LG LC240CP Service Manual Download

Page: 64 / 64

P/No.: 3828A20911A

Printed in Korea

Summary of Contents for LC240CP

Page 1: ...ir Conditioner SERVICE MANUAL LG CAUTION website http www lgservice com e mail http www lgeservice com techsup html BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL ONLY FOR AUTHORIZED SERVICE PERSONNEL ...

Page 2: ... Feature Benefits 8 4 List of Functions 11 5 Function of Remote Control 12 6 Specifications 14 7 Dimensional Drawings 16 8 Wiring Diagrams 20 9 Refrigerant Cycle Diagrams 22 10 Installation 23 11 Trouble Shooting Guide 33 12 3 Way Valve 49 13 Electronic Control Device 53 14 Exploded View and Replacement Parts List 54 ...

Page 3: ...al 3 Nominal Capacity Indoor Units Outdoor Units Power Supply Btu h Type Model Name Model Name Ø V Hz 24K Ceiling Cassette LCN240CP LCU240CP 1Ø 208 230V 60Hz 38K Ceiling Cassette LCN380CP LCU380CP 1 1 Cooling Only Models List ...

Page 4: ...y of injury or damage to properties only Installation Be sure not to do Be sure to follow the instruction Do not use a defective or under rated 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 sh...

Page 5: ...allation stand It 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 condi tioner 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 o...

Page 6: ...hock or product damage Always 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 com bustibles near the product There is risk of fire or failure of product If strange sounds or s...

Page 7: ...tric shock or damage 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 oper ated Th...

Page 8: ...to control 16 x 8 128 units with the help of 8 controllers All units can be put on and off from one Central Room For Setting Temperature Fan Speed and other sub functions access the respec tive LCD wired remote controller of each unit Jet Cool In this mode quick and fast cooling is done Cold and high velocity air is supplied to the room till the indoor temperature reaches 18 C The unit will contin...

Page 9: ...e unit will memorize the above conditions and start with same memorized condition Two Thermistor Control There may be a significant difference between the temperature taken at the installed product and indoor tem perature Two thermistor control provides option to control temperature by referring any of the two tempera tures With the help of the slide switch at the back of the LCD wired remote cont...

Page 10: ...venting damage to the compressor Zero Standby Power Due to SMPS Switching Modulation Power Supply technology there is almost zero power consumption in the standby mode Child Lock Function It prevents the children or others from tampering the control buttons Unit can be controlled by the wireless remote controller This can be easily set by pressing timer key Min key simultaneously After child lock ...

Page 11: ... Saving Gold Fin Environment Friendly Refrigerant o o Fire Alarm Function Forced Operation o o Group Control o o High Ceiling Operation o o Hot Start Jet Cool Low Ambient Control Plasma Air Purifier Optional Optional Prefilter Washable Anti fungus o o Restart Delay 3 minutes o o Self Diagnosis o o Sleep Mode o o Soft Dry Operation o o Swirl Swing o o Tele Control Temperature Control o o Test Funct...

Page 12: ...n airflow direction 7 ON OFF TIMER BUTTONS Used to set the time of starting and stopping opera tion 8 TIME SETTING BUTTONS Used to adjust the time 9 TIMER SET CANCEL BUTTON Used to set the timer when the desired time is obtained and to cancel the Timer operation 10 SLEEP MODE AUTO BUTTON Used to set Sleep Mode Auto operation 11 AIR CIRCULATION BUTTON Used to circulate the room air without cooling ...

Page 13: ...nd select jet cool mode 6 Operation Mode Selection Button Used to select the operation mode Auto Operation Mode Cooling Operation Mode Soft Dry Operation Mode 7 Auto Swing Button Used to swing up and down 8 Room Temperature Checking Button Used to check the room temperature 9 Plasma Air Clean Button Used to start or stop the plasma purification function 10 Timer Cancel Button Used to cancel the ti...

Page 14: ...e Model Name Tube Size OD inch mm Outdoor Coil Fins per inch No of Rows Column Output W Model Outdoor fan motor No of Poles Input W Running Current A Capacitor µF Vac Type Outdoor Fan No Used Diameter EA inch mm Discharge Side Top Speed rpm Air Circulation Outdoor CMM CFM Noise Level Sound Press 1m Outdoor dB A 3 SVC Valve Liquid inch mm Gas Dimensions W H D Outdoor inch mm Net Weight Outdoor kg l...

Page 15: ...2 1 1 4 6 35 5 8 15 88 7 5 35 15 ø25 63 Rotary 2 GJ176K GJ208K LG 18100 PSC FVC68D 500 500 Internal 0 275 7 18 2R 52C 72 6 151 0 63 6 370 Propeller 2 18 1 460 Side Discharge 880 105 3708 58 1 4 6 35 5 8 15 88 35 4 48 2 14 6 900 1225 370 93 205 0 Outdoor Unit LCU380CP Locked Rotor Amp A Type Quantity No Model Maker Compressor Capacity W Btu h Motor Type Motor Input W Oil Type Oil Charge cc O L P Ty...

Page 16: ... 66 66 790 Ceiling opening 790 Ceiling opening 572 Hanging bolt 109 109 30 5 6 4 1 2 3 Number Name Descripition 1 Liquid pipe connection Ø6 35 flare 1 4 2 Gas pipe connection Ø12 7 flare 1 2 3 Drain pipe connection 4 Power supply connection 5 Air discharge grill 6 Air suction grill unit mm Dimensional Drawings 1 Indoor Units Model No LCN240CP Dimensional Drawings ...

Page 17: ...72 Hanging bolt 101 5 101 5 875 Ceiling opening 875 Ceiling opening 785 Hanging bolt 45 45 Unit mm 4 1 2 3 950 950 5 6 Number Name Descripition 1 Liquid pipe connection Ø6 35 flare 1 4 2 Gas pipe connection Ø15 88 flare 5 8 3 Drain pipe connection 4 Power supply connection 5 Air discharge grill 6 Air suction grill unit mm Model No LCN380CP ...

Page 18: ...40 L4 mm 775 L5 mm 25 L6 mm 546 L7 mm 162 L8 mm 162 L9 mm 54 L10 mm 74 5 L11 mm 79 LCU240CP Gas side 3 way valve Liquid side 3 way valve W D L1 L2 L3 L6 L7 L8 L9 L4 H L11 L10 L5 18 Ceiling Cassette Air Conditioner Dimensional Drawings Model No LCU240CP 2 Outdoor Units ...

Page 19: ...380CP Model No Dim W mm 900 H mm 1 225 D mm 370 L1 mm 460 L2 mm 45 L3 mm 410 L4 mm 1 135 L5 mm 90 L6 mm 550 L7 mm 175 L8 mm 175 L9 mm 112 L10 mm 120 L11 mm 83 LCU380CP L6 L7 L8 L9 L4 H L11 L10 L5 W D L1 L2 L3 Gas side 3 way valve Liquid side 3 way valve ...

Page 20: ...20 Ceiling Cassette Air Conditioner Wiring Diagrams 1 Indoor Unit LCN240CP Wiring Diagrams ...

Page 21: ...Service Manual 21 Wiring Diagrams LCU240CP LCU380CP 2 Outdoor Unit ...

Page 22: ...id Side LIQUID SIDE COMPRESSOR ACCUM Gas Side GAS SIDE Capillary Tube Expansion Device OUTDOOR UNIT LC240CP LC380CP Gas Liquid Rated Max Rated Max Pipe Size Diameter Ø inch Piping length ft Elevation ft Model Additional Refrigerant oz ft 1 4 1 4 1 2 5 8 25 100 115 50 50 16 16 Refrigerant Cycle Diagrams 0 32 0 42 ...

Page 23: ...ir conditioner do not disturb neighbors Rooftop Installations If the outdoor unit is installed on a roof structure be sure to level the unit Ensure the roof structure and anchoring method are adequate for the unit location Consult local codes regarding rooftop mounting 1 Select the best location Install the air conditioner in the location that satisfies the following conditions 1 1 Indoor Unit The...

Page 24: ...3 Indoor Unit Installation The following parts is option Hanging Bolt W 3 8 or M10 Nut W 3 8 or M10 Spring Washer M10 Plate Washer M10 Drill the piping hole on the wall slightly tilted to the outdoor side using a Ø 70 hole core drill Set screw of paper model 4 pieces Paper model for installation Ceiling board 150mm Adjust the same height Ceiling board Ceiling Flat washer for M10 accessory Keep the...

Page 25: ... h 38K BTU h 2 1mm2 3 3mm2 Make sure that the screws of the terminal are free from looseness WARNING 1 All wiring must comply with LOCAL REGULATIONS 2 Select a power source that is capable of supplying the current as required by the air conditioner 3 Feed the power source to the unit via a distribution switch board designed for this purpose 4 The terminal screws inside the control box may be loose...

Page 26: ... 6 After tightening these screws install the air inlet grille including the air filter Decoration panel fixing screws hexagon M5 screws Temporally fitting at 2 places Tightening about 10mm Control box cover Piping side Inlet Grille Inlet Grille Inlet Grille Louver motor Decoration panel fixing screws Hexagon M5 screw Air conditioner unit Decoration panel Key holes Display Lead wire for louver moto...

Page 27: ...rant piping gas piping thick piping and drain piping add further 10mm to 30mm thickness material Indoor unit Thermal insulator accessory Fastening band accessory Refrigerant piping HEAT INSULATION 1 Wrap the connecting portion of indoor unit with the Insulation material and secure it with two Plastic Bands for the right pipings If you want to connect an additional drain hose the end of the drain o...

Page 28: ...o the drain port on the indoor unit Heat insulation material Polyethylene foam with thickness more than 8 mm Drain test Maintenance drain port Upward routing not allowed Pipe clamp Indoor unit Flexible drain hose 700 or less 1 1 5m 300mm or less Clamp metal attached Drain hose attached Drain raising pipe Feed water Drain Pump Drain pan Flexible drain hose accessory Main drain pipe Glue the joint D...

Page 29: ...easure 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 CHECK THE FOLLOWING ITEMS WHEN INSTA...

Page 30: ...uit 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 th...

Page 31: ...erature of main body and of remote controller sensor 3 Move the slide switch to set position 4 Close the rear cover and check if it works normally TH R14H SW TH REMO MAIN 2TH OP7 R18H R17H OP6 LO STAND SW HIGH HI R03S C070 R04S R02S R01S OP3 OP2 OP1 R19H R11H R13H R12H OP5R16H OP4 R15H CO1H REMO Room Temp sensor 2TH Indoor Unit Position 1 Position 2 Position 3 Slide switch for ceiling height Slide...

Page 32: ...d mode 3 Group Control Be careful not to exchange the color of wires The maximum length of connecting wire should be below 200m 25Ω on connecting each units Use a wire more than 0 5mm2 CAUTION It operates maximum 16 Units by only one Wired Remote Controller and each Unit starts sequentially to prevent overcurrent Wiring design Operation unit ZONE 1 2 3 4 Humidify JET AUTO AUTO SWING OPERATION FAN ...

Page 33: ...The suction pressure is usually 4 5 6 0 kg cm2 G at normal condition 2 The temperature can be measured by attaching the thermometer to the low pressure tubing and wrap it with putty Temp difference approx 0 C Current less than 80 of rated current Temp difference approx 8 C Current less than 80 of rated current Temp difference less than 8 C Current near the rated current Temp difference over 8 C Te...

Page 34: ...ction between CN POWER of indoor unit and terminal block Check the connecting state of connector Is the Connection of cable between indoor and Outdoor unit right Check the diagram wiring on the control panel Is the voltage of CN POWER in outdoor PCB ASS Y about AC220 240V Check the main power Check the Fuse of outdoor PCB Ass y Check the connecting state of wires Confirm Auto Addresssing work meth...

Page 35: ...eping Mode the wind speed is set to the low speed as force Caused by the remote controller Caused by other parts except the remote controller When the mark is displayed in LCD screen replace battery Check the contact of CN DISP 1 connector When the detect switch double key inside the remote controller door is fault it is impossible to operate temperature regulating and wind speed selecting Check D...

Page 36: ... to be effected by the temperature of Heat Exchanger EVA When the sensor circuit for indoor temperature and connector are in bad connection or are not engaged Compressor Outdoor Fan is stopped Check the indoor temperature sensor is disconnected or not About 10kΩ at 25 C Check Relay RY COMP for driving compressor When the power About AC208V 230V is applied to the connecting wire terminal support tr...

Page 37: ...MOTOR Check the Fan Motor Check the Fuse AC250V T2A Turn ON Main Power Check the related circuit of indoor Fan Motor The pin of Micom and the part for driving SSR Check the pattern Check the SSR SSR Open Indoor Fan Motor never operate SSR short Indoor Fan Motor always operates in case of ON or OFF The voltage of PIN NO 1 blue and 3 yellow of CN FAN or CN MOTOR About AC 160V over About AC 50V over ...

Page 38: ...Check the connecting condition of CN U D Connector Check the soldering condition on PWB of CN U D Connector If there are no problems after above checks Confirm the assembly conditions that are catching and interfering parts in the rotation radial of the Vertical Louver Check the operating circuit of the Vertical Louver Confirm that there is DC 12V between pin RED of CN U D and GND When Vertical Lo...

Page 39: ...ror Error Code Description MPS Variable MPS Inverter LED 1 Red LED 2 Green Indoor Status 21 DC Peak IPM Fault 2 times 1 time ON 22 CT2 Max CT 2 times 2 times OFF 23 DC Link Low Volt 2 times 3 times OFF 24 High Low Pressure Heatsink Switch 2 times 4 times OFF 25 Low Voltage Over Voltage 2 times 5 times OFF 26 DC COMP Position Error 2 times 6 times OFF 27 PSC Fault Error 2 times 7 times OFF 28 DC Li...

Page 40: ...plugged Normal resistor 5KΩ at 25 C Unplugged Normal voltage 2 5Vdc at 25 C plugged Display code Title Cause of error Check point Normal condition Check Point 1 Unplug the sensor on Indoor unit PCB 2 Estimate the resistance of each sensor 3 If the resistance of the sensor is 10KΩ 5KΩ at 25 C then sensor is normal 4 If the resistance of the sensor is 0 KΩ or then sensor is abnormal Change the senso...

Page 41: ...olt DC12V Noise interference Display code Title Cause of error Check point Normal condition Check Point 1 Check the wire connection Open Short Repair the connection 2 Check the soldering state of connector Soldered poorly Repair or Change the PCB 3 Check the volt Of main PCB power source DC 12V DC 5V Repair or Change the main PCB 4 Check the installation of wired remote controller Noise interferen...

Page 42: ...r input 220V Drain tube installation Indoor unit installation Inclination Display code Title Cause of error Check point Normal condition Check Point 1 Check the wire connection Open Soldered poorly Repair the connection or change the PCB 2 Check the resistance of float switch Abnormal Open Normal short Check the float switch 3 Check the level of water 4 Check the volt Of Drain pump power supply AC...

Page 43: ...is abnormal Display code Title Cause of error Check point Normal condition Check Point 1 Check the input power AC230V Outdoor Indoor unit 2 Check the communication wires are correctly connected Adjust the connection of wire Confirm the wire of Live Neutral 3 Check the resistance between communication line and GND Normal Over 2MΩ 4 Check the connector for communication is correctly connected 5 Chec...

Page 44: ...onnection of CN_Press Check the components Check the power source Check the components Display code Title Cause of error Check point Normal condition Check Point CH 24 1 Check the connection of CN_PRESS 2 Check the install condition for over load 3 Check the SVC V V open 4 Check the leakage of refrigerant CH 25 1 Check the power source 2 Check the components Trans1 B Diode Diode Resistance ...

Page 45: ...Cons Check the install condition for over load Check the leakage of refrigerant Check the SVC V V open Display code Title Cause of error Check point Normal condition Check Point CH 32 1 Check the install condition for over load 2 Check the SVC V V open 3 Check the leakage of refrigerant CH 33 1 Check the install condition for over load 2 Check the SVC V V open 3 Check the leakage of refrigerant 4 ...

Page 46: ...r 200KΩ at 25 C Unplugged Normal voltage 4 5Vdc at 25 C plugged Normal resistor 10KΩ at 25 C Unplugged Normal voltage 2 5Vdc at 25 C plugged Normal resistor 5KΩ at 25 C Unplugged Normal voltage 2 5Vdc at 25 C plugged Normal resistor 5KΩ at 25 C Unplugged Normal voltage 2 5Vdc at 25 C plugged Normal resistor 200KΩ at 25 C Unplugged Normal voltage 4 5Vdc at 25 C plugged Normal resistor 10KΩ at 25 C ...

Page 47: ...er Capacity Combination Check sum error Check the indoor unit capacity Check the combination table Check the PCB ASM P No Check the poor soldering Display code Title Cause of error Check point Normal condition Check Point CH 51 1 Check the indoor unit capacity CH 60 1 Check the insertion condition of EEPROM 2 Check the poor soldering ...

Page 48: ...mp 85 C Check the load condition Check the sensor of Condenser pipe sensor Check the fan is locked Check the sensor of heat sink Display code Title Cause of error Check point Normal condition Check Point CH 61 1 Check the install condition for over load Refrigerant Pipe length Blocked CH 62 1 Check the fan is locked 2 Check the Outdoor temp is very high COMP Frequency Hz Toff C T1 C T2 C OFF Norma...

Page 49: ...n Open Open Open Servicing connected manifold gauge Gas charging Open Open Open Servicing with charging cylinder Pressure check Open Open Open Servicing connected manifold gauge Gas releasing Open Open Open Servicing connected manifold gauge 3 2 1 4 5 6 Valve cap Open position Closed position Pin Service port Service port cap To piping connection To outdoor unit Valve cap Open position Closed posi...

Page 50: ... Air purging of the charge hose Open the Low handle valve on the gauge slightly to air purge from the hose 5 Set the liquid side valve to the closed position 6 Operate the air conditioner at the cooling cycle and stop it when the gauge indicates 1kg cm2 g 7 Immediately set the gas side valve to the closed position Do this quickly so that the gauge ends up indicating 1kg g 8 Disconnect the charge s...

Page 51: ...ately one hour Confirm that the gauge needle has moved toward 76 cmHg vacuum of 4 mmHg or less 5 Close the Low handle of the gauge turn off the vacuum pump and confirm that the gauge needle does not move approximately 5 minutes after turning off the vacuum pump 6 Disconnect the charge hose from the vacuum pump Vacuum pump oil If the vacuum pump oil becomes dirty or depleted replenish as needed 7 M...

Page 52: ...oximately 150g each time while operating the air conditioner in the cooling cycle however one time is not sufficient wait approximately 1 minute and then repeat the procedure pumping down pin 4 Immediately disconnect the charge hose from the gas side valve s service port Stopping partway will allow the gas to be discharged If the system has been charged with liquid refrigerant while operating the ...

Page 53: ...Electronic Control Device Service Manual 53 Electronic Control Device Ceiling Cassette Type Main P C B ASM ...

Page 54: ...st 54 Ceiling Cassette Air Conditioner 266090 130411 354211 1 158591 330870 263230 352118 1 266012 552111 55211 2 159830 354211 2 249951 268714 263230 349490 Exploded View and Replacement Parts List Model No LCN240CP LCN340CP 1 Indoor Unit ...

Page 55: ...Exploded View and Replacement Parts List Service Manual 55 346810 130411 359012 W0CZZ 267110 1 267110 2 130911 1 130911 2 ...

Page 56: ...0 2 THERMISTOR ASSEMBLY 6323A3226W R 266012 SWITCH ASSEMBLY FLOAT 6601A20001K R 266090 H V ASSEMBLY 6609A20009L R 267110 REMOTE CONTROLLER ASSEMBLY 6711A20127E R 267110 REMOTE CONTROLLER ASSEMBLY 6711A20083Q R 268714 PWB PCB ASSEMBLY MAIN 6871A10366M R 330870 DRAIN PAN ASSEMBLY 3087A10035H R 346810 MOTOR ASSEMBLY INDOOR 4681A20168D R 349490 ORIFICE ASSEMBLY AGD30251001 R 352118 TUBE ASSEMBLY MENIF...

Page 57: ...ISTOR ASSEMBLY 6323A3226W R 266012 SWITCH ASSEMBLY FLOAT 6601A20001K R 266090 H V ASSEMBLY 6609A20009L R 267110 REMOTE CONTROLLER ASSEMBLY 6711A20127E R 267110 REMOTE CONTROLLER ASSEMBLY 6711A20083Q R 268714 PWB PCB ASSEMBLY MAIN 6871A10366N R 330870 DRAIN PAN ASSEMBLY 3087A10035H R 346810 MOTOR ASSEMBLY INDOOR 4681A20168D R 349490 ORIFICE ASSEMBLY AGD30251001 R 352118 TUBE ASSEMBLY MENIFOLD INDOO...

Page 58: ...w and Replacement Parts List 435301 349480 268712 554031 546810 559010 552112 W0CZZ 552113 268713 552202 566000 649950 554160 561410 552203 1 552203 2 437211 435512 263230 669200 43511 552116 137213 1 435300 137213 2 Model No LCU240CP 2 OUTDOOR UNITS ...

Page 59: ...VICE 5220A20007A R 552203 2 VALVE SERVICE 5220A20006A R 554031 CONDENSER ASSEMBLY BENT 5403A20022T R 554160 COMPRESSOR ASSEMBLY 2520UGK2AA R 559010 FAN ASSEMBLY PROPELLER 1A00195B R 435511 COVER CONTROL 3720AR7035C R 649950 CONTROL BOX ASSEMBLY OUTDOOR 4995A0112M R 268713 PWB PCB ASSY SUB 6871A20318D R 669200 RELAY 6920AP3400A R W0CZZ CAPACITOR DRAWING 6120AR2194F R W0CZZ CAPACITOR DRAWING 3A00988...

Page 60: ... and Replacement Parts List Model No LCN380CP 546810 649950 268712 552203 1 548490 552203 2 435512 559010 561410 W6640 554031 1 554031 2 566001 W0CZZ 1 W0CZZ 2 552116 554160 268713 437212 648600 669200 263230 437910 435511 137212 352115 352111 552201 ...

Page 61: ...SSEMBLY CONDENSER OUT AJR30109601 R 552203 1 VALVE SERVICE 5220A20013A R 552203 2 VALVE SERVICE 5220A20007A R 554031 CONDENSER ASSEMBLY BENT 5403A20044B R 554160 COMPRESSOR ASSEMBLY TBZ30130501 R 559010 FAN ASSEMBLY PROPELLER 1A00195B R 649950 CONTROL BOX ASSEMBLY OUTDOOR ABQ30144401 R 548490 ACCUMLATOR ASSY MECH 5211A00033A R 263230 1 THERMIATOR ASSEMBLY 6323A20019C R 263230 1 THERMISTOR ASSEMBLY...

Page 62: ...62 Ceiling Cassette Air Conditioner Exploded View and Replacement Parts List 152312 135314 146811 137211 268712 135802 Model No PT CDC1 ...

Page 63: ...EMBLY FRONT INDOOR 3721A10106D R 135314 GRILLE ASSEMBLY FRONT INDOOR 3531A10066A R 135312 FILTER ASSY AIR CLEANER 5231A10004A R 146811 MOTOR ASSEMBLY STEP 4681A20055A R 268712 PWB PCB ASSEMBLY DISPLAY 6871A20096J R 135802 DOOR 3580A20005A R PT CDC LOCATION No DESCRIPTION Part No REMARKS ...

Page 64: ...P No 3828A20911A Printed in Korea ...

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