LG LS-135GB Service Manual
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LG LS-135GB Service Manual

LG LS-135GB Service Manual

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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-135GB/GM/GR
LS-1351GB/GM/GR
LS-1352GB/GC/GD/GM/GR/GW
LS-1202GB/GC/GD/GM/GR/GW
LS-1262GB/GC/GD/GR/GW
C142CM/CR

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Summary of Contents for LG LS-135GB

  • Page 1: Room Air Conditioner

    WEBSITE http://lgservice.com Room Air Conditioner SERVICE MANUAL CAUTION -BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. -ONLY FOR AUTHORIZED SERVICE PERSONNEL. MODEL: LS-135GB/GM/GR LS-1351GB/GM/GR LS-1352GB/GC/GD/GM/GR/GW LS-1202GB/GC/GD/GM/GR/GW LS-1262GB/GC/GD/GR/GW C142CM/CR...

  • Page 2: Table Of Contents

    Contents LG Model Name ........................3 Functions ..........................4 Product References ......................7 Dimensions ..........................8 Refrigeration Cycle Diagram ....................10 Wiring Diagram........................11 Operation Details ......................... 12 Display Function ........................19 Installation ..........................20 Operation ..........................33 Disassembly of the parts (Indoor Unit) ................34 2-way, 3-way Valve........................

  • Page 3: Lg Model Name

    LG Model Name 2003~ Code Type Code of Model Meaning Producing Center, L: Chang-won R22 N: India Refrigerant A: Chang-won R410A Z: Brazil C: Chang-won R407C D: Indonesia T: China M: Mexico K: Turkey R22 V: Vietnam E: Turkey R410A...

  • Page 4: 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 5 Signal Receptor Each Icon turns on when the unit is operated, then the only Icon outline to be operated is bright. Cooling Mode Lights up during Cooling operation. (Outline) Auto Operation Mode Lights up during Auto operation. (Outline) Healthy Dehumidification Lights up during Healthy Dehumidification operation.

  • Page 6: Remote Control

    Remote Control 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) Room, Temperature Checking : (High:39°C Low:11°C) Temperature Setting HIGH TEMPERATURE Down to 18°C...

  • Page 7: Product References

    Product References Model Name LS-135GB/GM/GR LS-1351GB/GM/GR Item Unit 14,000 Cooling Capacity Btu/h Heating Capacity Moisture Removal 1Ø, 220-240V, 50Hz Power Source Ø, V, Hz Indoor Air Circulation /min Outdoor Indoor Noise Level dB (A)±3 Outdoor 1,140 Cooling Input Heating Running...

  • Page 8: Dimensions

    Dimensions (1) Indoor Unit Installation plate MODEL 14K Btu Series Unit 1030...
  • Page 9 (2) Outdoor Unit Gas side (3-way valve) Liquid side (2-way valve) MODEL 14K Btu Series unit...

  • Page 10: Refrigeration Cycle Diagram

    Refrigeration Cycle Diagram (1) Cooling Only Models INDOOR UNIT OUTDOOR UNIT LIQUID SIDE CAPILLARY TUBE HEAT HEAT EXCHANGE EXCHANGE (EVAPORATOR) (CONDENSER) GAS SIDE COMPRESSOR (2) Cooling & Heating Models INDOOR UNIT OUTDOOR UNIT CHECK VALVE LIQUID SIDE (Heating Model only) VALVE CAPILLARY TUBE HEAT...

  • Page 11: Wiring Diagram

    Wiring Diagram (1) Indoor Unit LS-135GB/GM/GR/LS-1351GB/GM/GR LS-1352GB/GC/GD/GM/GR/GW LS-1202GB/GC/GD/GM/GR/GW LS-1262GB/GC/GD/GR/GW C142CM/CR POWER MAIN PCB TRIAC THERMISTOR MOTOR DISPLAY STEP MOTOR SH-CAPA. STEP MOTOR OPTION FUSE AC250V/T2A H.V.B A/CL RY-COMP. OPTION TERMINAL 1 ( L ) 2 ( N ) BLOCK CN-MAIN...

  • Page 12: 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 13: Heating Mode Operation

    • 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 14 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 15 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 16: Sleep Timer Operation

    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 17: Forced Operation

    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 18: Auto Clean

    Remote Control Operation Mode • When the remote control is selected by the slide switch on the main unit, the appliance operates according to the input by the remote control. Protection of the evaporator pipe from frosting • If the indoor pipe temp is below 0°C in 7 min. after the compressor operates without any pause while in cool- ing cycle operation mode, the compressor and the outdoor fan are turned off in order to protect the indoor evaporator pipe from frosting.

  • Page 19: Display Function

    Display Function Signal Receptor Each Icon turns on when the unit is operated, then the only Icon outline to be operated is bright. Cooling Mode Lights up during Cooling operation. (Outline) Auto Operation Mode Lights up during Auto operation. (Outline) Healthy Dehumidification Lights up during Healthy Dehumidification operation.

  • Page 20: Installation

    Installation 1. Installation of indoor, Outdoor unit 1) Selection of the best location • Select a place so that the warm air and noise from the air conditioner do not disturb neighbors. 1. Indoor unit • Do not have any heat or steam near the unit. More than 60cm •...
  • Page 21 3) How to fix installation plate 4) Drill a hole in the wall The wall you select should be strong and solid enough • Drill the piping hole with a ø70mm hole core drill. Drill to prevent vibration the piping hole at either the right or the left with the hole slightly slanted to the outdoor side.

  • Page 22: Flaring Work And Connection Of Piping

    2. Flaring Work and Connection of Piping 1) Flaring work • Carry out flaring work using flaring tool as shown below. Main cause for refrigerant leakage is due to defect in the flaring Outside diameter work. Carry out correct flaring work using the following procedure. inch Ø6.35 0~0.5...
  • Page 23 For right rear piping 1. Route the indoor tubing and the drain hose in the 4. Connecting the pipings to the indoor unit and drain direction of rear right. hose to drain pipe. • Align the center of the pipes and sufficiently tighten the flare nut by hand.
  • Page 24 • Bundle the piping and drain hose together by wrap- 6. Connecting the pipings to the indoor unit and the ping them with vinyl tape for enough to cover where drain hose to drain pipe. they fit into the rear piping housing section. •...
  • Page 25 • Wrap the area which accommodates the rear piping 10. Indoor unit installation housing section with vinyl tape. • Remove the spacer. • Ensure that the hooks are properly seated on the Indoor Connection installation plate by moving it left and right. unit piping pipe Vinyl tape...
  • Page 26 3) Connection of the pipes-Outdoor CAUTION • Bad case Following bending type from right to left could cause problem 1. Align the center of the pipings and sufficiently of pipe damage. tighten the flare nut by hand. 2. Finally, tighten the flare nut with torque wrench until the wrench clicks.

  • Page 27: Connecting The Cable Between Indoor Unit And Outdoor Unit

    3. Connecting The Cable Between Indoor Unit and Outdoor Unit 1) Connect the cable to the Indoor unit. • Connect the cable to the indoor unit by connecting the wires to the terminals on the control board in dividually according to the outdoor unit connection. (Ensure that the color of the wires of the outdoor unit and the terminal No.
  • Page 28 2) Connect the cable to the outdoor unit Outdoor Unit 1. Remove the control cover from the unit by loos- Terminal block ening the screw. Connect the wires to the terminals on the control Over 5mm board individually. 2. Secure the cable onto the control board with the Connecting cable cord clamp.

  • Page 29: Checking The Drainage And Forming The Pipings

    4. Checking the Drainage and Forming the Pipings 1) Checking the drainage 2) Form the piping 1. To remove the front panel from the indoor unit. 1. Form the piping by wrapping the connecting por- • Set the air direction louvers up-and-down to the posi- tion of the indoor unit with insulation material and tion(horizontally) by hand.

  • Page 30: Air Purging

    5. Air Purging 1) Air purging • Do a leak test of all joints of the tubing(both indoor and outdoor) and both gas and liquid side service Air and moisture remaining in the refrigerant system valves. have undesirable effects as indicated below. Bubbles indicate a leak.
  • Page 31 Soap water method Gas side (1) Remove the caps from the 2-way and 3-way valves. (2) Remove the service-port cap from the 3-way valve. (3) To open the 2-way valve turn the valve stem coun- terclockwise approximately 90°, wait for about 2~3 sec, and close it.

  • Page 32: Test Running

    6. Test Running 1. Check that all tubing and wiring have been properly connected. Intake temperature 2. Check that the gas and liquid side service valves are fully open. Discharge air 1. Prepare remote control 1. Remove the battery cover by pulling it according to the Discharge arrow direction.

  • Page 33: Operation

    Operation Name and Function-Remote Control The remote control transmits the signals to the system. START/STOP BUTTON Signal transmitter Operation starts when this button is pressed and stops when the button is pressed again. OPERATION MODE SELECTION BUTTON Used to select the operation mode. ROOM TEMPERATURE SETTING BUTTONS Used to select the room temperature.

  • Page 34: 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. • Hold up Inlet Grille Horizentally. •...
  • Page 35 2. To remove the Control Box. • Remove securing screws. • Pull the control box out from the chassis careful- 3. To remove the Discharge Grille. • Unhook the discharge grille and pull the dis- charge grille out from the chassis carefully. 4.
  • Page 36 • 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 Motor Cover • Remove 2 securing screw. •...

  • Page 37: 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 38 1. Air purging (Only R-22 Model) 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 39: 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 40 3. 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 41 4. 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 (3) Open the valve (Lo side) on the charge set and discharge the refrigerant until the gauge (1) Confirm that both the 2-way and 3-way valves indicates 0 kg/cm are set to the back seat.
  • Page 42 5. Evacuation 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 CAUTION center hose Use vacuum pump equipped with check value applied to be prevented from flowing backward.

  • Page 43: Gas Charging

    6. Gas Charging (After Evacuation) Liquid side Indoor unit Outdoor unit Open 2-Way valve Gas side Open 3-Way valve Check valve Charging cylinder R-410A OPEN CLOSE • Procedure (1) Connect the charge hose to the charging CAUTION cylinder. This is different from previous procedures. –...
  • Page 44 7. Additional gas charging (Gas leakage) • When refrigerant is insufficient by leakage, recharge the unit with the refrigerant up to normal operating suction pressure. • Use the graph or the equation below to get operating suction pressure according to indoor and outdoor temperature.

  • Page 45: 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 46: 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 47 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 48 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 49: 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 58 of Micom, and the part for driving TRIAC(the input and output signal of IC01M, PIN NO 7, 10) •...
  • Page 50 5. When up/down Vertical Louver does not operate. • Confirm that the up/down Vertical Louver is normally geared with the shaft of Stepping Motor. • If the regular torque is detected when rotating the up/down Vertical Louver with hands Normal •...
  • Page 51 6. When left/right Vertical Louver does not operate. • Confirm that the left/right Vertical Louver is normally geared with the shaft of Stepping Motor. • If the regular torque is detected when rotating the left/right Vertical Louver with hands Normal •...
  • Page 52 7. When Inlet Grille does not operate. • Confirm that the Inlet Grille is normally geared with the shaft of Stepping Motor. • If the regular torque is detected when moving the Inlet Grille with hands Normal • Check the connecting condition of CN-SUC Connector •...
  • Page 53 8. 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 54 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. -54-...

  • Page 55: Electronic Control Device

    Electronic Control Device (1) MAIN P.W.B ASSEMBLY (AC PART) LS-135GB/GM/GR, LS-1351GB/GM/GR • TOP VIEW (1) MAIN P.W.B ASM (AC) • BOTTOM VIEW -55-...
  • Page 56 LS-1352GB/GC/GD/GM/GR/GW, LS-1202GB/GC/GD/GM/GR/GW LS-1262GB/GC/GD/GR/GW, C142CM/CR • TOP VIEW RY-COMP RY-COMP CN-TAB1 CN-TAB3 CN-L/R(BL) CN-U/D(WH) R01J CN-TAB1 CN-TAB3 C01J CN-L/R(BL) CN-U/D(WH) R01J ZNR01J C01J C03J ZNR01J C03J JS03 BZ01E NF01J JS03 BZ01E PWB: 6870A90177D NF01J PWB ASM: 6871A10056 CN-4WAY/FAN/O2 C02J TR01J C04D PWB: 6870A90177D PWB: 6870A90177D C01E...
  • Page 57 (2) DISPLAY ASSEMBLY – 6302A90003A • TOP VIEW SEJIN ELECTRON INC. SVM-GP1119AI P/N 3210018043 REV1 • BOTTOM VIEW – 6871A20463 -57-...
  • Page 58 (3) SUB P.W.B ASSEMBLY – 6871A20259 – 6871A20258 • TOP VIEW • BOTTOM VIEW -58-...

  • Page 59: Schematic Diagram

    Schematic Diagram BZ FREQ -59-...

  • Page 60: Exploded View And Replacement Parts List

    Exploded View and Replacement Parts List 1. Indoor Unit 135312 146811 159830 152302 668713 146811 145200 668713 263020 237900 135080 733010 267110 359011 342800 354210 131410 352150 346810 249951 35211B 146811 159901 135311 135516 -60-...
  • Page 61 Parts List(Indoor) PART No. LOCATION DESCRIPTION REMARKS LSN135G* LSN1351G* 131410 CHASSIS ASSEMBLY 3141A20007B 3141A20007B 135080 DECORATION (TOP) 3508A20034A 3508A20034E 135080 DECORATION (BOTTOM) 3508A20034B 3508A20034F 135311 GRILLE ASSEMBLY, DISCHARGE 3531A10137B 3531A10137E 135314 GRILLE ASSEMBLY, INLET MIRROR 3531A20118E 3531A20118E BLUE 3531A20138X 3531A21010B METAL 3531A20138Y 3531A21010A...
  • Page 62 PART No. LOCATION DESCRIPTION REMARKS LSN1352G* LSN1202G* LSN1262G* 131410 CHASSIS ASSEMBLY 3141A20007B 3141A20009B 3141A20007B 135311 GRILLE ASSEMBLY,DISCHARGE(INDOOR) 3531A10137E 3531A20184B 3531A10137E 135312 GRILLE ASSEMBLY,FRONT(INDOOR) MIRRIOR 3531A20284V 3531A20287V 3531A20284V BLUE 3531A20284T 3531A20287T 3531A20284T WHITE 3531A20284X 3531A20287X 3531A20284X WOOD 3531A20284U 3531A20287U 3531A20284U METAL 3531A20284W 3531A20287W CHERRY 3531A20284Y 3531A20287Y 3531A20284Y...
  • Page 63 PART No. LOCATION DESCRIPTION REMARKS C142CR. NU1 C142CM.NU1 131410 CHASSIS ASSEMBLY 3141A20007B 3141A20007B 135311 GRILLE ASSEMBLY,DISCHARGE(INDOOR) 3531A10137B 3531A10137B 135312 GRILLE ASSEMBLY,FRONT(INDOOR) MIRRIOR 3531A20284Q 3531A20284R METAL 135314 GRILLE ASSEMBLY,INLET MIRRIOR METAL 3531A20285E 3531A20285A 145200 LINK 4520A20008A 4520A20008A 146811 MOTOR ASSEMBLY,STEP 4681A20055A 4681A20055A 146811 MOTOR ASSEMBLY,STEP...
  • Page 64 2. Outdoor unit 437210 435301 437212 554031 435511 546810 552102-2 559010 649950 552201 552111 552102-1 552116 W0CZZ 552202 567502 561410 554160 447910 550140 552203-1 430410 552203-2 -64-...
  • Page 65 Parts List(Outdoor) PART No. LOCATION DESCRIPTION REMARKS LSU135G* LSU1351G* 430410 BASE ASSEMBLY, OUTDOOR 3041AR2205C 3041AR2205C 435511 COVER ASSEMBLY, CONTROL 3550AR2620P 3550AR2620P 437210 PANEL ASSEMBLY, FRONT 3721AR2658E 3721AR2658E 437212 PANEL ASSEMBLY REAR 3721AR2734B 3721AR2734B 447910 BARRIER ASSEMBLY, OUTDOOR 546810 MOTOR ASSEMBLY, OUTDOOR 4681AR1392H 4681AR1392H 550140...
  • Page 66 PART No. LOCATION DESCRIPTION REMARKS LSU1352G* LSU1202G* LSU1262G* 430410 BASE ASSY,OUTDOOR 3041AR2205C 3041AR2205C 3041AR2205C 435511 COVER ASSEMBLY,CONTROL(OUTDOOR) 3550AR2620P 3550AR2620P 3550AR2620P 437210 PANEL ASSEMBLY,FRONT SUB 3721AR2658E 3721AR2658E 3721AR2658E 437212 PANEL ASSEMBLY,REAR(OUTDOOR) 3721AR2734B 3721AR2734B 3721AR2734B 546810 MOTOR ASSEMBLY,OUTDOOR 4681AR1392H 4681AR1392H 4681AR1392H 550140 ISOLATOR,COMP 4H00982E 4H00982E...
  • Page 67 PART No. LOCATION DESCRIPTION REMARKS C142CR. UU1 C142CM. UU1 430410 BASE ASSY,OUTDOOR 3041AR2205C 3041AR2205C 435511 COVER ASSEMBLY,CONTROL(OUTDOOR) 3550AR2620P 3550AR2620P 437210 PANEL ASSEMBLY,FRONT SUB 3721AR2658E 3721AR2658E 437212 PANEL ASSEMBLY,REAR(OUTDOOR) 3721AR2734B 3721AR2734B 546810 MOTOR ASSEMBLY,OUTDOOR 4681AR1392H 4681AR1392H 550140 ISOLATOR,COMP 4H00982E 4H00982E 552102 TUBE,CAPILLARY BEND 5210A20595X 5210A20595X...
  • Page 68 P/No.: 3828A30114B Printed in Korea...

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