LG LWM1836TAS Service Manual
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LG LWM1836TAS Service Manual

LG LWM1836TAS 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
MODELS: LWM1836TAS, LWM1836QCG, LWN2131QAG, Y5USC24-6R, WG2400R,
LWN2432QAS, LWN2433TCS, WG1800R, M1804R, Y5USC18-6R, LWM1836QAS,
HBLG1800R, HBLG2400R, M2403R, LWC243NSMM0, LWC243NSMM2, HBLG2350E
website http://biz.lgservice.com
e-mail http://www.lgeservice.com/techsup.html

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Summary of Contents for LG LWM1836TAS

  • Page 1: Room Air Conditioner

    ROOM AIR CONDITIONER SERVICE MANUAL CAUTION - BEFORE SERVICING THE UNIT, READ THE "SAFETY PRECAUTIONS" IN THIS MANUAL. - ONLY FOR AUTHORIZED SERVICE MODELS: LWM1836TAS, LWM1836QCG, LWN2131QAG, Y5USC24-6R, WG2400R, LWN2432QAS, LWN2433TCS, WG1800R, M1804R, Y5USC18-6R, LWM1836QAS, HBLG1800R, HBLG2400R, M2403R, LWC243NSMM0, LWC243NSMM2, HBLG2350E...

  • Page 2: Table Of Contents

    CONTENTS 1. PREFACE 1.1 SAFETY PRECAUTIONS..........................3 1.2 INSULATION RESISTANCE TEST.........................3 1.3 SPECIFICATIONS............................3 1.4 FEATURES ..............................4 1.5 CONTROL LOCATIONS ..........................4 2. DISASSEMBLY INSTRUCTIONS 2.1 MECHANICAL PARTS ............................5 2.1.1 FRONT GRILLE .............................5 2.1.2 CABINET..............................5 2.1.3 CONTROL BOX .............................5 2.2 AIR HANDLING PARTS ..........................6 2.2.1 COVER (AT THE TOP) ..........................6 2.2.2 BLOWER..............................6 2.2.3 FAN ................................6...

  • Page 3: Preface

    1. PREFACE This service manual provides various service information, including the mechanical and electrical parts, etc. This room air conditioner was manufactured and assembled under a strict quality control system. The refrigerant is charged at the factory. Be sure to read the safety precautions prior to servicing the unit. 1.1 SAFETY PRECAUTIONS 1.2 INSULATION RESISTANCE TEST 1.

  • Page 4: Features

    1.4 FEATURES • Side air-intake, side cooled-air discharge. • Designed for cooling only. • Built in adjustable THERMISTOR. • Powerful and quiet cooling. • Washable one-touch filter. • Slide-in and slide-out chassis for the simple installation and service. • Compact size. •...

  • Page 5: Disassembly Instructions

    2. DISASSEMBLY INSTRUCTIONS — Before the following disassembly, POWER SWITCH is set to OFF and disconnected the power cord. 2.1 MECHANICAL PARTS 2.1.1 FRONT GRILLE 1. Open the inlet grille upward or downward. 2. Remove the screw which fastens the front grille. 3.

  • Page 6: Air Handling Parts

    2.2 AIR HANDLING PARTS 2.2.1 COVER (AT THE TOP) 1. Remove the front grille. (Refer to section 2.1.1) 2. Remove the cabinet. (Refer to section 2.1.2) 3. Remove 11 screws which fasten the brace and covers. 4. Remove the covers and the brace. (See Fig. 4) 5.

  • Page 7: Shroud

    2.2.4 SHROUD 1. Remove the fan. (Refer to section 2.2.3) 2. Remove the 2 screws which fasten the shroud. 3. Remove the shroud. (See Fig. 8) 4. Re-install the component by referring to the removal procedure, above. 2.3 ELECTRICAL PARTS 2.3.1 MOTOR Figure 8 (a) Figure 8 (b)

  • Page 8: Power Cord

    2.3.4 POWER CORD 1. Remove the control box. (Refer to section 2.1.3) 2. Unfold the control box. (Refer to section 2.3.3) 3. Disconnect the grounding screw from the control box. 4. Disconnect 2 receptacles. 5. Remove a screw which fastens the clip cord. 6.

  • Page 9: Refrigeration Cycle

    2.4 REFRIGERATION CYCLE CAUTION Discharge the refrigerant system using Freon Recovery System. If there is no valve to attach the recovery system, install one (such as a WATCO A-1) before venting the Freon . Leave the valve in place after servicing the system. 2.4.1 CONDENSER 1.
  • Page 10 NOTES — Replacement of the refrigeration cycle. 1. When replacing the refrigeration cycle, be sure to 6. Recharge as follows : discharge the refrigerant system using a Freon 1) Refrigeration cycle systems are charged from the recovery System. High-side. If the total charge cannot be put If there is no valve to attach the recovery system, in the High-side, the balance will be put in the install one (such as a WATCO A-1) before venting...
  • Page 11 Equipment needed: Vacuum pump, Charging cylinder, Manifold gauge, Brazing equipment. Pinch-off tool capable of making a vapor-proof seal, Leak detector, Tubing cutter, Hand Tools to remove components, Service valve. Figure 17A-Pulling Vacuum Figure 17B-Charging —11—...

  • Page 12: Installation

    3. INSTALLATION 1/4 Bubble 3.1 HOW TO INSTALL THE UNIT 1. To avoid vibration and noise, make sure the unit is installed securely and firmly. 2. Install the unit where the sunlight does not shine directly on the unit. Level If the unit receives direct sunlight, build an awning to shade the cabinet.

  • Page 13: Window Requirements

    3.3 WINDOW REQUIREMENTS NOTE: All supporting parts should be secured to firm wood, masonry, or metal. 29" to 41" The models of the specific area don't contain installation feit. 18" min Stool Offset 3.3.1 WINDOW REQUIREMENTS Less 1. This unit is designed for installation in standard than 1 "...

  • Page 14: Suggested Tool Requirements

    3.5 SUGGESTED TOOL REQUIREMENTS SCREWDRIVER(+, -), RULER, KNIFE, HAMMER, PENCIL, LEVEL 3.5.1 PREPARATION OF CHASSIS 1. Remove the screws which fasten the cabinet at both sides and at the back. Keep these two screws which fasten the Shipping screws cabinet at both sides for later use. 2.

  • Page 15: Cabinet Installation

    3.6 CABINET INSTALLATION Sill 1. Open the window. Mark a line on the center of the window Bracket Support Bracket stool between the side window stop moldings. Carriage Lock nut Loosely attach the sill bracket to the support bracket using Bolt (M-Screw) the carriage bolt and the lock nut.
  • Page 16 5. Pull each Frame curtain fully to each window sash track, and pull the bottom window sash down behind the Top retainer bar until it meets. 6. Attach each Frame curtain the window sash by using screws (Type C). (See Fig. 27) Figure 27 7.

  • Page 17: Outside Dimensions

    4. TROUBLESHOOTING GUIDE 4.1 OUTSIDE DIMENSIONS 675(770) 4.2 PIPING SYSTEM CONDENSER COIL CAPILLARY TUBE MOTOR COMPRESSOR BLOWER EVAPORATOR COIL Following is a brief description of the important components and their functions in the refrigeration system. Refer to Fig. 33 to follow the refrigeration cycle and the flow of the refrigerant in the cooling cycle. ROOM AIR CONDITIONER CYCLE OF REFRIGERATION EVAPORATOR COILS...

  • Page 18: Troubleshooting Guide

    4.3 TROUBLESHOOTING GUIDE In general, possible trouble is classified in two causes. 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 Ineffective Cooling Check of cold air circulation...
  • Page 19 Fails to Start Check of power source. Check of circuit breaker and fuse. Check of control switch Check of control panel. setting. Only compressor fails to Only fan fails to start. start. Improper wiring. Drop of power voltage. Improper thermistor setting Defect of fan motor capacitor.
  • Page 20 ELECTRIC PARTS TROUBLESHOOTING GUIDE: Possible Trouble 1 • The unit does not operate. • Check the Fuse. Is the Trans output power the • Check the wiring diagram. same as specified? • Check the Main Is the Trans output power Is shorted the Trans.
  • Page 21 Possible Trouble 2 • The compressor does not operate. Is Temp. setting set lower than Room • Set the Temp. setting to higher Temp. Temp.-0.5 C? Is the voltage No.10 Is the voltage N0.7 of Is the Unit for 3 minutes of IC01M 0V? IC01M DC 5V? delay?
  • Page 22 • The function of Energy Saver does not operate. Possible Trouble 5 • Set the Knob of SW1 Is the Knob of SW1 to left position. set to left position? • Check the SW1. Is the voltage No.1 of • Check the pattern of CN-DISP1 of Main PCB Main &...
  • Page 23 Possible Trouble 7 • It displays abnormally on Display P.W.B Ass'y. • Exchange IC01G. Is the IC01G all right? • Connect connector Is the connection of to CN-DISP1 exactly. CN-DISP1 all right? Does the Q01G, Q02G, Q03G Q04G operate normally •...
  • Page 24 ROOM AIR CONDITIONER VOLTAGE LIMITS NAME PLATE RATING MINIMUM MAXIMUM 208~230 ± 10% 187V 253V 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.
  • Page 25 COMPLAINT CAUSE REMEDY Fan motor noise. If cracked, out of balance, or partially missing, replace it. Blower If cracked, out of balance, or partially missing, replace it. Loose set screw Tighten it. Worn bearings If knocking sounds continue when running or loose, replace the motor.
  • Page 26 COMPLAINT CAUSE REMEDY Compressor cycles on Fan motor If not running, determine the cause. Replace if overload. required. Condenser air flow Remove the cabinet, inspect the interior surface restriction of the condenser. If restricted, clean carefully with a vacuum cleaner (do not damage fins) or brush.

  • Page 27: Schematic Diagram

    5. SCHEMATIC DIAGRAM 5.1 CIRCUIT DIAGRAM POWER INPUT POWER INPUT WH(BL) BK(BR) WH(BL) BK(BR) (Ribbed) (Plain) (Ribbed) (Plain) GN/YL(GN) GN/YL(GN) THERMISTOR THERMISTOR CN-TH1 CN-TH MOTOR MOTOR OR(BR) OR(BR) OR(BR) OR(BR) GN/YL GN/YL (GN) (GN) CAPACITOR CAPACITOR OR(BR) SYNC OR(BR) SYNC MOTOR MOTOR RY-SYNC...

  • Page 28: Electronic Control Device

    5.2. ELECTOINC CONTROL DEVICE SEG-d TEST SEG-e /Reset SEG-f SEG-g SLIDE VAref KEY0 Room KEY1 out0 Pipe Option1 out1 Option2 out2 —28—...

  • Page 29: Components Location(For Main P.c.b Asm)

    5.3. COMPONENTS LOCATION (FOR MAIN P.C.B ASM) 5.4. COMPONENTS LOCATION (FOR DISPLAY P.C.B ASM) —29—...

  • Page 30: Exploded View

    6. EXPLODED VIEW 554031 130910 148000 W48602 559010 149980 352390 346811 731273 349600 130410 359012 349480 354210 147582 W48602 267110 359012 349001 554160 249950 135312 263230 550140 W0CZZ 152302 135313 135303 268712 W52106-1 W52106-2 237200 552101 238310 352115-2 552102 135510 352115-1 352113 146812...

  • Page 31: Replacement Parts List

    7. REPLACEMENT PARTS LIST R: Service Parts PART NO. LOCATION REMARK DESCRIPTION LWN2131QAG Y5USC24-6R WG2400R LWN2432QAS HBLG2400R LWN2433TCS 130410 BASE ASSEMBLY, SINGLE 3041A30001H 3041A30001R 3041A30001R 3041A30001R 3041A30001R 3041A30001R 130910 CABINET ASSEMBLY, SINGLE 3091AR6056B 3091AR6056B 3091AR6056A 3091AR6056B 3091AR6056A 3091AR6056B 135303 GRILLE, INLET 3530AR1604A 3530A10005A 3530AR1604A...
  • Page 32 R: Service Parts PART NO. LOCATION DESCRIPTION REMARK WG1800R / M1804R Y5USC18-6R WM1836QAS HBLG1800R LWM1836QCG LWM1836TAS 130410 BASE ASSEMBLY, SINGLE 3041A30002B 3041A30002B 3041A30002B 3041A30002B 3041A30002B 3041A30002B 130910 CABINET ASSEMBLY, SINGLE 3091AR6057A 3091AR6057B 3091AR6057B 3091AR6057A 3091AR6057B 3091AR6057B 135303 GRILLE, INLET 3530AR1604A 3530A10005A 3530A10070A 3530AR1604A 3530AR1604A 3530A10070A...
  • Page 33 R: Service Parts PART NO. LOCATION DESCRIPTION REMARK M2403R LWC243NSMM0 LWC243NSMM2 HBLG2350E 130410 BASE ASSEMBLY,SINGLE 3041A30001R 3041A30001R 3041A10010F 3041A10010F 130910 CABINET ASSEMBLY,SINGLE 3091AR6056A 3091AR6056B 3091AR6056B 3091AR6056A 135313 GRILLE,INLET 3530AR1604A 3530A10070A 3530A10070A 3530AR1604A 135312 GRILLE ASSEMBLY,FRONT(SINGLE) 3531A20005C 3531A20073E 3531A20073E 3531A20073J 135510 COVER ASSEMBLY,CONTROL(SINGLE) 3551A30015A 3551A30015A...
  • Page 34 MEMO —34—...
  • Page 35 September, 2006 P/No.: 3828A20095H Printed in Korea...

This manual is also suitable for:

Lwm1836qcgLwn2131qagLwn2432qasY5usc24-6rLwn2433tcsWg1800r ... Show all

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