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LG LS-B0760CM/B0760HM Service Manual
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LG LS-B0760CM/B0760HM Service Manual

LG LS-B0760CM/B0760HM Service Manual

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K
M
Room Air Conditioner
SERVICE MANUAL
MODEL : LS-B0760CM/B0760HM
LS-B0960CM/B0960HM
LS-B0962CM/B0962HM
LS-B0962CD/B0962HD
LS-B0960CD/B0960HD
LS-C1260CM/C1260HM
LS-C1260CD/C1260HD
LS-C1120CM/C1420CM
LS-C1420CN
CAUTION
BEFORE SERVICING THE UNIT,
READ THE "SAFETY PRECAUTIONS" IN THIS MANUAL.
K
M

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Summary of Contents for LG LS-B0760CM/B0760HM

  • Page 1 Room Air Conditioner SERVICE MANUAL MODEL : LS-B0760CM/B0760HM LS-B0960CM/B0960HM LS-B0962CM/B0962HM LS-B0962CD/B0962HD LS-B0960CD/B0960HD LS-C1260CM/C1260HM LS-C1260CD/C1260HD LS-C1120CM/C1420CM LS-C1420CN CAUTION BEFORE SERVICING THE UNIT, READ THE "SAFETY PRECAUTIONS" IN THIS MANUAL.

  • Page 2: Table Of Contents

    Contents Functions ............................3 Product Specifications (Cooling Only) ..................5 Product Specifications (Cooling & Heating) ................6 Dimensions ........................... 7 Maximum Length of Pipe and Freon Extra Charge ..............9 Refrigeration Cycle Diagram ..................... 10 Wiring Diagram .......................... 11 Operation Details ........................13 Display Function ........................

  • 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 seconds at the starting. Time Delay Safety Control •...
  • Page 4 Remote Controller Operation ON/OFF Operation Mode Selection Auto Operation Mode ( Cooling Operation Mode ( Heating Operation Mode ( Soft Dry Operation Mode ( (Cooling model only) (Heatling model only) Fan Speed Selection (Low) (Med) (High) (AUTO WIND) (CHAOS) Room, Temperature Display : High: 39°C LOW : 11°C Temperature Setting...

  • Page 5: Product Specifications (Cooling Only)

    Product Specifications (Cooling Only) Model Name LS-B0960CD LS-B0962CD LS-C1260CD LS-C1420CM LS-C1120CM LS-B0760CM LS-C1260CM LS-B0960CM LS-B0962CM LS-C1420CN Unit Item Cooling Capacity BTU/h(kcal/h) 7,300(1,840) 8,700(2,190) 8,700(2,190) 11,000(2,770) 12,000(3,020) 14,000(3,528) Moisture Removal ℓ/h 1Ø, 220-240V, 50Hz 1Ø, 220V~,60Hz 1Ø, 220-240V,50Hz 1Ø, 220V~,60Hz Power Source Ø, V, Hz Indoor 4.85...

  • Page 6: Product Specifications (Cooling & Heating)

    Product Specifications (Cooling & Heating) Model Name LS-B0960HD LS-B0962HD LS-C1260HD LS-B0760HM LS-B0960HM LS-B0962HM LS-C1260HM Unit Item Cooling Capacity 7,000(1,764) 8,500(2,142) 8,500(2,142) 12,000(3,020) BTU/h(kcal/h) Heating Capacity 7,500(1,890) 9,500(2,394) 9,500(2,394) 12,500(3,150) ℓ/h Moisture Removal Power Source Ø, V, Hz 1Ø, 220-240V, 50Hz Indoor 4.85 10.2...

  • Page 7: Dimensions

    Dimensions (1) Indoor Unit (7K, 9K) (11K, 12K, 14K) Tubing hole cover Tubing hole cover Tubing hole cover Tubing hole cover Installation plate Installation plate 4.5cm Hole for piping Hole for piping MODEL 7K, 9K BTU 11K, 12K, 14K BTU Series Series 220.5...
  • Page 8 (2) Oudoor Unit (7K, 9K, 11K, 12K, 14K) Liquid side 2-way valve Gas side 3-way valve MODEL 7K, 9K, 11K BTU Series 12K, 14K BTU Series 18.5 543.6 11.4 76.5 76.5 72.5 86.4 - 8 -...

  • Page 9: Maximum Length Of Pipe And Freon Extra Charge

    Maximum Length of Pipe and Freon Extra Charge Charge amount per 1m MAXIMUM LENGTH Charge amount (g) Capacity STANDARD (Btu/h) LENGTH(m) per 1m ~7000 ~9000 ~12000 ~18000 30(25) ~24000 Indoor unit Oil trap Outdoor unit * A, B mean indoor unit higher located than outdoor unit * Capicity is based on standard length and maximum allowance length is the basis of relia- bility.

  • Page 10: Refrigeration Cycle Diagram

    Refrigeration Cycle Diagram INDOOR UNIT OUTDOOR UNIT CAPILLARY TUBE LIQUID SIDE 2-WAY VALVE HEAT HEAT EXCHANGE EXCHANGE (EVAPORATOR) (CONDENSER) GAS SIDE REVERSING ACCUMU- 3-WAY VALVE VALVE LATOR COOLING COMPRESSOR HEATING - 10 -...

  • Page 11: Wiring Diagram

    Wiring Diagram (1) 7K, 9K, 11K, 12K, 14K BTU Cooling Only 1. Indoor Unit (7K, 9K, 12K) (11K, 14K) FORCED FORCED TRANS OPERATION TRANS OPERATION FORMER SWITCH SWITCH FORMER CN-TRANS RY-L RY-M MOTOR RY-H CN-TH BR BL THERMISTOR THERMISTOR SH-CAPA STEP FUSE T2A MOTOR...
  • Page 12 (2) 7K, 9K, 12K BTU Cooling & Heating 1. Indoor Unit FORCED TRANS OPERATION FORMER SWITCH CN-TRANS THERMISTOR STEP MOTOR RY-COMP CN-4WAY MAIN PCB RY-4WAY CN-DISP RY-FAN PILLAR TERMINAL DISPLAY PCB ASM INDOOR WIRING DIAGRAM TO OUTDOOR UNIT 2. Outdoor Unit MOTOR PILLAR TERMINAL...

  • Page 13: 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) • 2sec ... The indoor fan is ceased for 2sec. to prevent relay noise. (Protection of fan relay and micro chip) •...
  • Page 14 • Cooling Mode with the Sleep Mode The setting temperature will be raised by 1°C 30minutes later and by 2°C 1 hour later. The operation will be stopped after 1, 2, 3, 4, 5, 6, 7 hours. 30 minutes 30 minutes Intake Air temp.
  • Page 15 5. Auto Operation • The operation procedure is as following. Press Start/Stop Button Select Auto Operation Mode Check the Room temperature Operation mode Indoor fan speed are automatically decided by Fuzzy rule. Setting temperature Intake-air Over below Over 24°C below 21°C temperature 21°C 24°C...
  • Page 16 Auto Operation for Soft Dry The Setting temperature will be same that of the current intake-air temperature. - Compressor ON temperature; Setting temperature +1°C - Compressor OFF temperature; Setting temperature -0.5°C Auto Operation for Heating Intake Air temp. below 20°C Over 20°C~below 21°C Setting temp.
  • Page 17 6.Heating Mode Operation The unit will operate according to the setting by the remote controller and the operation diagram is shown as fol- lowing. For 9K, 12K Models Intake Air temp. Setting temp. +3°C (Compressor OFF) Setting temp. (Compressor ON) minimum minimum minimum...
  • Page 18 8. Deice Control • Deicing operation is controlled by timer and sensing the indoor pipe temperature. • Deicing operation checks the indoor pipe temperature and Intake-air temperature at 25 minutes and 60 minutes on starting of heating operation, and discriminates by temperature difference. •...
  • Page 19 9. Soft Dry Operation. • During Soft Dry Operation, the compressor ON temperature is the setting temperature plus 1°C, the compressor OFF temperature is the setting temperature minus 0.5°C. • When the room temperature rises over the compressor ON temperature, the operation mode is switched to the cooling mode.

  • Page 20: Display Function

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

  • Page 21: 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. • There should not be any obstacles to prevent the air More than 5 cm More than circulation.
  • Page 22 2) Indoor Unit Installation The mounting wall should be strong and solid enough to prevent it from the vibration. Installation Plate 1. Mount the installation plate on the wall with four Type "A" screws. • Always mount the Installation plate horizontally by aligning the marking-off line with using the thread and a level.
  • Page 23 2. Piping and Drainage of Indoor Unit 1) Preparation of pipings Pipe cutter 1. Cut the pipes and the cable. • Use the accessory piping kit or the pipes purchased locally. Slanted Rough 90° • Measure the distance between the indoor and the outdoor unit.
  • Page 24 2) Connection of Pipings (7K,9K BTU) 1. Remove the installation plate. Installation Plate • Pull the two ' 'marked portion of bottom of the chassis and pull the installation plate out of chassis. 2. Route the drain hose and the indoor tubing. Pull Pull For right rear piping...
  • Page 25 5. Bend the tubing as shown in the figure and bind the pipings, 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.
  • Page 26 For left rear pipings 3. Insert the connecting cables, the drain pipe and connecting pipings through the piping hole on the wall. Drain hose Outdoor Indoor Connecting cable Connecting piping Drain pipe 4. Connect connecting pipings and indoor tubing, and the drain hose and the drain pipe and place the drain pipe into the chassis.
  • Page 27 6. Wrap the insulation material around the con- necting portion. Insulation material Plastic Bands CAUTION: Take care to arrange the pipings, drain hose and cables as the feature on page 6 for inserting it into the indoor unit and mount the indoor unit on the installation plate.
  • Page 28 3) Connection of Pipings(11K,12K, 14K BTU) 2. Refix the tubing holder into original position. 1. Remove the indoor tubing with Drain hose to the hole • Remove tubing holder and pull the tubing out of the chassis. Tubing holder 11K, 12K, 14K Series •...
  • Page 29 6. Indoor unit installation. • Hook the indoor unit onto the upper portion of installation plate. (Engage the two hooks of the rear top of the indoor unit with the upper edge of the Connecting cable installation plate.) Ensure the hooks are properly seated on the instal- lation plate by moving it in left and right.
  • Page 30 For the left pipings 3. Route the indoor tubing with the drain hose to the piping hole as desired position. Tubing holder 12K Series • To remove the holder, press the bottom of chassis near the holder upward ad the tab is Pull clear of its hole.
  • Page 31 7. Indoor unit installation. • Hook the indoor unit onto the upper portion of installation plate. (Engage the two hooks of the rear top of the indor unit with the upper edge of Connecting cable the installation plate.) Ensure the hooks are properly seated on the installation plate by moving it in left and right.
  • Page 32 10. Set the pipings and the connecting cable to the back of the chassis with the tubing holder. 11K, 12K, 14K Series Connecting piping Drain hose Taping Tubing holder Piping Turn 90° Press 11. Indoor unit installation. • Hook the indoor unit onto the upper portion of installation plate.
  • Page 33 3. Connecting Pipings and the cable to Outdoor unit 1) Connecting the piping to the Outdoor unit 1. Align the center of the pipings and sufficiently tighten the flare nut with fingers. 2. Finally, tighten the flare nut with torque wrench until the wrench clicks.
  • Page 34 4. Checking the Drainage and Pipe forming 1) Checking the Drainage 1. Remove the Grille from the cabinet. • Set the up-and-down air direction louver to open position (horizontally) by finger pressure. • Remove the securing screws. • To remove the Grille, pull lower the left and right side of the grille toward you (slightly tilted) and lift it straight upward.
  • Page 35 3. Attach the Grille onto the cabinet. • Grasp lower the left and right side of the Grille and engage two tabs on the top in side edge of the grille with two slots on the cabinet's top front edge. •...
  • Page 36 5. Air Purging 1) Air purging Terminal block The air remaining which contains moisture in the (pillar terminal) refrigeration cycle may cause a malfunction on the Cover control compressor. 1. Remove the caps from the 2-way and 3-way valves. 2. Remove the service-port cap from the 3-way valve.
  • Page 37 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 38 6. Test running 1) Connection of power supply 1. Connect the power supply cord to the inde- pendent power supply. RESET • Circuitbreaker is required. 2. Prepare the remote controller. • Insert two batteries provided. Remove the battery cover from the remote controller.

  • Page 39: Operation

    Operation (1) Name and Function-Remote Control 1) Cooling Model Remote Controller Operation display Displays the operation conditions. Signal trasmitter Start/Stop Button Operation starts when this button is pressed, and Transmits the signals stops when the button is pressed again. to the room air conditioner. Operation Mode Selection Button Used to select the operation mode.
  • Page 40 2) Heating Model Operation display Displays the operation conditions. Remote Controller Start/Stop Button Signal trasmitter Operation starts when this button is pressed, and stops when the button is pressed again. Operation Mode Selection Button Transmits the signals to the room air conditioner. Used to select the operation mode.

  • Page 41: 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 Up-and-down air direction louver position (horizontally) by finger pressure.
  • Page 42 2. To remove the Control Box • Remove 2 or 4 securing screws. • Pull the control box out from the chassis carefully. 3. To remove the Discharge Grille. • Remove the securing screw. • Pull the discharge grille out from the chassis care- fully.
  • Page 43 • Unhook the tab on the left inside edge of the chassis by pressing it outwards and at the same time, slightly pull the evaporator until the tab is clear of the end-plate. • Remove the evaporator from the chassis carefully. •...

  • Page 44: 2-Way, 3-Way Valve

    2-way, 3-way Valve 2-way Valve (Liguid Side) 3-way Valve (Gas Side) Valve cap Hexagonal wrench Open position Flare nut (4mm) Closed position Flare nut Open position Closed position piping piping Service connection connection Service port port cap To outdoor unit To outdoor unit Works Shaft position...
  • Page 45 1. Air purging Required tools: Hexagonal wrench, adjustable wrench, The air in the indoor unit and in the piping must be torque wrenches, wrench to hold the purged. If air remains in the refrigeration pipes, it will joints, and gas leak detector. affect the compressor, reduce to cooling capacity, and could lead to a malfunction.
  • Page 46 2. Pumping down Liquid side Indoor unit Outdoor unit Open 2-Way valve Gas side Closed 3-Way valve Manifold Gauge CLOSE OPEN CLOSE (Low handle (High handle) Purge the air • Procedure (1) Confirm that both the 2-way and 3-way valves are (6) Operate the air conditioner at the cooling cycle and set to the open position.
  • Page 47 1) Re-air purging (Re-installation) Liquid side Indoor unit Outdoor unit Closed 2-Way valve Gas side Closed 3-Way valve Gas cylinder Manifold Gauge CLOSE R-22 OPEN (High handle) (Low handle) • Procedure (6) Disconnect the charge set and the gas cylinder, (1) Confirm that both the 2-way valve and the 3-way and set the 2-way and 3-way valves to the open valve are set to the closed position.
  • Page 48 2) Balance refrigerant of the 2-way, 3-way valves (Gas leakage) Liquid side Indoor unit Outdoor unit Open 2-Way valve Gas side Open 3-Way valve Manifold Gauge OPEN (Low handle) CLOSE (High handle) • Procedure (1) Confirm that both the 2-way and 3-way valves are (3) Open the valve (Low handle) on the charge set and set to the back seat.
  • Page 49 3. Evacuation (All amount of refrigerant leaked) Liquid side Indoor unit Outdoor unit Open 2-Way valve Gas side Open 3-Way valve Vacuum pump Manifold Gauge OPEN CLOSE (Low handle) (High handle) • Procedure (1) Connect the vacuum pump to the charge set's cen- ter hose (2) Evacuation for approximately one hour.
  • Page 50 4. Gas Charging (After Evacuation) Liquid side Indoor unit Outdoor unit Open 2-Way valve Gas side Open 3-Way valve Check valve Charging cylinder Manifold Gauge OPEN CLOSE (Low handle) (High handle) • Procedure (1) Connect the charge hose to the charging cylinder. This is different from previous procedures.

  • Page 51: 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 Temp.

  • Page 52: Electronic Parts Troubleshooting Guide

    Electronic Parts Troubleshooting Guide Possible Trouble 1 : The unit does not operate. Check the fuse check Is the trans input power the wiring diagram. AC240V? Is the trans Is shorted the Check the main output power about trans output? P.C.B pattern.
  • Page 53 Possible Trouble 2 : Fan does not operate. Does the temperature Is it the DRY Mode? Adjust setting temp. set all right? Does the temperature Adjust setting temp. Is it the HOT Mode? set all right? Check the FAN Motor Does the temperature and Connector set all right?
  • Page 54 Possible Trouble 3 : Up/Down Air direction louver does not operate. Is the IC7 O.K? Exchange the IC7 Is the voltage Check the P.C.B of CN-UP/DOWN NO DC12V pattern 1DC12V? Check the step motor and Connector (CN-UP/DOWN) Possible Trouble 4 : Remote controller does not operate.
  • Page 55 Possible Trouble 5 : Ineffective Heating Check and Exchange Does 4-way operate? IC3, RY1 Check P.C.B pattern Check Voltage of IC8 1pin (to IC1 42pin) (DC 5V?) Check Voltage of IC8 Check and Exchange IC8 16pin (0V?) Check the RY-4way and 4way VALVE Possible Trouble 6 : It does not operate forced operation.

  • Page 56: Electronic Control Device

    Electronic Control Device (1) MAIN P.C.B ASM : 7K, 9K, 11K, 12K, 14K BTU Cooling Only Series 250V/T2A 125V/2A P.C.B ASM P/NO. 7K, 9K 6871AQ2146E 11K, 12K, 14K 6871AQ2146B LS-C1420CN 6871AQ2146W - 56 -...
  • Page 57 (2) MAIN P.C.B ASM : 7K, 9K, 12K BTU Cooling & Heating Series 250V/T2A 125V/2A P.C.B ASM P/NO. 7K, 9K 6871AQ2146D 4871AQ2146A - 57 -...
  • Page 58 (3) DISPLAY P.C.B ASM (7K, 9K BTU Series) 6047AQ3029C 1 CN-MAIN 7 REMOCON RECIVER (11K, 12K, 14K BTU Series) RECEIVER - 58 -...

  • Page 59: Schematic Diagram

    Schematic Diagram 7K, 9K, 11K, 12K, 14K BTU Cooling Only Series - 59 -...
  • Page 60 7K, 9K, 12K BTU Cooling & Heating Series - 60 -...

  • Page 61: Exploded View & Replacement Parts List

    Exploded View & Replacement Parts List 1. Indoor Unit (7K, 9K BTU series) - 61 -...
  • Page 62 Parts List (7K, 9K, Indoor Unit) Q,TY PARTS NAME PART No. LS-B0960CD LS-B0962CD LS-B0960HD LS-B0962HD REMARK LS-B0760CM LS-B0760HM LS-B0960CM LS-B0962CM LS-B0960HM LS-B0962HM PLATE INSTALLATION 3300AR1008A HOLDER, TUBE 4930AR3015A MOTOR BLOWER 4680AR2033 CHASSIS ASM 3141AR2466A BLOWER ASS'Y 5835AR2034A BEARING ASM 3H02821A EVAPORATOR ASS'Y 5421AR2035 TUBE ASS'Y...
  • Page 63 2. Outdoor Unit (7K, 9K, 11K BTU series) - 63 -...
  • Page 64 Parts List (7K, 9K, 11K Outdoor Unit) Q,TY PART NO. PART NAME LS-B0960CD LS-B0962CD LS-B0960HD LS-B0962HD MARKS LS-B0760CM LS-B0962CM LS-C1120CM LS-B0760HM LS-B0960CM LS-B0960HM LS-B0962HM 2H02435B BASE PAN WELD ASM 1H00838A MOUNT, MOTOR 1H00853 MOTOR, FAN 5900AR1119A FAN 1WPA0600014 PLAIN WASHER 4H02861A FAN NUT 4A01405C...
  • Page 65 Q,TY PART NO PART NAME. LS-B0960CD LS-B0962CD LS-B0960HD LS-B0962HD MARKS LS-B0760CM LS-B0962CM LS-C1120CM LS-B0760HM LS-B0960CM LS-B0960HM LS-B0962HM 3H03168A HANDLE 30 5210AR2135A TUBE DISCHARGE 5210AR2482 5211AR2428 2H02444C 31 5210AR2136A TUBE SUCTION 5210AR2481A 5210AR2429A 5210AR3418D 2H02385F COVER GRILLE 3H00390 TERMINAL BLOCK 3A02028G COIL, REVERSING 5220AR3084A VALVE, REVERSING...
  • Page 66 3. Indoor Unit (11K, 12K, 14K BTU Series) - 66 -...
  • Page 67 Parts List (11K, 12K, 14K Indoor Unit) Q,TY PART NO. PART NAME REMARKS LS-C1420CM LS-C1260CM LS-C1260HD LS-C1120CM (LS-C1420CN) LS-C1260CD LS-C1260HM 1H00843A PLATE INSTALLING 3H03651A HOLDER, TUBE 4680AR2385 MOTOR, BLOWER 3141AR2261A CHASSIS ASM 3H03652A COVER, TUBE 2H02426A CROSS FLOW FAN 3H02821A BEARING ASM 5420AR2407A EVAPORATOR...
  • Page 68 4. Outdoor Unit (12K, 14K BTU Series) - 68 -...
  • Page 69 Parts List (12K, 14K Outdoor Unit) Q,TY PARTS NAME PART No. REMARK LS-C1260CD LS-C1260HD LS-C1420CM LS-C1260CM LS-C1260HM (LS-C1420CN) BASE PAN W. ASM 2H02079 COMPRESSOR 5417AR2256A 5416AR2300 2H02466L O.L.P 6750-CL005A (OVER LOAD PROTECTOR) 6750U-L017 TERMINAL COVER 3550-CL001C 3550U-L002D NUT TERMINAL COVER 4H00947A ANTI VIBRATION BUSH 4H00982A...
  • Page 70 Q,TY PARTS NAME PART No. REMARK LS-C1420CM LS-C1260CD LS-C1260HD LS-C1260CM (LS-C1420CN) LS-C1260HM BARRIER ASM 3H03466A COVER GRILLE 2H02385 1F(1D) REAR PANEL 1H00697C TOP COVER ASM 3H03465A COVER CONTROL ASM 2H02082A HANDLE 3H03168A - 70 -...
  • Page 71 P/NO : 3828AR7036F Printed in Korea...

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