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LG LS-L1261CL Service Manual
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LG LS-L1261CL Service Manual

Room air conditioner
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Room Air Conditioner

SERVICE MANUAL

CAUTION
-BEFORE SERVICING THE UNIT, READ THE SAFETY
PRECAUTIONS IN THIS MANUAL.
-ONLY FOR AUTHORIZED SERVICE PERSONNEL.
MODEL : LS-L1261CL/CM/CN/CD/CS
LS-L1262CL/CM/CN/CD/CS
LS-L1263DL
LS-L1261EL/HL/HM/HN/HD/HS
LS-L1262HL/HM/HN/HD/HS
LS-L1220HL/HM/HN/HD/HS

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Summary of Contents for LG LS-L1261CL

  • Page 1: Room Air Conditioner

    Room Air Conditioner SERVICE MANUAL CAUTION -BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. -ONLY FOR AUTHORIZED SERVICE PERSONNEL. MODEL : LS-L1261CL/CM/CN/CD/CS LS-L1262CL/CM/CN/CD/CS LS-L1263DL LS-L1261EL/HL/HM/HN/HD/HS LS-L1262HL/HM/HN/HD/HS LS-L1220HL/HM/HN/HD/HS...

  • Page 2: Table Of Contents

    Contents Functions ..........................3 Product Specifications ......................5 Dimensions ..........................6 Refrigeration Cycle Diagram ....................8 Wiring Diagram ........................9 Operation Details ......................... 10 Display Function ........................17 Self-diagnosis Function ....................... 17 Installation ..........................18 Operation ..........................34 Disassembly of the parts (Indoor Unit) ................36 2-way, 3-way Valve ........................

  • 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. Starting Current Control • Indoor fan is delayed for 5 sec at the starting. Time Delay Safety Control •...

  • Page 4: Remote Controller

    Remote Controller Operation ON/OFF Operation Mode Selection Cooling Operation Mode.( Auto Operation Mode.( (Cooling (Heating Healthy Dehumidification Operation Mode.( Heating Operation Mode.( model only) model only) Fan Speed Selection (Low) (Med) (High) (CHAOS) Room, Temperature Display : (High:39°C Low:11°C) Temperature Setting HIGH TEMPERATURE Down to 18°C...

  • Page 5: Product Specifications

    Product Specifications Model Name LS-L1261/1262CL/1263DL LS-L1261/1262HL/1261EL LS-L1220HL Item Unit Cooling Capacity 12,000 Btu/h Heating Capacity 13,000 12,500 Moisture Removal Power Source Ø, V, Hz 1Ø, 220-240V, 50Hz 1Ø, 220V, 60Hz Indoor Air Circulation /min Outdoor Indoor Noise Level dB (A)±3 Outdoor Cooling 1,190...

  • Page 6: Dimensions

    Dimensions (1) Indoor Unit Installation plate MODEL 12K Btu Series Unit...
  • Page 7 (2) Outdoor Unit Gas side (3-way valve) Liquid side (2-way valve) MODEL 12K Btu Series unit...

  • 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 MAX. Pipe size(Diameter:Ø) MODEL Piping length Elevation...

  • Page 9: Wiring Diagram

    Wiring Diagram (1) Indoor Unit 1. LS-L1261/1262CL/1263DL 2. LS-L1261/1262/1220HL/1261EL POWER POWER FORCED FORCED MAIN PCB MAIN PCB OPERATION OPERATION AUTO AUTO RESTART RESTART TRIAC TRIAC REMOTE REMOTE CONTROL CONTROL MOTOR MOTOR THERMISTOR THERMISTOR STEP STEP SH-CAPA. SH-CAPA. MOTOR MOTOR BL/RIBBED H.V.B A/CL H.V.B...

  • Page 10: Operation Details

    Operation Details 1. MAIN UNIT FUNCTION • DISPLAY 1) C/O Model Operation Indicator • On while in appliance operation, off while in appliance pause • Flashing while in disconnection or short in Thermistor (3 sec off / 0.5 sec on) Sleep Timer Indicator •...
  • Page 11 • While in compressor off, the indoor fan repeats low airflow speed and pause. • While the intake air temp is between compressor on temp. and compressor off temp., 10-min dehumidifica- tion operation and 4-min compressor off repeat. Compressor ON Temp. Setting Temp+0.5°C Compressor OFF Temp.
  • Page 12 Fuzzy Operation (C/O Model) • According to the temperature set by Fuzzy rule, when the intake air temp is 0.5°C or more below the setting temp, the compressor is turned off. When 0.5°C or more above the setting temp, the compressor is turned on. Compressor ON Temp Setting Temp + 0.5°C Compressor OFF Temp...
  • Page 13 2) Fuzzy Operation for Dehumidification • According to the setting temperature selected by Fuzzy rule, when the intake air temp is 0.5°C or more below the setting temp, the compressor is turned off. When 0.5°C or more above the setting temp, the compressor is turned on.
  • Page 14 Off-Timer Operation • When the set time is reached after the time is input by the remote control, the appliance stops operating. • The timer LED is on when the off-timer is input. It is off when the time set by the timer is reached. •...
  • Page 15 Jet Cool Mode Operation (C/O Model) • If the Jet Cool key is input at any operation mode while in appliance operation, the Jet Cool mode operates. • In the Jet Cool mode, the indoor fan is operated at super-high speed for 30 min at cooling mode operation. •...
  • Page 16 Forced Operation (H/P Model) • To operate the appliance by force in case that the remote control is lost, the forced operation selection switch is on the main unit of the appliance to operate the appliance in the standard conditions. •...

  • Page 17: Display Function

    Display Function 1. Heating Model 2. Cooling Model Operation Indicator Operation Indicator • Cooling, Soft Dry, Fan, Heating • Cooling, Soft Dry, Fan Sleep Timer Indicator Sleep Timer Indicator • Sleep Mode • Sleep Mode Timer Indicator Timer Indicator • Timer Mode •...

  • Page 18: Installation

    Installation 1. 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. More than 5 cm More than • There should not be any obstacles to prevent the 5 cm air circulation.
  • Page 19 2) Indoor Unit Installation The mounting wall should be strong and solid enough to protect it from the vibration. Installation plate 1.Mount the installation plate on the wall with four Type "A" screws. (if mounting the unit on the concrete wall, consider using anchor bolts.) •...

  • Page 20: Piping And Drainage Of Indoor Unit

    2. Piping and Drainage of Indoor Unit 1) Preparation of Piping Pipe cutter 1. Cut the pipes and the cable. • Use the accessory piping kit or the pipes pur- chased locally. Slanted Rough • Measure the distance between the indoor and the outdoor unit.
  • Page 21 2) Connection of Pipings 1. Remove the tubing holder. 2. Route the drain hose and the indoor tubing. Tubing holder To remove the holder, press the bottom of chassis near the holder Pull upward and pull the tab For right rear piping out of its hole.
  • Page 22 5. Bend the tubing as shown in the figure and bind the piping, the connecting cables and the drain hose altogether. • Make a small loop for easy connection later. 6. Wrap the tubing, the drain hose and the con- necting cable with tape.
  • Page 23 For left rear piping Installation plate 3. Insert the connecting cables, the drain pipe and connecting piping through the piping hole on the wall. Pull Pull 4. Connect the piping and the indoor tubing, and drain hose and drain pipe and place the drain Tubing holder pipe into the chassis.
  • Page 24 6. Wrap the insulation material around the connect- ing portion. CAUTION Take care to arrange the piping, drain hose and Taping cables as the figure 7 page for inserting it into the indoor unit and mount the indoor unit on the installa- Indoor/outdoor tion plate.
  • Page 25 3. Connecting Piping and Cable to the outdoor unit 1) Connecting the piping to the Outdoor unit 1. Align the center of the piping and sufficiently tighten the flare nut with fingers. 2. Finally, tighten the flare nut with torque wrench until the wrench clicks.
  • Page 26 2) Connection of the cable Outdoor unit 1. Remove the cover control from the unit by loosen- ing the screw. Connect the wires to the terminals on the control board individually as the following. Terminal block (Pillar terminal) Over 5mm 1) Cooling only type Holder for power supply...
  • Page 27 4. Checking the Drainage and Connecting the cable to Indoor unit 1) Checking the Drainage 1. Remove the Grille from the cabinet. • Set the up-and-down air direction louver to the open position (horizontally) by finger pressure. • Remove the securing screws. •...
  • Page 28 2) Connecting of the cable to the indoor unit 1. Connect the wires to the terminals on the con- trol board individually according to the out- door unit connection. • Ensure that the color of the wires of outdoor unit and the terminal No. are the same as the indoor unit.
  • Page 29 3) Form the piping 1. Wrap the connecting portion of indoor unit with the Insulation material and secure it with two Plastic Bands.(for the right piping) • If you want to connect an additional drain hose, the end of the drain-outlet should be off the Taping ground.(Do not dip it into water, and fix it on the Drain hose...

  • Page 30: Air Purging Of The Piping And Indoor Unit

    5. Air Purging of the Piping and Indoor Unit 1) Air purging Terminal block The air remaining which contains moisture in the (pillar terminal) refrigeration cycle may cause a malfunction on the compressor. Gas side 1. Remove the caps from the 2-way and 3-way valves.
  • Page 31 8. Checking a gas leakage (1) Connect the manifold gauge to the service port of 3-way valve. Measure the pressure. (2) Keep it for 5-10 minutes. Ensure if the pressure indicated on the gauge is as same as that of measured at first time. Liquid side Indoor unit Outdoor unit...

  • Page 32: Pipe Length And The Elevation

    Additional Refrig- Standard Elevation Length Model erant Length(m) Ⓑ (m) (g/m) Ⓐ (m) LS-L1261CL/HL LS-L1262CL/HL LS-L1220HL Indoor unit Indoor unit Oil trap Outdoor unit Outdoor unit In case more than 5m CAUTION • Capicity is based on standard length and maximum allowance length is the basis of reliability.

  • Page 33: Test Running

    7. Test running 1) Connection of power supply 1. Connect the power supply cord to the inde- pendent power supply. Battery Cover • Circuitbreaker is required. 2. Prepare the remote controller. • Remove the battery cover from the remote controller according to the arrow direction. •...

  • Page 34: Operation

    Operation (1) Name and Function-Remote Control (Cooling Models) Remote Control START/STOP BUTTON Operation starts when this button is pressed and stops when the button is pressed again. Signal transmitter ROOM TEMPERATURE SETTING BUTTONS Used to select the room temperature. Transmits the signals INDOOR FAN SPEED SELECTOR to the room air conditioner.
  • Page 35 (2) Name and Function-Remote Control (Heat Pump Models) Remote Control START/STOP BUTTON Operation starts when this button is pressed and stops when the button is pressed again. Signal transmitter ROOM TEMPERATURE SETTING BUTTONS Used to select the room temperature. Transmits the signals to the room air conditioner.

  • Page 36: Disassembly Of The Parts (Indoor Unit)

    Disassembly of the parts (Indoor unit) Warning : Disconnect the unit from power supply before making any checks. Be sure the power switch is set to “OFF”. To remove the Grille from the Chassis. • Set the up-and-down air discharge louver to open position (horizontally) by finger pressure.
  • Page 37 2. To remove the Control Box. • Remove 2 securing screws. • Pull the control box out from the chassis carefully. 3. To remove the Discharge Grille. • Unhook the discharge grille and pull the discharge grille out from the chassis carefully. 4.
  • Page 38 • Unhook the tab on the right inside of the chassis at the same time, slightly pull the evaporator toward you until the tab is clear of the slot. 5. To remove the Cross-Flow Fan • Loosen the screw securing the cross-flow fan to the fan motor (do not remove).
  • Page 39 LS-L1262CL/HL Warning : Disconnect the unit from power supply before making any checks. Be sure the power switch is set to “OFF”. To remove the Grille from the Chassis • Set the up-and-down air discharge louver to open position (horizontally) by finger pressure. •...
  • Page 40 2. To remove the Control Box. • Remove 2 securing screws. • Pull the control box out from the chassis carefully. 3. To remove the Discharge Grille. • Remove the securing screw. • Pressing the right side of the discharge grille downward slightly, unhook the discharge grille.
  • Page 41 • Unhook the tab on the right inside of the chassis at the same time, slightly pull the evaporator toward you until the tab is clear of the slot. 5. To remove the Cross-Flow Fan • Loosen the screw securing the cross-flow fan to the fan motor (do not remove).

  • Page 42: 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 43: 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 44: Pumping Down

    2. Pumping down Liquid side Indoor unit Outdoor unit Open 2-Way valve Gas side Closed 3-Way valve CLOSE CLOSE Purge the air • Procedure (6) Operate the air conditioner at the cooling (1) Confirm that both the 2-way and 3-way valves cycle and stop it when the gauge indicates are set to the open position.
  • Page 45 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 2-way valve and the 3- cylinder, and set the 2-way and 3-way valves way valve are set to the closed position.
  • Page 46 2) Balance refrigerant of the 2-way, 3-way valves (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 2-way and 3-way valves are set to the back seat. (2) Connect the charge set to the 3-way valve’s port.
  • Page 47 3. 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 charge set’s center hose (2) Evacuation for approximately one hour. –...

  • Page 48: Gas Charging

    4. 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 49: 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 Current : less than 80% of out. Check refrigeration cycle. rated current Temp.

  • Page 50: Electronic Parts Troubleshooting Guide

    Electronic Parts Troubleshooting Guide 1. Product does not operate at all. (* Refer to Electronic Control Device drawing and Schematic diagram.) Turn off Main Power (After 10 seconds) Turn on Main Power Does "beeping" sound is made from the Indoor Unit? Primarily, the operating condition of Micom is OK.
  • Page 51 2. The product is not operate with the remote control. 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 52 3. Compressor/Outdoor Fan are unable to drive. Turn on Main Power Operate "Cooling Mode( )" by setting the desired temperature of the 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 53: When Indoor Fan Does Not Operate

    4. When indoor Fan does not operate. Turn off Main power Check the connection of CN-MOTOR Check the Fan Motor Check the Fuse(AC250V/T2A) Check the related circuit of indoor Fan Motor. • The pin NO 63 of Micom, and the part for driving TRIAC(the input and output signal of IC01M, PIN NO 1, 16) •...
  • Page 54 5. When Vertical Louver does not operate. • 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 55 6. When Heating does not operate Turn ON Main Power Operate “Heating Mode( )” by setting the desired temperature of the remote control is higher than one of the indoor temperature by 2°C at least. In heating Mode, the indoor fan operates in case the pipe temperature is higher than 28°C.
  • Page 56 Turn off Main Power • Check the electrical wiring diagram of outdoor side. • Check the abnormal condition for the component of Compressor/Outdoor Fan Motor, 4 way. • Check the "open" or "short" of connecting wires between indoor and outdoor. -56-...

  • Page 57: Electronic Control Device

    Electronic Control Device (1) MAIN P.W.B ASM (2) MAIN P.W.B ASM PCB ASS'Y SVC PART LIST OPTIONAL FUNCTION MODEL P/NO OR1H OR2H OR3H OR4H OR5H OR6H LS-L1261CL/1263DL 6871A10009B 6.8K OPEN 5.1K LS-L1262CL 6871A10009D 6.8K OPEN 5.1K LS-L1261HL/EL 6871A10009A 5.1K LS-L1262HL 6871A10009M 5.1K...
  • Page 58 (2) Display Ass'y • LS-1261/1262CL/1261EL(P/NO.:6871A30009Q) • LS-L1220/1261/1262HL/1263DL(P/NO.:6871A30009Q) -58-...

  • Page 59: Schematic Diagram

    Schematic Diagram Cooling Only Series -59-...
  • Page 60 Heat Pump Series -60-...

  • Page 61: Exploded View And Replacement Parts List

    Exploded View and Replacement Parts List 1. Indoor Unit 135312 152313 135314 152302 131410 733010 359011 342800 268712 159901-1 159901-2 346810 354212 35211B W0CZZ 263230 135311 352150 146811 267110 264110 249951 268714 -61-...
  • Page 62 Parts List(indoor) PART No. LOCATION DESCRIPTION REMARKS LS-L1261CL LS-L1262CL LS-L1261HL LS-L1262HL LS-L1220HL 131410 CHASSIS ASSY 3141A20003B 3141A20003D 3141A20003B 3141A20003D 3141A20003B 135311 GRILLE ASSY, DISCHARGE(INDOOR) 3531A10023A 3531A10023B 3531A10023A 3531A10023B 3531A10023A 135312 GRILLE ASSY, FRONT(INDOOR) 3531A10024G 3531A10045J 3531A10024F 3531A10045K 3531A10024F 135314 GRILLE ASSY, INLET SUB...
  • Page 63 Parts List(indoor) PART No. LOCATION DESCRIPTION REMARKS LS-L1261EL LS-L1263DL 131410 CHASSIS ASSEMBLY 3141A20003B 3141A20003B 135311 GRILLE ASSEMBLY, DISCHARGE(INDOOR) 3531A10023A 3531A10023A 135312 GRILLE ASSEMBLY, FRONT(INDOOR) 3531A10024F 3531A10024G 135314 GRILLE ASSEMBLY, INLET SUB 3531A20028F 3531A20028G 146811 MOTOR ASSEMBLY, STEP 4681AR2727H 4681AR2727H 152302 FILTER(MECH), A/C 5230A20004A 5230A20004A...
  • Page 64 2. Outdoor unit 437210 437212 554031 435511 546810 559010 649950 552111 554160 447910 550140 552203-1 430410 552203-2 -64-...
  • Page 65 Parts List(outdoor) PART No. LOCATION DESCRIPTION REMARKS LS-L1261CL LS-L1262CL LS-L1261HL LS-L1262HL LS-L1220HL 430410 BASE ASSY, OUTDOOR 3041A20008D 3041A20008D 3041A20008F 3041A20008F 3041A20008F 435511 COVER ASSY, CONTROL(OUTDOOR) 3551A30023C 3551A30023C 3551A30023G 3551A30023G 3551A30023E 437210 PANEL ASSY, FRONT(OUTDOOR) 3721A20027B 3721A20027B 3721A20027B 3721A20027B 3721A20027B 437212...
  • Page 66 Parts List(outdoor) PART No. LOCATION DESCRIPTION REMARKS LS-L1261EL LS-L1263DL 430410 BASE ASSEMBLY, OUTDOOR 3041A20008K 3041A20008J 435511 COVER ASSEMBLY, CONTROL(OUTDOOR) 3551A30023G 3551A30023C 437210 PANEL ASSEMBLY, FRONT(OUTDOOR) 3721A20027B 3721A20027B 437212 PANEL ASSEMBLY, REAR(OUTDOOR) 3721A20026B 3721A20026A 447910 BARRIER ASSEMBLY, OUTDOOR 4791A30002A 4791A30002A 546810 MOTOR ASSEMBLY, OUTDOOR 4681A20004H 4681A20004H...
  • Page 67 September , 2000 P/No.: 3828A30033U Printed in Korea...

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