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LG Room Air Conditioner SERVICE MANUAL LG MODELS: AS-W096URH0/UBH0/UWH0/UMH0 AS-W126URH0/UBH0/UWH0/UMH0/UCH0 AS-W096URH1/UBH1/UWH1/UMH1 AS-W126URH1/UBH1/UWH1/UMH1 CAUTION website http://www.lgservice.com • BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
2 Room Air Conditioner Air Conditioner Ser vice Manual T ABLE OF CONTENTS LG Model Name ............................................................................................................................................... 3 Safety Precautions .
Ser vice Manual 3 LG Model Name 12 3456789 Code T ype Code of Model Meaning 1,2 T ype of Airconditioner A~Z LS: LG Split T ype Airconditioner 3 Chassis A~Z Name of toll of Unit Ex. LS-R ➔ S R Chassis 4,5 Capacity(Btu/h) 1~9 Cooling/Heating Capacity Ex.
4 Room Air Conditioner 12 - 3456789 1 0 Code T ype Code of Model Meaning 1 Producing Center , A~Z L: Chang-won R22 N: India Refrigerant A: Chang-won R410A Z: Brazil C: Chang-won R407C D: Indonesia T: .
Ser vice Manual 5 Saf ety Precautions Safety Precautions T o pre vent injury to the user or other people and proper ty damage, the f ollowing instructions must be f ollowed. ■ Incorrect operation due to ignoring instruction will cause har m or damage.
6 Room Air Conditioner Saf ety Precautions Do not install the product on a def ective instal- lation stand. Be sure the installation area does not deteriorate with age.
Ser vice Manual 7 Saf ety Precautions ■ Operation Do not turn the air-conditioner ON or OFF b y plugging or unplugging the po wer plug. Use a dedicated outlet for this appliance. • There is risk of fire or electrical shock. • There is risk of fire or electrical shock.
8 Room Air Conditioner Alwa ys check f or gas (refrig erant) leakage after installation or repair of product. Install the drain hose to ensure that water is drained awa y properly . • Low refrigerant levels may cause failure of product. • A bad connection may cause water leakage.
Ser vice Manual 9 Use a soft cloth to c lean. Do not use harsh detergents, solvents, etc. Do not touch the metal parts of the product when removing the air filter . They are very sharp! • There is risk of fire, electric shock, or damage to the plastic parts of the product.
10 Room Air Conditioner Dimensions Dimensions Indoor Unit This symbol aler ts y ou to the risk of electric shock. This symbol aler ts y ou to hazards that could cause harm to the air conditioner .
Ser vice Manual 11 Outdoor Unit Dimensions W L2 L3 L1 D H L4 L5 Gas side (3-way valve) Liquid side (2-way valve) MODEL 9k, 12k Btu Series DIM unit W mm 770 H mm 540 D mm 245 L1 mm 287 L2 mm 64 L3 mm 5.
Pr oduct Specifications Ta b l e - 1 Model Name Item Unit W MIN kcal/h.(W) Btu/h. W Cooling Capacity Type kcal/h.(W) Btu/h. W Max kcal/h.(W) Btu/h. W MIN kcal/h.
Installation Ser vice Manual 13 Installation Indoor unit 1. Do not hav e any heat or steam near the unit. 2. Select a place where there are no obstacles in front of the unit. 3. Make sure that condensation dr ainage can be conv e- niently routed aw ay .
14 Room Air Conditioner Installation Piping Length and Elev ation 9k 3/8" 1/4" 4 or 5 7 15 20 12k 1/2" 1/4" 4 or 5 7 15 20 Pipe Size Capacity (Btu/h) GAS LIQUID Max.
Ser vice Manual 15 Installation • Drill the piping hole with a ø 70mm hole core drill. Drill the piping hole at either the r ight or the left with the hole slightly slanted to the outdoor side. Drill a Hole in the W all 5-7mm (3/16"~5/16") Indoor WALL Outdoor Flaring W ork Main cause f or gas leakage is due to def ect in flaring work.
16 Room Air Conditioner Installation Check 1. Compare the flared work with the figure by . 2. If a flared section is def ectiv e, cut it off and do flaring work again. Indoor 1. Prepare the indoor unit's piping and drain hose f or installation through the wall.
Ser vice Manual 17 Installation 4. Indoor unit installation Hook the indoor unit onto the upper por tion of the installation plate.(Engage the tw o hooks of the rear top of the indoor unit with the upper edge of the installation plate.) Ensure that the hooks are properly seated on the installation plate by mo ving it left and right.
18 Room Air Conditioner Installation 1. Route the indoor tubing and the drain hose to the required piping hole position. 2. Inser t the piping, drain hose, and the connecting cable into the piping hole . 3. Inser t the connecting cable into the indoor unit.
Ser vice Manual 19 Installation Wrap the insulation material around the connecting portion. 1. Ov erlap the connection pipe heat insulation and the indoor unit pipe heat insulation material. Bind them together with vinyl tape so that there ma y be no gap .
20 Room Air Conditioner Installation CA UTION: Installation Information For left piping. Follow the instruction belo w. Good case • Press on the upper side of clamp and unf old the tubing to downward slo wly . Bad case • F ollowing bending type from right to left may cause damage to the tubing.
Ser vice Manual 21 Installation Outdoor Align the center of the pipings and sufficiently tighten the flare nut b y hand. Finally , tighten the flare nut with torque wrench until the wrench clicks . • When tightening the flare nut with torque wrench, ensure the direction f or tightening f ollows the arro w on the wrench.
22 Room Air Conditioner Installation Indoor Connect the cable to the indoor unit b y connecting the wires to the ter minals on the control board individually according to the outdoor unit connection. (Ensure that the color of the wires of the outdoor unit and the ter minal No .
Ser vice Manual 23 Installation Outdoor 1. Remov e the control cov er from the unit by loosening the screw . Connect the wires to the ter minals on the control board individually . 2. Secure the cable onto the control board with the cord clamp . 3. Refix the control cov er to the or iginal position with the screw .
24 Room Air Conditioner Installation Chec king the Drainage T o chec k the drainage . 1. P our a glass of water on the e vaporator . 2. Ensure the water flo ws through the drain hose of the indoor unit without any leakage and goes out the drain e xit.
Ser vice Manual 25 Installation Forming the Piping Form the piping by wrapping the connect- ing portion of the indoor unit with insula- tion material and secure it with two kinds of vinyl tapes. • If y ou want to connect an additional dr ain hose, the end of the drain outlet should be routed abo ve the ground.
26 Room Air Conditioner Installation Air Purging Air purging The air and moisture remaining in the refrigerant system hav e undesirable eff ects as indicated below . 1. Pressure in the system rises. 2. Operating current rises. 3. Cooling(or heating) efficiency drops.
Ser vice Manual 27 Installation Soap water method 1. Remov e the caps from the 2-wa y and 3-wa y valv es. 2. Remov e the ser vice-por t cap from the 3-way v alve . 3. T o open the 2-wa y valv e tur n the valv e stem counterclock- wise appro ximately 90 ° , wait f or about 2~3 sec, and close it.
28 Room Air Conditioner Installation 1. Check that all tubing and wiring are properly connected. 2. Check that the gas and liquid side service valv es are fully open. Prepare remote controller 1. Remov e the batter y cov er by pulling it according to the arrow direction.
Ser vice Manual 29 Installation If the actual pressure is higher than shown, the system is most lik ely over-charged, and charge should be remov ed. If the actual pressure are lower than sho wn, the system is most likely undercharged, and charge should be added.
30 Room Air Conditioner Functions • Room temperature sensor. (Thermistor) • Pipe temperature sensor. (Thermistor) • Maintain the room temperature in accordance with the Setting Temp. • Indoor fan is delayed for 5 sec at the starting. • Restarting is for approx.
Ser vice Manual 31 Functions • If power is on, it will operate to chage capacitor on controller and power relay will operate after about 2~5sec. • If outdoor temp. is below 0 ° C, preheater is operating for 1~5min. • At the initial, It will be operated compressor after 1min.
32 Room Air Conditioner Functions Healthy Dehumidification Operation Mode. ( ) Remote Control Operation ON/OFF Reset Operation Mode Selection Temperature Setting Timer Selection Timer Setting JET COOL Timer Cancel Sleep Operation Airflow Direction Control (Cooling model only) (Heating model only) TEMPERATURE LOW HIGH Cooling Operation Mode.
Operation LED displa y of indoor unit Operation Ser vice Manual 33 ■ LG Brand/OEM Brand Operation indicator Shape of display Setting temp. Standard Too hot Hot Cold Too cold Jet (Cool, Heat) Cleaning opeation Test operation Comfortable A.
34 Room Air Conditioner Operation • If the indoor pipe temperaure is below 0 ° C in 7 min. after the compressor operates without pause while in cooling cycle operation mode, ➔ compressor, outdoor fan are turned off.
Ser vice Manual 35 Operation Cooling mode operation • Operating frequency of compressor depend on the difference of the temperature. (= intake air Temp.- Compressor off Temp. • Compressor off temp.= setting temp. - 0.5 ° C on temp. = setting temp.
36 Room Air Conditioner Operation Health y Dehumidification mode operation • When the dehumidification operation is set by the remote controller the intake air temperature is detected and the setting temp. is automatically set according to the intake air temperature.
Ser vice Manual 37 Operation • Operating frequency of compressor depend on the difference of the temperature (= compressor off temp. - intake air temp.
38 Room Air Conditioner Operation Fuzzy mode operation(Optional)s • When any of operation mode is not selected like the moment of the power on or when the unit turned off, the operation mode is selected.
Ser vice Manual 39 Operation 2. Fuzzy operation for Heating • According to the setting temperature selected by Fuzzy rule, the operating frequency of compressor is deter- mined like heating mode operation.
40 Room Air Conditioner Operation • While in heating mode or Fuzzy operation, the Jet Cool key cannot be input. When it is input while in the other mode operation(cooling, dehumidification, ventilation), the Jet Cool mode is operated. • In the Jet Cool mode, the indoor fan is operated super-high speed for 30 min.
Ser vice Manual 41 Operation 1. Sleep timer operation for cooling c yc le • While in cooling mode operation, 30 min. later since the start of the sleep timer, the setting temperature increase by 1 ° C. After another 30min. elapse, it increases by 1 ° C again.
42 Room Air Conditioner Operation A uto restar ting operation For ced operation T rial Operation • When the power is restarted after a sudden power failure while in appliance operation, the mode before the power failure is kept on the memory and the appliance automatically operates in the mode on the memory.
Ser vice Manual 43 Operation ■ CT1 control • If the operating current reaches I1, the operating frequency of the compressor decrease. • After decreasing the operating frequency by 1step, if operating current is below I1 for 60 seconds continuous- ly, the operating frequency of compressor increase by 1step.
44 Room Air Conditioner • If the temperature of the heat sink TH. reaches over Toff, the Compressor stop instantly. • It will be limited the compressor operating frequency according to the heat sink TH.(refer to below FIG.) • It will be blink 4 times, when the thermistor is open or short, also the temperature is over Toff.
Ser vice Manual 45 Operation • While in heating mode operation in order to protect the evaporator pipe of the outdoor unit from freezing, reversed to cooling cycle to defrost the evaporator pipe of the outdoor unit.
46 Room Air Conditioner Operation • Function used to perform the Self Cleaning to prevent the Unit from Fungus and Bad Odors. • Used after the Shut Down of Cooling Operation to Clean the Evaporator and keep it as fresh for the Next operation. • During Self Cleaning the Outdoor Unit is Switched off.
Ser vice Manual 47 Disassembly Disassembl y 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.
48 Room Air Conditioner Disassembly 2. To remove the Control Box. • Remove securing screws. • Pull the control box out from the chassis carefully. 3. To remove the Discharge Grille. • Unhook the discharge grille and pull the dis- charge grille out from the chassis carefully.
Ser vice Manual 49 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. • Pull the motor cover out from the chassis carefully.
50 Room Air Conditioner Schematic Diagram Schematic Dia gram IRQ4/P24 P50/NWE TM4IO/P14 IRQ0/P20 IRQ1/P21 IRQ2/P22 BUZZER/P06 SBT1/P05 SBI1/P04 TM0IO/P10 TM2IO/P12 TM1IO/P11 NRST/P27 TM3IO/P13 IRQ3/P2.
Ser vice Manual 51 Schematic Diagram Outdoor(AS-W096_Series, AS-W126_Series).
52 Room Air Conditioner Schematic Diagram Wiring Diagram Indoor Unit (AS-W096/126U_0,1 Series 3854A20305E FUSE AC250V/T2A CN-TH WCN-NOISE SSR SH-CAPA. BL BR GN/YL BR YL OR BK CN-MOTOR CN-COM CN-OUT CN.
Ser vice Manual 53 Schematic Diagram Outdoor Unit AS-W096U_0 Series AS-W126U_0 Series AS-W096/126U_1 Series 3854A20310C WCN-NOISE 20A/AC 250V BR 3(BK) WCN-NOISE 2(BK) BL BK OR YL BK BK RD BL YL REVERSING VA LVE REACTOR HEA T SINK TH. OUTDOOR TH. PIPE TH.
54 Room Air Conditioner Schematic Diagram Components Location INDOOR MAIN P .W .B ASSEMBL Y (DC P ART) • T OP VIEW • BO TT OM VIEW R03H C02L J14 PCB ASSM P/NO:6871A10104 PCB P/NO : 6870A90133A R01.
Ser vice Manual 55 Schematic Diagram DISPLA Y ASSEMBL Y(AS-W096/126U_0,1 Series) T OP VIEW BO TT OM VIEW RECEIVER PWB ASM: 6871A20463 PWB: 6870A90178A LED MODULE C01G CN-DISP LED MODULE R04G R05G R01G.
56 Room Air Conditioner Schematic Diagram OUTDOOR MAIN P .W .B ASSEMBL Y (AS-W096/126U_0 Series) (AS-W096/126U_1 Series) • T OP VIEW • BO TT OM VIEW • T OP VIEW • BO TT OM VIEW BL/WH D02N C03F.
Ser vice Manual 57 T r oubleshooting Guide T roubleshooting Guide INDOOR UNIT OUTDOOR UNIT HEAT EXCHANGE (EVAPORATOR) HEAT EXCHANGE (CONDENSER) COMPRESSOR ACCUMU LATOR GAS SIDE 3-WAY VALVE LIQUID SIDE.
58 Room Air Conditioner T roubleshooting Guide CA UTION:* Capicity is based on standard length and maxim um allowance length is the basis of reliability . * Oil trap should be installed per 5~7 meters. Outdoor unit Indoor unit A B A Oil trap Outdoor unit Indoor unit B In case more than 5m 7k~14k 3/8"( Ø 9.
Ser vice Manual 59 T roubleshooting Guide 2-wa y , 3-wa y V alve 2-way Valve (Liquid Side) 3-way Valve (Gas Side) Shaft position Shaft position Service port Closed Closed Closed (with valve cap) (with.
60 Room Air Conditioner T roubleshooting Guide Required tools : hexagonal wrench, adjustable wrench, torque wrenches, wrench to hold the joints, and gas leak detector.
Ser vice Manual 61 T roubleshooting Guide • Procedure (1) Confirm that both the 2-way and 3-way valves are set to the open position. – Remove the valve stem caps and confirm that the valve stems are in the raised position. – Be sure to use a hexagonal wrench to operate the valve stems.
62 Room Air Conditioner T roubleshooting Guide Re-air Purging (Re-installation) • Procedure (1) Confirm that both the liquid side valve and the gas side valve are set to the closed position. (2) Connect the charge set and a gas cylinder to the service port of the Gas side valve.
Ser vice Manual 63 T roubleshooting Guide Balance Refrigerant of the 3-way V alve (Gas leakage) • 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. – Leave the valve on the charge set closed.
64 Room Air Conditioner T roubleshooting Guide Ev acuation (All amount of refrigerant leaked) • Procedure (1) Connect the vacuum pump to the center hose of charge set center hose (2) Evacuation for approximately one hour. – Confirm that the gauge needle has moved toward -76 cmHg (vacuum of 4 mmHg or less).
Ser vice Manual 65 T roubleshooting Guide Gas Charging (After Evacuation) • Procedure (1) Connect the charge hose to the charging cylinder. – Connect the charge hose which you dis-con- nected from the vacuum pump to the valve at the bottom of the cylinder.
66 Room Air Conditioner T roubleshooting Guide T r ouble anal ysis 1. Check temperature difference between intake and discharge air and operating current. Temp. Difference Temp. difference : approx. 0 ° C Current : less than 80% of rated current Temp.
Ser vice Manual 67 T roubleshooting Guide Self-diagnosis function The cause of malfunction Indoor TH. is short or open. Temp. of Heat sink is over 95 ° C, or Heat sink TH. is shortor open. Comunication error (serial comunication). DC peak error. Running current is over- loaded.
68 Room Air Conditioner T roubleshooting Guide ■ Precaution in Service or Check Even after stopping the operation of product, it takes some time to discharge the remaining electricity of the electrolytic capacitor that was charged.
Ser vice Manual 69 T roubleshooting Guide Electr onic P ar ts ❇ Refer to electronic contorol device drawing & schematic diagram. The Product doesn ’ t operate at all. Turn off the main power and wait to 10 seconds Turn on the main power again.
70 Room Air Conditioner T roubleshooting Guide Turn on main power. While the compressor has been stopped, the compressor does not operate owing to the delaying function for 2 minutes after stopped. When the compressor stopped Indoor Fan is driven by a low speed.
Ser vice Manual 71 T roubleshooting Guide Turn on the main power. When in air circulation mode, compressor/outdoor fan is stopped. Turn off main power. Check the electrical wiring diagram of Outdoor side. Check the open or short of connecting wires between Indoor and Outdoor.
72 Room Air Conditioner T roubleshooting Guide When indoor Fan does not operate. T rouble 4 Check the SSR high speed operation by remote control. (the Indoor Fan Motor is connected) Turn off main power. Check the connection of CN-MOTOR. Check the Fan Motor.
Ser vice Manual 73 T roubleshooting Guide • Confirm that the vertical louver is normally geared with the shaft of Stepping Motor. • If the regular torque is detected when rotating the vertical lou.
74 Room Air Conditioner Turn off main power Check the wire connection of PTC Heater (Refer to Wiring Diagram) • Check the connecting condition of CN-PTC connector on the indor DC P.C.B Ass'y. • Check the soldering condition of CN-PTC connector on the indoor DC P.
Ser vice Manual 75 Does the Operating LED of indoor unit blink when Operation's ON? Is the Connection between indoor power relay Pin ➂ and terminal block No. 1 right? Refer to the self-diagnosis function. The Outdoor Unit does not operate at all.
76 Room Air Conditioner Does the LED01M of outdoor PCB Ass'y blink 6 times? Check the state of connecting cable (3 line) between indoor and outdoor uint. When compressor does not operate normally . ■ DC Peak Error(Error Code ➅ ) T rouble 8-1 NO YES Is the connecting state of connectors in out- door.
Ser vice Manual 77 When compressor does not oprate normally . ■ Communication error between Indoor and Outdoor (Error Code ➄ ) T rouble 8-2 Does the operating LED in display PCB Ass'y blink 5 times? • Check the state of connecting cable (3 line) bewteen indoor and outdoor unit .
78 Room Air Conditioner When compressor does not oprate normally . ■ CT Error (Error Code ➆ ) T rouble 8-3 Does the operating LED in Display PCB Ass'y blink 7 times? • Check the state of connecting cable (3 line) bewteen Indoor and Outdoor Unit .
Ser vice Manual 79 ■ The pr oblem of missing the connector (INDOOR MAIN PCB ASSY) ■ The pr oblem of missing the connector (OUTDOOR MAIN PCB ASSY) Connectors CN-AC/DC CN-FAN CN-DISP1 CN-T/Block CN-DISP2 CN-TH CN-U/D Condition OPEN OPEN OPEN OPEN OPEN OPEN/SHORT OPEN • Malfunctions all indoor & outdoor unit.
80 Room Air Conditioner Exploded View Exploded Vie w 352150 354210 147581 249951 733010 346810 131410 146811-1 135311 237900 668713-1 342800 267110 359011 159830 146811-2 668713-2 135312 145200 152302.
Ser vice Manual 81 Exploded View 554031 437212 435511 552202 552116 552201 554160 561410 552111 550140 552203-1 552203-2 430410 649950 552102 437210 435301 559010 546810 661400 447910 263230 668711 Ou.
82 Room Air Conditioner Replacement P ar ts List Replacement P ar ts List Indoor Unit NOTE) * Please ensure GCSC since these parts may be changed depending upon the buyer's request.
Ser vice Manual 83 NOTE) * Please ensure GCSC since these parts may be changed depending upon the buyer's request. (GCSC WEBSITE http://biz.LGservice.
P/No.: 3828A20061Z October , 200 5 Printed in Korea.
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