LG AT-C243HLF0 Service Manual Download Page 1

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Ceiling Cassette
Air Conditioner

SERVICE MANUAL

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.

MODEL: LCN240CP/LCU240CP

LC240CPI/LC240CPO
LCN340CP/LCU340CP
LC340CPI/LC340CPO

Summary of Contents for AT-C243HLF0

Page 1: ...N 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 MODEL LCN240CP LCU240CP LC240CPI LC240CPO LCN340CP LCU340CP LC340CPI LC340CPO ...

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 19 9 Refrigerant Cycle Diagrams 21 10 Installation 22 11 Trouble Shooting Guide 32 12 3 Way Valve 48 13 Electronic Control Device 52 14 Exploded View and Replacement Parts List 53 ...

Page 3: ...C240CPI LC340CPI LC240CPO LC340CPO 1 2 Outdoor units Chassis 1Ø 208 230V 60Hz Power supply 34 24 kBtu h 9 96 7 03 kW Total capacity index of connectable indoor units 1 No of connectable indoor units AT C243HLF0 AT C343HLF0 Cooling only 1 Model line up 1 1 Indoor units 7 03 24 9 96 34 TH Category Type Model names Capacity kW kBtu h Chassis 4 way Ceiling cassette AT C243HLF0 AT C343HLF0 ...

Page 4: ...ge 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 shock Always install ...

Page 5: ...ay 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 or damage furniture ...

Page 6: ...age 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 small or smoke comes...

Page 7: ...e 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 There are sharp and m...

Page 8: ...ntrol 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 64 F The unit will contin...

Page 9: ...ill 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 controller s...

Page 10: ...amage 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 is set pr...

Page 11: ...red remote controller Deluxe wired remote controller Individual Control Simple wired remote controller Wired remote controller for hotel use Wireless remote controller simple Wireless LCD remote controller General central control Non LGAP CAC Network Dry contact Function Simple central control LGAP PDI Power Distribution Indicator PI 485 Special Function Kit CTIE Zone control Others Thermistor 4 4...

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: ... to set the desired fan speed and 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 Canc...

Page 14: ...vel H M L dB A 3 Piping Connections Liquid mm inch Gas mm inch Drain OD ID mm inch Dehumidification rate l h pts h Safety Devices Temperature sensor Refrigerant Refrigerant control Connectable outdoor Unit Power and Transmission interunit cable No mm2 No AWG Model AT C243HLF0 LCN240CP LC240CPI AT C343HLF0 LCN340CP LC340CPI Indoor unit type Ceilling Cassette 4way 1 208 230 60 1 208 230 60 7 03 9 96...

Page 15: ...as mm inch Max piping length Main piping m ft Max elevation Indoor unit Outdoor unit m ft 7 03 9 96 24 000 34 000 2 5 3 6 11 5 17 24 38 1 208 230 60 2 208 230 60 3 2 1 14 3 3 3 12 4 2 1 14 4 2 1 14 870 800 320 341 2 311 2 1219 32 900 1160 370 357 16 4511 16 149 16 73 160 86 190 78 172 93 205 1 1 ROTARY ROTARY 2 GK120KAA GJ151KAA GJ208KAA Induction Induction 700 1200 PVE PVE 2100 74 1 2500 88 2 R41...

Page 16: ...ng opening 688 27 1 hanging bolt 840 33 1 900 35 4 ceiling opening 950 37 4 806 31 7 hanging bolt 840 33 1 Drain pipe connection Air suction grille Part Name Decoration panel Air discharge grille Liquid pipe connection Gas pipe connection 6 5 No 2 4 3 1 Remark 7 Power supply connection mm inch Dimensional Drawings 1 Indoor Units Model No LCN240CP LC240CPI LCN340CP LC340CPI Dimensional Drawings ...

Page 17: ...870 34 3 546 21 5 54 6 2 1 333 13 1 Ø531 20 9 10 0 4 808 31 8 782 5 30 8 392 15 4 25 5 1 0 80 3 1 50 2 0 320 12 6 320 12 6 340 13 4 360 14 2 160 6 3 mm inch Dimensional Drawings Model No LCU240CP LC240CPO 2 Outdoor Units ...

Page 18: ... pipe connection Part Name Air discharge grille Liquid pipe connection Earth screw Power transmission connection 5 No 2 4 3 1 Remark 5 1135 44 7 1165 45 9 308 12 1 565 22 2 273 10 7 520 20 5 80 3 1 124 4 9 900 35 4 550 21 7 370 14 6 395 15 6 15 0 6 175 6 9 3 2 65 2 6 4 370 14 6 1 mm inch ...

Page 19: ...tion CN POWER AC power supply CN MOTOR BLDC fan motor output CN DPUMP Drain pump output CN DISP Display CN FLOAT Float switch input CN REMO Remote control CN CC Dry contact CN ROOM Room sensor CN PIPE1 In pipe thermistor CN PIPE2 Out pipe thermistor CN GRILL Elevation grille CN PTC PTC Heater CN HVB HVB Ass y Air cleaner ...

Page 20: ...s LCU240CP LC240CPO LCU340CP LC340CPO 2 Outdoor Unit Notes BL RD YL BLUE RED YELLOW BK OR GN YL BLACK ORANGE GREEN YELLOW BR WH BROWN WHITE FIELD WIRING Notes BL RD YL BLUE RED YELLOW BK OR GN YL BLACK ORANGE GREEN YELLOW BR WH BROWN WHITE FIELD WIRING ...

Page 21: ... E V Accumulator Heat Exchanger Check Valve Constant Compressor 1 Constant Compressor 2 Check Valve Thermistor Thermistor High pressure S W Thermistor 24k 34k Gas Liquid Rated Max Rated Max Pipe Size Diameter Ø inch Piping length ft Elevation ft Capacity Additional Refrigerant oz ft 1 4 1 4 1 2 5 8 25 100 115 50 66 16 16 Refrigerant Cycle Diagrams 0 22 0 32 ...

Page 22: ...arm air and noise from the air 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 co...

Page 23: ...nit 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 2 76inch hole core drill Set screw of paper model 4 pieces Paper model for installation Ceiling board 150mm 5 91inch Adjust the same height Ceiling board Ceiling Flat washer for M10 accessory ...

Page 24: ...th a grounding wire and connector to meet the LOCAL REGULATION Cooling Heating type The power cord connected to the outdoor unit should be complied with the following specifications Rubber insulation type H05RN F approved by HAR or SAA If the supply cord is damaged it must be replaced by a special cord or assembly available from the manufacturer of its service agent The connecting cable connected ...

Page 25: ...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 0 39inch 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 26: ... for refrigerant piping gas piping thick piping and drain piping add further 10mm to 30mm 0 39inch to 1 18 inch 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...

Page 27: ...Heat insulation material Polyethylene foam with thickness more than 8 mm 0 31inch Drain test Maintenance drain port Upward routing not allowed Pipe clamp Indoor unit Flexible drain hose 700mm 27 6inch or less 1 1 5m 3 32 4 92ft 300mm 11 81inch 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 j...

Page 28: ...cord 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 INSTALLATION IS CO...

Page 29: ...reaker 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 el...

Page 30: ...olled by the thermistor of the main body Position 3 The room temperature is controlled by lower temperature between the temperature 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 Slide switch for 2 Thermistor 1 2 3 1 2 3 1 2 3 Select the position after counselling with a customer In case of cooling mode roo...

Page 31: ...onnecting wire should be below 200m 656ft 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 SPEED Program set SUB FUNCTION SET TEMP Room Temp HI MED LO Heater Defrost Filter Preh...

Page 32: ...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 0 F Current less than 80 of rated current Temp difference approx 8 C 14 4 F Current less than 80 of rated current Temp difference less than 8 C 14 4 F Current near the rated cur rent Temp differe...

Page 33: ...ween 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 method Check ...

Page 34: ...n the Sleeping 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 selectin...

Page 35: ...cted 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 77 F Check Relay RY COMP for driving compressor When the power About AC208V 230V is applied to the connecting wire terminal support transfer...

Page 36: ...AN or CN 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 ...

Page 37: ... 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 Louver does...

Page 38: ...utdoor Error 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...

Page 39: ...ormal resistor 5KΩ at 25 C 77 F Unplugged Normal voltage 2 5Vdc at 25 C 77 F 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 77 F then sensor is normal 4 If the resistance of the sensor is 0 KΩ or then sensor is abnormal Change the...

Page 40: ...ain PCB Volt 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 i...

Page 41: ...20V 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 230V Rep...

Page 42: ...door PCB 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 connect...

Page 43: ... 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 44: ...ns 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 Ch...

Page 45: ...oltage 4 5Vdc at 25 C 77 F plugged Normal resistor 10KΩ at 25 C 77 F Unplugged Normal voltage 2 5Vdc at 25 C 77 F plugged Normal resistor 5KΩ at 25 C 77 F Unplugged Normal voltage 2 5Vdc at 25 C 77 F plugged Normal resistor 5KΩ at 25 C 77 F Unplugged Normal voltage 2 5Vdc at 25 C 77 F plugged Normal resistor 200KΩ at 25 C 77 F Unplugged Normal voltage 4 5Vdc at 25 C 77 F plugged Normal resistor 10...

Page 46: ...tion Undder 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 47: ...85 F 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 Normal N...

Page 48: ...Evacuation 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 Cl...

Page 49: ...he 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 indi cating 1kg g 8 Disconnect the charge set and mount the...

Page 50: ...pproximately 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 nee dle 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 deplet ed replenish as n...

Page 51: ...g 5 3oz each time while operating the air conditioner in the cooling cycle however one time is not suffi cient 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 dis charged If the system has been charged with liquid refrigerant while operating the air c...

Page 52: ...52 Ceiling Cassette Air Conditioner Electronic Control Device Electronic Control Device Main P C B ASM Indoor Outdoor ...

Page 53: ...810 359012 130911 3 130911 4 130911 2 130911 1 152510 330870 159830 354211 W49800 352118 158591 552111 263230 1 249951 135500 1 337000 349480 263230 2 267110 1 267110 2 268714 266090 349600 Exploded View and Replacement Parts List Model No LCN240CP LCN340CP 1 Indoor Unit ...

Page 54: ...R 263230 1 THERMISTOR NTC 6323A30002A R 263230 2 THERMISTOR NTC 6323AQ3226W R 266090 HVPS DC DC 6609A20009L R 267110 1 REMOTE CONTROLLER ASSEMBLY 6711A20127E R 267110 2 REMOTE CONTROLLER ASSEMBLY 6711A20083Q R 268714 PCB ASSEMBLY MAIN 6871A10366M 6871A10366N R 330870 PAN ASSEMBLY DRAIN 3087A10035H R 337000 MESH METAL 3700A20036A R 346810 MOTOR ASSEMBLY DC INDOOR 4681A20168D R 349480 ORIFICE 4948A2...

Page 55: ...rts List 435301 349480 554031 546810 559010 649950 552203 1 552203 2 437210 430410 550140 435512 447910 349600 552112 552117 552114 554160 567480 2 435511 137213 1 435300 137213 2 552113 268711 567480 1 W0CZZ 1 W0CZZ 2 Model No LCU240CP 2 OUTDOOR UNITS ...

Page 56: ...C R W49810 SUPPORTER ASSEMBLY 4980A20001B 550140 DAMPER COMPRESSOR 4H00982E R 552112 TUBE ASSEMBLY CONDENSER IN 5211A25715A R 552113 TUBE ASSEMBLY CONDENSER OUT 5211A25716A R 552114 TUBE ASSEMBLY DISCHARGE OUTDOOR 5211A29916A R 552117 TUBE ASSEMBLY SUCTION OUTDOOR 5211A29913A R 552203 1 VALVE SERVICE 5220A20007A R 552203 2 VALVE SERVICE 5220A20006A R 554031 CONDENSER ASSEMBLY BENDING 5403A20022T R...

Page 57: ...rts List Model No LCU340CP LC340CP0 546810 649950 552203 1 552203 2 435512 559010 554031 554031 W0CZZ 1 W0CZZ 2 268714 135314 669200 263230 2 263230 1 549610 437211 135301 435511 137212 447910 430411 W49800 552114 554160 2 548490 552112 55211G 554160 1 ...

Page 58: ...MOTOR 4960A10004A R 552112 TUBE ASSEMBLY MENIFOLD OUTDOOR 5211A00034A R 552113 TUBE ASSEMBLY CONDENSER OUT AJR30109601 R 552114 TUBE ASSEMBLY DISCHARGE OUTDOOR 5211A19011A R 55211G TUBE ASSEMBLY EXPANSION AJR30127901 R 552203 1 VALVE SERVICE 5220A20013A R 552203 2 VALVE SERVICE 5220A20007A R 554031 CONDENSER ASSEMBLY BENDING 5403A20044B R 554160 1 COMPRESSOR SET KOREA TBZ30130501 GJ208KAA R 554160...

Page 59: ...Service Manual 59 Exploded View and Replacement Parts List 152312 135314 146811 137211 268712 135802 Model No PT CDC1 ...

Page 60: ...PANEL ASSEMBLY FRONT INDOOR 3721A10106M 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 CDC1 LOCATION No DESCRIPTION Part No REMARKS ...

Page 61: ...P No 3828A20911A Printed in Korea ...

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