LG BWC076GBAA0 Service Manual Download

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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 PERSONNEL.

MODEL: BWC076GBAA0

BWC096GBAA0

BWC126CBAA0

(Applied to new refrigerant R-410A)

website http://biz.LGservice.com
e-mail http://www.LGEservice.com/techsup.html

Summary of Contents for BWC076GBAA0

Page 1: ... SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL ONLY FOR AUTHORIZED SERVICE PERSONNEL MODEL BWC076GBAA0 BWC096GBAA0 BWC126CBAA0 Applied to new refrigerant R 410A website http biz LGservice com e mail http www LGEservice com techsup html ...

Page 2: ...TS LIST 22 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 When servicing the unit set the ROTARY SWIT...

Page 3: ...g 450g 2 ROW 14 STACKS 3 ROW 14 STACKS 2 ROW 13 STACKS 2 ROW 16 STACKS 2 ROW 16 STACKS 2 ROW 18 STACKS TURBO FAN PROPELLER TYPE FAN WITH SLINGER RING 2 3 4 POLES ROTARY SWITCH THERMOSTAT VERTICAL LOUVER RIGHT LEFT HORIZONTAL LOUVER UP DOWN SLIDE IN OUT CHASSIS INTERNAL OVERLOAD PROTECTOR INTERNAL THERMAL PROTECTOR 1 8m 3 WIRE WITH GROUDING ATTACHMENT PLUG CORD CONNECTED TYPE DRAIN PIPE OR SPLASHED...

Page 4: ...erature of the room Select the right side for lower room temperature The temperature is selected by turning the knob to the desired position The middle position of arc 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 operation without cooling HIGH COOL Permits cool...

Page 5: ... 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 components by...

Page 6: ...5 10 Remove the clamp with hand plier which secures the blower 11 Remove the blower 12 Remove the 4 screws which fasten the air guide from the barrier 13 Move the air guide backward and pulling out from the base pan 14 Re install the components by referring to the removal procedure above 2 2 2 FAN 1 Remove the cabinet Refer to section 2 1 2 2 Remove the brace Refer to section 2 2 1 3 Remove the 4 ...

Page 7: ...r purging the unit completely unbraze the suction and discharge tubes at the compressor connections 4 Remove the 3 nuts and the 3 washers which fasten the compressor See Figure 8 5 Remove the compressor 6 Re install the components by referring to the removal procedure above 2 3 2 CAPACITOR 1 Remove the control box Refer to section 2 1 3 2 Remove the knobs and the screw which fasten control panel f...

Page 8: ... 6 Re install the components by refereing to the above removal procedure See Figure 11 2 3 5 ROTARY SWITCH 1 Remove the control box Refer to section 2 1 3 2 Open the control box Refer to section 2 3 2 3 Remove the 2 screws which fasten the rotary switch 4 Disconnect all the leads of the rotary switch terminals 5 Remove the rotary switch 6 Re install the components by referring to the above removal...

Page 9: ...ction 2 1 2 2 Remove the 2 screws which fasten the evaporator 3 Move the evaporator sideways carefully Refer to section 2 2 1 4 After discharging the refrigerant completely unbraze the interconnecting tube at the evaporator connections 5 Remove the evaporator 6 Re install the component by referring to notes See Figure 15 2 4 3 CAPILLARY TUBE 1 Remove the cabinet Refer to section 2 1 2 2 After disc...

Page 10: ...as shown in figure 16B With valve C open discharge the hose at the manifold connection 3 Open valve A and allow the proper charge to enter the system Valve B is still closed 4 If more charge is required the high side will not take it Close valve A 5 With the unit running open valve B and add the balance of the charge a Do not add the liquid refrigerant to the Low side b Watch the Low side gauge Th...

Page 11: ... other refrigerants Always carry out the work with dedicated tools Failure to do so could lead to trouble 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 A CHARGING CYLINDER LOW HI B C A B EXTERNAL VACUUM PUMP Fitting UNF 1 2 20 Figure 16A Pulling Vacuum Figu...

Page 12: ...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 15AMP circuit 3 To avoid vibration or noise make sure the air conditioner is installed securely 4 Avoid placing furniture or draperies in front of the air inlet and outlet The air conditioner must be instal...

Page 13: ...rward while bracing the cabinet 4 Remove the white styrofoam block from the compressor Only AWC126CGAA0 5 Slide the air conditioner into the case Reinstall the 2 screws removed earlier on each side of the case CAUTION The power cord must be connected to an independent circuit The green wire must be grounded 6 Stuff the foam between the top of the unit and the wall to prevent air and insects from g...

Page 14: ... out the filter upward open the inlet grille slightly Turn inside out the front grille Disassemble the inlet grille from the front grille with separating the hinged part by inserting a type screw driver tip Rotate the inlet grille 180 degrees and insert the hooks into the lower holes of front grille Then insert the filter 2 Attach the front grille to the cabinet by inserting the tabs on the grille...

Page 15: ...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 EVAPO...

Page 16: ... 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 charge Malfunction of compressor Replacement of compressor Check of cold air circulation for smooth flow Dirty indoor co...

Page 17: ...n 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 to start Defect of compressor capacitor Check of power source...

Page 18: ...he 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 Check grommets if worn or missing replace them 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...

Page 19: ...tricted 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 cycle 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 cle...

Page 20: ...1 2 3 4 5 6 7 1 1 1 1 1 1 1 S S S S S S S LOCATION NO DESCRIPTION REMARKS Q TY PER SET 2 1 3 4 7 6 5 COMP MOTOR WH BL POWER INPUT Plain GN GN YL BK BR Ribbed WIRING DIAGRAM 3854A20966B BL L B RD BK R C S YL YL RD BK BL RD ROTARY SWITCH BK BL L 7 1 8 6 4 2 H M OR BR OR BR BL RD BK THERMOSTAT CAPACITOR P T C RD BK F C H BR YL OLP S Service Parts N Non Service Parts ...

Page 21: ...4 5 6 7 1 1 1 1 1 1 1 S S S S S S S LOCATION NO DESCRIPTION REMARKS Q TY PER SET 2 1 3 4 7 6 5 COMP MOTOR WH BL POWER INPUT Plain GN GN YL BK BR Ribbed WIRING DIAGRAM 3854AR3563A BL L B RD BK R C S YL YL RD BK BL RD ROTARY SWITCH BK BL L 7 1 8 6 4 2 H M OR BR OR BR BL RD BK THERMOSTAT CAPACITOR P T C RD BK F C H BR YL OLP S Service Parts N Non Service Parts ...

Page 22: ... 559011 149980 130910 148000 359012 349480 W48602 W48602 349600 346811 554030 130410 352390 349001 152302 147582 147581 135313 567502 554160 550140 269310 266003 W0CZZ 135500 264110 149410 135312 249950 552113 552102 35211A 352113 W52106 2 W52106 1 352115 ...

Page 23: ... DESCRIPTION BWC076GBAA0 BWC096GBAA0 BWC126CBAA0 LOCATION NO REMARK R Service Parts AEB32446201 3531A29013C R 3530A10182A 3530A10186A R 5231A20004A 5231AR1152A R 4758A30008A 4758AR7308A R 4758A20054A 4758A20051A R 3091A30017C ABJ32854602 R 4830AR4355A R AEC30854803 AEC33656803 R 4901A30001A 4900AR7024A R 4960A20014A 4960A20005A R EAU31489101 4681A20073M R 5900A10008A 5900A20030A R 5900A20015A 5900...

Page 24: ...P No 3828A20529E March 2007 Printed in Thailand ...

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