hit counter script
LG LCN240CP Service Manual
  1. Manuals
  2. Brands
  3. LG Manuals
  4. Air Conditioner
  5. LCN240CP
  6. Service manual

LG LCN240CP Service Manual

Lg ceiling cassette air conditioner service manual
Hide thumbs Also See for LCN240CP:
Table of Contents

Advertisement

Quick Links

See also: Owner's Manual
LG
Ceiling Cassette
Air Conditioner

SERVICE MANUAL

MODEL: LCN240CP/LCU240CP
LC240CPI/LC240CPO
LCN340CP/LCU340CP
LC340CPI/LC340CPO
website http://www.lgservice.com
e-mail http://www.lgeservice.com/techsup.html
CAUTION
• BEFORE SERVICING THE UNIT, READ THE SAFETY
PRECAUTIONS IN THIS MANUAL.
• ONLY FOR AUTHORIZED SERVICE PERSONNEL.
LG

Advertisement

Table of Contents
loading

Related Manuals for LG LCN240CP

Summary of Contents for LG LCN240CP

  • Page 1: Service Manual

    Ceiling Cassette Air Conditioner SERVICE MANUAL MODEL: LCN240CP/LCU240CP LC240CPI/LC240CPO LCN340CP/LCU340CP LC340CPI/LC340CPO website http://www.lgservice.com e-mail http://www.lgeservice.com/techsup.html CAUTION • BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. • ONLY FOR AUTHORIZED SERVICE PERSONNEL.

  • Page 2: Table Of Contents

    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 2 Ceiling Cassette Air Conditioner...

  • Page 3: Models List

    ❈ Local model name Factory AT-C243HLF0 AT-C343HLF0 Model names Capacity, kW(kBtu/h) 7.03(24) AT-C243HLF0 AT-C243HLF0 7.03 kBtu/h 1Ø, 208-230V, 60Hz Local Model 1 Indoor Outdoor LCN240CP LCU240CP LCN340CP LCU340CP 9.96(34) AT-C343HLF0 AT-C343HLF0 9.96 Local Model 2 Indoor Outdoor LC240CPI LC240CPO LC340CPI LC340CPO...

  • Page 4: Safety Precautions

    Always install a dedicated cir- cuit and breaker. • Improper wiring or installation may cause fire or electric shock 4 Ceiling Cassette Air Conditioner Be sure not to do. Be sure to follow the instruction. Always ground the product. • There is risk of fire or electric shock.
  • Page 5 Authorized Service Center. • There is risk of fire, electric shock, explosion, or 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.
  • Page 6 Always check for gas (refrigerant) leakage after installation or repair of product. • Low refrigerant levels may cause failure of product. 6 Ceiling Cassette Air Conditioner If strange sounds, or small or smoke comes from product. Turn the breaker off or discon- nect the power supply cable.
  • Page 7 Keep level even when installing the product. • To avoid vibration or water leakage. 90˚ I 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.

  • Page 8: Feature & Benefits

    Features & Benefits Environment Friendly Refrigerant : - LG Ceiling Cassette Air Conditioners uses environ- ment friendly refrigerant, which don't do any harm to the environment. Plasma Air Purifier : - It removes not only microscopic contaminants & dust, but also house mites, pollen, and pet fur to help preventing allergic diseases like asthma.It provides...

  • Page 9: Auto Restart Operation

    Swirl Swing - It is the function for comfort cooling/heating operation. - The diagonal two louvers are opened the more larger than the other louvers. After one minute, it is opposite. Space Control Vanes angle can be controlled by pair, considering its installation environment.

  • Page 10: Self Diagnosis Function

    LCD wired remote controller & diagnosis can be done as per the code indication. The same is also printed on key cover of the LCD wired remote controller. 10 Ceiling Cassette Air Conditioner 700/600/500 750/650/550 800/700/600 5~6W 0.5W...

  • Page 11: List Of Functions

    List of Functions • Ceiling Cassette Category Function Air supply outlet Airflow direction control (left & right) Airflow direction control (up & down) Auto swing (left & right) Auto swing (up & down) Air flow Airflow steps(Fan / Cool / Heat) CHAOS swing CHAOS wind (Auto wind) Jet cool (Power wind)

  • Page 12: Function Of Remote Control

    °C/°F Operation Mode Cooling Operation Auto Operation Healthy Dehumidification Operation 12 Ceiling Cassette Air Conditioner 1. START/STOP BUTTON Operation starts when this button is pressed and stops when the button is pressed again. 2. OPERATION MODE SELECTION BUTTON Used to select the operation mode.
  • Page 13 2. Wired LCD Remote Control Operation display Displays the operation conditions. On/Off Button Operation starts when this button is pressed, and stops when the button is pressed again. Set Temperature Button Used to set the temperature when the desired tem- perature is obtained.

  • Page 14: Specifications

    - Outdoor Temperature 35°C(95°F) DB /23.9°C(75°F) WB Piping Length - Interconnecting Piping Length 7.5m(25ft) - Level Difference of Zero. 14 Ceiling Cassette Air Conditioner Ceilling Cassette - 4way AT-C243HLF0 (LCN240CP / LC240CPI) Phase/Volts/Hz 1 / 208-230 / 60 7.03 Btu/h 24,000...
  • Page 15 Outdoor Unit Rated Capacity Cooling Heating Rated Input Cooling Heating Energy Label Testing combination Running current Cooling Heating Starting current (Cooling/Heating) Power supply Power supply Cable(outdoor) No. * mm Power and transmission cable No. * mm Dimensions W * H * D Net weight Gross weight Maximum number of connectable unit...

  • Page 16: Dimensional Drawings

    Dimensional Drawings 1. Indoor Units Model No.: LCN240CP/LC240CPI/LCN340CP/LC340CPI 950(37.4) Decoration panel Air suction grille Air discharge grille Gas pipe connection Liquid pipe connection Drain pipe connection Power supply connection 16 Ceiling Cassette Air Conditioner 225(8.9) 950(37.4) 950(37.4) Part Name Remark 900(35.4) (ceiling opening)

  • Page 17: Outdoor Units

    Dimensional Drawings 2. Outdoor Units Model No.: LCU240CP/LC240CPO 870(34.3) 546(21.5) 160(6.3) 54.6(2.1) 333(13.1) 320(12.6) *mm(inch) Service Manual 17...
  • Page 18 Model No.: LCU340CP/LC340CPO 900(35.4) 308(12.1) Air discharge grille Gas pipe connection Liquid pipe connection Power & transmission connection Earth screw 18 Ceiling Cassette Air Conditioner 550(21.7) 175(6.9) Part Name 370(14.6) 65(2.6) *mm(inch) Remark...

  • Page 19: Wiring Diagrams

    Wiring Diagrams 1. Indoor Unit LCN240CP/LC240CPI/LCN340CP/LC340CPI Connector Number CN-POWER CN-MOTOR CN-DPUMP CN-DISP CN-FLOAT CN-REMO CN-CC CN-ROOM CN-PIPE1 CN-PIPE2 CN-GRILL CN-PTC CN-HVB Location AC power supply BLDC fan motor output Drain pump output Display Float switch input Remote control Dry-contact Room sensor...

  • Page 20: Outdoor Unit

    2. Outdoor Unit LCU240CP/LC240CPO Notes: BLUE YELLOW LCU340CP/LC340CPO Notes: BLUE YELLOW 20 Ceiling Cassette Air Conditioner BLACK ORANGE GN/YL GREEN/YELLOW BLACK ORANGE GN/YL GREEN/YELLOW BROWN WHITE FIELD WIRING BROWN WHITE FIELD WIRING...

  • Page 21: Refrigerant Cycle Diagrams

    Refrigerant Cycle Diagrams 1. Cooling Only Models INDOOR UNIT H/EX Capillary Tube Pipe Size(Diameter:Ø) inch Capacity OUTDOOR UNIT Thermistor Gas Side Accumulator GAS SIDE E.E.V. LIQUID SIDE Piping length (ft.) Liquid Rated Max. High pressure Thermistor Check Check Valve Valve Thermistor (Air) Heat...

  • Page 22: Installation

    • Take the air conditioner weight into account and select a place where noise and vibration are minimum. • Select a place so that the warm 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.

  • Page 23: Indoor Unit Installation

    • Drill the piping hole on the wall slightly tilted to the outdoor side using a Ø 70(2.76inch) hole-core drill. Tubing connection Ceiling Air Conditioner body Ceiling board Set screw of paper model (4 pieces) Open the ceiling board along the outer edge of the...

  • Page 24: Wiring Connection

    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.

  • Page 25: Installation Of Decoration Panel

    4. Retighten completely two temporarily fixed screws and other two screws. (Total 4 screws) 5. Connect the louver motor connector and display connector. 6. After tightening these screws, install the air inlet grille (including the air filter). Air conditioner unit Decoration panel fixing screws (hexagon M5 screws) Temporally fitting at 2 places (Tightening about 10mm(0.39inch))

  • Page 26: Heat Insulation

    1. Use the heat insulation material for the refrigerant piping which has an excellent heat-resistance (over 120°C(248°F) ). 2. Precautions in high humidity circumstance: This air conditioner has been tested according to the "KS Standard Conditions with Mist" and con here is not any default. However, if it is operated for a long time in high humid atmosphere (dew point temperature: more than 23°C(73.4°F)), water drops...

  • Page 27: Drain Pipe Work

    I Install the drain raising pipes at a right angle to the indoor unit and no more than 300mm(11.81inch) from the unit. Drain test The air conditioner uses a drain pump to drain water. Use the following procedure to test the drain pump operation: Feed water...

  • Page 28: 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. CAUTION For test run, carry out the cooling operation first even during winter season.

  • Page 29: Hand Over

    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.

  • Page 30: Optional Operation

    • In case of cooling mode, room temperature is controlled by the main body sensor. • To control the room temperature by a wired remote controller, install controller(room temp. sensor) to sense the temperature more accurately. • Maunfactured in the position 3. 30 Ceiling Cassette Air Conditioner...
  • Page 31 2) Adjusting air volume to the height of ceiling You can choose the RPM(or air volume) of indoor motor according to the height of ceiling to supply the com- fortable atmosphere to consumers. Procedure 1. Choose the selectable position in the table after measuring the height of ceiling. Ceiling height Mode of slide switch more than 3.3m(10.8ft)

  • Page 32: Troubleshooting Guide

    1. The suction pressure is usually 4.5~6.0 kg/cm 2. The temperature can be measured by attaching the thermometer to the low pressure tubing and wrap it with putty. 32 Ceiling Cassette Air Conditioner : approx. 0°C(0°F) All amount of refrigerant leaked out.

  • Page 33: Electronic Parts Troubleshooting Guide

    Troubleshooting Guide Electronic Parts Troubleshooting Guide The Product doesn’t operate at all. Trouble 1 Turn off the main power and wait until LED on outdoor PCB is off Turn on the main power again. Does the Operating LED of indoor unit blink Refer to the self-diagnosis function.
  • Page 34 -Voltage between CN1 ➀ - ➆ : DC +5V operate temperature regulating(L / M) and wind speed selecting. Check the Display PWB Ass'y • Check receiver ass'y 34 Ceiling Cassette Air Conditioner...
  • Page 35 When cooling does not operate Trouble 3 Operate "Cooling Mode( remote controller is less than one of the indoor temperature by 1°C at least. When in Air Circulation Mode, Compressor/Outdoor Fan is stopped. Check the sensor for indoor temperature is attached as close as to be effected by the temperature of Heat Exchanger(EVA).

  • Page 36: When Indoor Fan Does Not Operate

    The voltage of PIN NO 1(blue) and 3(yellow) of CN-FAN or CN-MOTOR. About AC 160V over SSR is not damaged 36 Ceiling Cassette Air Conditioner Turn off Main power Check the connection of CN-FAN or CN-MOTOR Check the Fan Motor Check the Fuse(AC250V/T2A) Check the related circuit of indoor Fan Motor.

  • Page 37: When Vertical Louver Does Not Operate

    When Vertical Louver does not operate Trouble 5 • Confirm that the Vertical Louver is normally geared with the shaft of Stepping Motor. • If the regular torque is detected when rotating the Vertical Louver with hands Normal • Check the connecting condition of CN-U/D Connector •...
  • Page 38 Const. D-Pipe Thermistor Error(Open/Short) Capcity Error(High/Low) Signal Error(Indoor_Outdoor) Phase Error EEPROM Check Sum Error Cond Pipe High Heatsink High Cond Pipe Low Heatsink Thermistor Error(Open/Short) 38 Ceiling Cassette Air Conditioner LED 1 Variable Inverter (Red) LED 1 Variable Inverter (Red)
  • Page 39 Troubleshooting CH01, CH02, CH06 Display Title code Indoor air sensor Indoor inlet pipe sensor Indoor outlet pipe sensor Check the resistance 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.
  • Page 40 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 interference) ¡ Adjust the state of installation 40 Ceiling Cassette Air Conditioner Cause of error •...
  • Page 41 Troubleshooting CH04 Display Title code Drain pump / Float switch 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.
  • Page 42 6. If one indoor unit is operated normally, outdoor PCB is no problem. ¡ Check the another indoor unit. * CH05 is displayed at indoor unit, CH53 is displayed at outdoor unit. 42 Ceiling Cassette Air Conditioner Cause of error • Power input AC 220V. (Outdoor, Indoor) •...
  • Page 43 Troubleshooting CH24, CH25 Display Title code Press S/W Open Input voltage 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. Cause of error •...
  • Page 44 1. Check the install condition for over load. 2. Check the SVC V/V open. 3. Check the leakage of refrigerant. 44 Ceiling Cassette Air Conditioner Cause of error • Check the discharge pipe sensor for INV. • Check the install condition for over load.
  • Page 45 Troubleshooting CH41, CH44, CH45, CH46, CH47, CH65 Display Title code D-pipe sensor (Inverter) Air sensor Condenser Pipe sensor Suction Pipe sensor D-pipe sensor (Constant) Heat sink sensor Check Point 1. Estimate the resistance of each sensor.(Unplugged) 2. Estimate the voltage of each sensor.(Plugged) 3.
  • Page 46 Capacity Error EEPROM Check sum Check Point • CH 51 1. Check the indoor unit capacity. 46 Ceiling Cassette Air Conditioner Cause of error • Over Capacity • Check the indoor unit capacity. Combination • Undder Capacity • Check the combination table.
  • Page 47 Troubleshooting CH61, CH62 Display Title code Condenser pipe sensor temp. high Heat sink sensor temp. high Toff °C T2 °C T1 °C COMP Frequency Normal (Hz) Check Point • CH 61 1. Check the install condition for over load. (Refrigerant, Pipe length, Blocked, …) Cause of error •...

  • Page 48: 3-Way)Valve

    (with valve cap) Pumping down (Transfering) Evacuation (Servicing) Gas charging (Servicing) Pressure check (Servicing) Gas releasing (Servicing) 48 Ceiling Cassette Air Conditioner 3-way Valve (Liguid Side) Valve cap Open position Closed position To piping Service Service port cap port To outdoor unit...

  • Page 49: Pumping Down

    Closed 3-Way valve CLOSE 6. Operate the air conditioner at the cooling cycle and stop it when the gauge indicates 1kg/cm 7. Immediately set the gas side valve to the closed position. - Do this quickly so that the gauge ends up indi- cating 1kg/ 8.

  • Page 50: Vacuum Pump

    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). 50 Ceiling Cassette Air Conditioner Liquid side Gas side OPEN CLOSE 6.

  • Page 51: Gas Charging

    (approximately 150g(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).

  • Page 52: Electronic Control Device

    Electronic Control Device Electronic Control Device • Main P.C.B ASM <Indoor> <Outdoor> 52 Ceiling Cassette Air Conditioner...

  • Page 53: Exploded View And Replacement Parts List

    Exploded View and Replacement Parts List 1. Indoor Unit Model No.: LCN240CP/LCN340CP 267110-2 349480 249951 135500-1 337000 354211 352118 158591 263230-1 263230-2 267110-1 268714 130911-2 W49800 552111 130411 349600 346810 359012 130911-3 130911-4 152510 130911-1 330870 159830 266090 Service Manual 53...

  • Page 54: Parts List

    BRACKET,MOTOR 352118 TUBE ASSEMBLY,MENIFOLD(INDOOR) 354211 EVAPORATOR ASSEMBLY,FINAL 359012 FAN,TURBO 552111 TUBE ASSEMBLY,CAPILLARY W49800 SUPPORTER ASSEMBLY 54 Ceiling Cassette Air Conditioner Part No. LCN240CP / LC240CPI LCN340CP / LC340CPI 3041A10069A 3091A10075E 3091A10085C 3091A10077A 3091A10075F 3550A30273A 5251A10003A 5859A10006G 5983A10003D 4995A10224E 4995A10224F 6323A30002A...
  • Page 55 Exploded View and Replacement Parts List 2. OUTDOOR UNITS Model No.: LCU240CP Service Manual 55...
  • Page 56 OVERLOAD PROTECT 649950 CASE ASSEMBLY,CONTROL(OUTDOOR) W6920 RELAY,CONTACT W0CZZ-1 Capacitor,AL,Radial W0CZZ-2 CAPACITOR,FILM,BOX W4810 BRACKET W4986 GASKET 268711 PCB ASSEMBLY, MAIN 56 Ceiling Cassette Air Conditioner Part No. LCU240CP / LC240CPO 1A00202F 3A02284N 6323A20028B 6323A20023E 4948AP2527A 1A00206B 3041AP2741G 1A00208H 3530A20007J 3550AR2886C 3720AR7035C...
  • Page 57 Exploded View and Replacement Parts List Model No.: LCU340CP/LC340CP0 Service Manual 57...
  • Page 58 559010 FAN ASSEMBLY,PROPELLER 561411 SOLENOID 649950 CASE ASSEMBLY,CONTROL(OUTDOOR) 669200 RELAY,CONTACT W0CZZ-1 CAPACITOR,FILM,BOX W0CZZ-2 CAPACITOR,FILM,BOX W49800 SUPPORTER 268714 PCB ASSEMBLY,MAIN 58 Ceiling Cassette Air Conditioner Part No. LCU340CP / LC340CPO 3530AP1225D 3720AP1202L 3721A20229A 6323A20019C 6323A20023E 3041A20047Z 3A01293X 3550AP1213B 3720AP1212B 4760AP1216C 4681A10030C...
  • Page 59 Exploded View and Replacement Parts List Model No.: PT-CDC1 146811 268712 152312 135314 135802 137211 Service Manual 59...
  • Page 60 Parts List LOCATION DESCRIPTION 137211 PANEL ASSEMBLY,FRONT(INDOOR) 135314 GRILLE ASSEMBLY,FRONT(INDOOR) 135312 FILTER ASSY,AIR CLEANER 146811 MOTOR ASSEMBLY,STEP 268712 PWB(PCB) ASSEMBLY,DISPLAY 135802 DOOR 60 Ceiling Cassette Air Conditioner Part No. REMARKS PT-CDC1 3721A10106M 3531A10066A 5231A10004A 4681A20055A 6871A20096J 3580A20005A...
  • Page 61 P/No.: 3828A20911A Printed in Korea...

This manual is also suitable for:

Lc240cpLc340cpLcn340cpLcu240cpLc240cpiLc340cpi ... Show all

Table of Contents