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LG LC240CP Service Manual

Ceiling cassette air conditioner
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See also: Owner's Manual , Installation Manual
LG
Ceiling Cassette
Air Conditioner

SERVICE MANUAL

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

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Summary of Contents for LG LC240CP

  • Page 1: Service Manual

    Ceiling Cassette Air Conditioner SERVICE MANUAL 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...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 2 Ceiling Cassette Air Conditioner...

  • Page 3: Models List

    Models List 1.1 Cooling Only Nominal Capacity Btu/h Type Ceiling Cassette Ceiling Cassette Indoor Units Model Name LCN240CP LCN380CP Outdoor Units Power Supply Model Name Ø,V,Hz LCU240CP 1Ø, 208-230V, 60Hz LCU380CP Service Manual 3...

  • 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

    Wired LCD Remote Controller Wireless Remote Controller Zero Standby Power Zone Control Notes : O : Basic Optional : Factory-Installed Accessory : Field-Installed - : Not available on this system Ceiling Cassette LC240CP Auto 3/4/- Accessory Optional LC380CP Auto 3/4/- Accessory Optional...

  • 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 35.0°C(95.0°F) DB /23.9°C(75.0°F) WB - Interconnecting Piping Length 7.5m - Level Difference of Zero. 2. Due to our policy of innovation some specifications may be changed without notification. 14 Ceiling Cassette Air Conditioner W(kcal/h) Btu/h W(kcal/h) Btu/h ø,V,Hz...
  • Page 15 Indoor Unit System Outdoor Unit Decoration Panel Cooling Capacity Heating Capacity Input Cooling/Heating Running Current Cooling/Heating Power Supply Power Factor E.E.R Cooling C.O.P Heating Setting Temperature Range(cool/heat) Dehumidification Rate Refrigerant Control Refrigerant Charge Indoor Unit Output Model No. of Poles Indoor fan motor Input Running Current...

  • Page 16: Dimensional Drawings

    Model No.: LCN240CP Number Liquid pipe connection Gas pipe connection Drain pipe connection Power supply connection Air discharge grill Air suction grill 16 Ceiling Cassette Air Conditioner Name 790 (Ceiling opening) 572(Hanging bolt) 744 Unit size Unit:mm (unit : mm) Descripition Ø6.35 flare (1/4")
  • Page 17 Model No.: LCN380CP Number Liquid pipe connection Gas pipe connection Drain pipe connection Power supply connection Air discharge grill Air suction grill Name 875 (Ceiling opening) 785(Hanging bolt) 840 Unit size Unit:mm (unit : mm) Descripition Ø6.35 flare (1/4") Ø15.88 flare (5/8") Service Manual 17...

  • Page 18: Outdoor Units

    2. Outdoor Units Model No.: LCU240CP Model No. 18 Ceiling Cassette Air Conditioner LCU240CP 74.5 Gas side 3-way valve Liquid side 3-way valve...
  • Page 19 Model No.: LCU380CP Model No. LCU380CP 1,225 1,135 Liquid side 3-way valve Gas side 3-way valve Service Manual 19...

  • Page 20: Wiring Diagrams

    Wiring Diagrams Wiring Diagrams 1. Indoor Unit LCN240CP 20 Ceiling Cassette Air Conditioner...
  • Page 21 Wiring Diagrams 2. Outdoor Unit LCU240CP LCU380CP Service Manual 21...

  • Page 22: Refrigerant Cycle Diagrams

    Refrigerant Cycle Diagrams 1. Cooling Only Models INDOOR UNIT H/EX Capillary Tube Pipe Size(Diameter:Ø) inch Model LC240CP LC380CP 22 Ceiling Cassette Air Conditioner OUTDOOR UNIT COMPRESSOR GAS SIDE Gas Side ACCUM. LIQUID SIDE Liquid Side Piping length (ft.) Liquid Rated Max.

  • Page 23: 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 24: Indoor Unit Installation

    Spring Washer - M10 Plate Washer - M10 CAUTION • Tighten the nut and bolt to prevent unit falling. 24 Ceiling Cassette Air Conditioner Bolt Keep the length of the bolt from the bracket to 40mm Flat washer for M10...

  • Page 25: 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 26: Installation Of Decoration Panel

    Install certainly the decoration panel. Cool air leakage causes sweating. Water drops fall. 26 Ceiling Cassette Air Conditioner Before installing the decoration panel, always remove the paper template. ) on the screws fixed in step above, and slide the panel so...

  • Page 27: Heat Insulation

    1. Use the heat insulation material for the refrigerant piping which has an excellent heat-resistance (over 120°C). 2. Precautions in high humidity circumstance: This air conditioner has been tested according to the "KS Standard Conditions with Mist" and confirmed that there is not any default. However, if it...

  • Page 28: Drain Pipe Work

    I Install the drain raising pipes at a right angle to the indoor unit and no more than 300mm 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:...

  • Page 29: 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 30 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 31: Optional Operation

    9. Optional Operation 1) Two Thermistor System (1) Open the rear cover of the wired remote-controller to set the mode. (2) Select one of three selectable modes as follows. • Position 1: The room themperature is controlled by the thermistor of the wired remote-controller, control the temperature according to the position of wired remote-controller.
  • Page 32 • 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 0.5mm 32 Ceiling Cassette Air Conditioner Mode of slide switch Change of air volume...

  • Page 33: Troubleshooting Guide

    Troubleshooting Guide Cycle Troubleshooting Guide Trouble analysis 1. Check temperature difference between intake and discharge air, and operating current. Temp. difference Current Temp. Difference Temp. difference Current Operating Current Temp. difference Current Temp. difference Notice: Temperature difference between intake and discharge air depends on room air humidity. When the room air humidity is relatively higher, temperature difference is smaller.

  • Page 34: Electronic Parts Troubleshooting Guide

    Check the Fuse of outdoor PCB Ass'y. Check the connecting state of wires Check the Auto Addressing Work Confirm Auto Addresssing work method Replace the PCB Ass'y * The product's operation starts at three minutes after main power turning on 34 Ceiling Cassette Air Conditioner...
  • Page 35 Troubleshooting Guide Product doesn't operate with the remote controller. Trouble 2 Turn on main power. While the compressor has been stopped, the compressor does not operate owing to the delaying function for 3 minutes after stopped. When the compressor stopped Indoor Fan is driven by a low speed. At this point the wind speed is not controlled by the remote controller.
  • Page 36 • Check the circuit related to the relay. Check point Between two pin of DC part in relay for COMP 36 Ceiling Cassette Air Conditioner Turn on Main Power )" by setting the desired temperature of the COMP ON COMP OFF...

  • Page 37: When Indoor Fan Does Not Operate

    When indoor Fan does not operate Trouble 4 Check the connection of CN-FAN or CN-MOTOR 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.

  • Page 38: When Vertical Louver Does Not Operate

    • Confirm that there is DC + 12V between pin GND. • Confirm the assembly conditions that are catching and interfering parts in the rotation radial of the Vertical Louver 38 Ceiling Cassette Air Conditioner (RED) of CN-U/D and If there are no problems after above checks...
  • Page 39 Self-diagnosis Function I Error Indicator • The function is to self-diagnoisis airconditioner and express the troubles identifically if there is any trouble. • Error mark is ON/OFF for the operation LED of evaporator body in the same manner as the following table. •...
  • Page 40 7. If the voltage of the sensor is 2.5Vdc at 25°C, then sensor is normal. 8. If the resistance of the sensor is 0 or 5Vdc, then sensor is abnormal. ¡ Repair or Change the PCB. 40 Ceiling Cassette Air Conditioner Cause of error •...
  • Page 41 Troubleshooting CH03 Display Title code Communication Wired R/C 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.
  • Page 42 3. Check the level of water 4. Check the volt. Of Drain pump power supply. (AC 230V) ¡ Repair or Change the main PCB. 42 Ceiling Cassette Air Conditioner Cause of error • The connection of wire(Drain pump/ Float switch) •...
  • Page 43 Troubleshooting CH05, CH53 Display Title code Communication (Indoor ¡ Outdoor) 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.
  • Page 44 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. 44 Ceiling Cassette Air Conditioner Cause of error • Check the connection of “CN_Press”. • Low / High press •...
  • Page 45 Troubleshooting CH32, CH33 Display Title code D-pipe (Inverter) temp. high (105°C ) D-pipe (Constant) temp. high (105°C ) COMP OFF 105°C LEV OPEN/Hz down 95°C LEV OPEN/Hz down 90°C NORMAL Inverter Check Point • CH 32 1. Check the install condition for over load. 2.
  • Page 46 2. Estimate the voltage of each sensor.(Plugged) 3. If the resistance of the sensor is 0 kΩ or ∞, then sensor is abnormal. Ω 46 Ceiling Cassette Air Conditioner Cause of error • Open / Short • Normal resistor : 200KΩ / at 25°C (Unplugged) •...
  • Page 47 Troubleshooting CH51, CH60 Display Title code Capacity Error EEPROM Check sum Check Point • CH 51 1. Check the indoor unit capacity. Cause of error • Over Capacity • Check the indoor unit capacity. Combination • Undder Capacity • Check the combination table. Combination •...
  • Page 48 Normal (Hz) Check Point • CH 61 1. Check the install condition for over load. (Refrigerant, Pipe length, Blocked, …) 48 Ceiling Cassette Air Conditioner Cause of error • Condenser pipe sensor detected high temp.(65°C) • Heat sink sensor detected high temp.(85°C)

  • Page 49: 3-Way)Valve

    (3-way) Valve To piping connection Works Shaft position Shipping (with valve cap) Air purging (Installation) (counter-clockwise) Operation (with valve cap) Pumping down (Transfering) (clockwise) Evacuation (Servicing) Gas charging (Servicing) Pressure check (Servicing) Gas releasing (Servicing) 3-way Valve (Liguid Side) Valve cap Open position Closed position Service...

  • Page 50: 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 indicating 1kg/ 8.

  • Page 51: Vacuum Pump

    (2) Evacuation (All amount of refrigerant leaked) Indoor unit Vacuum pump • Procedure 1. Confirm that both the liguid side valve and gas side valve are set to the opened position. 2. Connect the vaccum pump to the center hose of the manifold gauge.

  • Page 52: Gas Charging

    - Stopping partway will allow the gas to be discharged. - If the system has been charged with liquid refrigerant while operating the air conditioner turn off the air conditioner before disconnecting the hose. 5. Mount the valve stem nuts and the service port nut.

  • Page 53: Electronic Control Device

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

  • Page 54: Exploded View And Replacement Parts List

    Exploded View and Replacement Parts List 1. Indoor Unit Model No.: LCN240CP/LCN340CP 330870 54 Ceiling Cassette Air Conditioner 249951 159830 354211-2 130411 263230 158591 349490 266090 268714 263230 354211-1 55211-2 552111 352118-1 266012...
  • Page 55 Exploded View and Replacement Parts List 130411 W0CZZ 346810 359012 130911-2 130911-1 267110-1 267110-2 Service Manual 55...
  • Page 56 DRAIN PAN ASSEMBLY 346810 MOTOR ASSEMBLY,INDOOR 349490 ORIFICE ASSEMBLY 352118 TUBE ASSEMBLY,MENIFOLD(INDOOR) 354211 EVAPORATOR ASSEMBLY,BENDING 359012 FAN ASSEMBLY,TURBO 552111 TUBE ASSEMBLY,CAPILLARY 56 Ceiling Cassette Air Conditioner Part No. REMARKS LCN240CP 3041A10069A 3091A10075E 3091A10085C 5859A10006G 5983A10003D 4995A10224E 6323A30002A 6323A3226W 6601A20001K 6609A20009L...
  • Page 57 Parts List LOCATION DESCRIPTION 130411 BASE ASSEMBLY,WELD[INDOOR] 130911 CABINET ASSEMBLY,INDOOR 130911 CABINET ASSEMBLY,INDOOR 158591 PUMP ASSEMBLY,WATER 159830 AIR CLEANER ASSEMBLY 249951 CONTROL BOX ASSEMBLY,INDOOR 263230-1 THERMISTOR ASSEMBLY 263230-2 THERMISTOR ASSEMBLY 266012 SWITCH ASSEMBLY,FLOAT 266090 H.V ASSEMBLY 267110 REMOTE CONTROLLER ASSEMBLY 267110 REMOTE CONTROLLER ASSEMBLY 268714...
  • Page 58 Exploded View and Replacement Parts List 2. OUTDOOR UNITS Model No.: LCU240CP 58 Ceiling Cassette Air Conditioner...

  • Page 59: Parts List

    Parts List LOCATION DESCRIPTION 349480 ORIFICE 433501 GRILLE,DISCHARGE 437211 PANEL ASSY,FRONT 546810 MOTOR ASSEMBLY,OUTDOOR 552112 TUBE ASSEMBLY,CONDENSER IN 552113 TUBE ASSEMBLY,CONDENSER OUT 552117 TUBE ASSEMBLY,SUCTION 552203-1 VALVE,SERVICE 552203-2 VALVE,SERVICE 554031 CONDENSER ASSEMBLY,BENT 554160 COMPRESSOR ASSEMBLY 559010 FAN ASSEMBLY,PROPELLER 435511 COVER CONTROL 649950 CONTROL BOX ASSEMBLY,OUTDOOR 268713...
  • Page 60 Exploded View and Replacement Parts List Model No.: LCN380CP 60 Ceiling Cassette Air Conditioner...
  • Page 61 Parts List LOCATION DESCRIPTION 137212 PANEL ASSEMBLY,SIDE 435512 COVER ASSEMBLY TOP 437211 PANEL ASSY,FRONT 135301 GRILLE,DISCHARGE 135314 GRILLE,REAR 546810 MOTOR ASSEMBLY,OUTDOOR 552112 TUBE ASSEMBLY,CONDENSER IN 552113 TUBE ASSEMBLY,CONDENSER OUT 552203-1 VALVE,SERVICE 552203-2 VALVE,SERVICE 554031 CONDENSER ASSEMBLY,BENT 554160 COMPRESSOR ASSEMBLY 559010 FAN ASSEMBLY,PROPELLER 649950 CONTROL BOX ASSEMBLY,OUTDOOR...
  • Page 62 Exploded View and Replacement Parts List Model No.: PT-CDC1 146811 268712 152312 135314 135802 137211 62 Ceiling Cassette Air Conditioner...
  • Page 63 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 Part No. REMARKS PT-CDC 3721A10106D 3531A10066A 5231A10004A 4681A20055A 6871A20096J 3580A20005A Service Manual 63...
  • Page 64 P/No.: 3828A20911A Printed in Korea...

This manual is also suitable for:

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