LG A-12AH Series Service Manual Download Page 40

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Room Air Conditioner

Schematic Diagram

Components Location

MAIN P.W.B ASSEMBLY (AC PART)
• HEAT PUMP MODEL

CN-MOTOR2

R07D

R01D

PWB : 6870A90161D

CN-O2

GND

T/BLOCK

1(L)

2(N)

CN-COMP

CN-OUT

RY-FAN

RY-4WAY

CN-POW1

RY-O2

ZNR01N

CN-COM

FUSE

RY-COMP

CN-POW2

R15D

250V-T3.0A

250V-T3.15A

125V-T3.15A

PWB ASM : 6871A10121

C01N

NF01N

D01D

CN-GND1

C01D

BD01D

CY1

CY2

NTC

R03D

R02D

IC01D

C02N

C09D

D07D

C14D

IC02D

CY4

R04D

IC03D

CY3

D04D

C11D

SMPS

R14D

IC06D

ZD01D

D02D

C02D

D03D

R13D

R06D

CY5

IC05D

C04D

C12D

ZD02D

C03D

R05D

CN-MOTOR1

R16D

C10D

Q02G

Q01G

R12D

R10D

IC08D

IC07D

CN-ACDC1

R08D

D05D

D06D

R09D

R11D

MAIN P.W.B ASSEMBLY (DC PART)
• TOP VIEW

• BOTTOM VIEW

Summary of Contents for A-12AH Series

Page 1: ...er SERVICE MANUAL LG CAUTION website http www lgservice com BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL ONLY FOR AUTHORIZED SERVICE PERSONNEL MODELS AS H076PB D M WL1 AS H096PB D M WL1 A 12AH series ...

Page 2: ...o the Indoor Unit 19 Connecting the Cables to the Outdoor Unit 20 Checking the Drainage 21 Forming the Piping 21 Air Purging 22 Air Purging with Vacuum Pump 22 Front Panel Assembly 24 Test Running 25 Operation 26 Function of Controls 26 Display Function 33 Self diagnosis Function 34 Remote Control Operations 35 Disassembly 36 Indoor Unit 36 Schematic Diagram 38 Electric control Device 38 Wiring Di...

Page 3: ...50Hz E 265V 60Hz 7 110V 50 60Hz F 200V 50 60Hz 8 380 415V 50Hz 9 380 415V 60Hz 7 Chassis A Z Name of Chassis of Unit Ex LSP SP Chassis 8 Look A Z Look Color Artcool Model 9 Function A Z 10 Serial No 1 9 LG Model De ARTCOOL COLOR velopment Serial No Basic A Basic 4Way B Plasma Filter C Plasma Filter 4 Way D Tele LCD E Tele LCD Nano plasma 4Way F Nano Plasma F A changeove A clean Low A G Nano Plasma...

Page 4: ... For installation of the product always contact the service center or a professional installation agency Otherwise it may cause electrical shock Otherwise it may cause a fire or electrical shock Otherwise it may cause a fire elec trical shock explosion or injury Securely attach the electrical part cover to the indoor unit and the service panel to the outdoor unit Always install an air leakage brea...

Page 5: ...y cause injury It will cause an electric shock or a fire due to heat generation Otherwise it may cause a fire or electrical shock Use caution when unpacking and installing Do not share the outlet with other appliances Do not use the damaged power cord Ensure that an installation frame of the outdoor unit is not damaged due to use for a long time Do not disassemble or repair the product randomly Do...

Page 6: ...he metal parts of the unit when removing the fil ter Otherwise it may electrical shock and failure Otherwise it may cause the failure of machine or electrical shock They are sharp and may cause injury Do not step on the indoor outdoor unit and do not put anything on it Do not place a heavy object on the power cord It may cause an injury through dropping of the unit or falling down Otherwise it may...

Page 7: ...ute with the neighbors Otherwise it may cause the failure of product Wax Thinner Keep level parallel in installing the product Avoid excessive cooling and perform ventila tion sometimes Otherwise it may cause vibration or water leakage Otherwise it may do harm to your health Use a soft cloth to clean Do not use wax thin ner or a strong detergent When gas leaks open the window for ventila tion befo...

Page 8: ...e H W D W mm 570 H mm 568 D mm 137 Model Dimension INDOOR UNIT Indoor Unit This symbol alerts you to the risk of electric shock This symbol alerts you to hazards that may cause harm to the air conditioner This symbol indicates special notes NOTICE Symbols used in this Manual ...

Page 9: ...e Manual 9 Outdoor Unit Dimensions W L2 L3 L1 D H L4 L5 Gas side 3 way valve Liquid side 2 way valve MODEL AS H076PB D M WL1 DIM unit W mm 575 H mm 525 D mm 260 L1 mm 301 L2 mm 73 L3 mm 392 L4 mm 35 L5 mm 100 ...

Page 10: ...Conditioner W L2 L3 L1 D H L4 L5 Gas side 3 way valve Liquid side 2 way valve MODEL AS H096PB D M WL1 AS H126PB D M WL1 DIM unit W mm 770 H mm 540 D mm 245 L1 mm 285 L2 mm 64 L3 mm 518 L4 mm 10 L5 mm 100 Dimensions ...

Page 11: ...r Outdoor Liquid Gas Service Valve Motor Output Dimensions W x H x D Net Weight W mm kg AS H076PB D M WL1 AS H096PB D M W L1 A 12AH series 7500 9200 12000 7700 9400 12200 1 1 2 1 5 1Ø 220 240V 50Hz 1Ø 220 240V 50Hz 1Ø 220 240V 50Hz 5 5 6 8 8 3 20 26 26 37 39 44 48 48 48 685 840 1099 705 860 1200 3 3 8 4 9 3 1 3 85 5 3 10 95 10 95 10 92 3 2 3 2 2 98 24 24 24 18 25 5 25 5 570 x 568 x 137 570 x 568 x...

Page 12: ...e Do not place animals and plants in the path of the warm air Take the air conditioner weight into account and select a place where noise and vibration are mini mum Select a place so that the warm air and noise from the air conditioner do not disturb neighbors More than 10cm More than 50cm More than 2m More than 50cm More than 10cm More than 10cm More than 60cm More than 60cm More than 70cm CAUTIO...

Page 13: ...c tion 2 Insert drain hose into the handle of drain pan and join drain hose and connecting hose according to the figure by NOTICE Open front panel 1 Push the front panel backward and lift it up to remove the two screws 2 As soon as you lift the both lower parts of panel front you can hear the sound from panel front At this moment panel front is separated 3 After pulling down this panel a bit separ...

Page 14: ...tic anchors into drilled points 4 Hang the hole of product at the upper screws and remove the map Falling attention 5 Check the fixed product with light power 1 Attach an Installation guide map on the desired surface 6 Look at suited horizon by horizontal meter on the horizontal setting line and fix lightly the map by adhesive tape 7 Drill the pierted part as a diameter of 50mm for connecting pipi...

Page 15: ...s into the tubing Putting nut on Remove flare nuts attached to indoor and outdoor unit then put them on pipe tube having completed burr removal not possible to put them on after flaring work Flaring work 1 Firmly hold copper pipe in a die in the dimension shown in the table below 2 Carry out flaring work with the flaring tool Copper pipe 90 Slanted Uneven Rough Pipe Reamer Point down Flare nut Cop...

Page 16: ...e furniture or floors Foamed polyethylene or equivalent is recommended NOTICE Route the indoor tubing and the drain hose in the direction of rear left or right Tape the tubing drain hose and the connecting cable Be sure that the drain hose is located at the lowest side of the bundle Locating at the upper side can cause drain pan to overflow inside the unit Inclined Inside is shiny without scratche...

Page 17: ...modates the rear piping housing section with vinyl tape 3 Bundle the piping and drain hose together by wrap ping them with vinyl tape over the range within which they fit into the rear piping housing section Service Manual 17 Installation Wrap with vinyl tape Drain hose Pipe Vinyl tape wide Indoor unit tubing Flare nut Pipes Wrench Indoor unit tubing Connection pipe Flare nut Open end wrench fixed...

Page 18: ... torque wrench until the wrench clicks When tightening the flare nut with torque wrench ensure the direction for tightening follows the arrow on the wrench mm inch kg m Ø6 35 1 4 1 8 Ø9 52 3 8 4 2 Ø12 7 1 2 5 5 Ø15 88 5 8 6 6 Ø19 05 3 4 6 6 Outside diameter Torque Outdoor unit Gas side piping Bigger diameter Liquid side piping Smaller diameter Torque wrench ...

Page 19: ... to the wiring diagram CAUTION If a power plug is not used provide a circuit breaker between power source and the unit as shown by CAUTION The power cord connected to the A unit should be selected according to the following specifications Type B approved by HAR or SAA The power connecting cable connecting the indoor and outdoor unit should be selected according to the following specifications Type...

Page 20: ...ibrations to which the unit is subjected during the course of transportation Check them and make sure that they are all tightly fastened If they are loose it could cause burn out of the wires 3 Specification of power source 4 Confirm that electrical capacity is sufficient 5 See to that the starting voltage is maintained at more than 90 percent of the rated voltage marked on the name plate 6 Confir...

Page 21: ...installed below the indoor unit perform the following Tape the piping drain hose and connecting cable from down to up Secure the tapped piping along the exterior wall using saddle or equivalent 3 In cases where the Outdoor unit is installed above the Indoor unit perform the following Tape the piping and connecting cable from down to up Secure the taped piping along the exterior wall Form a trap to...

Page 22: ...tdoor unit Note that both the liquid and the gas side service valves on the outdoor unit are kept closed at this stage 2 Leak test Connect the manifold valve with pressure gauges and dry nitrogen gas cylinder to this service port with charge hoses Pressurize the system to no more than 150 P S I G with dry nitrogen gas and close the cylin der valve when the gauge reading reached 150 P S I G Next te...

Page 23: ...ly with an adjustable wrench This process is very important to prevent leakage from the system Replace the valve caps at both gas and liquid side service valves and fasten them tight This completes air purging with a vacuum pump The air conditioner is now ready to test run 1 Remove the caps from the 2 way and 3 way valves 2 Remove the service port cap from the 3 way valve 3 To open the 2 way valve...

Page 24: ...r cord in the bottom groove of cover side left 2 Assemble connecting lead wire with controller fix the upper part of the front panel and match the lower part of the front panel 3 Screw up the front panel and suspend the hook of the front panel in the groove Panel Front Connector Front Panel Assembly ...

Page 25: ... For reference the gas side pressure of optimum condition is as below Cooling If the actual pressure is higher than shown the system is most likely over charged and charge should be removed If the actual pres sure are lower than shown the system is most likely undercharged and charge should be added The air conditioner is now ready for use NOTICE NOTICE Bolt Tubing connection Discharge temperature...

Page 26: ...e in appliance pause Timer Indicator On while in timer mode on off and in sleep timer mode off when timer mode is completed or canceled Defrost Indicator Off except when hot start during heating mode operation or while in defrost control Plasma Indicator On while in plasma mode off while plasma mode is canceled Auto restart Indicator On while auto restart mode off while auto restart mode is cancel...

Page 27: ... fan is off when the indoor pipe temp is below 33 C when above 35 C it operates with the low airflow speed If overloaded while in heating mode operation in order to prevent the compressor from OLP operation the out door fan is turned on off according to the indoor pipe temp While in defrost control both of the indoor and outdoor fans are turned off Defrost Control While in heating mode operation i...

Page 28: ... carried out for 10 sec or longer before Fuzzy operation the mode before Fuzzy operation is operated 1 Fuzzy Operation for Cooling 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 Compressor ON Temp Setting Temp 0 5 C Compres...

Page 29: ...d according to the intake air temp at that time 20 C Intake Air Temp Intake Air Temp 0 5 C Intake Air Temp 20 C 20 C When the Fuzzy key Temperature Control key is input after the initial setting temperature is selected the Fuzzy key value and the intake air temperature at that time are compared to select the setting temperature automatically according to the Fuzzy rule While in Fuzzy operation the...

Page 30: ...t Cool mode operates In the Jet Cool mode the indoor fan is operated at super high speed for 30 min at cooling mode operation In the Jet Cool mode operation the room temperature is controlled to the setting temperature 18 C When the sleep timer mode is input while in the Jet Cool mode operation the Jet Cool mode has the priority During the JET COOL function at any moment the A C starts to blow the...

Page 31: ...pipe from frosting If the indoor pipe temp is below 0 C in 7 min after the compressor operates without any pause while in cooling cycle operation mode the compressor and the outdoor fan are turned off in order to protect the indoor evapo rator pipe from frosting When the indoor pipe temp is 7 C or higher after 3 min pause of the compressor the compressor and the out door fan is turned on according...

Page 32: ...unction The function is to be stopped while it is operating with selecting the function When an air cleaner function is selected during operation off The function will be only operated When inlet grille of air conditioner is opened during plasma operation High Voltage Generator H V B is to be stopped When inlet grille of air conditioner is closed during plasma operation High Voltage Generator H V ...

Page 33: ...ting Cooling Soft Dry Fan Sleep Mode Sleep Mode Timer Mode Timer Mode Hot start Defrost PLASMA Mode PLASMA Mode Operation Indicator Timer Indicator Sleep Timer Indicator Defrost Indicator PLASMA Indicator Operation Indicator Timer Indicator Sleep Timer Indicator Outdoor Unit Operation PLASMA Indicator ...

Page 34: ...osis Function 3sec 3sec 3sec once Error Code 1 Error Display LED Indoor body operation LED Error contents Indoor room temperature thermistor open short Indoor pipe temperature thermistor open short Indoor Thermistor assembly check SVC check point ...

Page 35: ...d in cooling heating mode 6 CHAOS SWING BUTTON Used to stop or start louver movement and set the desired up down airflow direction 7 ON OFF TIMER BUTTONS Used to set the time of starting and stopping opera tion 8 TIME SETTING BUTTONS Used to adjust the time 9 TIMER SET CANCEL BUTTON Used to set the timer when the desired time is obtained and to cancel the Timer operation 10 SLEEP MODE AUTO BUTTON ...

Page 36: ... panel front After pull down this panel a bit separate connecting wire with product 2 To remove the Control Box Before removing the control box be sure to disconnect the wires from PWB Pull the cover control out from the control box and disconnect other wires Remove securing screws Pull the control box out from the chassis carefully Step Motor Connectors Sensor Connector Comp Connector 4Way Fan Co...

Page 37: ...Turbo Fan Remove the securing screws from the chassis Pull the pipe cover top cover and the air guide 5 To remove the Motor Remove the securing bolt from the motor shaft Pull the fan out from the motor shaft Remove 4 screws securing motor mount from the chassis and lift up the motor mount and the bracket Top Cover Pipe Cover Air Guide Turbo Fan Bracket Bolt Motor Mount ...

Page 38: ...WH 1 2 1 2 R14D 1K R13D 1K SMPS VOLTAGE GND GND D03D 1K ZD01D BZX55C11 VOLTAGE GND DC LOW CY3 103 DIP CY4 DC HIGH PC 17K1 1 4W R06D 39 1K R07D 6 4 1 3 12uH DIP IC02D C09D 104 470uF 25V C04D UG2D 10K R29H 220uF 35V C03D 15V 10K R16D OJ01H OJ02H R28H 20K UG2D D02D 470uF C02D R13D L1 1K 1 2W 12uH DIP R05D L2 35V PWM C11H 50V 103 10K R30H CN ACDC2 CN ACDC1 1 1 103 50V C12H TNY266P 1 S BP 2 IC01D 4 D E...

Page 39: ...Service Manual 39 Wiring Diagram Schematic Diagram Indoor Unit Outdoor Unit AS H076PB D M WL1 AS H096PB D M WL1 AS H126PB D M WL1 ...

Page 40: ...FUSE RY COMP 4 3 CN POW2 R15D 250V T3 0A 250V T3 15A 125V T3 15A PWB ASM 6871A10121 C01N NF01N D01D CN GND1 C01D BD01D CY1 CY2 NTC R03D R02D IC01D C02N C09D D07D C14D IC02D CY4 R04D IC03D CY3 D04D 1 C11D SMPS R14D IC06D ZD01D D02D C02D D03D R13D R06D CY5 L1 IC05D C04D C12D ZD02D C03D R05D CN MOTOR1 1 L3 R16D C10D Q02G Q01G R12D R10D L2 IC08D IC07D CN ACDC1 R08D D05D D06D R09D R11D MAIN P W B ASSEM...

Page 41: ...tic Diagram DISPLAY ASSEMBLY 6871A20462 TOP VIEW BOTTOM VIEW SUB P W B ASSEMBLY 1 1 1 CN 12V WH 1 CN D6 CN D7 1 CN D8 CN D5 1 1 1 1 CN CON WH CN SW BL 1 C01V PWB ASM 6871A20363 PWB 6870A90126B CN D3 CN D1 1 CN D2 1 CN D4 C02V ...

Page 42: ...HANGE EVAPORATOR HEAT EXCHANGE CONDENSER HEAT EXCHANGE CONDENSER COMPRESSOR COMPRESSOR ACCUMU LATOR GAS SIDE GAS SIDE 3 WAY VALVE LIQUID SIDE LIQUID SIDE 3 WAY VALVE CAPILLARY TUBE CAPILLARY TUBE CHECK VALVE Heating Model only COOLING HEATING REVERSING VALVE Heating Model Only 1 Cooling Only Models Refrigeration Cycle Diagram 2 Cooling Heating Models ...

Page 43: ...ise connected manifold gauge Open Open Open with charging cylinder Open Open Open with charging cylinder Open Open Open Open Works Shipping Air purging Installation Operation Pumping down Transfering Evacuation Servicing Gas charging Servicing Pressure check Servicing Gas releasing Servicing 1 2 3 4 5 6 Valve cap Open position Closed position Pin Service port Service port cap To outdoor unit Flare...

Page 44: ... the charge hose Open the low pressure valve on the charge set slightly to air purge from the charge hose 5 Set the 2 way valve to the closed position 6 Operate the air conditioner at the cooling cycle and stop it when the gauge indicates 1kg cm2 g 7 Immediately set the 3 way valve to the closed position Do this quickly so that the gauge ends up indi cating 3 to 5kg cm2 g 8 Disconnect the charge s...

Page 45: ...rge set and discharge the refrigerant until the gauge indi cates 0 kg cm2 G If there is no air in the refrigerant cycle the pressure when the air conditioner is not running is higher than 1 kg cm2 G discharge the refrig erant until the gauge indicates 0 5 to 1 kg cm2 G if this is the case it will not be neces sary to apply a evacuatin Discharge the refrigerant gradually if it is dis charged too su...

Page 46: ...ward 76 cmHg vacuum of 4 mmHg or less 3 Close the valve Lo side on the charge set turn off the vacuum pump and confirm that the gauge needle does not move approxima tely 5 minutes after turning off the vacuum pump 4 Disconnect the charge hose from the vacuum pump Vacuum pump oil If the vacuum pump oil becomes dirty or depleted replenish as needed Lo Open Open Vacuum pump 3 Way valve Outdoor unit L...

Page 47: ... a time approximately 150g each time while operating the air conditioner in the cooling cycle however one time is not suffi cient wait approximately 1 minute and then repeat the procedure pumping down pin 4 Immediately disconnect the charge hose from the 3 way valve s service port Stopping partway will allow the gas to be dis charged If the system has been charged with liquid refrigerant while ope...

Page 48: ...ir humidity When the room air humidity is relativery higher temperature difference is smaller When the room air humidity is relatively lower tem perature difference is larger 2 Check temperature and pressure of refrigeration cycle 1 The suction pressure is usually 4 5 6 0 kg cm2 G Cooling at normal condition 2 The temperature can be measured by attaching the thermometer to the low pressure tubing ...

Page 49: ... Fuse Pattern damage Varistor ZNR01N Check the connection housing for contacting Connector related to CN POWER1 2 Connector related to CN MOTOR Connector contacting of Outdoor Fan Compressor Display PWB Assembly Check Check each load Indoor Outdoor Fan Motor Compressor Stepping Motor and contacting condition of related connector Main PCB Board Operation Check Items SMPS Transformer Indoor unit Inp...

Page 50: ...ed in LCD screen replace battery Check the contact of CN D1 2 connector 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 When operated in the Sleeping Mode the wind speed is set to the low speed by force Check Display PWB Assembly Voltage between CN D2 DC 5V Check the connecting circuit between the remote contro...

Page 51: ...ngaged Compressor Outdoor Fan is stopped Check R02H 12 1k R04H 6 2k Micom Pin 26 27 Check the indoor temperature sensor is disconnected or not About 10kΩ at 25 C Turn off Main Power Check the electrical wiring diagram of outdoor side Check the abnormal condition for the component of Compressor Outdoor Fan Motor Check the open or short of conmecting wires between indoor and outdoor Check Relay RY C...

Page 52: ...for dehumidifying mode Change operation for cooling mode Turn off Main power Check the connection of CN MOTOR1 2 Check the Fan Motor Check the Fuse AC250V 3 15A Turn ON Main Power Check PWM signal from Micom Pin 50 Check On Off signal from micom pin14 Check Voltage of CN Motor 1 2 pin is about 15V ...

Page 53: ...ring condition on PWB of CN UD LR1 LR2 Connector If there are no problems after above checks Confirm the assembly conditions that are catching and interfering parts in the rotation radial of the Louvers Check the operating circuit of the Louvers Confirm that there is DC 12V between pin of CN UD and GND Confirm that there is a soldering short at following terminals Between of MICOM Between of IC02M...

Page 54: ...perature is disconnected or not about 10KΩ at 25 C Check the indoor pipe temperature is disconnected or not about 5KΩ at 25 C Turn ON Main Power Check the DC voltage on the PWB ASSEMBLY The details of check are as followings Check point Between Micom NO 63 and GND Between IC02M NO 14 and GND Comp ON DC 5V Below DC 1V Comp OFF DC 0V About DC 12V Check point Between Micom NO 51 and GND Between IC03M...

Page 55: ... 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 ...

Page 56: ...35500 3 349600 135500 2 135311 1 146811 147581 330870 135311 3 146811 346810 135500 1 146811 135311 2 131410 352380 352150 35211B 263230 147581 152302 135314 268712 268717 135312 354210 144710 2 146811 146811 144710 1 147581 352116 352115 249951 268714 1 159830 268714 2 Indoor Unit ...

Page 57: ... 57 Exploded View 554031 437212 435511 W0CZZ 552202 567502 552116 552201 554160 561410 552111 550140 552203 1 552203 2 430410 447910 649950 552102 2 552102 1 437210 435301 559010 546810 Outdoor Unit AS H076PB D M WL1 ...

Page 58: ...ditioner 554031 437212 435511 W0CZZ 552202 567502 552116 552201 554160 561410 552111 550140 552203 1 552203 2 430410 447910 649950 552102 437210 435301 559010 546810 Outdoor Unit AS H096PB D M WL1 A 12AH Exploded View ...

Page 59: ... 4995A20372Q 4995A20372E 4995A20372A R 263230 THERMISTOR ASSEMBLY 6323A20004N 6323A20004N 6323A20004N R 264110 POWER CORD ASSEMBLY 6411A20014S 6411A20014S 6411A20014S R 267110 REMOTE CONTROLLER ASSEMBLY 6711A20073Z 6711A20073Z 6711A20073Z R 268712 PWB PCB ASSEMBLY DISPLAY 6871A20462A 6871A20462A 6871A20462A R 268714 1 PWB PCB ASSEMBLY MAIN 6871A10121A 6871A10121A 6871A10121A R 268714 2 PWB PCB ASS...

Page 60: ...4H00982E 4H00982E R 552111 TUBE ASSEMBLY CAPILLARY 5211A21121B 5211A30331Q 5211A20117J R 552116 TUBE ASSEMBLY REVERSING 5211A20188U 5211A20160E 5211A20140X R 552201 VALVE CHECK 5220AR7182A 5220AR7182A 5220AR7182A R 552202 VALVE REVERSING 5220AR3228D 5220AR3228B 5220AR3228D R 552203 1 VALVE SERVICE 2H02479P 2H02479H 2H02479H R 552203 2 VALVE SERVICE 5220A20001B 5220A20001B 5220A20006B R 554031 COND...

Page 61: ...Service Manual 61 Memo ...

Page 62: ...62 Room Air Conditioner Memo ...

Page 63: ...P No 3828A20135S February 2004 Printed in Korea ...

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