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23 Room Air Conditioner

Troubleshooting Guide

Troubleshooting Guide

Piping System

Figure 32 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 32

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Содержание LW1815HR

Страница 1: ...tp www lgservice com BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL ONLY FOR AUTHORIZED SERVICE PERSONNEL MODEL LW1815HR LW2415HR BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL ONLY FOR AUTHORIZED SERVICE PERSONNEL ...

Страница 2: ...ements 9 Installation Kits Contents some models including installation kit 10 Suggested tool Requirements 10 Cabinet Installation 11 Operation 13 Disassembly instructions 14 Mechanical parts 14 Air Handling Parts 15 Electrical Parts 16 Refrigeration cycle 19 Schematic Diagram 22 Troubleshooting guide 23 Piping System 23 Troubleshooting guide 24 Room Air Conditioner Voltage Limits 26 Exploded View ...

Страница 3: ...indications Meanings of symbols used in this manual are as shown below WARNING CAUTION This symbol indicates the possibility of death or serious injury This symbol indicates the possibility of injury or damage to property only WARNING Installation Do not use damaged power cord plugs or a loose socket There is risk of fire or electric shock Always use the power plug and socket with the ground termi...

Страница 4: ...ing and installing the product Sharp edges could cause injury Be especially careful of the case edges and the fins on the condenser and evaporator Do not store or use flammable gas or com bustibles near the air conditioner There is risk of fire or failure of product Be sure the installation area does not deterio rate with age If the base collapses the air conditioner could fall with it causing pro...

Страница 5: ...k This symbol alerts you to hazards that could cause harm to the air conditioner This symbol indicates special notes NOTICE Symbols Used in this Manual Service Manual 5 W mm inch 660 26 660 26 H mm inch 428 16 27 32 428 16 27 32 D mm inch 675 26 9 16 770 30 5 16 Model Dimension LWHD1800HR LWHD2400HR ...

Страница 6: ... Amps Heating 15 0 16 0 15 0 16 0 Features Thermostat Control Thermistor Thermistor Air Diflection 4 Way 4 Way Remote controller Yes Yes Auto swing Yes Yes Auto Restart Yes Yes Energy saver Fuction Yes Yes Timer 24Hr On Off 24Hr On Off Filter Alarm Function Yes Yes Fan Speed Cooling Heating 2 2 2 2 Fan Only 2 2 Compressor Rotary Rotary In Door Fan Type BLOWER BLOWER Type Air Discharge Side by side...

Страница 7: ...om 8 The power cord must be connected to an independent cir cuit 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 The grille is designed to clean the filter both upward and downward A BEFORE ATTACHING THE FRONT GRILLE TO THE CAB INET IF YOU WANT TO PULL ...

Страница 8: ...sufficiently to allow a clear vertical opening of 18 from the bot tom 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 Installation Kits Contents some models including installation kit Foam PE Adhesive Backed Foam PE Adhesive Backed Type C 5 Type D 2 Type A 14 Carriage Bolt 2 Lock Nut 4 Top retainer bar Type B 7 Foam strip Plain Bac...

Страница 9: ...al to the proper length Peel off the backing and attach the Foam PE to the underside of 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 Fram...

Страница 10: ...ts outward CAUTION 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 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 int...

Страница 11: ...insert between the upper window sash and the lower window sash See Fig 12 9 Attach the Window locking bracket with a screw Type C See Fig 13 10 Attach the front grille to the cabinet by inserting the tabs on the grille into the tabs on the front of the cabi net Push the grille in until it snaps into place See Fig 34 11 Lift the inlet grille and secure it with a screw Type A through the front grill...

Страница 12: ...PERATURE SETTING BUTTON This button can automatically control the temperature of the room The temperature can be set within a range of 60 F to 86 F by 1 F 6 AUTO SWING This button can automatically control the air flow direction 7 ENERGY SAVER The fan stops when the compressor stops cooling Approximately every 3 munutes the fan will turn on and check the room air to determine if cooling is needed ...

Страница 13: ...ews which fasten the cabinet at both sides Keep these for later use 2 Remove the two screws which fasten the cabinet at back See Fig 17 3 Pull the base pan forward 3 Control box 1 Remove the front grille Refer to section 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 18 3 Remove the 3 screws which fasten the controlbox See...

Страница 14: ...e 3 screws which fasten the evaporator at the left side and the top side See Fig 19 3 Move the evaporator sideward carefully 4 Remove the 2 terminals carefully See Fig 20 5 Remove the 3 screws which fasten the Heater Cover See Fig 20 6 Remove the Heater Cover See Fig 20 7 Remove the orifice from the air guide carefully See Fig 21 8 Remove the clamp which secures the blower with plier See Fig 21 9 ...

Страница 15: ...in control box Refer to section 3 3 Remove the blower Refer to section 5 4 Remove the fan Refer to section 6 5 Remove the 4 screws which fasten the motor See Fig 25 6 Remove the motor 7 Re install the components by referring to the removal procedure above 9 Compressor 1 Remove the cabinet Refer to section 2 2 Discharge the refrigerant system using FreonTM Recovery System If there is no valve to at...

Страница 16: ...nnect the grounding screw from the control box 4 Disconnect 2 receptacles 5 Remove a screw which fastens the clip cord 6 Pull the power cord See Fig 28 7 Re install the component by referring to the removal procedure above Use only one ground marked hole for ground connec tion 8 If the supply cord of this appliance is damaged it must be replaced by the special cord The special cord means the cord ...

Страница 17: ...to section 3 2 Unfold the control box Refer to section 10 3 Remove the crankshaft 4 Disconnect all the leads of the synchronous motor 5 Remove the 2 screws which fasten the synchronous motor See Fig 30 6 Re install the components by referring to the removal procedure above Figure 30 ...

Страница 18: ...ctions 6 Remove the condenser 7 Re install the components by referring to notes See Fig 31 17 EVAPORATOR 1 Remove the cabinet Refer to section 2 2 Remove the top cover and the brace Refer to section 4 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 interconnectin...

Страница 19: ...he manifold 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 35B With valve C open discharge the ...

Страница 20: ...of making a leak 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 31A Pulling Vacuum Figure 31B Charging A B EXTERNAL VACUUM PUMP A CHARGING CYLINDER LOW HI B C ...

Страница 21: ...Service Manual 22 Schematic Diagram Schematic Diagram Wiring Diagram ELECTRIC HEATING MODEL ...

Страница 22: ...e 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...

Страница 23: ... 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 Check cold air circulation for smooth flow D...

Страница 24: ...rregular 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 to start Defect of compressor capacit...

Страница 25: ...ntion 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 or noise appears to be internal while running replace motor Check voltage If not within lim...

Страница 26: ... 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 of replace Close if open Determine if the unit is properly sized for the area to be cooled Check the set screw or clamp If loose or missing ...

Страница 27: ...010 554030 148000 352390 349600 346811 130410 354210 147582 349001 359012 749740 W48602 W48602 559011 550140 554160 W52106 352113 35211A 352111 567480 268711 1 146812 264110 267110 137215 238310 W0CZZ 249950 135500 130910 753000 731273 268711 2 135301 145200 W4430 552111 ...

Страница 28: ...P No 3828A20841B March 2007 Printed in China ...

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