LG WM-1211 Svc Manual Download Page 21 | Manualshive

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Copyright ©2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes

LGE Internal Use Only

4.2 PIPING SYSTEM

Figure 34 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.

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 REFRIGERANT

LOW PRESSURE VAPOR

ROOM AIR CONITIONER

EVAPORATOR COILS

CONDENSER COILS

CYCLE OF REFRIGERATION

CAPILLARY TUBE

COMPRESSOR

BLOWER

EVAPORATOR COIL

CONDENSER COIL

FAN

MOTOR

Figure 34

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Summary of Contents for WM-1211

Page 1: ...iew CAUTION Before Servicing the unit read the safety precautions in General SVC manual Only for authorized service personnel Internal Use Only http biz lgservice com MODEL R1203 M1203R R1203H R1403 M1003L M1203L LWC1213AAG ACG WR 1210 WM 1211 ...

Page 2: ...34 5 2 ELECTRONIC CONTROL DEVICE 38 5 3 COMPONENTS LOCATION FOR MAIN P C B ASM 40 5 4 COMPONENTS LOCATION FOR DISPLAY P C B ASM 41 6 EXPLODED VIEW 42 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 fact...

Page 3: ...9 WB 530g 18 7 oz 550g 19 4 oz 2 ROW 16 STACKS SLIT FIN TYPE 2ROW 13STACKS LOUVERED FINTYPE 2 ROW 17 STACKS LOUVERED FIN TYPE 2 ROW 17 STACKS L BENDED TYPE TURBO FAN PROPELLER TYPE FAN WITH SLINGER RING 2 3 3 3 2 3 6 POLES ROTARY SWITCH REMOTE CONTROLLER ROTARY SWITCH THERMOSTAT THERMISTOR THERMOSTAT VERTICAL LOUVER RIGHT LEFT HORIZONTAL LOUVER UP DOWN SLIDE IN OUT CHASSIS OVERLOAD PROTECTOR INTER...

Page 4: ... WEIGHT lbs kg OUTSIDE DIMENSION inch W x H x D mm 11 500 12 000 1 250 1 220 6 2 5 5 9 8 9 200 11 200 2 900 3 500 14 15 3 26 7 DB 19 4 WB 35 DB 23 9 WB 555g 19 5 oz 2 ROW 17 STACKS LOUVERED FIN TYPE BLOWER PROPELLER TYPE FAN WITH SLINGER RING 1 2 2 6 POLES ROTARY SWITCH OR ROCKER SWITCH THERMOSTAT VERTICAL LOUVER RIGHT LEFT HORIZONTAL LOUVER UP DOWN SLIDE IN OUT CHASSIS 3 5KW 230V OVERLOAD PROTECT...

Page 5: ... 2 11 0 11 0 10 8 9 8 26 7 DB 19 4 WB 35 DB 23 9 WB 470g 16 6 oz 525g 18 5 oz 530g 18 7 oz 2 ROW 13 STACKS LOUVERED FIN TYPE 2ROW 16STACKS SLIT FINTYPE 2 ROW 17 STACKS LOUVERED FIN TYPE 2ROW17STACKS LOUVERED FINTYPE TURBO FAN PROPELLER TYPE FAN WITH SLINGER RING 3 3 3 3 2 3 6 POLES REMOTE CONTROLLER ROTARY SWITCH THERMISTOR THERMOSTAT VERTICAL LOUVER RIGHT LEFT HORIZONTAL LOUVER UP DOWN SLIDE IN O...

Page 6: ...Low speed fan operation without cooling High Cool Cooling with high speed fan operation Med Cool Cooling with med speed fan operation Low Cool Cooling with low speed fan operation Built in adjustable THERMOSTAT Washable one touch filter Compact size Reliable and efficient rotary compressor is equipped CLOSE VENT OPEN Thermostat Warmer Cooler BEFORE RESTARTING WAIT THREE MINUTES Operation 1 Thermos...

Page 7: ...n stops when the compressor stops cooling Approximately every 3 minutes the fan will tern on and check the room air to determine if cooling is needed AUTO SWING This button can automatically control the air flow direction SLEEP MODE BUTTON Press the sleep mode button to set the time you want the unit to turn off automatically The timer is programmed in one hour increment by pressing the button Eve...

Page 8: ...6Hours 7Hours 8Hours 9Hours 10Hours 11Hours 12Hours 0Hour 1Hour 2Hours Starting operation 1Hour 2Hours 3Hours 4Hours 5Hours 6Hours 7Hours 8Hours 9Hours 10Hours 11Hours 12Hours off 1Hour 2Hours AUTO SWING This button can automatically control the air flow direction SLEEP MODE BUTTON Press the sleep mode button to set the time you want the unit to turn off automatically The timer is programmed in on...

Page 9: ...2 1 1 2 Remove the cabinet Refer to section 2 1 2 3 Remove the 2 screws which fasten the control box cover 4 Remove two housings which connect compressor wire and motor wire in the control box 5 Discharge the capacitor by placing a 20 000 ohmresistor across the capacitor terminals 6 Remove the 2 screws which fasten the control box 7 Pull the control box forward completely 8 Re install the componen...

Page 10: ...lectric Heater Model 11 Remove the Heater cover See Figure 5 at Electric Heater Model 12 Pull out the hook of orifice by pushing the tabs and remove it See Figure 6 13 Remove the clamp with a hand plier which secures the blower 14 Remove the blower 15 Remove the 4 screws which fasten the air guide from the barrier 16 Move the air guide backward pulling out from the base pan 17 Re install the compo...

Page 11: ...Remove the overload protector 6 Re install the component by referring to the removal procedure above 2 3 2 COMPRESSOR 1 Remove the cabinet Refer to section 2 1 2 2 Discharge the refrigerant system using a FreonTM Recovery System If there is no valve to attach the recovery system install one such as a WATCO A 1 before venting the FreonTM Leave the valve in place after servicing the system 3 Remove ...

Page 12: ...e install the component by referring to the above removal procedure above Use only one ground marked hole for ground connection 8 If the supply cord of this appliance is damaged it must be replaced by the special cord The special cord means the cord which has the same specification marked on the supply cord attached at the unit 2 3 5 THERMOSTAT 1 Remove the control box Refer to section 2 1 3 2 Ope...

Page 13: ...ews which fasten the brace Refer to section 2 2 1 3 Remove the 5 screws which fasten the condenser and shroud 4 After discharging the refrigerant completely unbraze the interconnecting tube at the condenser connections 5 Remove the condenser 6 Re install the component by referring to notes See Figure 16 2 4 2 EVAPORATOR 1 Remove the cabinet Refer to section 2 1 2 2 Remove the 2 screws which fasten...

Page 14: ...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 figure 18B With valve C open discharge the hose at the manifold connection 3 Open valve A and allow the proper charge t...

Page 15: ...e Brazing equipment Pin off tool capable of making a vapor 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 18A Pulling Vacuum Figure 18B Charging A B EXTERNAL VACUUM PUMP A CHARGING CYLINDER LOW HI B C ...

Page 16: ...ust be checked prior to initial starting The undermentioned items are especially important checking points when the installation is finished 1 Grounding wire Green or Green and Yellow is provided in the power cord The green wire must be grounded 2 Connect to a single outlet 15A circuit or 20A circuit for Electric Heater Model 3 To avoid vibration or noise make sure the air conditioner is installed...

Page 17: ...Off Med Fan Low Fan High Cool Med Cool Low Cool 1 Thermostat Operation 2 3 4 9 8 7 6 5 Off Med Fan Low Fan High Cool Med Cool Low Cool Auto Swing Off On Auto Swing Off On 1 WINDOW WIDTH A HEIGHT B 2 GASKET 3 WALL 4 DETAILS 5 1 x 30 ROUND HEAD WOOD SCREWS A B C D E F H I 625mm 392mm 280mm 30mm 0 25mm OVER 420mm 5 10mm 5 5mm 245 8 157 16 111 32 11 16 0 1 OVER 1617 32 3 16 3 8 3 16 3 16 1 2 3 4 8 9 1...

Page 18: ...he Frame Curtain into the upper guide and frame guides 9 Fasten the curtains to the unit with 4 Type A screws at the both sides CABINET INSTALLATION 1 Open the window Mark a line on center of the window stool or desired air conditioner location Carefully place the cabinet on the window stool and align the center mark on the bottom front with the center line marked in the window stool 2 Pull the bo...

Page 19: ...you install the cabinet frame guides are broken easily 5 Attach the sill support to the cabinet track hole in relation to the selected position using 2 Type A screws in each support See Figure 25 6 The cabinet should be installed with a very slight tilt about 1 2 downward toward the outside See Figure 26 Adjust the bolt and the nut of sill support for balancing the cabinet 7 Attach the cabinet to ...

Page 20: ...4 TROUBLESHOOTING GUIDE 4 1 OUTSIDE DIMENSIONS unit mm inch 10 Slide the unit into the cabinet See Fig 28 CAUTION For security purpose reinstall screws Type A at the cabinet s sides 11 Cut the foam strip to the proper length and insert between the upper and lower window sash See Fig 29 12 Attach the window locking bracket with a type C screw See Fig 30 13 Attach the front grille to the cabinet by ...

Page 21: ...ow 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 REFRIGERANT LOW PRESSURE VAPOR ROOM AIR CONITIONER EVAPORATOR ...

Page 22: ...Check outdoor coil heat exchanger the fan operation Check gas leakage Repair gas leak Replacement of unit if the unit is beyond repair Satisfactory operation with temperature difference of inlet outlet air 44 50 F 7 10 C Check heat load increase Clean condenser Not on separate circuit Check inside gas pressure Adjusting of refrigerant charged Malfunction of compressor Replacement of compressor Che...

Page 23: ...pacitor Irregular motor resistance Irregular motor insulation Replacement of fan motor Regular but fails to start Replacement of compressor locking of rotor metal Improper thermostat setting Loose terminal connection Improper wiring Irregular motor resistance Irregular motor insulation Replacement of compressor Motor damaged Drop of power voltage Capacitor check Replacement Compressor only fails t...

Page 24: ...Is the voltage No 20 of Micom DC 5V Exchange Main PCB Ass y Is the connection between Main and Display all right Is the reset circuit all right The No 16 of Micom is 5V Check the Fuse Check the wiring diagram Check the Main PCB pattern Exchange the Trans Exchange D02D D05D Exchange IC01D Exchange IC02D Exchange IC01A C02A Connect connector exactly Check the PCB pattern NO NO NO NO NO NO NO YES YES...

Page 25: ...e Is setting Temp set lower than Room Temp 0 5 C Is the voltage No 11 of IC01M 0V Exchange IC01M Select the setting Temp to lower Number Wait 3 Minutes Is the Unit for 3 minutes delay Exchange MAIN PCB Ass y Is the voltage N0 6 of IC01M DC 5V Check the RY COMP Check the wiring Diagram NO NO NO YES YES YES YES Is the wire connection of RY COMP all right Check the RY COMP Connect LEAD Wire to RY COM...

Page 26: ...e Exchange IC01M Exchange IC01M Is the voltage NO 2 or 3 or 4 of IC01M DC 5V Is the voltage NO 13 or 14 or 15 of IC01M 0V Check the RY Hi or RY Med or RY Lo Check the wiring diagram NO NO YES YES NO NO YES YES Is the Knob of SW1 set to left position Is the voltage No 1 of CN DISP1 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 patte...

Page 27: ...e connection of CN DISP2 all right Exchange the display PCB Ass y Exchange IC01G Exchange Q12G Q13G Q14G Connect connector to CN DISP2 exactly Does the Q12G Q13G Q14G operate normally on main PCB Ass y Check the PCB pattern Is the voltage of Battery about over 2 3V Exchange Receiver Ass y Is the connection of CN DISP2 all right Is the voltage No 10 of CN DISP2 on Main PCB Ass y DC 5V Exchange the ...

Page 28: ... Is the voltage No 24 of Micom DC 5V Exchange Main PCB Ass y Is the connection between Main and Display all right Is the reset circuit all right The No 36 of Micom is 5V Check the Fuse Check the wiring diagram Check the Main PCB pattern Exchange the Trans Exchange D02D D05D Exchange IC01D Exchange IC02D Exchange IC01A C01A Connect connector exactly Check the PCB pattern NO NO NO NO NO NO NO YES YE...

Page 29: ...e Is setting Temp set lower than Room Temp 0 5 C Is the voltage No 16 of IC01M 0V Exchange IC01M Select the setting Temp to lower Number Wait 3 Minutes Is the Unit for 3 minutes delay Exchange MAIN PCB Ass y Is the voltage N0 1 of IC01M DC 5V Check the RY COMP Check the wiring Diagram NO NO NO YES YES YES YES Is the wire connection of RY COMP all right Check the RY COMP Connect LEAD Wire to RY COM...

Page 30: ...the voltage NO 4 or 5 or 6 of IC01M DC 5V Is the voltage NO 11 or 12 or 13 of IC01M 0V Check the RY Hi or RY Med or RY Lo Check the wiring diagram NO NO YES YES Check the PCB pattern Is the voltage of Battery about over 2 3V Exchange Receiver Ass y Is the connection of CN DISP2 all right Is the voltage No 3 of CN DISP2 on Main PCB Ass y DC 5V Exchange the battery Check the PCB pattern Connect conn...

Page 31: ...y Possible Trouble 6 It displays abnormally on display PCB Ass y NO NO NO NO YES YES YES Are the IC01G and IC02G all right Is the connection of CN DISP2 all right Exchange the display PCB Ass y Exchange IC01G IC02G Exchange IC03G Connect connector to CN DISP2 exactly Does the IC03G operate normally on main PCB Ass y ...

Page 32: ...capacitor Check bearings Does the fan blade rotate freely If not replace fan motor Pay attention to any change from high speed to low speed If the speed does not change replace the motor If cracked out of balance or partially missing replace it If cracked out of balance or partially missing replace it Tighten it If knocking sounds continue when running or loose replace the motor If the motor hums ...

Page 33: ...ed clean carefully with a vacuum cleaner do not damage fins or brush Clean the interior base before reassembling If condenser fins are closed over a large area on the coil surface head pressures will increase causing the compressor to overload Straighten the fins or replace the coil Test capacitor Check the terminals If loose repair or replace Check the system for a restriction If restricted clean...

Page 34: ...erved Only for training and service purposes LGE Internal Use Only 1 3 6 4 2 7 5 MOTOR COMP BR YL P T C 4 3 6 5 7 2 1 BR YL S Service Parts N Non Service Parts POWER CORD ROTARY SWITCH FAN MOTOR CAPACITOR THERMOSTAT OVERLOAD PROTECTOR COMPRESSOR 1 2 3 4 5 6 7 1 1 1 1 1 1 1 S S S S S S S LOCATION NO DESCRIPTION RE MARKS Q TY PER SET ...

Page 35: ...ternal Use Only MODEL R1403 POWER CORD ROTARY SWITCH FAN MOTOR CAPACITOR THERMOSTAT COMPRESSOR 1 2 3 4 5 6 1 1 1 1 1 1 S S S S S S LOCATION NO DESCRIPTION RE MARKS Q TY PER SET 1 3 4 2 6 5 WIRING DIACRAM ROCKER SWITCH WH WH SYNC M POWER INPUT WH BL BK BR Ribbed Plain S Service Parts N Non Service Parts ...

Page 36: ... SYNC MOTOR S RD THERMISTOR BK OR BR BK BR POWER INPUT Plain CN TH1 RY LO RY MED RY SYNC CN SYNC CN DISP1 CN DISP2 DISPLAY P W B ASSY RY COMP ZNR01J MAIN P W B ASSY FUSE 250V 2A 4 3 RY HI GN GN YL WH BL Ribbed YL OLP 1 POWER CORD ASSY 1 S 2 MOTOR ASSY 1 S 3 COMPRESSOR 1 S 4 MAIN P W B ASSY 1 S 5 DISPLAY P W B ASSY 1 S 6 THERMISTOR 1 S 7 CAPACITOR 1 S 8 CONNECTOR ASSY 1 N 9 OVERLOAD PROTECTOR 1 S L...

Page 37: ...ly MODEL R1203H MOTOR COMP BR YL FUSE LING BI METAL THERMOSTAT HEATER 1 3 6 8 4 2 7 5 1 POWER CORD 1 S 2 ROTARY SWITCH 1 S 3 FAN MOTOR 1 S 4 CAPACITOR 1 S 5 THERMOSTAT 1 S 6 OVERLOAD PROTECTOR 1 S 7 COMPRESSOR 1 S 8 ELECTRIC HEATER 1 S LOCATION NO DESCRIPTION RE MARKS Q TY PER SET S Service Parts N Non Service Parts ...

Page 38: ... 38 Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only 5 2 ELECTRONIC CONTROL DEVICE MODEL M1203R WM 1211 A Heat Pump Only ...

Page 39: ...QQQQQQ QQQQQQQQQQQQQ QQQQQQQQQQQQQQQQQQQ QQQQQQQQQQQ QQQQQQQQQQQQQQQQQQQ QQQQQQQQQ QQQQQQQQQQQQQQQQQQQ QQQQQQQ QQQQQQQQQQQQQQQQQQQ QQQQQ QQQQQQQQQQQQQQQQQQQ QQQ QQQQQQQQQQQQQQQQQQQ Q QQQQQQQQQQQQQQQQQQ QQQQQQQQQQQQQQQQ QQQQQQQQQQQQQQ QQQQQQQQQQQQ QQQQQQQQQQ QQQQQQQQ QQQQQQ QQQQ QQ QQQQQQQQ QQQQQQQQQQ QQQQQQQQQQQQ QQQQQQQQQQQQQQ QQQQQQQQQQQQQQQQ QQQQQQQQQQQQQQQQQQ QQQQQQQQQQQQQQQQQQQ Q QQQQQQQQQQQQ...

Page 40: ...AIN P C B ASM MODEL M1203R WM 1211 MODEL M1003L M1203L CN TH1 IC01A 6 CN DISP1 11 CN DISP2 1 IC02D C05D RY COMP PWB ASS Y 6871A10013 PWB P NO 6870A90041A 125V 2A 250V T2A FUSE C01D D05D D04D D03D D02D C03D IC01D 1 J01 OSC01B Q01E CN BK CN BL CN RD ZNR CO1J BUZZER R01J CN SYNC CN WORK POWER TRANS F M RY HI RY MID RY LO RY SYNC 1 4 J02 J03 J04 G F M ...

Page 41: ... LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only 5 4 COMPONENTS LOCATION FOR DISPLAY P C B ASM MODEL M1203R WM 1211 MODEL M1003L M1203L PWB P NO 6870A90004D 3 6871A2011B ...

Page 42: ...es LGE Internal Use Only 147582 753010 735501 753011 269310 266003 W0CZZ 135500 264110 137215 266002 249950 149410 146812 130910 148000 149980 559011 554030 352390 W48602 346811 349600 359012 W48602 354210 349480 135313 152302 147582 147581 135312 130410 349001 567502 554160 550140 552111 352111 352113 35211A 352115 W0CZZ 135500 264110 268714 137215 249950 263230 268712 238310 ...

Page 43: ...GE Internal Use Only MODEL M1003L M1203L 147582 148000 559011 554030 W48602 567502 554160 130410 550140 35211A 552111 352111 352115 352113 135000 264110 W0CZZ 268714 137215 238310 268712 263230 249950 135312 147581 152302 135313 349480 354210 W48602 359012 352390 349001 149980 346811 349600 130910 ...

Page 44: ...ing and service purposes LGE Internal Use Only MODEL LWX123CNAA0 CGAA0 753010 266003 W0CZZ 264110 249950 269300 149410 130910 559011 554030 352390 346811 349600 359012 354210 135313 152302 753000 147582 147581 135312 130410 349001 567502 554160 550140 352113 35211A 352111 ...

Page 45: ...and service purposes LGE Internal Use Only MODEL LWC1213ACG ACE AAG 266003 W0CZZ 264110 249950 269300 149410 130910 559011 554030 352390 346811 349600 359012 349480 354210 135313 152302 147582 147581 135312 130410 349001 567502 554160 550140 352113 552111 352111 35211A 352115 ...

Page 46: ...and service purposes LGE Internal Use Only MODEL LWC1213PCW 130910 559011 554030 352390 346811 349600 359012 354210 349480 135313 152302 147582 147581 135312 130410 349001 567502 554160 550140 552111 352111 352113 35211A 352115 W0CZZ 264110 268711A 249950 263230 268711B 267110 ...

Page 47: ... training and service purposes LGE Internal Use Only MODEL LWC1213QCG 130910 559011 554030 352390 346811 349600 359012 354210 349480 135312 130410 349001 147582 567502 554160 550140 552111 352111 352113 35211A 352115 W0CZZ 264110 268711A 249950 263230 268711B 267110 ...

Page 48: ...y for training and service purposes LGE Internal Use Only MODEL LWC1213BCG 147582 269300 266003 W0CZZ 264110 249950 149410 130910 559011 554030 352390 346811 349600 359012 354210 349480 135312 130410 349001 567502 554160 550140 552111 352111 352113 35211A 352115 ...

Page 49: ...P NO 3828A30032E FEBRUARY 2008 ...

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