LG BWC186MBAB0 Service Manual Download

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Room Air Conditioner

SERVICE MANUAL

MODEL: BWC186MBAB0 / BWC226NBAB0

(Applied to new Refrigerant R-410A)

CAUTION

- BEFORE SERVICING THE UNIT, READ THE "SAFETY

PRECAUTIONS" IN THIS MANUAL.

- ONLY FOR AUTHORIZED SERVICE.

Summary of Contents for BWC186MBAB0

Page 1: ...oom Air Conditioner SERVICE MANUAL MODEL BWC186MBAB0 BWC226NBAB0 Applied to new Refrigerant R 410A CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL ONLY FOR AUTHORIZED SERVICE ...

Page 2: ...mation 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 SWITCH or POWER SWITCH to OFF and unplug the power cord 2 Observe the origi...

Page 3: ...NG 2 3 FAN MOTOR 6 POLES OPERATION CONTROL ROTARY SWITCH ROOM TEMP CONTROL THERMOSTAT VERTICAL LOUVER RIGHT LEFT HORIZONTAL LOUVER UP DOWN CONSTRUCTION SLIDE IN OUT CHASSIS COMPRESSOR INTERNAL OVERLOAD PROTECTOR FAN MOTOR INTERNAL THERMAL PROTECTOR 1 5m 3 WIRE WITH GROUNDING ATTACHMENT PLUG CORD CONNECTED TYPE DRAIN SYSTEM DRAIN PIPE OR SPLASHED BY FAN SLINGER NET WEIGHT lbs kg 130 59 152 69 OUTSI...

Page 4: ...emperature is selected by positioning the knob to the desired position The 5 or 6 position middle 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 operation without cooling HIGH COOL Permits cooling with the high fan speed operation MED COOL Permits coolin...

Page 5: ...ont 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 figure 3 3 Remove the 3 screws which fasten the control box See figure 3 4 Discharge the capacitor by placing a 20 000 ohm resistor across the capacitor terminals 5 Disconnect two wire housings in the control box 6 Pull the control box forward compl...

Page 6: ...or sideward carefully 4 Remove the orifice from the air guide carefully 5 Remove the clamp which secures the blower with plier See figure 5 6 Remove the blower with plier or your hand without touching blades See figure 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 ...

Page 7: ...ve the motor 7 Re install the components 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 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 Disconnect the 3 leads fr...

Page 8: ... the control box 4 Disconnect 2 receptacles 5 Remove a screw which fastens the clip cord 6 Pull the power cord See figure 12 7 Re install the component by referring to the 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 specifica...

Page 9: ...See figure 14 6 Re install the components by referring to the above removal procedure above 2 3 7 SYNCHRONOUS MOTOR 1 Remove the control box Refer to section 2 1 3 2 Unfold the control box Refer to section 2 3 3 3 Remove the crankshaft 4 Disconnect all the leads of the synchronous motor 5 Remove the 2 screws which fasten the synchronous motor See figure 15 6 Re install the components by referring ...

Page 10: ...2 2 1 3 Discharge the refrigerant completely 4 Remove the 3 screws which fasten the evaporator 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 figure 17 2 4 3 CAPILLARY TUBE 1 Remove the cabinet Refer to section 2 1 2 2 Remo...

Page 11: ...shown in figure 18B 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 The p...

Page 12: ... or vacuum pump with other refrigerants Always carry out the work with dedicated tools 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 18A Pulling Vacuum Figure 18B Charging CAU...

Page 13: ... figure 19 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 LIME 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 PEFRIGE...

Page 14: ...eakage Repair gas leak Replacement of unit if the unit is beyond repair Satisfactory operation with temperature difference of inlet outlet air 7 10 C 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 excha...

Page 15: ...lation 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 Check capacitor Replacement Only compressor fails to start Defect of compressor capacitor Check of power s...

Page 16: ... bearings if motor shaft will not rotate replace the motor Check voltage See limits on this page If not within limits call an electrician Test 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 Check grommets if worn or missing replace them If cracked out of balan...

Page 17: ...externally mounted Replace if open If the compressor temperature is high remove the overload cool it and retest Check the voltage See the limits on the preced ing page If not within limits call an electrician Check overload if externally mounted Replace if open If the compressor temperature is high remove the overload cool and retest If not running determine the cause Replace if required Remove th...

Page 18: ...ing air guide rearrange the air handling parts Remove the cabinet and carefully rearrange tubing not to contact cabinet compressor shroud and barrier Set the knob to HIGH COOL or LOW COOL while rocker switch is ON Check terminals If loose repair or replace Check the synchronous motor for open circuit Capacitor Wiring Refrigerating system Air filter Exhaust damper door Unit undersized Blower or fan...

Page 19: ...T DIAGRAM POWER CORD ROTARY SWITCH FAN MOTOR CAPACITOR THERMOSTAT COMPRESSOR 1 2 3 4 5 6 1 1 1 1 1 1 LOCATION NO DESCRIPTION REMARKS 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 ...

Page 20: ... 135313 147581 1 147581 2 135312 552102 W52106 W52106 554031 148000 352390 349600 346811 130410 354210 147582 349001 249950 W48602 559010 149980 550140 554160 352113 35211A 269310 W0CZZ 135500 146812 266003 264110 137215 149410 266002 130910 135515 ...

Page 21: ...z LGservice com 137215 PANEL ASSEMBLY CONTROL 3721A20002A 3721A20002A R 146812 MOTOR ASSEMBLY SYNC 2H01102A 2H01102A R 147581 1 LOUVER HORIZONTAL 5990A20032A 5990A20032A R 147581 2 LOUVER HORIZONTAL 5990A20033A 5990A20033A R 147582 LOUVER VERTICAL 4758AR6157A 4758AR6157A R 148000 BRACE 4800AR7272A 4800AR7271A R 149410 KNOB ASSEMBLY 4941A30001A 4941A30001A R 149980 SHROUD 4998A10027A 4998A10027A R ...

Page 22: ...3H02932C 3H02932C R PART NO DESCRIPTION REMARK LOCATION NO BWC186MBAB0 BWC226NBAB0 NOTE Please ensure GCSC since these parts may be changed depending upon the buyer s request GCSC WEBSITE http biz LGservice com W52106 1 TUBE EVAPORATOR 5210A30009X 5210A30144U R W52106 2 TUBE EVAPORATOR 5210A30009W 5210A30144V R 559010 FAN ASSEMBLY AXIAL 5900AR1330B 5900AR1330B R ...

Page 23: ...P No 3828A20529G July 2007 Printed in Thailand ...

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