LG LWC183MGAB1 Service Manual Download Page 1

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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: LWC183MGMJ1, LWC183MSMM1, LWC183MGAB1

website http://biz.lgservice.com
e-mail http://www.lgeservice.com/techsup.html

Summary of Contents for LWC183MGAB1

Page 1: ... MANUAL CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL ONLY FOR AUTHORIZED SERVICE MODELS LWC183MGMJ1 LWC183MSMM1 LWC183MGAB1 website http biz lgservice com e mail http www lgeservice com techsup html ...

Page 2: ...YNCHRONOUS MOTOR 9 2 4 REFRIGERATION CYCLE 10 2 4 1 CONDENSER 10 2 4 2 EVAPORATOR 10 2 4 3 CAPILLARY TUBE 10 3 INSTALLATION 3 1 HOW TO INSTALL THE UNIT 13 3 2 HOW TO USE THE REVERSIBLE INLET GRILLE 13 3 3 WINDOW REQUIREMENTS 14 3 4 INSTALLATION KITS CONTENTS 14 3 5 SUGGESTED TOOL REQUIREMENTS 15 3 6 CABINET INSTALLATION 16 4 TROUBLESHOOTING GUIDE 4 1 OUTSIDE DIMENSIONS 18 4 2 PIPING SYSTEM 18 4 3 ...

Page 3: ...ant is charged at the factory Be sure to read the safety precautions prior to servicing the unit 1 3 SPECIFICATIONS POWER SUPPLY COOLING CAPACITY INPUT RUNNING CURRENT REFRIGERANT R 22 OPERATING INDOOR TEMPERATURE OUTDOOR EVAPORATOR CONDENSER FAN INDOOR FAN OUTDOOR FAN SPEEDS FAN COOLING FAN MOTOR OPERATION CONTROL ROOM TEMP CONTROL AIR DIRECTION CONTROL CONSTRUCTION PROTECTOR COMPRESSOR FAN MOTOR...

Page 4: ...will automatically control the temperature of the room Select the higher number for the lower temperature of the room The temperature is selected by positioning the knob to the desired position The 5 or 6 position is a normal setting for average conditions OPERATION OFF Turns the air conditioner off MED FAN Permits the medium fan speed operation without cooling LOW FAN Permits the low fan speed op...

Page 5: ... temperature within a range of 16 C to 30 C AUTO RESTART SWITCH NOT TO ALL MODELS In failure of electric power if the switch is set to ON the unit runs as previous setting operation when power returns AUTO SWING BUTTON Control the horizontal air direcion by air swing system SIGNAL RECEIVER 6 6 7 7 8 8 Precaution The Remote Control unit will not function properly if strong light strikes the sensor ...

Page 6: ...pan forward 2 1 3 CONTROL BOX 1 Remove the front grille Refer to section 2 1 1 2 Pull the base pan forward so that you can remove the 2 screws which fasten the cover control at the right side See Fig 3 3 Remove the 3 screws which fasten the control box See Fig 3 4 Discharge the capacitor by placing a 20 000 ohm resistor across the capacitor terminals 5 Disconnect two wire housings in the control b...

Page 7: ...ard carefully 4 Remove the orifice from the air guide carefully 5 Remove the clamp spring which is clamped to the boss of blower by hand plier See Fig 5 6 Pull the blower outward without touching blades See Fig 6 7 Re install the components by referring to the removal procedure above 2 2 3 FAN 1 Remove the cabinet Refer to section 2 1 2 2 Remove the brace and shroud cover Refer to section 2 2 1 3 ...

Page 8: ...ischarge the refrigerant by using a Refrigerant Recovery System 3 Disconnect the 3 leads from the compressor 4 After purging the unit completely unbraze the suction and discharge tubes at the compressor connections 5 Remove the 3 nuts and the 3 washers which fasten the compressor See Fig 10 6 Remove the compressor 7 Re instill the components by referring to the removal procedure above 2 3 3 CAPACI...

Page 9: ...ch has the same specification marked on the supply cord fitted to the unit 2 3 5 THERMISTOR 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 thermistor terminals from main P W B assembly 4 Remove the thermistor 5 Re install the components by referring to the removal procedure above See Figure 13 2 3 6 SYNCHRONOUS MOTOR 1 Remove the co...

Page 10: ...vaporator at the left side and the top side 5 Move the evaporator sideward carefully and then unbraze the interconnecting tube at the evaporator connectors 6 Remove the evaporator 7 Re install the components by referring to notes See Fig 16 2 4 3 CAPILLARY TUBE 1 Remove the cabinet Refer to section 2 1 2 2 Remove the brace Refer to section 2 2 1 3 After discharging the refrigerant completely unbra...

Page 11: ...ifold connection 5 The system is now ready for final charging 6 Recharge as follows 1 Refrigeration cycle systems are charged from the High side If the total charge cannot be put in the High side the balance will be put in the suction line through the access valve which you installed as the system was opened 2 Connect the charging cylinder as shown in Fig 17B With valve C open discharge the hose a...

Page 12: ...or proof seal Leak detector Tubing cutter Hand Tools to remove components Service valve A COMPOUND GAUGE EVAPORATOR LOW PRESSURE SIDE COMPRESSOR CAPILLARY TUBE CONDENSER HIGH PRESSURE SIDE SEE INSETS BELOW MANIFOLD GAUGE B Figure 17A Pulling Vacuum Figure 17B Charging A B EXTERNAL VACUUM PUMP A CHARGING CYLINDER LOW HI B C ...

Page 13: ...8 to follow the refrigeration cycle and the flow of the refrigerant in the cooling cycle MOTOR COMPRESSOR OIL LIQUID REFRIGERANT CAPILLARY TUBE OUTSIDE COOLING AIR FOR REFRIGERANT PASS THROUGH SUCTION LINE COOL LOW PRESSURE VAPOR COOLED AIR COMPLETE LIQUID BOIL OFF POINT LIQUID PRESSURE DROP ROOM AIR HEAT LOAD VAPOR INLET HOT DISCHARGED AIR LIQUID OUTLET HIGH PRESSURE VAPOR LIQUID PEFRIGERANT LOW ...

Page 14: ...kage Repair gas leak Replacement of unit if the unit is beyond repair Satisfactory operation with temperature difference of inlet outlet air 44 6 50 F Check heat load increase Unexpected residue Overloaded Circuit Check of inside gas pressure Adjusting of refrigerant charge Malfunction of compressor Replacement of compressor Check of cold air circulation for smooth flow Dirty indoor coil Heat exch...

Page 15: ... fan motor Regular but fails to start Replacement of compressor locking of rotor metal Improper thermistor setting Loose terminal connection Improper wiring Irregular motor resistance Irregular motor insulation Replacement of compressor Motor damaged Drop of power voltage Check capacitor Replacement Only compressor fails to start Defect of compressor capacitor Check of power source Check of contro...

Page 16: ...between Main and Display all right Is the reset circuit all right The No 14 of Micom is 5V Check the Fuse Check the wiring diagram Check the Main P W B pattern Exchange the Trans Exchange D02D D05D Exchange IC01D Exchange IC02D Exchange IC01A Connect connector exactly Check the P W B pattern NO NO NO NO NO NO NO YES YES YES YES YES YES YES NO YES ELECTRIC PARTS TROUBLESHOOTING GUIDE MODEL LWC183MG...

Page 17: ... wiring Diagram NO NO NO NO YES YES YES YES Possible Trouble 2 The compressor does not operate Is the wire connection of RY COMP all right Check the RY COMP Connect LEAD Wire to RY COMP again NO YES Possible Trouble 3 The compressor always operate Exchange IC01M Exchange IC01M Is the voltage NO 1 or 2 or 4 of IC01M DC 5V Is the voltage NO 13 or 15 or 16 of IC01M 0V Check the RY Hi or RY Lo Check t...

Page 18: ...ttern Connect connector to CN DISP1 exactly NO NO NO YES YES YES NO NO YES YES Is the Knob of SW1 set to left position Is the voltage No 1 of CN DISP of Main PCB Ass y DC 5V Reference to OWNER S MANUAL Set the Knob of SW1 to left position Check the SW1 Check the pattern of Main Display PCB Possible Trouble 6 Romote controller does not operate Possible Trouble 5 The function of Energy Saver does no...

Page 19: ...n of CN DISP1 all right Exchange the display P W B Ass y Exchange IC01G Exchange Q01G Q02G Q03G Q04G Connect connector to CN DISP1 exactly Does the Q01G Q02G Q03G Q04G operate normally on main P W B Ass y Possible Trouble 7 It displays abnormally on Display P W B Ass y ...

Page 20: ...or Discharge Test capacitor capacitor before testing Replace if not within 10 of manufacturer s rating Replace if shorted open or damaged Will not rotate Fan blade hitting shroud or blower wheel hitting scroll Re align assembly Units using slinger ring condenser fans must have 0 22 0 25 inch clearance to the base If necessary shim up the bottom of the fan motor with mounting screw s Check fan moto...

Page 21: ...fer to the wiring diagram for terminal identification Replace the switch if the circuit is open Thermistor Check the TEMP control If not at the lowest number set TEMP control to this setting and restart the unit Check the continuity of the thermistor Replace the thermistor if the circuit is open Capacitor discharge Check the capacitor capacitor before Replace if not within 10 of manufacturer s ser...

Page 22: ...citor Test the capacitor Wiring Check the terminals If loose repair or replace Refrigeration system Check the system for a restriction Insufficient cooling Air filter If restricted clean or replace Exhaust damper door Close if open Unit undersized Determine if the unit is properly sized for the area to be cooled Excessive noise Blower or fan Check the set screw or clamp If loose or miss ing correc...

Page 23: ...L BK BR Ribbed Plain 1 7 6 8 5 9 2 3 4 1 2 3 10 4 11 WH BL POWER INPUT BK BR Ribbed Plain GN YL GN GN YL GN THERMISTOR BK BK BL RD BL RD CN TH1 YL YL OR BR OR BR OR BR SYNC MOTOR RY LO RY HI CN WORK CN SYNC CN DISP DISPLAY P W B ASM RY SYNC 250V T2A 115V T2A TRANS FORMER ZNR RY COMP MAIN P W B ASM BK BK BR BR RD BL BL OLP RD MOTOR CAPACITOR F R S COMP C C H 3854AR2330P WIRING DIAGRAM RY MID FUSE R...

Page 24: ...5 14 13 17 19 18 VSS VAref 16 Osc in Osc out Reset 22 21 20 COMP 4WAY LOW SYNC 24 25 26 23 Pipe TH Option1 Option2 Room TH 5 6 7 1 2 3 SEG c SEG a SEG b 4 MICOM TMP87CH47U SEG d 44 SEG e SEG f 43 42 41 SEG g VDD 39 38 37 KEY0 40 SLIDE SW 27 28 29 ION MED HI 31 32 33 Buzzer 30 Receiver LED out3 36 35 34 LED out0 LED out1 LED out2 KEY1 HVB R22H 1 1 12 1K 0K R03H R21H 12 1K 5V OR2H 7 10 4 5 6 13 12 1...

Page 25: ... 25 5 3 COMPONENTS LOCATION FOR MAIN P C B ASM MODEL LWC183MGMJ1 LWC183MSMM1 5 4 COMPONENTS LOCATION FOR DISPLAY P C B ASM MODEL LWC183MGMJ1 LWC183MSMM1 ...

Page 26: ...600 346811 130410 354210 147582 349001 359012 349480 W48602 W48602 559010 731273 267110 149980 550140 554160 352115 352113 35211A 352111 263230 268712 146812 264110 268714 237200 238310 W0CZZ 249950 135510 130910 W52106 2 W52106 1 W0CZZ 269310 249950 135500 266003 137215 146812 264110 266002 149410 ...

Page 27: ...ASSEMBLY DISPLAY 6871A20140C 6871A20195C R 268714 PWB PCB ASSEMBLY MAIN 6871A10031F 6871A20188A R 269310 THERMOSTAT ASSEMBLY 2H01109L R 346811 MOTOR ASSEMBLY SINGLE 4681A20081B R 349001 DAMPER VENTILATION 4900AR7265B R 349480 ORIFICE 4948A20014A R 349600 MOUNT MOTOR 4960AR1596A R 352102 TUBE CAPILLARY BEND 5211A20020P R 352113 TUBE ASSEMBLY DISCHARGE 5211A20805A R 352111 TUBE ASSEMBLY CONNECTOR 52...

Page 28: ...P No 3828A20294E February 2003 Printed in Korea ...

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