Support Bolt Figure 22 4. Select the position that will place the sill support near the outer most point on sill (See Figure Frame Guide Screw(Type A) NOTE: Be careful when you install the cabinet (Frame Guides are broken easily).

  • Page 18: Outside Dimensions

    10. Slide the unit into the cabinet.(See Fig. 26) CAUTION: For security purpose, reinstall screws (Type A) at the cabinet's sides. Power cord Screw(Type A) Screw(Type A) Figure 26 11. Cut the Foam-Strip to the proper length and insert between the upper and lower window sash. Foam-Strip (See Fig.

  • Page 19: Piping System

    4.2 PIPING SYSTEM CONDENSER COIL CAPILLARY TUBE MOTOR COMPRESSOR TURBO FAN EVAPORATOR COIL Figure 32 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 20: Troubleshooting Guide

    4.3 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 21 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. Drop of power voltage.
  • Page 22 ELECTRICAL PARTS TROUBLESHOOTING GUIDE: LW1200PR 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 23 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 Is the Unit for 3 minutes of IC01M 0V? IC01M DC 12V? delay? •...
  • Page 24 Possible Trouble 4 FAN does not operate. Is the voltage NO.1 or 2 or 4 • Exchange IC01M. of IC01M DC 12V? Is the voltage NO.16 or 15 or 13 • Exchange IC01M. of IC01M 0V? • Check the RY-Hi or RY-Med or RY-Lo.
  • Page 25 Possible Trouble 6 Remote controller does not operate. Is the voltage of Battery • Exchange the battery. about 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 26 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 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 28 Possible Trouble 4 FAN does not operate. Is the voltage NO.1 or 2 or 4 • Exchange IC01M. of IC01M DC 5V? Is the voltage NO.16 or 15 or 13 • Exchange IC01M. of IC01M 0V? • Check the RY-Hi or RY-Med or RY-Lo.
  • Page 29 Possible Trouble 6 It displays abnormally on DC PCB Ass’y. • Exchange IC01G, Are the IC01G and IC02G IC02G. all right? • Connect connector Is the connection of to CN-AC/DC exactly. CN-AC/DC all right? Does the IC03G • Exchange IC03G. operate normally on AC PCB Ass'y? •...
  • Page 30 COMPLAINT CAUSE REMEDY Fan motor will not run. No power Check voltage at outlet. Correct if none. Power supply cord Check voltage to rotary switch. If none, check power supply cord. Replace cord if circuit is open. Rotary switch Check switch continuity. Refer to wiring diagram for terminal identification.
  • Page 31 COMPLAINT CAUSE REMEDY Compressor will not run, Thermostat Check the position of knob If not at the coldest but fan motor runs. setting, advance the knob to this setting and restart unit. Check continuity of the thermostat. Replace thermostat if circuit is open. Capacitor (Discharge Check the capacitor.

  • Page 32: Schematic Diagram

    5. SCHEMATIC DIAGRAM 5.1 CIRCUIT 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 FUSE CN-12V Ribbed 250V/T2A (115V/T2A) H.V. Plain CN-HVB ASSEMBLY GN/YL RY-COMP COMP. AC PCB ASSEMBLY AIR FILTER WIRING DIAGRAM ASSEMBLY S: Service Parts N: Non Service Parts...

  • Page 33: Electronic Control Device

    5.2 ELECTRONIC CONTROL DEVICE MODEL: LW1200PR / LW1000PR / LWL1210WAL / LWL1230WAL —33—...
  • Page 34 MODEL: LW1200ER / LW1000ER / WM-1231 / LW1000ERY3 —34—...

  • Page 35: Components Location(For Main P.c.b Asm)

    5.3 COMPONENTS LOCATION(FOR AC P.C.B ASM) MODEL: LW1200PR / LW1200ER / LW1000PR / LW1000ER / LWL1210WAL / LWL1230WAL / WM-1231 / LW1000ERY3 R01T Q01T CN-MOTOR CN-HVB CN-TELE CN-TH2 Q03T C03T CN-PWR Q04T QIC02DT CN-4WAY ZNR01J C01J R01J C02D C04D C05D...
  • Page 36 MODEL: LW1200ER / LW1000ER / WM-1231 PCB:6870A90067A ASSEMBLY:6871A20186 MODEL: LW1000ERY3 —36—...

  • Page 37: Exploded View

    6. EXPLODED VIEW 130910 554030 149980 148000 W48602 346811 359012 352390 559011 W48602 354210 267110 152312 147582 147581 349001 135312 567502 349480 554160 152302 130410 550140 135313 249950 352115 352111 268714 W0CZZ 135500 268712 S IR S AV 238310 A IR FI E S TA 263230...

  • Page 38: Replacement Parts List

    7. REPLACEMENT PARTS LIST R: Service Parts • MODEL: LW1200PR / LW1200ER N: Non Service Parts PART NO. LOCATION REMARK DESCRIPTION LW1200PR LW1200ER 130410 BASE PAN WELD ASS'Y 3041A20020J 130910 CABINET ASS'Y 3091A10032C 135312 FRONT GRILL ASS'Y 3531A20098A 135313 INLET GRILLE...
  • Page 39 R: Service Parts • MODEL: LW1000PR / LW1000ER N: Non Service Parts PART NO. LOCATION REMARK DESCRIPTION LW1000PR LW1000ER LW1000ERY3 130410 BASE ASSEMBLY,SINGLE 3041A20020L 130910 CABINET ASSEMBLY,SINGLE 3091A10032C 135312 GRILLE ASSEMBLY,FRONT(SINGLE) 3531A20098A 135313 GRILLE,INLET 3530A20037A 135500 COVER 3550A30114A 147581 LOUVER,HORIZONTAL 4758A20018A 147582 VERTICAL LOUVER...
  • Page 40 R: Service Parts • MODEL: LWL1210WAL / LWL1230WAL / WM-1231 N: Non Service Parts PART NO. LOCATION REMARK DESCRIPTION LWL1210WAL LWL1230WAL WM-1231 130910 CABINET ASSEMBLY,SINGLE 3091A10032K 3091A10032M 135303 GRILLE,INLET 3530A20037A 135312 GRILLE ASSEMBLY,FRONT(SINGLE) 3531A20098B 3531A20098A 147581 LOUVER,HORIZONTAL 4758A20018A 4758A20018A 147582 LOUVER,VERTICAL 4758A20017A/B 4758A20041A/B...
  • Page 41 MEMO —41—...
  • Page 42 MEMO —42—...
  • Page 43 July, 2003 Printed in Korea P/No : 3828A20140B...

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