LG LT-C1260CL Service Manual
LG LT-C1260CL Service Manual

LG LT-C1260CL Service Manual

Ceiling cassette air conditioner

Advertisement

Ceiling Cassette
Air Conditioner

SERVICE MANUAL

MODELS: LT-C1260CL
LT-C1260HL
LT-C1262HL

Advertisement

Table of Contents
loading

Summary of Contents for LG LT-C1260CL

  • Page 1: Service Manual

    Ceiling Cassette Air Conditioner SERVICE MANUAL MODELS: LT-C1260CL LT-C1260HL LT-C1262HL...
  • Page 2: Table Of Contents

    Contents Functions ..........................3 Product Specifications (Cooling & Heating) ................5 Dimensions ..........................7 Refrigeration Cycle Diagram ....................8 Wiring Diagram ........................9 Operation Details ........................10 Installation of Indoor, Outdoor Unit ..................13 2-way, 3-way valve ........................29 3-way Valve ..........................31 Cycle Troubleshooting Guide ....................36 Electronic Parts Troubleshooting Guide ................37 Electronic Control Device .....................40 Schematic Diagram .......................41 Exploded View and Replacement Parts List ...............42...
  • Page 3: Functions

    Functions Indoor Unit Operation ON/OFF by Remote controller Sensing the Room Temperature • Room temperature sensor. (Thermistor) Room temperature control • Maintains the room temperature in accordance with the Setting Temp. • Indoor fan is delayed for 5 seconds at the starting. Starting Current Control Time Delay Safety Control •...
  • Page 4: Remote Controller

    Remote Controller Operation ON/OFF Operation Mode Selection Cooling Operation Mode ( Soft Dry Operation Mode ( Heating Operation Mode ( Auto Operation Mode ( (Cooling (Heating model only) model only) Fan Speed Selection AUTO (Low) (Med) (High) Room Temperature Display : High:39°C ↔...
  • Page 5: Product Specifications (Cooling & Heating)

    Product Specifications (Cooling & Heating) LT-C1260CL LT-C1260HL LT-C1262HL Model Power Supply ø, V, Hz 1, 220-240, 50 1, 220-240, 50 1, 220-240, 50 3,024(3,516) 3,024(3,516) 3,024(3,516) Capacity Cooling kcal/h(W) Btu/h 12,000 12,000 12,000 3,024(3,516) 3,024(3,516) Heating kcal/h(W) 12,000 12,000 Btu/h...
  • Page 6: Dimensions

    Dimensions (1) Indoor Unit 1050 694.5 931.6 893.4 16.7 42.7 Ø80 Ø55 91.6 97.7 116.3 141.8 –6–...
  • Page 7 (2) Outdoor Unit Gas side (3-way valve) Liquid side (2-way valve) MODEL 12K Btu Series unit –7–...
  • Page 8: Refrigeration Cycle Diagram

    Refrigeration Cycle Diagram INDOOR UNIT OUTDOOR UNIT CHECK VALVE LIQUID SIDE (Heating Model only) 2-WAY VALVE CAPILLARY TUBE HEAT HEAT EXCHANGE EXCHANGE (EVAPORATOR) (CONDENSER) GAS SIDE REVERSING 3-WAY VALVE ACCUMU VALVE LATOR (Heating Model Only) COOLING COMPRESSOR HEATING Elevation (m) * Additional Pipe Size Length (m)
  • Page 9: Wiring Diagram

    Wiring Diagram HEAT PUMP OUTDOOR WIRING DIAGRAM INDOOR WIRING DIAGRAM TEMP PIPE THERMISTOR FLOAT S/W THERMISTOR COMP CAPACITOR C S R MOTOR CN-ROOM CN-PIPE CN-FLOAT MAIN PCB ASSY CN-MOTOR INDOOR MOTOR 4WAY CN-D/PUMP OUT FAN CAPACITOR STEP DRAIN MOTOR PUMP REMOTE FUSE T3.15A CONTROL...
  • Page 10: Operation Details

    Operation Details (1) The function of main control 1. Time Delay Safety Control • 3min The compressor is ceased for 3minutes to balance the pressure in the refrigeration cycle. (Protection of compressor) • 5sec Vertical air flow direction control louvers open in 5 seconds to prevent noise between louvers and wind. •...
  • Page 11 6. Heating Mode Operation (Except Cooling Model) The unit will operate according to the setting by the remote controller and the operation diagram is shown as following. Intake Air temp. minimum 3min Setting temp.+3°C (Compressor OFF) Setting temp. (Compressor ON) minimum minimum minimum...
  • Page 12 8. Defrost Control • Defrost operation is controlled by timer and sensing the indoor piping temperature. • The defrost starts only when the outdoor pipe temperature falls below -6°C after 45 minutes passed from starting of heating operation. • Defrost ends after 9 minutes 30 seconds passed from starting of defrost operation or when the outdoor pipe temperature rises over 12°C even if before 12 minutes.
  • Page 13: Installation Of Indoor, Outdoor Unit

    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. Ceiling Ceiling Board • There should not be any obstacles to prevent the Ceiling Board air circulation.
  • Page 14: Ceiling Opening Dimensions And Hanging Bolt Location

    2. Ceiling opening dimensions and hanging bolt location • The dimensions of the paper model for installing are the same as those of the ceiling opening dimen- 1,000 (Ceiling opening) sions. 931.6 893.4 (Hanging bolt) Ceiling Level gauge CAUTION • This air-conditioner uses a drain pump. •...
  • Page 15: The Indoor Unit Installation

    3. The Indoor Unit Installation Ceiling Keep the length of the bolt Hanging bolt from the bracket to 40mm (W3/8 or M10) Flat washer for M10 (W3/8 or M10) (accessory) Air Conditioner body Ceiling board Ceiling board Spring washer (M10) Flat washer for M10 (accessory) Set screw of...
  • Page 16: Wired Remote Control Installation

    WIRED REMOTE CONTROL INSTALLATION DISASSEMBLING • Separate the under plate from Remote control box. Front case Lever carefully Remote control the box open box body using a screw • Fix the cord clamps on the wall by ø 3 tapping driver, etc.
  • Page 17: Wiring Connection

    5. Wiring Connection • Open the control box cover and connect the Remote controller cord and Indoor power wires. Power cord Control box cover Remote control cord In-Out connecting wire • Heat Pump Model Terminal Block of Indoor Unit Terminal Block of Outdoor Unit 1(L) 2(N) 4(L) 5(N) 4(L) 5(N)
  • Page 18: Electrical Wiring

    ELECTRICAL WIRING 1. All wiring must comply with LOCAL REGULATIONS. 2. Select a power source that is capable of supplying the current required by the air conditioner. 3. Feed the power source to the unit via a distribution switch board designed for this purpose. 4.
  • Page 19: Connecting Pipes To The Indoor Unit

    6. Connecting Pipes to the Indoor Unit • Preparation of Piping Main cause of gas leakage is defect in flaring work. Carry out correct flaring work in the following procedure. 1) Cut the pipes and the cable. Use the accessory piping kit or the pipes purchased Copper locally.
  • Page 20 Piping Connection 1. Form the piping according to its routing. Avoid bend- ing and bending back the same piping point more Liquid side than three times. (This will result in hardening the pipe.) Indoor 2. After deforming the piping, align centers of the union unit fitting of the indoor unit and the piping, and tighten Outdoor...
  • Page 21: Installation Of Decorative Panel

    7. Installation of Decorative Panel The decorative panel has its installation Before installing the decorative panel, direction. always remove the paper template. 1. Temporarily fix two decorative panel fixing screws (hexagon M6 screw) on the unit body. (Tighten by amount 10mm in length.) The fixing screws (hexagon M6 screw) are included the Indoor unit box.
  • Page 22: Indoor Unit Drain Piping

    CAUTION Install certainly the decorative panel. Cool air leakage causes sweating. Water drops fall. Good example Bad example Air conditioner Air conditioner unit unit Cool air leakage (no good) Ceiling Ceiling board board Decorative panel Decorative panel Fit the insulator (this part) and be careful for cool air leakage 8.
  • Page 23: Heat Insulation

    HEAT INSULATION 1. Use the heat insulation material for the refrigerant piping which has an excellent heat-resistance (over 120°C). Fastening band 2. Precautions in high humidity circumstance: (accessory) This air conditioner has been tested according to the "KS Standard Conditions with Mist" and confirmed that there is not any default.
  • Page 24: Test Running

    In case of the Outdoor Unit being installed Seal a small opening above position of the Indoor Unit. around the pipings with gum type sealer. 2. Tape the Pipings and Connecting cable from bot- Trap tom to top. 3. Form the pipings gathered by taping along the exterior wall, and make the trap prevent water from entering into the room.
  • Page 25 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 dis- charge air.
  • Page 26: Optional Operation

    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 temperature is controlled by the thermistor of the main body. •...
  • Page 27: Outdoor Wiring Diagram

    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 comfortable atmosphere to consumers. Procedure 1. Choose the selectable position in the table after measuring the height of ceiling. Ceiling height Mode of slide switch Change of air volume...
  • Page 28: Wiring Design

    3) Group Control(Optional Wiring) • You can use a group control operation after connecting the brown and yellow wire of each air-conditioner. • Remove the resistor "OP 7" in remote controller. • It operates maximum 16 Units by only one Wired Remote Controller, and each Unit starts sequentially to prevent overcurrent.
  • Page 29: 2-Way, 3-Way Valve

    2-way, 3-way Valve 2-way Valve (Liquid Side) 3-way Valve (Gas Side) Valve cap Hexagonal wrench (4mm) Open position Flare nut Flare nut Closed position Open position Closed position piping piping Service Service connection connection port cap port To outdoor unit To outdoor unit Works Shaft position...
  • Page 30: Air Purging

    1. Air purging Required tools : hexagonal wrench, adjustable The air in the indoor unit and in the piping must be wrench, torque wrenches, wrench to purged. If air remains in the refrigeration pipes, it will hold the joints, and gas leak affect the compressor, reduce to cooling capacity, and detector.
  • Page 31: 3-Way Valve

    3-way Valve 1. Pumping down Liquid side Indoor unit Open Outdoor unit 3-Way valve Gas side Closed 3-Way valve CLOSE CLOSE Purge the air • Procedure (6) Operate the air conditioner in cooling mode (1) Confirm that both liquid side and gas side and stop it when the gaug e indicates valves are set to the open position.
  • Page 32 1) Re-air purging (Re-installation) Liquid side Indoor unit Closed Outdoor unit 2-Way valve Gas side Closed 3-Way valve Gas cylinder OPEN CLOSE • Procedure (6) Disconnect the charge set and the gas (1) Confirm that both the liquid side valve and the cylinder, and set the 2-way and 3-way valves gas side valve are set to the closed position.
  • Page 33 2) Balance refrigerant of the 3-way valve (Gas leakage) Liquid side Indoor unit Outdoor unit 2-Way valve Open Gas side 3-Way valve Open OPEN CLOSE • Procedure (1) Confirm that both the liquid side and gas side (3) Open the valve (Lo side) on the charge set valves are set to the back seat.
  • Page 34 2. Evacuation (All amount of refrigerant leaked) Liquid side Indoor unit Outdoor unit 2-Way valve Open Gas side 3-Way valve Open Vacuum pump OPEN CLOSE • Procedure (1) Connect the vacuum pump to the center hose (3) Close the valve (Lo side) on the charge set, of charge set center hose turn off the vacuum pump, and confirm that the gauge needle does not move (approxima-...
  • Page 35: Gas Charging

    3. Gas Charging (After Evacuation) Liquid side Indoor unit Open Outdoor unit 2-Way valve Gas side Open 3-Way valve Check valve Charging cylinder OPEN CLOSE • Procedure (1) Connect the charge hose to the charging This is different from previous procedures. cylinder.
  • Page 36: Cycle Troubleshooting Guide

    Cycle Troubleshooting Guide Trouble analysis 1. Check temperature difference between intake and discharge air and operating current. Temp. difference : approx. 0°C All amount of refrigerant leaked out Current : less than 80% of Check refrigeration cycle rated current Temp. Difference Refrigerant leakege Temp.
  • Page 37: Electronic Parts Troubleshooting Guide

    Electronic Parts Troubleshooting Guide Possible Trouble 1 : The unit does not operate. Check the FUSE Is the input voltage and the wiring diagram. of transformer AC230V? Is the input voltage Check the main P.C.B of IC03D about DC12V? pattern. Is the output voltage Exchange IC03D.
  • Page 38 Possible Trouble 2 : The indoor fan does not operate. Is it the HOT It is normal operation. START mode? Is IC01M operated Exchange IC01M. normally? Is the each Relay Exchange Relay. any problem? Check the fan motor and connector.(CN-MOTOR) Possible Trouble 3 : Ineffective Heating Adjust operation mode.
  • Page 39 Possible Trouble 4 : Auto Air direction louver does not operate. Is IC01M operated Exchange IC01M. normally? Check the motor and connector. (CN-LOUVER) : Wired remote controller does not operate. Possible Trouble 5 Check the parts of Is the LCD operated communication.
  • Page 40: Electronic Control Device

    Electronic control device MAIN P.C.B ASM –40–...
  • Page 41: Schematic Diagram

    Schematic Diagram –41–...
  • Page 42: Exploded View And Replacement Parts List

    Exploded View and Replacement Parts List 1. Indoor Unit –42–...
  • Page 43: Replacement Parts List

    Replacement parts list PART No. LOCATION No. DESCRIPTION REMARK LT-C1260CL LT-C1260HL LT-C1262HL 137213 FRONT PANEL ASSY 3721A10023E 3721A10023D 3721A10023F 268712 DISPLAY PWB ASSY 6871A20096B 6871A20096B 6871A20096B 159830 FILTER ASSY 5231A10003A 5231A10003A 5231A10003A 135802 DOOR LOCK 3580A20005A 3580A20005A 3580A20005A 135312 INLET GRILLE ASSY...
  • Page 44 2. Outdoor Unit –44–...
  • Page 45 • Parts List PART No. LOCATION No. DESCRIPTION REMARK LT-C1260CL LT-C1260HL LT-C1262HL 430410 BASE ASSY, OUTDOOR 3041A20008F 3041A20008F 3041A20008F 447910 BARRIER ASSY 4791A30002A 4791A30002A 4791A30002A 546810 MOTOR ASSY 4681A20004H 4681A20004H 4681A20004H 559010 FAN ASSY 5901A10004A 5901A10004A 5901A10004A 437212 PANEL ASSY, REAR...
  • Page 46 February, 2001 P/No.: 3828A20048E Printed in Korea...

This manual is also suitable for:

Lt-c1262hlLt-c1260hl

Table of Contents