LG LP-C303R20 Service Manual Download

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Floor Standing Type
Air Conditioner

SERVICE MANUAL

MODEL: LF300CP(LP-C303R20)

LF480CE(LP-C483TA0)

Summary of Contents for LP-C303R20

Page 1: ...Floor Standing Type Air Conditioner SERVICE MANUAL MODEL LF300CP LP C303R20 LF480CE LP C483TA0 ...

Page 2: ...autions 3 Functions 7 Product Specifications 10 Dimensions 11 Wiring Diagram 15 Operation Details 17 Installation of Indoor Outdoor Unit 23 Test Running 25 Troubleshooting Guide 27 Exploded View and Replacement Parts List 41 ...

Page 3: ... properties only Installation Be sure not to do Be sure to follow the instruction Do not use a defective or underrated circuit breaker Use this appliance on a dedicated circuit There is risk of fire or electric shock Always ground the product There is risk of fire or electric shock Install the panel and the cover of control box securely There is risk of fire or electric shock Always install a dedi...

Page 4: ... may cause injury accident or damage to the product Be sure the installation area does not deteriorate with age If the base collapses the air conditioner could fall with it causing property damage product failure and personal injury Do not let the air conditioner run for a long time when the humidity is very high and a door or a window is left open Moisture may condense and wet or damage furniture...

Page 5: ...ways check for gas refrigerant leakage after installation or repair of product Low refrigerant levels may cause failure of product Install the drain hose to ensure that water is drained away properly A bad connection may cause water leakage Do not store or use flammable gas or combustibles near the product There is risk of fire or failure of product If strange sounds or small or smoke comes from p...

Page 6: ...mage to the plastic parts of the product Do not touch the metal parts of the product when removing the air filter They are very sharp There is risk of personal injury Do not step on or put anyting on the product outdoor units There is risk of personal injury and failure of product Do not insert hands or other objects through the air inlet or outlet while the product is operated There are sharp and...

Page 7: ...lay Safety Control AutoRestart Cooling Heating Soft Dry Fan High Med Low Maintains the room temperature in accordance with the Setting Temp Up up to 30 C 86 0 F Down down to 16 C 60 8 F Heat exchanger temperature sensor Thermistor Intermittent operation of fan at low speed Restarting is inhibited for approx 3 minutes The power comes on again after a power failure Functions ...

Page 8: ...r Airflow direction Auto swing and Manual Contol Up up to 30 C 86 0 F Down down to 16 C 60 8 F High Med Low Remote Control Operation ON OFF Cooling Operation Mode Heating Operation Mode Sot Dry Operation Mode Fan Operation Timer Control Airflow Direction Control Room Temperature Control Indoor Fan speed control ...

Page 9: ... 9 Outdoor Unit Deice Control Outdoor Fan Speed Control Sensing Heat Exchanger Temperature De ice PCB Heating Model Only One speed Heat exchanger temperature sensor Thermistor ...

Page 10: ... BREAKER CAPACITY A 1 208 230 60 1 208 230 60 28 000 48 000 8 206 14 067 2 600 4 500 11 5 20 LG LG Rotary Rotary QJ250KAB QK145KBD QP325KBD 2 17 658 10 100 24000 7 7 4 5 10 2 1 635 935 2162 50 45 39 32 57 54 51 56 62 20 16 5 13 6 706 583 459 212 35 33 30 1 236 1 165 1 059 47 1 660 104 3 672 1 84 65 3 92 124 2 2R 30C 18FPI 3R 28C 18FPI 2R 36C 20FPI 2R 26C 21FPI TURBO FAN TURBO FAN Propeller Propell...

Page 11: ...y Panel Antibiotic Filter Air Inlet Air Inlet Antibiotic Filter Plasma Deodorant Air Cleaner Remote Controller Holder Control Panel Top Bottom Airflow Controller Left Right Airflow Controller Air Outlet Bottom Panel Ground Terminal Refrigerant Pipe Port Air Inlet back side Control Cover Dimensions Indoor Unit LPNC303R20 LF300CP Outdoor Unit LPUC303R20 LF300CP ...

Page 12: ...0mm 12 6inch 546mm 21 5inch 5 3 1 2 4 1820mm 71 7inch 570mm 22 4inch 311mm 12 2inch 180mm 7 1inch 101mm 4 0inch No Items 1 Control Display 2 Air outlet vent 3 Air inlet vent No Items 1 Gas side service valve Ø 15 88mm 5 8inch 2 Liquid side service valve Ø 9 52mm 3 8inch 3 Fan cover 4 Earth screw 5 Connecting cable hole ...

Page 13: ...Air Intake Vent Rear Air Outlet Vent Piping Air Outlet Vent Remote Signal Receptor Air Intake Vent 13 Indoor Unit LPNC483TA0 LF480CE door Unit LPUC483TA0 LF480CE ...

Page 14: ...ch 338mm 13 3inch 486mm 19 1inch 439mm 17 3inch 139mm 15 5inch 134mm 5 3inch 1540mm 60 6inch 1850mm 72 8inch 260mm 10 2inch 260mm 10 2inch 525mm 20 7inch 950mm 37 4inch 79mm 3 1inch 590mm 23 2inch 562mm 22 1inch 1 2 3 No Items 1 Air Outlet Vent 2 Liquid Side SVC Valve Ø 9 52mm 3 8inch 3 Gas Side SVC Valve Ø 19 05mm 3 4inch 4 Control Box 5 Earth Screw No Items 1 Air Outlet Vent 2 Air Inlet Vent 3 C...

Page 15: ...Wiring Diagram 1 LF300CP LP C303R20 Outdoor 15 ...

Page 16: ... 16 2 LF480CE LP C483TA0 Outdoor ...

Page 17: ...trol Button to set the louver as the desired position Remote controller 3 Cooling Mode Operation When selecting the Cooling Mode Operation the unit will operate according to the setting by the controller and the operation diagram is as following Intake Air temp Setting Temp 1 C 1 8 F Compressor ON Setting Temp 1 C 1 8 F Compressor OFF Indoor Fan Speed Selecting fan speed Selecting fan speed Select...

Page 18: ...5 0 F Discharge air Temperature to be less than 29 C 84 2 F The indoor fan operates for minimum 10sec even if falls lower than 34 C 93 2 F Low V Stop VI 39 C 102 2 F Discharge Air Temp Indoor Pipe Temp 34 C 93 2 F 28 C 82 4 F 26 C 78 8 F Selecting Fan Speed IV Low II Stop I Hot Start Operating Heating Start Hot Start Release Point Selecting Fan Speed III During heating operation the operating proc...

Page 19: ...Defrost ends after 10 minutes pass from starting of defrost operation or when the outdoor pipe temperature rises over 12 C 53 6 F even if before 10 minutes The second defrost starts only when the outdoor pipe temperature falls below 6 C 21 2 F after 45 minutes pass from ending of the first defrost and more than INDOOR PIPE TEMP INDOOR FAN SPEED Selecting fan speed OFF OFF LOW 1min Maximum COMPRESS...

Page 20: ...the compressor OFF temperature is the setting temperature minus 1 C 1 8 F When the room temperature rises over the compressor ON temperature the operation mode is switched to the Cooling mode When the room temperature falls between the compressor ON temperature and OFF temperature the operation mode is switched to the Soft Dry Operation The operation diagram is shown below Intake Air Temp Indoor F...

Page 21: ...4 AUTO RESTART In case the power comes on again after a power failure Auto Restarting Operation is the function to operate procedures automatically to the previous operating conditions 15 Function of changing set temperature when re operation after stop Operation is set the following condition when re operation with start stop button 1 Operation mode Cooling soft dry mode Cooling mode Heating mode...

Page 22: ... by cooling Fan speed is high comp on and Auto air flow operations without setting temperature 2 Operation or Cancel Do test operation if you push ON OFF button and the down room temperature checking button over 3 seconds at the same time During the operation if you push the stop button or push ON OFF button and the down room temperature checking button over 3 seconds at the same time the test ope...

Page 23: ...g is built over the unit to prevent direct sunlight or rain exposure be careful that heat radiation from the condenser is not restricted There should not be any animals or plants which could be affected by discharged hot air Ensure the space indicated by arrows from the wall ceiling fence or other obstacles Installation of Indoor Outdoor Unit A B Indoor unit Outdoor unit 50mm 2inch 1000mm 39 4inch...

Page 24: ...e building mount the rubber underneath the outdoor unit 4 Refrigerant amount Before shipment this air conditioner is filled with the rated amount of refrigerant including additional amount required for air purging subject to 7 5m 25ft piping length The rated amount of refrigerant is indicated on the name plate But when the piping length exceeds 7 5m 25ft additional charge is required according to ...

Page 25: ...ompressive pressure As to the structure and appearance check following items 2 Connection of power supply 1 Connect the power supply cord to the independent power supply Circuit breaker is required 2 Operate the unit for fifteen minutes or more 3 Evaluation of the performance 1 Measure the temperature of the intake and discharge air 2 Ensure the difference between the intake temperature and the di...

Page 26: ...on Particularly note the relation between cable length and thickness 8 Never fail to equip a leakage breaker where it is wet or moist 9 The following troubles would be caused by voltage drop down Vibration of a magnetic switch damage on the contact point there of fuse breaking disturbance to the normal function of a overload protection device Proper starting power is not given to the compressor Te...

Page 27: ...of fan motor Improper electric heater Replacement of electric heater Regular but fails to start Replacement of compressor Electric heater is not energized Loose terminal connection Improper wiring Irregular motor resistance Ω Irregular motor insulation Ω Replacement of compressor Drop of power voltage Capacitor check Replacement Compressor only fails to start Defect of compressor capacitor Check p...

Page 28: ...ter in case that the same power source is supplied to other equipment than the unit what and where trouble can be discovered by checking the operation of other equipment Measure it with a tester Make short circuit then measure it with a tester Check it with the eyes or tester Check it with the eyes or tester Repair a switch box and is relative instrument Replacement of fuse Request a power supplie...

Page 29: ...for compressor motor Compressor motor Compressor High pressure switch Electric circuit Defective contact magnetic coil troubled Troubled over heated layer short Troubled or over heated lock Troubled or defective contact or operating Defective connection or disconnection of the circuit for compressor Check it with the eyes on with a tester Check how it is insulated Groaned noise of motor Check it w...

Page 30: ... the event that difference between the saturating temperature corresponding to high pressure and the temperature of air discharged from the outdoor coil is more than 15 C incondensable gas may be blended Check it with a pressure gauge Confirm the wind blowing out Check it with eyes Open it properly Wash it by means of something like chemical washing Extract air by vacuum pump then recharge the ref...

Page 31: ...orrect it Correct it Replenish it Repair the leakage spot Correct or clear the foreign bodies Cleaning 9 4 All the functions are performed normally but very noisily and much vibratively WHAT TROUBLED COMPLAINTS HOW TO CHECK REMEDY Compressor Blower Screws Checking Checking Checking Checking Remove the shipping bracket Replace the compressor Repair or replace it Clear the other material Repair Liqu...

Page 32: ...ot or excessive air flow through the evaporator coil Refrigerant over charge Faulty discharge valve or suction valve of the compressor Discharge pressure is higher than standard Intake air extremely cold or insufficient air flow through the evaporator coil Refrigerant short charge or leakage Restricted liquid in the suction line 1 Check the operation of the outdoor motor 2 Check discharge and suct...

Page 33: ...ine and the contactor Check the voltage and phase unbalance Add refrigerant repair leakage if any Check thermistor operation or any other cause for frequent stop and start operation See High Discharge Pressure or High Suction Pressure Check the voltage and phase unbalance Check the power supply line and the contact Check electric resistance among the compressor terminals and from the terminals to ...

Page 34: ...OFF S W ON Is the unit operating Istheinputpower AC220V AC240V atCOMP Magnetic coil Check the magnetic contactor of outdoor unit Is it Cooling mode Room temp Set temp Is the DC5V at 14 pin of MICOM Replacement IC02M RY COMP Replacement MICOM Room temp set temp setting Select the cooling operation mode Check the wiring diagram Electronic Parts Troubleshooting Guide ...

Page 35: ...DC12V at each terminal RY Mid Coil Is the DC12V at each terminal RY S High Coil Is the AC220V 240V between C and S High of P C B Is the AC220V 240V between C and High of P C B Is the AC220V 240V between C and Mid of P C B Replacement ICO3M Replacement S High Check the motor winding Replacement High Replacement RY Mid Is the DC12V at each terminal RY High Coil Replacement MICOM and check the EVA Th...

Page 36: ...W ON Is the DC5V at 16 terminal MICOM Is the DC12V at each terminal RY Sync COIL Check the synchronous motor winding Replacement RY Sync Check synchronous connector contact point Is the AC220V 240V at each terminal SYN MOTOR CONNECTOR Replacement ICO2M Replacement MICOM The power ON OFF S W ON Press the Auto Swing S W ...

Page 37: ...e battery of remote controller normal Check the connector CN Disp1 Is the CN Disp1 connector normal Does the operation of remote controller properly Is the Pre amp of display normal Replacement MICOM Replacement preamp assy Replacement remote controller Replacement battery ...

Page 38: ...at Trans input terminal Is the AC12 18V at Trans 2nd Is the connector of Main Display correct Is the DC5V between PIN64 and PIN 32 of MICOM Replacement Main PCB ASM 1 Replacement ICO3D 2 Replacement Main PCB ASM Check the connector of Main Display Replacement Trans 1 Check the electric connections 2 Check the fuse of Main PCB ASM ...

Page 39: ... terminal Is the DC5V at 18 pin of Micom terminal Is the DC12V at each terminal RY 4way COIL Isthe AC220V AC240V between connector 4WAY andCN outunitPin1of Main P C B Is the DC12V at each terminal Replacement RY 4way Replacement ICO2M Replacement RY Comp IstheAC220V AC240V betweenconnector CN outunit Pin1andPin3ofMain P C B Replacement MICOM Replacement ICO2M Room temp Set temp Setting Replacement...

Page 40: ...g Is the Heat S W of Main PCB ON Heat S W ON Replacement MICOM Replacement ICO2M Replacement RY Heater Is the DC 5V at 15 pin of MICOM Is the DC 12V at eack terminal RY Heater COIL Isthe AC220V AC240V between connector HEATER andCN outunitPin1 ofMainP C B Check the heater wiring Select the heating operation mode Compressor ON ...

Page 41: ...Exploded View and Replacement Parts List 41 267110 237201 135313 1 135313 2 235811 2 235811 1 137211 132100 235512 249941 268711 1 249951 159830 W0CZZ 268711 2 1 Indoor Unit Model LF300CP LP C303R20 ...

Page 42: ... 42 130911 35211C 354210 W4811 1 567480 3 Eva out 336610 W4810 1 730700 346810 359012 W1NF 140570 W1WE 349480 567480 1 Inlet air 159830 1 337000 266000 352150 336600 W4810 2 W4811 2 135515 W52103 35211A ...

Page 43: ...8711 1 567480 1 Inlet air 567480 3 Eva out W4810 2 137211 237202 35211A 35211C 152302 135313 330870 146812 W4810 1 354210 552111 W4811 267110 135080 2 135310 146811 135080 1 135080 3 135080 4 Model LF480CE LP C483TA0 ...

Page 44: ... 44 359012 346810 150170 130400 349480 135317 135500 268711 2 249941 249951 W4810 W0CZZ 336610 135515 130911 349600 ...

Page 45: ...435512 437210 349480 1 447910 559010 546810 349600 W0CZZ 2 W0CZZ 1 W6920 W5210D 552113 552201 554160 1 554160 2 552200 661400 649950 554030 137213 1 435300 137213 2 435511 552203 1 552203 2 430410 435301 268711 4 548490 567480 4 552112 Air Accum ...

Page 46: ...CE LP C483TA0 437212 435512 435301 437210 559010 137213 435511 546810 447900 554031 552203 2 552203 1 430411 349600 1 W5210D 554160 552112 552201 552200 661400 552113 649950 W0CZZ 1 268711 4 567480 4 Air Accum 548490 ...

Page 47: ...P No 3828A20156T December 2006 Printed in Korea ...

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