LG WG1800R 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: 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

Summary of Contents for WG1800R

Page 1: ...S 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 ...

Page 2: ... SYNCHRONOUS MOTOR 8 2 4 REFRIGERATION CYCLE 9 2 4 1 CONDENSER 9 2 4 2 EVAPORATOR 9 2 4 3 CAPILLARY TUBE 9 3 INSTALLATION 3 1 HOW TO INSTALL THE UNIT 12 3 2 HOW TO USE THE REVERSIBLE INLET GRILLE 12 3 3 WINDOW REQUIREMENTS 13 3 4 INSTALLATION KITS CONTENTS 13 3 5 SUGGESTED TOOL REQUIREMENTS 14 3 6 CABINET INSTALLATION 15 4 TROUBLESHOOTING GUIDE 4 1 OUTSIDE DIMENSIONS 17 4 2 PIPING SYSTEM 17 4 3 TR...

Page 3: ...R LWN2432QAS Y5USC24 6R LWC243NSMM0 LWN2433TCS LWC243NSMM2 HBLG2350E POWER SUPPLY COOLING CAPACITY Btu h INPUT W RUNNING CURRENT A REFRIGERANT CHARGE g OPERATING INDOOR C TEMPERATURE OUTDOOR C FAN INDOOR FAN OUTDOOR FAN SPEEDS FAN COOLING FAN MOTOR OPERATION CONTROL ROOM TEMP CONTROL AIR DIRECTION CONTROL CONSTRUCTION PROTECTOR COMPRESSOR FAN MOTOR POWER CORD DRAIN SYSTEM NET WEIGHT lbs kg OUTSIDE...

Page 4: ...tton again OPERATION MODE SELECTION BUTTON Select Cooling or Fan or Dehumidification Dry mode with button Dry mode is not to all models ON OFF TIMER BUTTON Set the time of starting and stopping operation The timer is set by 1 hour FAN SPEED SELECTOR Select the fan speed in three steps High F3 Low F1 Med F2 High F3 ROOM TEMPERATURE SETTING BUTTON Control the room temperature within a range of 60 F ...

Page 5: ...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 6: ...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 7: ...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 8: ...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 9: ...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 10: ...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 11: ...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 12: ...wer cord must be connected to an independent circuit The green wire must be grounded 9 Connect the drain tube to the base pan hole in the rear side if you need to drain consult a dealer Plastic hose or equivalent may be connected to the drain tube 3 2 HOW TO USE THE REVERSIBLE INLET GRILLE The grille is designed to clean the filter both upward and downward A BEFORE ATTACHING THE FRONT GRILLE TO TH...

Page 13: ...to allow a clear vertical opening of 18 from the bottom of the upper sash to the window stool 2 The stool offset height between the stool and sill must be less than 1 1 4 3 4 INSTALLATION KITS CONTENTS 29 to 41 18 min Offset Less than 1 1 4 Sill Exterior Interior wall 26 min Without frame curtain Stool Foam PE Adhesive Backed Foam PE Adhesive Backed Type C 5 Type D 2 Type A 14 Carriage Bolt 2 Lock...

Page 14: ... the window sash 4 Remove the backing from Foam PE with 3 holes and attach it to the bottom of the Top retainer bar 5 Attach the Top retainer bar onto the top of the cabinet with 3 screws Type A 6 Insert the Frame guides into the bottom of the cabinet 7 Insert the Frame Curtain into the Top retainer bar and Frame guides 8 Fasten the curtains to the unit with 10 screws Type A at both sides SCREWDRI...

Page 15: ...N Do not drill a hole in the bottom pan The unit is designed to operate with approximately 1 2 of water in bottom pan 4 Pull the bottom window sash down behind the Top retainer bar until they meet NOTE 1 Do not pull the window sash down so tightly that the movement of Frame curtain is restricted Attach the cabinet to the window stool by driving the screws Type B through the cabinet into window sto...

Page 16: ... the upper window sash and the lower window sash See Fig 29 9 Attach the Window locking bracket with a screw Type C See Fig 30 10 Attach the front grille to the cabinet by inserting the tabs on the grille into the tabs on the front of the cabinet Push the grille in until it snaps into place See Fig 31 11 Lift the inlet grille and secure it with a screw Type A through the front grille See Fig 31 12...

Page 17: ...3 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 18: ...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 19: ... 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 20: ...the connection 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...

Page 21: ... 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 22: ...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 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 pattern of Main Display PCB Possible Trouble 6 Romote controller does not operate Possible Trouble 5 The function of Energy Saver does n...

Page 23: ...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 24: ...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 25: ...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 26: ...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 27: ...A 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 RD BK PTC 4 3 WH BL POWER INPUT BK BR Ribbed Plain GN YL GN GN YL GN THERMISTOR BK BK BL RD BL RD CN TH 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 ...

Page 28: ...A SCL 11 TEST 15 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 1...

Page 29: ... 29 5 3 COMPONENTS LOCATION FOR MAIN P C B ASM 5 4 COMPONENTS LOCATION FOR DISPLAY P C B ASM ...

Page 30: ...2101 554031 148000 352390 349600 346811 130410 354210 147582 349001 359012 359012 349480 W48602 W48602 559010 731273 267110 149980 550140 554160 352113 35211A 352111 263230 268712 146812 264110 268714 237200 238310 W0CZZ 249950 135510 130910 W52106 2 W52106 1 352115 2 352115 1 ...

Page 31: ...A20043A 4681A20043A 4681A20043A 4681A20043A 4681A20011L R 349001 DAMPER VENTILATION 4900AR7265A 4900AR7265A 4900AR7265A 4900AR7265A 4900AR7265A 4900AR7265B R 349480 ORIFICE 4948AR7241A 4948A30006A 4948A30006A 4948A30006A 4948A30006A 4948A20014A R 349600 MOUNT MOTOR 4960AR1596A 4960A10006A 4960A10006A 4960A10006A 4960A10006A 4960AR2895B R 352111 TUBE ASSEMBLY CONNECTOR 5211AR7059H 5211AR7059Q 5211A...

Page 32: ...3K 4681AR6033K R 349001 DAMPER VENTILATION 4900AR7265A 4900AR7265A 4900AR7265A 4900AR7265A 4900AR7265A 4900AR7265A R 349480 ORIFICE 4948A30006A 4948A30006A 4948A30006A 4948A30006A 4948A30006A 4948A30006A R 349600 MOUNT MOTOR 4960AR1596A 4960AR1596A 4960AR1596A 4960AR1596A 4960AR1596A 4960AR1596A R 352111 TUBE ASSEMBLY CONNECTOR 5211AR7059A 5211AR7059A 5211AR7059A 5211AR7059A 5211AR7059A 5211AR7059...

Page 33: ... 6871A20188J R 346811 MOTOR ASSEMBLY AC 4681A20043A 4681A20043A 4681A20011L 4681A20011L R 349001 DAMPER VENTILATION 4900AR7265A 4900AR7265A 4900AR7265A 4900AR7265A R 349480 ORIFICE 4948A30006A 4948A30006A 4948A20014A 4948A20014A R 349600 MOUNT MOTOR 4960A10006A 4960A10006A 4960AR2895B 4960AR2895B R 352111 TUBE ASSEMBLY CONNECTOR 5211AR7059Q 5211AR7059X 5211A10067F R 352113 TUBE ASSEMBLY DISCHARGE ...

Page 34: ... 34 MEMO ...

Page 35: ...P No 3828A20095H September 2006 Printed in Korea ...

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