Service Manual - Appliance Factory Parts
Contents
1. A WARNING Installation Do not use a defective or Always ground the product Install the panel and the cover underrated circuit breaker Use of control box securely this appliance on a dedicated circuit There is risk of fire or electric There is risk of fire or electric There is risk of fire or electric shock shock shock ES gt 4 7 jes Always install a dedicated Use the correctly rated Do not modify or extend the circuit and breaker breaker or fuse power cable Improper wiring or installation may There is risk of fire or electric There is risk of fire or electric cause fire or electric shock shock shock 23 Copyright 2007 LG Electronics Inc All right reserved LGE Internal Use Only Only for training and service purposes Do not install remove or re Be cautious when unpacking For installation always install the unit by yourself and installing the product contact the dealer or an customer Authorized Service Center There is risk of fire electric shock Sharp edges could cause injury There is risk of fire electric shock explosion or injury Be especially careful of the case explosion or injury edges and the fins on the condenser and evaporator Do not install the product ona sure the installation area Do not let the air conditioner defective installation stand does not deteriorate with age run for a long time when the humidit2. Is the DC12V at each terminal RY Mid Coil Is the DC12V at each terminal RY S High Coil Is the DC12V at each terminal RY High Coil NO Replacement ICO3M Is the ls the NO_AC220V 240W between pee pation AC220V 240V PCB of PC B YES Replacement S High Replacement High Replacement RY Mid Check the motor winding Copyright 2007 LG Electronics Inc All right reserved 35 Only for training and service purposes POE intemal Use Only 3 Airflow Direction does not operate Is the unit operating The power ON OFF S W ON Is the Auto Swing S W Press the Auto Swing S W s the at 16 terminal Replacement MICOM MICOM Is the DC12V at each terminal Replacement ICO2M RY Sync COIL Is the 220 240 Replacement RY Sync TUR CONNECTOR Check synchronous connector contact point Check the synchronous motor winding Copyright 2007 LG Electronics Inc All right reserved 36 Only for training and service purposes LGE 4 Remote control does not operate Is the battery of remote controller normal Is the CN Disp1 connector normal NO Check the connector CN Disp1 Does the operation of remote controller properly Replacement remote controller Is the Pre amp of display normal Replacement preamp assy Replacement MICOM
3. Improper electric heater Irregular motor resistance Replacement of electric Regular but fails to start Replacement of compressor Irregular motor insulation 2 heater Replacement of compressor Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes 27 PACKAGE AIR CONDITIONER VOLTAGE LIMITS NAME PLATE RATING MINIMUM MAXIMUM 380 V 342 V 418 V 220V 198 V 242 V 380 415 V 342 V 456 V No cooling and heating operation performed WHAT TROUBLED COMPLAINTS HOW TO CHECK REMEDY Other parts than the unit Electric supply interrupted Defective power wiring Cut of power fuse Measure it with a tester 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 Repair a switch box and is relative instrument Replacement of fuse Request a power supplier to repair Too low voltage Measure it with a tester Check the power source Use a thick cable if necessary Magnetic switch for compressor amp fan motor Control point is on condition of OFF due to trouble Make short circuit then measure it with a tester Replace it if necessary Operating switch Troubled or defective contactor Check it with the eyes or tester Repair or replace it Protection devices Opened the cont
4. CHECK THE FOLLOWING ITEMS WHEN INSTALLATION IS COMPLETE After completing work be sure to measure and record trial run properties and store measured data etc Measuring items are room temperature outside temperature suction temperature blow out temperature wind velocity wind volume voltage current presence of abnormal vibration and noise operating pressure piping temperature compressive pressure As to the structure and appearance check following items Is the circulation of air adequate Is the remote controller switch operated Is the draining smooth Is there any faulty wiring Is the heat insulation complete Are not terminal screws loosened refrigerant and drain piping Is there any leakage of refrigerant 4 118 cm 12kgf cm M5 196N cm 20kgf cm 0 8 Ibf ft 10 Ibf in 1 4 Ibf ft 17 Ibf in M6 245N cm 25kgf cm 8 588 cm 60kgf cm 1 8 Ibf ft 22 Ibf in 4 3 Ibf ft 52 Ibf in 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 discharge one is more than 8 C 46 4 F Cooling or reversely Heating Copyright 2007 LG Electronics Inc All right reserved
5. LGE Internal Use Only Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes 622 2 2252 X 95 M 5 Inlet air SN LGE Internal Use Only 42 Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes e Model LF480CE LP C483TAO Copyright 2007 LG Electronics Inc All right reserved 43 Only for training and service purposes POE intemal Use Only LGE Internal Use Only 44 Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes 2 Outdoor
6. Mode Selecting Operating Mode Fan Speed Outdoor OFF Initial Starting of Outdoor not operating Low at the initial Air purifying Fano 1 But could be perating Air OFF Repress Air Operation purifying operating switched to Med Hi purifying Button or ON OFF When switched to Outdoor operating Selecting Speed of ONorOFF Button Air purifying Main Operating Main Operating Mode depend on man operation Air purifying operating operating condition 11 Child Lock function This function is to operate Air conditioner only by Remocon The procedure is as the following 1st Press the 2 buttons of the temperature control simultaneously to raise to lower on the Display Panel of the product for more 3 seconds 2nd The buzzer sounds and then the window of Display Panel shows CL mark 3rd To release this function the reverse again the operating procedure could be done During this function is operating any buttons of Display Panel don t work But it is possible to operate with Remote controller Copyright 2007 LG Electronics Inc All right reserved 20 Only for training and service purposes LGE Internal Use Only 12 Alarm mode display only displayed while operating The sensor for sensing room temperature is open or short The sensor for sensing piping temperature is open or short 13 Energy Saving If setting temperature of starting energy saving operation is under 22 C
7. 14 57 SVC LIQUID mm 9 52 3 8 9 52 3 8 VALVE GAS Inch 15 88 5 8 19 05 3 4 POWER CABLE P mm 3 4 0 3x5 5 CONNECTING CABLE P mm 4x1 0 4x1 0 BREAKER CAPACITY A 30 40 Copyright 2007 LG Electronics Inc All right reserved 10 LGE Internal Use Only Dimensions Indoor Unit LPNC303R20 LF300CP Top Bottom Airflow Controller Left Right Airflow Controller Cool air outlet 2 sides by Manual operation Cool air outlet front side Top Bottom Airflow Controller Left Right Airflow Controller Sliding Clean Door Control Panel Remote Controller Holder Display Panel Antibiotic Filter Plasma Deodorant Air Cleaner Air Inlet Antibiotic Filter Air Inlet Outdoor Unit LPUC303R20 LF300CP Control Cover Air Inlet back side Air Outlet Bottom Panel Ground Terminal Refrigerant Pipe Port Copyright 2007 LG Electronics Inc All right reserved 11 Only for training and service purposes Pee intemal Indoor Unit 1820mm 71 7inch 570mm 22 4inch 311mm 12 2inch No Items Control Display Air outlet vent Air inlet vent Outdoor Unit 546mm 21 5inch 320mm 12 6inch 870mm 34 3inc
8. 25 Only for training and service purposes LGE Internal Use Only CAUTION After the confirmation of the above conditions prepare the wiring as follows 1 Never fail to have an individual power specialized for the air conditioner As for the method of wiring be guided by the circuit diagram pasted on the inside of control box cover 2 Provide a circuit breaker switch between power source and the unit 3 The screw which fasten the wiring in the casing of electrical fittings are liable to come loose from vibrations to which the unit is subjected during the course of transportation Check them and make sure that they are all tightly fastened If they are loose it could give rise to burn out of the wires 4 Specification of power source 5 Confirm that electrical capacity is sufficient 6 Be sure that the starting voltage is maintained at more than 90 percent of the rated voltage marked on the name plate 7 Confirm that the cable thickness is as specified in the power sources specification 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 HAND OVER Teach th
9. C 53 6 F Defrost OFF 6 C 21 2 F Defrost ON Indoor Fan Compressor 4 Way Valve Copyright 2007 LG Electronics Inc All right reserved 19 Only for training and service purposes LGE Internal Use Only 8 Soft Dry Operati on Mode During Soft Dry Operation the compressor ON temperature is the setting temperature plus 2 C 3 6 F 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 Setting Temp 2 C 3 6 Compressor ON Setting Temp 1 C 1 8 F Compresso OFF Operation Dry operation Cooling Cooli Cooling operation al min maximum 0 min gt 41 Indoor Fan Speed Selecting fan speed Selecting fan speed Compressor ON 9 Protection of the evaporator pipe from frosting Compressor and outdoor fan stop when indoor pipe temperature is below 2 C 28 4 F and restart at the pipe temperature is above 12 C 53 6 F ON 10 Air Purifying Operation AP Z286RCO AP Z286R20 2488 0
10. Unit Model LF300CP LP C303R20 27 T N 27242222 5 777727 2707 2 Internal OLP type compressors Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes 45 LGE Internal Use Only e Model LF480CE LP C483TAO Internal OLP type compressors 44 7 Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use On
11. Vent 2 Liquid Side SVC Valve O 9 52mm 3 8inch 3 Gas Side SVC Valve 19 05mm 3 4inch 4 Control Box 5 Earth Screw Copyright 2007 LG Electronics Inc All right reserved 14 LGE Internal Use Only Only for training and service purposes Wiring Diagram 1 LF300CP LP C303R20 e 7 6 MAIN AC PCB ASM 4 5 DO2K 412 FUSE 250V s Jug VARISTER RY LOW Oo D bL MAIN ASM CAPACITOR CN ACIM gr RY OPEN L DOOR 7 RY CLOSE UPPER L POWER SUPPLY 10 208 230V 60Hz 5 CN CAPACITOR B CAPACITOR A UP DOWN Moon OUTLET CN ROOM NOTE TH BL BLUE OR ORANGE RIGHT OUTLET lo o BK BLACK WH WHITE EL BR BROWN YL YELLOW N DOOR SENSOR PHOTOSENSOR THERMSTOR RD RED GN YL GREEN YELLOW Comp B T B TERMINAL BLOCK MAIN DC PCB ASM Comp COMPRESSOR FMo MOTOR 3854A20445N Outdoor FRSE 250V 3A 3dld 05 35 HOSN3S VARISER HOOQNI OL FUSE 250V 5A RY COMP B POWER SUPPLY 10 208 230V 60Hz CAPACITOR B CAPACITOR A NOTE BL BLUE OR O
12. outunit Pin 1 of Main PCB Replacement RY 4way Is the DC12V at each terminal Replacement 2 Is the AC220V AC 240 V between connector CN outunit Pin 1 and Pin 3 of Main PCB Replacement RY Comp YES Copyright 2007 LG Electronics Inc All right reserved 39 Only for training and service purposes LGE Internal Use Only 8 No heater operation works Select the heating operation mode Is the heating operating Is the Compressor operating Compressor ON Is the Heat S W of Main PCB ON Heat S W ON Is the DC 5V at 15 pin of MICOM Replacement MICOM Is the DC 12V at eack terminal RY Heater COIL Replacement ICO2M Is the AC220V AC 240 V between connector HEATER and CN outunit Pin 1 of Main PC B Replacement RY Heater Check the heater wiring Copyright 2007 LG Electronics Inc All right reserved 40 Only for training and service purposes LGE Internal Use Only Exploded View and Replacement Parts List 1 Indoor Unit e Model LF300CP LP C303R20
13. 1 Operation mode Cooling soft dry mode Cooling mode Heating mode Heating mode 2 Setting the set temperature when cooling operation Room temperature gt Set temperature to be set to the previous set temperature Room temperature lt Set temperature a Room temperature gt 26 C 78 8 F to be set to 24 C 75 2 F b 22 C 71 6 F lt Room temperature lt 25 C 77 0 F to be set to 21 C 69 8 F c 19 C 66 2 F lt Room temperature lt 21 C 69 8 F to be set to 1 C 1 8 F less than room temperature d Room temperature lt 18 C 64 4 F to be set to 18 C 64 4 F Copyright 2007 LG Electronics Inc All right reserved 21 Only for training and service purposes LGE Internal Use Only 3 Setting the set temperature when heating operation Room temperature lt Set temperature to be set to the previous set temperature Room temperature gt Set temperature a Room temperature lt 20 C 68 0 F to be set to 23 C 73 4 F b 21 C 69 8 F lt Room temperature lt 25 C 77 0 F to be set to 26 C 78 8 F 26 C 78 8 F lt Room temperature lt 28 C to be set to 1 C more than room temperature d 29 C 84 2 F lt Room temperature to be set to 30 C 86 0 F 16 Function for test operation 1 Outline of Operation This is for checking the condition of installation during the installation and it is operated by cooling Fan speed is high comp on and Auto air flow operations without se
14. 71 6 F first setting temperature it up to 22 C 71 6 F and perform energy saving operation Q After energy saving operation starts if adaptation time of the human body pass from the point which room temperature and setting temperature meet together increase setting temperature 1 C 1 8 F more If it doesn t satisfy number even in 50 minutes from the start of energy saving operation increase 1 C 1 8 F amp After increasing setting temperature 1 C 1 8 F more by number perform number again if setting temperature goes up to 25 C 77 0 F maintain this temperature If setting temperature goes down to under 25 C 77 0 F during the operation do number again 27 C 80 6 F 26 C 78 8 F 25 C 77 0 F 24 C 75 2 F 23 C 73 4 F 22 C 71 6 F 21 C 69 8 F 35min 47min A 50min 50min We et Setting energy Setting temp Setting temp Setting temp maintains setting temp saving operation 23 C 73 4 F 24 C 75 2 F 25 77 0 25 C 77 0 F 14 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
15. C 102 2 F Selecting speed gt 28 C 82 4 F gt 34 C 93 2 F Low gt 26 78 8 lt 34 C 93 2 F Off lt 26 C 78 8 F Copyright 2007 LG Electronics Inc All right reserved 18 Only for training and service purposes LGE Internal Use Only 6 Hot Start Control e The indoor fan stops until the evaporator piping temperature will be reached to 28 C 82 4 F During heating operation if piping temperatures fall below 26 C 78 8 F fan stops The operation diagram is as following Maximum INDOOR PIPE 1min TEMP 28 C 82 4 F 26 C 78 8 F INDOOR FAN Selecting SPEED fan speed COMPRESSOR ON 7 Defrost Control e Defrost operation is controlled by timer and sensing temperature of outdoor pipe The first defrost starts only when the outdoor pipe temperature falls below 6 C 21 2 F after 45 minutes passed from starting of heating operation and more than 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 More than 45 minutes of Within More than 45 minutes of heating operation 10 minutes heating operation Outdoor Pipe Temp Sp g op Defrost Defrost 12
16. Copyright 2007 LG Electronics Inc All right reserved 37 Only for training and service purposes POE intemal Use Only 5 The unit does not operate 240V a Tens na lora 1 Check the electric connections 2 Check the fuse of Main PCB ASM Is the AC12 18V at Trans 2nd Replacement Trans Is the connector of kth tor of Main Display correct Seide Main Display Is the DC5V between PIN64 1 Replacement ICO3D and PIN 32 of MICOM 2 Replacement Main PCB ASM Replacement Main PCB ASM 6 Timer control does not operate Replacement Micom Copyright 2007 LG Electronics Inc All right reserved 38 Only for training and service purposes LGE Internal Use Only 7 No heating operation works Is the AC220V AC 240 V between connector CN outunit Pin 1 and Pin 3 of Main PC B NO YES YES ls the input power AC220V AC240V at COMP magnetic coil contactor YES Check the COMP magnetic contactor of outdoor unit Select the heating operation mode Check the wiring connection ON OFF S W ON NO YES Room temp Set temp Setting Is the DC5V NO at 14 pin of Micom terminal Replacement MICOM Replacement MICOM Is the DC5V at 18 pin of Micom terminal Is the DC12V at each terminal Replacement ICO2M RY 4way COIL Is the AC220V AC 240 V between connector 4WAY and CN
17. RANGE BK BLACK WH WHITE BR BROWN YL YELLOW RD RED GN YL GREEN YELLOW T B TERMINAL BLOCK Comp COMPRESSOR FMo MOTOR 3854A20507B 15 Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes 2 LFA80CE LP C483TAO0 INDOOR ELECTRIC CIRCUIT AC PCB ASM BES Nour BR CAPACITOR INDOOR BL TERMINAL MOTOR YL VARISTOR gt GN YL 5 RY HIGH RY MID RY LOW __ OPTIONAL PART poco BYSYNC Noa Y vt tv LINN HOOGLNO OL CN CABLE SYNC CN CN CABLE ROOM TH OR ORANGE YL YELLOW GN YL GREEN YELLOW CN asm UP DOWN Outdoor PIPE SENSOR TEMP SENSOR FUSE 250V 5A VARISTER RY COMP A MAIN PCB ASM CN FAN RELAYB Log BL BLUE OR ORANGE BK BLACK WH WHITE BR BROWN YL YELLOW RD RED GN YL GREEN YELLOW T B TERMINAL BLOCK COMPRESSOR MOTOR 3854A20446C Copyright 2007 LG Electronics Inc All right reserved 16 Only for training and service purposes LGE Interakise Operation Details 1 Time Delay Safety Control The compressor is ce
18. act point with trouble Check it with the eyes or tester Discover the trouble cause and push the rest button 2 Only blowers do not work WHAT TROUBLED COMPLAINTS HOW TO CHECK REMEDY Air volume change over switch Troubled or defective contact point tester Check it with the eyes ora Repair or replace it Capacitor Defected Check it with a tester Replace it Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes 28 LGE Internal Use Only 3 Only outdoor fan does not work WHAT TROUBLED COMPLAINTS HOW TO CHECK REMEDY Motor Over heated Check how itis insulated Repair or replace it Layer short Electric Wiring Open wire on operation Check it with a tester Rewiring or repair Short circuited on operation 4 Only compressor does not work WHAT TROUBLED COMPLAINTS HOW TO CHECK REMEDY Magnetic switch for compressor motor Defective contact magnetic coil troubled Check it with the eyes on with a tester Repair or replace it Compressor motor Troubled over heated layer short Check how it is insulated Replace or repair the compressor Compressor Troubled or over heated lock Groaned noise of motor Repair or replace it High pressure switch Troubled or defective contact or operating Check it with a tester R
19. ased for 3 minutes to balance the pressure in the refrigeration cycle Protection of compressor The indoor fan is ceased for seconds to prevent relay noise Protection of fan relay and micro chip 30sec 4 way valve is ceased for 30 sec to prevent the refrigerant gas abnormal noise when the Heating operation is OFF or switched to the other operation mode 2 Airflow Direction Control This function is to swing the louver left and right automatically and to set it at the desired position The procedure is as the following 151 Press the ON OFF Button to operate the product 2nd Press the Airflow Direction Control Button to swing the louver left and right automatically Remote controller 3rd Repress the Airflow Direction Control Button to set the louver as the desired position Remote controller 3 Cooling Mode Operation When selecting the Cooling 31 Mode Operation the unit will operate according the setting by the controller and the operation diagram is as following Intake Air temp ZN Setting Temp 1 C 1 8 F gt Setting Temp 1 C 1 8 F zu Compressor OFF More than More than Selecting Selecting Selecting Selecting Selecting 4 Off Timer Function This function is to set the time of stopping the unit operation The procedure is as the following 1st Press the timer set button on the Remocon 2nd The buzzer sounds and then the display window show
20. d refrigerant repair leakage if any Thermostat Cut Off Compressor frequently stops and starts Check thermistor operation or any other cause for frequent stop and start operation Discharge and suction pressure are See High Discharge Pressure or High extremely high Suction Pressure High or low voltage or phase unbalance Check the voltage and phase unbalance Overcurrent Relay for Single or three phases running Check the power supply line and the Compressor contact Cut Off Faulty compressor motor Check electric resistance among the compressor terminals and from the terminals to ground Loose connections Check the electric connections Compressor frequently stops and starts Check the operation of the thermistor or any other cause for frequent stop High or low voltage or phase unbalance Check the voltage and electric wiring Overcurrent Relay for Single or three phases running Check the power supply line and the Fan Motor contactor Cut Off Faulty fan motor Check the fan motor and wiring Loose connection Check the elelctric connections Faulty fan bearing Check repair or replace the bearing Loose connections Check the electric connections Fuse Blown Single or three phase running Check the power supply line Faulty motor Check electric resistance among motor housing and from the terminals to ground Disconnection Disconnection 1 Check the wires and connect where Only f
21. e customer the operation and maintenance procedures using the operation manual air filter cleaning temperature control etc If Error Code happens in the display of indoor Error Code Error Contents Checking Point CO Indoor Air Sensor Open or Short 1 Check Sensor Connection to PCB whether it s connected well or not C1 Indoor Pipe Sensor Open or Short 2 Replace it with new Sensor C3 Outdoor Air Sensor Open or Short C4 Outdoor Pipe Sensor Open or Short C5 Communication failure between 1 Check connecting cable wiring order between Indoor and outdoor unit Indoor and outdoor diagram 2 Check all wire connector whether it is connected or not 3 Indoor AC PCB defects short inside 4 Outdoor PCB defects short inside Copyright 2007 LG Electronics Inc All right reserved 26 Only for training and service purposes LGE Interakise Troubleshooting Guide Failures to Start Check of circuit breaker Check power source and fuse Check control switch setting Check control switch Compressor only fails to Fan only fails to start start Electric heater is not energized Improper wiring Drop of power voltage lt Loose terminal connection 4 Defect of fan motor Improper wiring lt capacitor Defect of compressor capacitor Irregular motor resistance Capacitor check Irregular motor insulation Replacement Replacement of fan motor
22. ensure that water is installation or repair of product drained away properly Low refrigerant levels may cause failure of product A bad connection may cause water leakage 5 Copyright 2007 LG Electronics Inc All right reserved LGE Internal Use Only Only for training and service purposes Keep level even when installing the product To avoid vibration or water leakage Operational Use a soft cloth to clean Do not use harsh detergents solvents etc There is risk of fire electric shock or damage to the plastic parts of the product Do not step on or put anyting on the product outdoor units There is risk of personal injury and failure of product Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes Use two or more people to lift and transport the product Avoid personal injury 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 insert hands or other objects through the air inlet or outlet while the product is operated There are sharp and moving parts that could cause personal injury ENS G Doy E LGE Internal Use Only Functions Power Switch ON OFF Operation Mode Control Cooling Heating Soft Dry Fan Indoor Fan Speed Control High Med amp Low Room Temperature control Main
23. eplace it if necessary Electric circuit Copyright 2007 LG Electronics Inc All right reserved Defective connection or disconnection of the circuit for compressor Only for training and service purposes Check it with a tester 29 Rewiring or push reset button LGE Internal Use Only The Units discontinue after the operation started WHAT TROUBLED COMPLAINTS HOW TO CHECK REMEDY Other parts than the unit Improper opening of the Checking Open it properly service valves in the refrigerant line Outdoor coil Coil is dirty 1 Checking Wash it by means of something like chemical washing In condensable gas blended Air intruded into the refrigerant pipe line 1 In 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 Extract air by vacuum pump then recharge the refrigerant High pressure switch Improper adjustment Check it with a pressure gauge Readjust it to normal operating pressure Note Don t alternate the specified adjusting pressure If the adjusted pressure exceeds the specified range it will cause a great accident Refrigerant A shortage of refrigerant amount 2 Recharge the refrigerant Repair the spot where it leaks Outdoor Fan Reverse rotation of fan Obstacle A
24. h No Items 1 Gas side service valve O 15 88mm 5 8inch 2 Liquid side service valve 9 52mm 3 8inch 3 Fan cover 4 Earth screw 5 Connecting cable hole Copyright 2007 LG Electronics Inc All right reserved 12 Only for training and service purposes LGE Internal Use Only Indoor Unit LPNC483TAO LF480CE Air Outlet Vent Remote Signal Receptor Air Intake Vent Air Intake Vent Rear Air Outlet Vent 13 Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes Indoor Unit 486mm 19 1inch 439mm 17 3inch rE amp amp 5 8 3 5 Tile E D A0min 1 6inch m ok X 5 2 5 e 8 8 590mm 23 2inch 141 1 338mm 13 3inch No Items 1 Air Outlet Vent 2 Air Inlet Vent 3 Control display Outdoor Unit 370mm 14 6inch 1 1 9 Z x LG 5 5 3 125mm 4 9inch p p G SAI al zd EN Ne EZ 210mm 290mm LSorhm inch 460 18 tino 130mm 5 tinch 640 25 2 900mm 35 4inch 460mm 18 1inch No Items 1 Air Outlet
25. http biz lgservice com Floor Standing Air Conditioner MODEL LF300CP LP C303R20 LF480CE LP C483TA0 CAUTION Before Servicing the unit read the safety precautions in General SVC manual Only for authorized service personnel Contents Safety Precautions 3 FUNCHONS e A 7 10 11 Wiring Diagrami ooo RAW E E E E 15 lena goi m Hs 17 Installation of Indoor Outdoor nnne 23 Test 25 Troubleshooting Guide 27 Exploded mE 41 Copyright 2007 LG Electronics Inc All right reserved 2n LGE Internal Use Only Only for training and service purposes Safety Precautions To prevent injury to the user or other people and property damage the following instructions must be followed Incorrect operation due to ignoring instruction will cause harm or damage The seriousness is classified by the following indications AWARNING This symbol indicates the possibility of death or serious injury CAUTION This symbol indicates the possibility of injury or damage to properties only p Meanings of symbols used in this manual are as shown below 9 sure not to do 4 Q Be sure to follow the instruction
26. ir short circuit 1 Confirm the wind blowing out Check it with eyes If reversed connect interchanged wires to each terminal Power wirings Note Use an appropriate measuring instrument for readjustment 1 Check the High pressure switch indication 2 Check the Low pressure switch indication Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes 30 LGE Internal Use Only The unit is working but not cooling and heating sufficiently Both blower and compressor are working WHAT TROUBLED COMPLAINTS HOW TO CHECK REMEDY Load Much heat load Heat load increased Do necessary disposal Window or door has many respectively cracks or gaps Air flow Obstacle disturbs Intake Checking Correct it of uniform wind Short air volume Reverse rotation of Checking Correct it blower Refrigerant Shortage in the charged Coil inlet pipe is frosted Replenish it refrigerant Repair the leakage spot Air passage Improper or foreign bodies Checking Correct or clear the foreign bodies Air filter Clogged with dust Checking Cleaning 9 4 All the functions are performed normally but very noisily and much vibratively WHAT TROUBLED COMPLAINTS HOW TO CHECK REMEDY Compressor Liquid refrigerant flooding Check for refrigerant over charge back from the evaporator Check to see if the intaking air
27. it 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 3 Piping length and the elevation Cooling Only Model PIPE SIZE Max Max TUS Length Elevation GAS SIDE LIQUID SIDE B mft 48k 3 4 3 8 40 131 25 82 30k 5 8 3 8 30 98 20 66 Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes 23 400mm 16inch Indoor unit 50mm 2inch 400mm 16inch Indoor unit A Outdoor unit LGE Internal Use Only 2 Indoor Unit installation 3 The mounting floor should be strong and solid enough to prevent it from vibration Drill the piping hole with 2 8 inch diameter hole core drill at either the right or the left of indoor unit The hole should be sightly slant to the outdoor side 200mm 7 9 inch 70mm 2 8 Bi 2 70mm 2 8 inch Core Drill INSIDE OUTSIDE Wall Plastic tube Bushing Z Cut if necessary lt than 15mm 0 6 inch Insert the plastic tube through the hole Cut the extruded outside part of the plastic tube if necessary Copyright 2007 LG Electronics Inc All
28. k unit operation input Discharge the compressor 2 Check the suction pressure Refrigerant low charge or leakage Add refrigerant repair leakage if any Suction pressure is lower than standard See Low Suction Pressure High Intake air extemely hot or excessive air flow 1 Check fresh air intake or check for Suction through the evaporator coil 52528 one Eun al Check air flow quantity Refrigerant over charge Purge the refrigerant Faulty discharge valve or suction valve of Check the operating input the compressor Discharge pressure is higher than standard See High discharge Pressure Low Intake air extremely cold or insufficient air 1 Check air flow quantity Suction flow through the evaporator coil 2 Check air filter Pressure 3 Check evaporator coil frosting Refrigerant short charge or leakage Add refrigerant repair leakage if any Restricted liquid in the suction line Check the capillary tube and the strainer Copyright 2007 LG Electronics Inc All right reserved 32 Only for training and service purposes LGE Internal Use Only Fault Cause Check Correcitve Action Discharge pressure is lower than standard See Low Discharge Pressure Single or three phases running Check the power supply line and the contactor High or low voltage or phase unbalance Check the voltage and phase unbalance Internal Refrigerant short charge or leakage Ad
29. l Use Only Product Specifications MODEL LF300CP LP C303R20 LF480CE LP C483TAO0 POWER SOURCE 0 V Hz 1 208 230 60 1 208 230 60 Only for training and service purposes COOLING CAPACITY BTU h 24 000 44 000 W 8 206 14 067 INPUT 2 600 4 500 CURRENT A 11 5 20 HEATING CAPACITY BTU h INPUT CURRENT A MAKER LG LG TYPE Rotary Rotary COMPRESSOR MODEL QJ250KAB QK145KBD QP325KBD 2 CAPACITY BTU h 17 658 10 100 24000 CURRENT A 7 7 4 5 10 2 INPUT 1 635 935 2162 NOISE INDOOR dB A 45 42 40 56 53 51 LEVEL 1m OUTDOOR 53 68 AIR INDOOR CMM 20 16 5 13 6 706 583 459 212 35 33 30 1 236 1 165 1 059 VOLUME ourpoon CFM 47 1 660 104 3 672 REFRIGERANT 22 kg Oz 1 84 65 3 92 124 2 HEAT INDOOR R C FPI 2R 30C 18FPI 3R 28C 18FPI EXCHANGER OUTDOOR R C FPI 2R 36C 20FPI 2R 26C 21FPI FAN INDOOR xv TURBO FAN TURBO FAN OUTDOOR Propeller Propeller ROOM TEMPERATURE CONTROL Thermistor Thermistor NET INDOOR kg lbs 32 70 5 58 127 9 WEIGHT OUTDOOR 66 145 5 90 198 4 Gross Weight INDOOR kg Ibs 38 83 8 66 145 5 OUTDOOR 71 156 5 100 220 5 DIMENSIONS INDOOR mm 570 x 1 820x 310 22 45 x 71 7 x 12 2 590 x 1 810 x 440 23 23 x 71 26 x 17 32 WXHXD OUTDOOR Inch 870 x 808 x 320 34 3 x 31 8 x 12 6 900 x 1 225 x 370 35 43 x 48 23 x
30. ly P NO 3828A20156T JANUARY 2008
31. or training and service purposes necessary 2 Check the contact holding coil Contact Faulty contact Check the contact in the magnetic contact the over current relay the pressure control switch the operation switch the auxiliary relay Copyright 2007 LG Electronics Inc All right reserved 33 LGE Internal Use Only Electronic Parts Troubleshooting Guide 1 No cooling operation performed Is the AC220V AC 240 V between Connector CN outunit Pin 1 and Pin 3 of Main NO NO Is the unit operating YES ON OFF S W ON YES ls the input power AC220V AC240V at COMP Magnetic coil Check the magnetic contactor of outdoor unit Check the wiring diagram Is it Cooling mode MS YES Select the cooling operation mode Room temp Set temp NO YES Room temp set temp setting Is the DC5V at 14 NO pin of MICOM YES Replacement 02 RY COMP Replacement MICOM 34 Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only 2 1 Indoor fan does not operate Is the unit NO operating Reset the power ON OFF S W YES Is the DC5V at 20pin of MICOM NO Is the DC5V at 21pin of MICOM NO Is the DC5V at 22pin of MICOM NO Replacement YES MICOM and check the EVA Th
32. right reserved 24 Only for training and service purposes Outdoor unit Installation Install the outdoor unit on the concrete or any solid base securely and horizontally by securing it with bolts 012mm 0 5inch and nuts If there is any vibration transmitted to the building mount the rubber underneath the outdoor unit 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 the following table MODEL BTU h REFRIGERANT CHARGE 48k 40g m 1 410z m 30k 30g m 1 060z m Example In case of 15m 49ft long pipe one way the amount of refrigerant to be replenished is 48k 15 7 5 x 40 300g 15 7 5 x 1 41 10 580z LGE Internal Use Only Test running 1 PRECAUTIONS IN TEST RUN The initial power supply must provide at least 90 of the rated voltage Otherwise the air conditioner should not be operated Carry out the test run more than 5 minutes without fail Test run will be cancelled 18 minutes later automatically The test run is started by pressing the down room temperature checking button and ON OFF button for 3 seconds at the same time To cancel the test run press ON OFF button
33. s the Off Time to be setas gt gt 7 The Off Time is shifted as the following by each press gt gt gt If you select 7 the Off Timer function will be cancelled During Off Timer Operation if you repress the timer set button the rest time will be displayed 17 Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes 5 Heating Mode Operation The unit will operate according to the setting by the remote controller and the operation diagram is shown as following Intake Air Temp Compressor OFF dil Setting Tem N Z Compressor BN NI gt Setting Temp 1 C 1 8 F minimum minimum minimum A point The indoor pipe temperature to be less then 35 C 95 0 F amp 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 During heating operation the operating procedure of the indoor fan is as the following Stop VI Low V Selecting Fan Speed IV 39 C 102 2 F Discharge Air Temp 34 C 93 2 F Hot Start Release Point 28 C 82 4 F ui Indoor Pipe Temp 56 C 78 8 F Stop I Selecting Fan Hot Start Operating Indoor fan speed Pipe temp Air discharge temp Off lt 28 C 82 4 F Hot start operating Low gt 28 C 82 4 F lt 39 C 102 2 F Selecting speed gt 28 C 82 4 F gt 39
34. tains 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 Sensing Heat Exchanger Temperature Heat exchanger temperature sensor Thermistor Soft Dry Operation Mode Intermittent operation of fan at low speed Time Delay Safety Control Restarting is inhibited for approx 3 minutes AutoRestart The power comes on again after a power failure Copyright 2007 LG Electronics Inc All right reserved 7 Only for training and service purposes LGE Internal Use Only Remote Control Operation ON OFF Cooling Operation Mode Heating Operation Mode Sot Dry Operation Mode Intermittent operation of fan at low speed Fan Operation Used to circulate room air without cooling Timer Control OFF Timer 1 2 3 7 hour Airflow Direction Control Airflow direction Auto swing and Manual Contol Room Temperature Control Up up to 30 C 86 0 F Down down to 16 C 60 8 F Indoor Fan speed control High Med amp Low 8 Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes Outdoor Unit De ice PCB Outdoor Fan Speed Control One speed Sensing Heat Exchanger Temperature Heat exchanger temperature sensor Thermistor Heating Model Only LGE Interna
35. temperature is extremely cold Check for insufficient air flow quantity Compressor shipping Checking Remove the shipping bracket is not removed bracket Faulty discharge valve and Checking Replace the suction valve compressor Blower Fan broken Checking Repair or replace it TRE Clear the other Other materials intruded material Screws Looseness or fail off of Checking Repair screws 31 Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only WHAT TROUBLED COMPLAINTS HOW TO CHECK REMEDY Electric troubles Defective contact Checking Repair and clean or Magnetic Defective contact point replace it contactor Rusting and faults in the iron core contact face Defective contact of the operating switch Others Improper installation Checking Correct it Trouble checking by protection devices Fault Cause Check Correcitve Action High Discharge Condenser cooling air extremely hot or 1 Check the operation of the outdoor motor insufficient air flow through the condenser 2 Check discharge and suction air circulation Inside of the condenser tube is clogged Clean condenser coil Air in the refrigeration cooling cycle Purge air from the cycle Suction pressure is higher than standard See High Suction Pressure Low Faulty discharge valves or suction valves of 1 Chec
36. tting 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 operation will be cancelled and unit come to rest During the operation if you input remocon key or key on Display panel it performs its duties 3 Function It operates cooling fan speed is high auto air flow operation comp on for 18 1 minutes regardless of room temperature After 18 1 minutes of operation it becomes off itself During the operation signal 48 stands for Lo Copyright 2007 LG Electronics Inc All right reserved 22 Only for training and service purposes LGE Internal Use Only Installation of Indoor Outdoor Unit 1 Selection of the best location 1 Indoor unit There should not be any heat source or steam near the unit There should not be any obstacles to prevent the air circulation A place where air circulation in the room will be good A place where drainage can be easily obtained A place where noise prevention is taken into consideration Do not install the unit near the door way Ensure the spaces indicated by arrows from the wall ceiling fence or other obstacles 2 Outdoor unit f an awning is built over the un
37. y is very high and a door or a window is left open t may cause injury accident or f the base collapses the air Moisture may condense and wet or damage to the product conditioner could fall with it damage furniture causing property damage product failure and personal injury Operational Do not touch operate the Do not place a heater or other not let electric parts of the product with wet hands appliances near the power product get wet cable There is risk of fire or electrical There is risk of fire or electric There is risk of fire failure of the shock shock product or electric shock Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only Do not store or use flammable gas or If strange sounds or small or smoke comes combustibles near the product from product Turn the breaker off or disconnect the power supply cable There is risk of fire or failure of product There is risk of electric shock or fire Do not open the inlet grill of the product during Be cautious that water could not enter the operation Do not touch the electrostatic filter product if the unit is so equipped There is risk of physical injury electric shock or There is risk of fire electric shock or product damage product failure Installation Always check for gas refrigerant leakage after Install the drain hose to
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