LG LS-J0761CL Service Manual
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LG LS-J0761CL Service Manual

LG LS-J0761CL Service Manual

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Room Air Conditioner
SERVICE MANUAL
MODEL : LS-J0761CL / CM / CN / CD / CS
LS-J0761HL / HM / HN / HD / HS
LS-J0962CL / CM / CN / CD / CS
LS-J0962HL / HM / HN / HD / HS
LS-J0963CL / CM / CN / CD / CS
LS-J0821CL / CM / CN / CD / CS

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Summary of Contents for LG LS-J0761CL

  • Page 1 Room Air Conditioner SERVICE MANUAL MODEL : LS-J0761CL / CM / CN / CD / CS LS-J0761HL / HM / HN / HD / HS LS-J0962CL / CM / CN / CD / CS LS-J0962HL / HM / HN / HD / HS...

  • Page 2: Table Of Contents

    Contents Functions ..........................3 Product Specifications (Cooling Only) .................. 5 Product Specification (Cooling & Heating) ................6 Dimensions ..........................7 Refrigeration Cycle Diagram ....................10 Wiring Diagram ........................11 Operation Details ........................13 Display Function ........................20 Self-diagnosis Function ......................20 Installation ..........................
  • Page 3 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 Operation ON/OFF Operation Mode Selection Cooling Operation Mode.( Auto Operation Mode.( (Cooling (Heating Soft Dry 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 Down to 18°C Down to 16°C...
  • Page 5 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 6 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 7 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 8 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 9 2) Connection of Pipings Installation plate 1. Remove the installation plate • Pull the two '∆' marked portion of bottom of the chassis and pull the installation plate out of chas- sis. Pull Pull 2. Route the drain hose and the indoor tubing. For right rear piping 3.
  • Page 10 5. Bend the tubing as shown in the figure and bind the piping, the connecting cables and the drain hose altogether. Conecting • Make a small loop for easy connection later. Gas side cable piping Liquid side piping 6. Wrap the tubing, the drain hose and the con- Drain hose necting cable with tape.
  • Page 11 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 pipe into the chassis.
  • Page 12 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 13 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 14 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 Terminal block board individually as the following. (Pillar terminal) Connecting 1) Cooling only type cable Holder for Over...
  • Page 15 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 16 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 17 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, Taping the end of the drain-outlet should be off the Drain hose ground.(Do not dip it into water, and fix it on the wall to avoid swinging in the wind.)
  • Page 18 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 Gas side compressor. 1. Remove the caps from the 2-way and 3-way valves.
  • Page 19 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 20 6. Pipe length and the elevation Max. Max. Piping Additional Refrig- Capacity Standard Elevation Length erant Length(m) (Btu/h) (g/m) £ (m) £ (m) 7~12K Indoor unit Indoor unit Oil trap Outdoor unit Outdoor unit In case more than 5m CAUTION •...
  • Page 21 7. Test running 1) Connection of power supply 1. Connect the power supply cord to the inde- Battery Cover pendent power supply. • Circuitbreaker is required. 2. Prepare the remote controller. • Insert two batteries provided. Remove the battery cover from the remote con- troller.
  • Page 22 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 23 (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 24 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 25 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 26 • 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 27 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 28 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 29 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 30 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 31 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 32 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 33 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 34 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 35 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 36 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 37 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 38 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 2, 15) •...
  • Page 39 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 40 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 41 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 42 Electronic Control Device (1) MAIN P.C.B ASM PCB ASS'Y SVC PART LIST OPTIONAL FUNCTION MODEL P/NO OR1H OR2H OR3H OR4H OR5H OR6H LS-J0761CL 6871A20055K 6.8K OPEN 6.8K 6.8K LS-J0761HL 6871A20055J 200K 6.8K 6.8K LS-J0962CL 6871A20055M 6.8K OPEN LS-J0963CL LS-J0962HL 6871A20055L...
  • Page 43 (2) Display Ass'y • LS-J0761CL/HL, LS-J0962CL/HL(P/NO.:6871A30009C) -58-...
  • Page 44 Schematic Diagram Cooling Only Series -59-...
  • Page 45 Heat Pump Series -60-...
  • Page 46 Exploded View & Replacement Parts List 1. Indoor Unit (1) LS-J0761CL/HL, LS-J0962CL/HL, LS-J0963CL, LS-J0821CL -61-...
  • Page 47 Parts List (LS-J0761CL/HL, LS-J0962CL/HL) Q/TY PART NO. PART NAME REMARKS LS-J0962CL LS-J0761CL LS-J0761HL LS-J0962HL LS-J0821CL LS-J0963CL 3300A10002A PLATE INSTALLATION 3H03651A HOLDER, TUBE 4681A20003C MOTOR, BLOWER 3141A20001B CHASSIS ASM 5901AR6141A CROSS FLOW FAN 3H02821B BEARING ASM 5421AR6176 EVAPORATOR ASM 5421AR6175 EVAPORATOR...
  • Page 48 2. Outdoor unit LS-J0761CL/HL, LS-J0962CL, LS-J0963CL, LS-J0821CL -63-...
  • Page 49 Parts List (LS-J0761CL/HL, LS-J0962CL) PART No. LS-J0761CL LS-J0761HL LS-J0962CL LS-J0963CL LS-J0821CL REMARK PART NAME 3040AR2415 BASE PAN W.ASM 4810AR1287A MOTOR BRACKET 4681A20004 MOTOR, FAN 5900AR1266A 1WPA0600014 PLAIN WASHER 4H02861A FAN NUT 4908AR2417C SUPPORT VALVE 5403AR2475 CONDENSER ASM 5403AR2870 5416A20004 COMPRESSOR ASM...

  • Page 50: Functions

    3. Outdoor unit LS-J0962HL -65-...
  • Page 51 Parts List (LS-J0962HL) PART NAME PART No. LS-J0962HL REMARK 3041A20008 BASE PAN W.ASM 4960A10002A MOTOR BRACKET 4681A20004 MOTOR,FAN 5901A10004A 1WPA0600014 PLAIN WASHER 4H02861A FAN NUT 4908A20006B SUPPORT VALVE 5403A20028 CONDENSER ASM 5417A20012C COMPRESSOR ASM 4H00982E ANTI VIBRATION 4810AR4155 WASHER 1NHA0801206 HEXAGON NUTS(D8.0) 2H02479 SERVICE VALVE(1/4".H4)

  • Page 52: Product Specifications (Cooling Only)

    Product Specifications (Cooling Only) Model Name LS-J0761CL LS-J0962CL LS-J0821CL LS-J0963CL Item Unit Cooling Capacity Btu/h 7,000 9,000 8,000 9,000 Moisture Removal Power Source Ø, V, Hz 1Ø, 220-240V, 50Hz 1ø 220V, 60Hz 1Ø, 220-240V, 50Hz Indoor Air Circulation /min Outdoor...

  • Page 53: Product Specification (Cooling & Heating)

    Product Specifications (Cooling & Heating) Model Name LS-J0761HL LS-J0962HL Item Unit Cooling Capacity 7,000 9,000 Btu/h Heating Capacity 7,300 9,300 Moisture Removal Power Source Ø, V, Hz 1Ø, 220-240V, 50Hz Indoor Air Circulation /min Outdoor Indoor Noise Level dB (A)¡ 3 Outdoor Cooling Input...

  • Page 54: Dimensions

    Dimensions (1) Indoor Unit Installation plate Tubing hole cover Left rear piping Right rear piping 80mm ø70mm ø70mm 50mm LS-J0761CL/HL MODEL LS-J0821CL LS-J0962CL/HL LS-J0963CL Unit...
  • Page 55 (2) Outdoor Unit (7K, 9K) Gas side (3-way valve) Liquid side (2-way valve) LS-J0761CL/HL MODEL LS-J0821CL LS-J0962CL LS-J0963CL unit...
  • Page 56 (3) Outdoor Unit (LS-J0962HL) Gas side (3-way valve) Liquid side (2-way valve) MODEL 9K Btu Heat Pump unit...

  • Page 57: 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 58: Wiring Diagram

    Indoor Unit POWER FORCED MAIN PCB OPERATION AUTO RESTART Indoor unit Model Outdoor unit TRIAC REMOTE CONTROL MOTOR LS-J0761CL THERMISTOR LS-J0821CL LS-J0962CL STEP LS-J0963CL SH-CAPA. MOTOR RY-COMP. FUSE AC250V/T2A CN-DISP1 PILLAR 1 ( L ) 2 ( N ) TERMINAL...
  • Page 59 (2) 7K, 9K Btu Cooling & Heating Indoor Unit POWER FORCED MAIN PCB OPERATION AUTO Indoor unit Model Outdoor unit RESTART TRIAC REMOTE CONTROL MOTOR LS-J0761HL THERMISTOR LS-J0962HL STEP SH-CAPA. MOTOR FUSE AC250V/T2A RY-COMP. RY-4WAY RY-FAN CN-DISP1 PILLAR 1 ( L ) 2 ( N ) TERMINAL DISPLAY PCB ASM INDOOR WIRING DIAGRAM...

  • Page 60: 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 61 • 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 62 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 63 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 64 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 65 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 66 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 67: 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 •...

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