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LG AS-C076QLA0 Service Manual

Room air conditioner
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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 : AS-C076QLA0
AS-C096QLA0
AS-C126RLA0
AS-C186TLB0
(Applied to new Refrigerant R410A)
http://www.LGEservice.com/techsup.html

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Summary of Contents for LG AS-C076QLA0

  • Page 1: Room Air Conditioner

    WEBSITE http://biz.LGservice.com E-MAIL http://www.LGEservice.com/techsup.html Room Air Conditioner SERVICE MANUAL CAUTION -BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. -ONLY FOR AUTHORIZED SERVICE PERSONNEL. MODEL : AS-C076QLA0 AS-C096QLA0 AS-C126RLA0 AS-C186TLB0 (Applied to new Refrigerant R410A)

  • Page 2: Table Of Contents

    Contents Details of 2002 LG Model Name .................... 3 Functions ..........................4 Product References ......................6 Dimensions ..........................7 Refrigeration Cycle Diagram ....................10 Wiring Diagram........................12 Operation Details ......................... 13 Display Function ........................20 Self-diagnosis Function....................... 20 Installation ..........................21 Operation ..........................

  • Page 3: Details Of 2002 Lg Model Name

    Details of 2003 LG Model Name Code Type Code of Model Meaning Producing Center/ L: ChangWon R22, A: ChangWon R410A, C: ChangWon R407C Refrigerant Type of Air conditioner S: Split Type Air conditioner Cooling/Heating C: C/O, H: H/P, X: C/O + E/H, Z: H/P + E/H...

  • 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: 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 6: Product References

    Product References Model Name AS-C076QLA0 AS-C096QLA0 AS-C126RLA0 AS-C186TLB0 Item Unit Cooling Capacity 7,600 9,400 12,100 18,500 Btu/h Heating Capacity Moisture Removal Power Source Ø, V, Hz 1Ø, 220-240V, 50Hz 1Ø, 220-240V, 50Hz 1Ø, 220-240V, 50Hz 1Ø, 220-240V, 50Hz Indoor Air Circulation...

  • Page 7: Dimensions

    Dimensions (1) Indoor Unit Installation plate MODEL AS-C076QLA0, AS-C096QLA0 AS-C126RLA0 AS-C186TLB0 Unit 1,090...
  • Page 8 (2) Outdoor Unit Gas side (3-way valve) Liquid side (2-way valve) MODEL AS-C076QLA0 DIM. Unit...
  • Page 9 Gas side (3-way valve) Liquid side (2-way valve) MODEL AS-C096QLA0, AS-C126RLA0 unit...
  • Page 10 Gas side Liquid side MODEL AS-C186TLB0 74.5 -10-...

  • Page 11: 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 12: Wiring Diagram

    RY-4WAY RY-FAN DISPLAY PWB ASM. DISPLAY PWB ASM. TO OUTDOOR UNIT TO OUTDOOR UNIT INDOOR WIRING DIAGRAM INDOOR WIRING DIAGRAM P/No : 3854A20238J P/No : 3854A20238H (2) Outdoor Unit AS-C076QLA0 AS-C096QLA0, AS-C186TLB0 AS-C126RLA0 OPTION CAPACITOR BR(OR) COMP. COMP MOTOR COMP...

  • Page 13: 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 14 • 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 15 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 16 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 17 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 18: 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 19 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 20: 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 •...
  • Page 21 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 22: 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 More than 60cm • Do not have any heat or steam near the unit. •...
  • Page 23 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 24: Flaring Work And Connection Of Piping

    2. Flaring Work and Connection of Piping 1) Flaring work 4. Flaring work • Firmly hold copper pipe in a die in the dimension Main cause for refrigerant leakage is due to defect in shown in the table above. the flaring work. Carry out correct flaring work using the following procedure.
  • Page 25 2) Connection of piping Indoor 3. Tape the tubing, drain hose, and the connecting cable. Be sure that the drain hose is located at the • Preparing the indoor unit's piping and drain hose for lowest side of the bundle. Locating at the upper installation through the wall.

  • Page 26: For Left Rear Piping

    • Tighten the flare nut with a wrench. • Wrap the area which accommodates the rear piping housing section with vinyl tape. Open-end wrench (fixed) Indoor Connection Flare nut unit pipe pipe Connection pipe Wrench Vinyl tape Wrap with vinyl tape (wide) Indoor unit tubing Connecting cable...
  • Page 27 3. Insert the connecting cable into the indoor unit. Outside diameter Torque • Don't connect the cable to the indoor unit. kg . m inch • Make a small loop with the cable for easy connection Ø6.35 later. Ø9.52 Ø12.7 4.
  • Page 28 • Bundle the piping and drain hose together by wrap- Press the lower left and right sides of the unit against ping them with cloth tape over the range within which the installation plate until the hooks engage into their they fit into the rear piping housing section.

  • Page 29: 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 30 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 31: 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 32 5. 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 Operation starts when this button is pressed and stops when the button is pressed again. Remote Control OPERATION MODE SELECTION BUTTON Used to select the operation mode. Signal transmitter 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. • Set the up-and-down air discharge louver to open position (horizontally) by finger pressure.
  • Page 35 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.
  • 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: Pumping Down

    1. 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 39 2. 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 40: Gas Charging

    3. 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 CAUTION (1) Connect the charge hose to the charging This is different from previous procedures. cylinder.
  • Page 41 4. 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 42: 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 43: 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 44 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 45 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 46: 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 63 of Micom, and the part for driving TRIAC(the input and output signal of IC01M, PIN NO 7, 10) •...
  • Page 47 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 48 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 49 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. -48-...

  • Page 50: Electronic Control Device

    Electronic Control Device (1) MAIN P.W.B ASSEMBLY (AC PART) • COOLING MODEL • HEAT PUMP MODEL -49-...
  • Page 51 (2) MAIN P.W.B ASSEMBLY (DC PART) • TOP VIEW • BOTTOM VIEW -50-...
  • Page 52 (3) DISPLAY ASSEMBLY – 6871A20194 • TOP VIEW • BOTTOM VIEW – 6871A30009 • TOP VIEW • BOTTOM VIEW – 6871A20227 • TOP VIEW • BOTTOM VIEW -51-...

  • Page 53: Schematic Diagram

    Schematic Diagram Cooling Model -52-...
  • Page 54 Heat Pump Model -53-...

  • Page 55: Exploded View And Replacement Parts List

    Exploded View and Replacement Parts List 1-1. Indoor Unit • AS-C076QLA0, AS-C096QLA0, AS-C126RLA0 135312 152313 135314 152302 131410 733010 359011 342800 159830 159901 668713 268712 346810 35211B 354212 135516 352150 135311 268714-2 146811-1 146811-2 263230 264110 266090 267110 249951 268714-1...
  • Page 56 Parts List (Indoor) PART No. LOCATION DESCRIPTION REMARKS AS-C076QLA0 AS-C096QLA0 AS-C126RLA0 131410 CHASSIS ASSEMBLY 3141A20006A 3141A20006A 3141A20005A 135311 GRILLE ASSEMBLY, DISCHARGE(INDOOR) 3531A10127P 3531A10127P 3531A10107Y 135312 GRILLE ASSEMBLY, FRONT(INDOOR) 3531A20101X 3531A20101X 3531A10118Z 135314 GRILLE ASSEMBLY, INLET SUB 3531A20100T 3531A20100T 3531A10117V 135516...
  • Page 57 1-2. Indoor Unit • AS-C186TLB0 135312 152313 135314 267110-1 152302 135511 131410 733010 359011 342800 159830 135311 159901-1 159901-2 668713 268712 249951 346810 35211B 354212 135516 352150 268714-2 146811-1 146811-2 264110 268714-1 266090 263230 W6640 -56-...
  • Page 58 Parts List (Indoor) PART No. LOCATION DESCRIPTION REMARKS AS-C186TLB0 131410 CHASSIS ASSEMBLY 3141A10002A 135311 GRILLE ASSEMBLY, DISCHARGE(INDOOR) 3531A10116T 135316 GRILLE ASSEMBLY, FRONT(INDOOR) 3531A20108V 135314 GRILLE ASSEMBLY, INLET SUB 3531A20107T 135500 COVER ASSEMBLY, MOTOR 3551A20050F 146811-1 4681A20055A MOTOR ASSEMBLY, STEP 146811-2 4681A20055A 152302 FILTER(MECH), A/C...
  • Page 59 2-1. Outdoor Unit • AS-C076QLA0 437212 554031 435511 435512 552102 546810 559010 552111 649950 W0CZZ 567502 554160 447910 550140 552203-1 430410 552203-2 437210 -58-...
  • Page 60 Parts List (Outdoor) PART No. LOCATION DESCRIPTION REMARKS AS-C076QLA0 430410 BASE ASSEMBLY, WELD[OUTDOOR] 3041A20016A 435511 COVER ASSEMBLY, CONTROL(OUTDOOR) 3551A30023Z 435512 COVER ASSEMBLY, TOP(OUTDOOR) 3551A20034A 437210 PANEL ASSEMBLY, FRONT(OUTDOOR) 3721A20060B 437212 PANEL ASSEMBLY, REAR(OUTDOOR) 3721A20059A 447910 BARRIER ASSEMBLY, OUTDOOR 4791A20011A 546810...
  • Page 61 2-2. Outdoor Unit • AS-C096QLA0, AS-C126RLA0 437210 437212 554031 435511 546810 552102 559010 649950 552111 W0CZZ 567502 554160 447910 550140 552203-1 430410 552203-2 -60-...
  • Page 62 Parts List (Outdoor) PART No. LOCATION DESCRIPTION REMARKS AS-C096QLA0 AS-C126RLA0 430410 BASE ASSEMBLY, WELD[OUTDOOR] 3041A20008J 3041A20008J 435511 COVER ASSEMBLY, CONTROL(OUTDOOR) 3551A30023C 3551A30023C 437210 PANEL ASSEMBLY, FRONT(OUTDOOR) 3721A20027B 3721A20027B 437212 PANEL ASSEMBLY, REAR(OUTDOOR) 3721A20026A 3721A20026A 447910 BARRIER ASSEMBLY, OUTDOOR 4791A30002A 4791A30002A 546810 MOTOR ASSEMBLY, OUTDOOR 4681A20004J...
  • Page 63 2-3. Outdoor Unit • AS-C186TLB0 554031 437212 552102 552111 649950 435512 435511 W0CZZ 559010 546810 567502 435301 447910 554160 552560 552203-2 550140 430410 552203-1 437210 -62-...
  • Page 64 Parts List (Outdoor) PART No. LOCATION DESCRIPTION REMARKS AS-C186TLB0 430410 BASE ASSEMBLY,WELD[OUTDOOR] 3041A30003F 435511 COVER ASSEMBLY,CONTROL(OUTDOOR) 3551A30007G 435512 COVER ASSEMBLY,TOP(OUTDOOR) 3H03266K 437210 PANEL ASSEMBLY,FRONT(OUTDOOR) 3721A20005H 437212 PANEL ASSEMBLY,REAR 3720AP0003D 447910 BARRIER ASSEMBLY,OUTDOOR 2H02110M 546810 MOTOR ASSEMBLY,OUTDOOR 4681A20013A 550140 ISOLATOR,COMP 4H00982E 552102 TUBE,CAPILLARY BEND 7072AR9374F...
  • Page 65 February, 2003 P/No.: 3828A20164C Printed in Korea...

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