LG Room Air Conditioner SERVICE MANUAL MODELS: AS-H076QGA2/QNA2 AS-H096QGA2/QNA2 AS-H126RGA2/RNA2 LS-C096QLA2 LS-H096QLA2 LS-C126RLA2 LS-H126RGA2/RMA2/RLA2 CAUTION • BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. • ONLY FOR AUTHORIZED SERVICE PERSONNEL.
Air Conditioner Service Manual TABLE OF CONTENTS LG Model Name ...............................3 Safety Precautions............................5 Dimensions ..............................10 Symbols Used in this Manual ........................10 Indoor Unit..............................10 Outdoor Unit.............................11 Product Specifications ..........................12 Installation ..............................15 Selection of the Best Location........................15 Piping Length and Elevation........................15 How to Fix Installation Plate ........................16 Drill a Hole in the Wall ..........................16...
LG Model Name 2002 Code Type Code of Model Meaning Type of Airconditioner LS: LG Split Type Airconditioner Chassis Name of toll of Unit Ex. LS-R ➔ S R Chassis Capacity(Btu/h) Cooling/Heating Capacity Ex. "09" ➔ 9,000Btu/h Electric Range Electric Standard 1 ➔...
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Nano Plasma F+(A/changeove)+A/clean+4way Nano Plasma F+(A/changeove)+A/clean+PTC Nano Plasma F+(A/changeove)+Autoclean+4way+PTC Nano Plasma F+(A/changeove)+A/clean+4way+Low A+PTC Negative ION+A/Clean (Nano)Plasma+Negative ION+A/Clean 4way+(Nano)Plasma F+Negative ION+Healthy dehumidification+A/Clean Nano Plasma F+4Way+(A/changeove)+A/clean+ Serial No. LG Model De velopment Serial No. * ARTCOOL COLOR Mirror White Blue Wood Metal Cherry...
Safety Precautions Safety Precautions To prevent injury to the user or other people and property damage, the following instructions must be followed. I Incorrect operation due to ignoring instruction will cause harm or damage. The seriousness is classified by the following indications. This symbol indicates the possibility of death or serious injury.
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Safety Precautions For re-installation of the installed product, Do not install, remove, or re-install the unit by always contact a dealer or an authorized ser- yourself. vice center. • There is risk of fire, electric shock, explosion, or • There is risk of fire, electric shock, explosion, or injury.
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Safety Precautions I Operation Do not turn the air-conditioner ON or OFF by Use a dedicated outlet for this appliance. plugging or unplugging the power plug. • There is risk of fire or electrical shock. • There is risk of fire or electrical shock. Grasp the plug to remove the cord from the Do not place a heater or other appliances near outlet.
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Unplug the unit if strange sounds, odors, or Be cautious that water could not enter the smoke comes from it. product. • There is risk of electric shock or fire. • There is risk of fire, electric shock, or product dam- age.
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I Operation Use a soft cloth to clean. Do not use harsh Do not touch the metal parts of the product detergents, solvents, etc. when removing the air filter. They are very sharp! • There is risk of fire, electric shock, or damage to the •...
Dimensions Dimensions Symbols Used in this Manual This symbol alerts you to the risk of electric shock. This symbol alerts you to hazards that could cause harm to the air conditioner. This symbol indicates special notes. NOTICE Indoor Unit Installation plate Model 7K, 9K Btu Series 12K Btu Series...
Installation Installation Selection of the Best Location Indoor unit More than 60cm • Do not have any heat or steam near the unit. • Select a place where there are no obstacles in More than 10cm More than 10cm front of the unit. •...
Installation How to Fix Installation Plate Drill a Hole in the Wall The wall you select should be strong and solid • Drill the piping hole with a ø70mm hole core drill. enough to prevent vibration Drill the piping hole at either the right or the left with the hole slightly slanted to the outdoor side.
Installation Flaring Work Main cause for refrigerant leakage is due to defect in Flaring work the flaring work. Carry out correct flaring work using the • Firmly hold copper pipe in a die in the dimension following procedure. shown in the table above. Cut the pipes and the cable.
Installation Connection of Piping Indoor • Preparing the indoor unit's piping and drain hose 3. Tape the tubing, drain hose, and the connecting for installation through the wall. cable. Be sure that the drain hose is located at the lowest side of the bundle. Locating at the •...
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Installation • Tighten the flare nut with a wrench. • Wrap the area which accommodates the rear pip- ing housing section with vinyl tape. Open-end wrench (fixed) Indoor Connection unit pipe pipe Flare nut Vinyl tape Wrap with vinyl tape (wide) Wrench Connection pipe...
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Installation 3. Insert the connecting cable into the indoor unit. Outside diameter Torque kg . m • Don't connect the cable to the indoor unit. inch Ø6.35 • Make a small loop with the cable for easy connec- tion later. Ø9.52 Ø12.7 Ø15.88...
Installation • Bundle the piping and drain hose together by Press the lower left and right sides of the unit against the wrapping them with cloth tape over the range with- installation plate until the hooks engage into their in which they fit into the rear piping housing sec- slots(clicking sound).
Installation 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.
Installation Connect the Cable to the Outdoor Unit Outdoor Unit Terminal block 1. Remove the control cover from the unit by loos- ening the screw. Over 5mm Connect the wires to the terminals on the control board individually. Connecting cable 2.
Installation Checking the Drainage Form the Piping 1. To remove the front panel from the indoor unit. 1. Form the piping by wrapping the connecting portion of the indoor unit with insulation materi- • Set the air direction louvers up-and-down to the al and secure it with two kinds of vinyl tapes.
Installation Test Running 1. Check that all tubing and wiring have been properly Intake temperature connected. Discharge air 2. Check that the gas and liquid side service valves are fully open. Prepare remote control 1. Remove the battery cover Discharge by pulling it according to the temperature arrow direction.
Operation Operation Function of Controls • 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) Timer Indicator •...
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 dehumidification operation and 4-min compressor off repeat. ➲ Setting Temp+0.5°C Compressor ON Temp.
Operation I Airflow Speed Selection • The airflow speed of the indoor fan is set to high, medium, low, or chaos (auto) by the input of the airflow speed selection key on the remote control. I Sleep Timer Operation • When the sleep time is reached after <1,2,3,4,5,6,7,0(cancel) hr> is input by the remote control while in appli- ance operation, the operation of the appliance stops.
Operation I Test operation • During the TEST OPERATION, the unit operates in cooling mode at high speed fan, regardless of room tem- perature and resets in 18±1 minutes. • During test operation, if remote controller signal is received, the unit operates as remote controller sets. If you want to use this operation, open the front panel upward and Press the power button let it be pressed for about 3 seconds.
Operation Display Function 1. Heating Model 2. Cooling Model Operation Indicator Operation Indicator • Cooling, Soft Dry, Fan, Heating • Cooling, Soft Dry, Fan Timer Indicator Timer Indicator • Timer Mode • Timer Mode Indoor Unit on Indicator Indoor Unit on Indicator DOOR DOOR Compressor on Indicator...
Disassembly Disassembly 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.
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Disassembly 2. To remove the Control Box. • Remove securing screws. Caution label • 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.
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Disassembly • 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. •...
Schematic Diagram Wiring Diagram Indoor Unit Models: AS-H076QGA2/QNA2, AS-H096QGA2/QNA2, AS-H126RGA2/RNA2, LS-H096QLA2, LS-H126RGA2/RMA2/RLA2 AC PWB ASM. DC PWB ASM. TRIAC THERMISTOR MOTOR GN/YL STEP MOTOR CN-MOTOR STEP SH-CAPA MOTOR T/BOARD CN-TAB T-BLOCK H.V. CLEAN ASM. (PLASMA) S/W1 FUSE RY-COMP 250V T2A...
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Schematic Diagram Outdoor Unit Models: AS-H076QGA2/QNA2, Model: LS-C096QLA2 AS-H096QGA2/QNA2, AS-H126RGA2/RNA2, LS-H096QLA2 CAPACITOR COMP GN/YL MOTOR BR(YL) BL GN/YL PILLAR TERMINAL BL GN/YL BLACK TO INDOOR UNIT 3854AR2262F Model: LS-C126RLA2 Model: LS-H126RGA2/RLA2/RMA2 COMP MOTOR C S R COMP MOTOR C S R...
Troubleshooting Guide Troubleshooting Guide 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) 3-WAY VALVE CAPILLARY TUBE...
Troubleshooting Guide 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...
Troubleshooting Guide 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.
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Troubleshooting Guide Balance Refrigerant of the 3-way Valve (Gas leakage) Liquid side Indoor unit Outdoor unit 3-Way valve Open Gas side 3-Way valve Open OPEN CLOSE • Procedure (1) Confirm that both the 2-way and 3-way valves (3) Open the valve (Lo side) on the charge set and are set to the back seat.
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Troubleshooting Guide Evacuation (All amount of refrigerant leaked) Liquid side Indoor unit Outdoor unit 3-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-...
Troubleshooting Guide Gas Charging (After Evacuation) Liquid side Indoor unit Open Outdoor unit 3-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.
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Troubleshooting Guide Additional gas charging (Gas leakage) • When refrigerant is insufficient by leakage, recharge the unit with the refrigerant up to normal operating suc- tion pressure. • Use the graph or the equation below to get operating suction pressure according to indoor and outdoor tem- perature.
Troubleshooting Guide Cycle Parts 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.
Troubleshooting Guide Electronic Parts 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.
Troubleshooting Guide The product is not operate with the remote controller. 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.
Troubleshooting Guide 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).
Troubleshooting Guide 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 7, 10) •...
Troubleshooting Guide 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 •...
Troubleshooting Guide 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.
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Troubleshooting Guide 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.