LG Art Cool LA120CP Service Manual Download

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Room

Air Conditioner

SERVICE MANUAL

CAUTION

website http://www.lgservice.com

• BEFORE SERVICING THE UNIT, READ THE SAFETY

PRECAUTIONS IN THIS MANUAL.

• ONLY FOR AUTHORIZED SERVICE PERSONNEL.

MODELS: LA090CP
LA120CP

Summary of Contents for Art Cool LA120CP

Page 1: ...oom Air Conditioner 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 LA090CP LA120CP ...

Page 2: ...cting the Cables to the Outdoor Unit 18 Checking the Drainage 19 Forming the Piping 19 Air Purging 20 Air Purging with Vacuum Pump 20 Front Panel Assembly 22 Test Running 23 Operation 24 Function of Controls 24 Display Function 25 Self diagnosis Function 25 Remote Control Operations 26 Disassembly 27 Indoor Unit 27 Troubleshooting Guide 29 Refrigeration Cycle Diagram 29 2 way 3 way Valve 30 Cycle ...

Page 3: ... Look Color Artcool Model 9 Function A Z 10 Serial No 1 9 LG Model Development Serial No ARTCOOL COLOR 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 F A changeove A clean 4way Low A H Tele LED 4way I Internet J Plasma F 4Way Oxy generator K Nano Plasma F A changeove A clean L Nano Plasma F A c...

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: ...Service Manual 9 W L2 L3 L1 D H L4 L5 Gas side 3 way valve Liquid side 2 way valve MODEL 9K 12K Models 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 10: ... 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 CAUTION Install the indoor unit on the wall where the height from the floor is more than 2 meter CAUTION Capacity is...

Page 11: ...desired drain direc 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...

Page 12: ...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 13: ...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 14: ...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 15: ...e area which accommodates 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 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 16: ... 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 17: ...eferring 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 specificati...

Page 18: ...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 Confirm that the...

Page 19: ...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 20: ...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 21: ...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 22: ...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 23: ... 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 24: ...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 25: ...tor Timer Indicator Sleep Timer Indicator Defrost Indicator PLASMA Indicator Operation Indicator Timer Indicator Sleep Timer Indicator Outdoor Unit Operation PLASMA Indicator Self diagnosis 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...

Page 26: ...peed 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 BUTT...

Page 27: ...nel 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 Conne...

Page 28: ...he 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 29: ...8g INDOOR UNIT HEAT EXCHANGER EVAPORATOR HEAT EXCHANGER CONDENSER COMPRESSOR GAS SIDE CAPILLARY TUBE LIQUIDSIDE OUTDOOR UNIT Cooling Only Models MODEL 9K 12K Cooling Only Pipe size Diameter ø Piping length Elevation Gas Liquid Rated Max Rated Max 1 2 1 4 7 62m 25ft 15m 50ft 5m 16ft 7m 23ft a proper quantity of refrigerant 9K 12K 20g Troubleshooting Guide Troubleshooting Guide Refrigeration Cycle D...

Page 30: ...n 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 nut To piping connection To outdoor ...

Page 31: ...hexagonal wrench to press the valve core pin discharge for three seconds and then wait for one minute Repeat this three times 5 Use torque wrench to tighten the service port nut to a torque of 1 8kg cm 6 Set the 3 way valve to the back seat 7 Mount the valve stem nuts to the 2 way and 3 way valves 8 Check for gas leakage At this time especially check for gas leakage from the 2 way and 3 way valve ...

Page 32: ...en 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 set and mount the 2 ...

Page 33: ... on the 2 way valve 4 Check for gas leakage Check the flare connections for gas leakage 5 Discharge the refrigerant Close the valve on the gas cylinder and dis charge the refrigerant until the gauge indicates 3 to 5 kg cm2 g 6 Disconnect the charge set and the gas cylin der and set the 2 way and 3 way valves to the open position Be sure to use a hexagonal wrench to operate the valve stems 7 Mount ...

Page 34: ...harge the refrigerant until the gauge indicates 0 kg cm2 G If there is no air in the refrigerant cycle the pressure when the air conditioner is not run ning is higher than 1 kg cm2 G discharge the refrigerant 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 suddenly the refrig...

Page 35: ...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 2 Way valve Outdoor unit Liquid side Indoor unit Gas sid...

Page 36: ...ch 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 operating the air conditioner tu...

Page 37: ...humidity When the room air humidity is relatively higher temperature difference is smaller When the room air humidity is relatively lower temperature difference is larger 2 Check temperature and pressure of refrigeration cycle Notice 1 The suction pressure is usually 4 5 5 0 kg cm2G at normal condition 2 The temperature can be measured by attaching the thermometer to the low pressure tubing and wr...

Page 38: ...onnector contacting of Outdoor Fan Compressor Display PWB Ass y Check Connector related to CN DC DC Check each load Indoor Outdoor Fan Motor Compressor Stepping Motor and contacting condition of related connector including connecting cable of Indoor Outdoor Unit PCB Board Operation Check Items Power Transformer Outdoor unit Input Voltage Output Voltage IC2 7812 Output Indoor Outdoor unit IC3 7805 ...

Page 39: ...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 DISP PWB Ass y Voltage between CN DISP DC 5V When the detect switch double key inside the remote controller door is fault it is impossible to operate temperature regulating and wind speed selecti...

Page 40: ... R02 12 1K R04 6 2K Micom No 27 Indoor unit Check the indoor temperature sensor is disconnected or not About 10kΩ at 25 C When the temperature around Outdoor PWB Ass y is above 163 F the compressor is stop and only Outdoor Fan is operating 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 Rel...

Page 41: ...B Assy s Check the connecting condi tion and disconnection of connecting wires between Indoor and Outdoor unit Check the pattern and the condition of Indoor unit PWB Ass y Check the interference of Indoor Fan Does the voltage of each terminals of CN MOTOR CONNECTOR in Indoor unit corresponds to values in the Table of page 51 Check the motor of Indoor Fan Indoor Fan may be stopped in the Soft Dry M...

Page 42: ...rating circuit of the Vertical Louver Confirm that there is DC 12V between pin RED of CN U D CN L R and GND Confirm that there is a soldering short at following terminals Between 62 61 60 and 59 of MICOM Between 57 56 55 and 54 of MICOM Between 51 50 49 and 48 of MICOM Between 1 2 3 4 and 5 of CN U D CN L R If there are no problems after above checks Confirm the assembly conditions that are catchi...

Page 43: ...ntroller then taking above 2 minutes Apply the power again after about 10 seconds by the power of Outdoor unit is off Check for the communication error and the operating condition of product after also operating with the remote controller then taking above 2 minutes Check the PWB assembly of Indoor and Outdoor unit Caution If the connecting wires of Indoor and Outdoor unit are not connected within...

Page 44: ... controller The operation indicator blinks once on for 0 5 second off for 3 seconds The compressor operates continuously regardless of the setting temperature and the variation of room temperature The operation indicator blinks once on for 0 5 second off for 3 seconds Continuous operation The operation indicator blinks once The compressor and the outdoor fan stop The indoor fan speed is low The in...

Page 45: ...n the Outdoor unit are damaged when the indoor fan is operated No power for Indoor unit The signal input of the remote controller and opera tion of product is impossible The RED indicator of the Outdoor unit blinks 5 times after 2 minutes with applying the power All functions stop The operation with the remote controller forced and test one do not operate The only signal of remote controller opera...

Page 46: ...5 0 5 5 0 0 5 0 5 0 5 0 5 5 0 0 5 0 5 0 5 0 5 5 0 1 2 0 12 0 12 0 12 0 12 0 12 0 12 0 12 0 12 0 12 0 12 0 12 0 12 0 12 0 12 0 12 0 12 0 12 0 12 0 12 0 12 3 2 17 0 17 0 17 0 17 0 17 0 17 0 17 0 17 0 17 0 17 0 17 0 17 0 17 0 17 0 17 0 17 0 17 0 17 0 17 0 17 0 4 2 28 6 25 6 22 2 20 0 0 0 35 7 30 7 25 1 21 2 0 0 32 0 27 8 24 1 21 2 0 0 35 7 33 3 29 4 24 2 0 0 1 2 0 12 0 12 0 12 0 12 0 12 0 12 0 12 0 1...

Page 47: ...E PIPE TH ROOM TH STEP MOTOR 6 2K 12 1K R05H 10K 1 1 2 2 1 1 R02H R04H 5V 5V receiver CN TH1 WH 3 4 3 4 CN LR2 WH L R 2 STEP MOTOR RD 12V RD YL OR PK 1 BL CN LR1 WH BL 3 4 4 5 OR PK YL L R 1 STEPPING MOTOR RD PK BL YL OR SUB PCB ASM 5V HVB 7 8 12 11 11 11 12 5V 10 9 8 7 6 5 4 3 2 1 8 9 10 1 2 3 4 5 6 7 7 6 5 4 3 2 10 9 8 1 9 8 7 6 5 4 3 2 1 9 8 7 6 5 4 3 2 1 1 2 3 4 5 6 7 8 9 HVB PIN1 10 11 12 13 ...

Page 48: ... 4WAY HEATER RY 4WAY G5N 1A RY HEATER RY FAN G5N 1A COIL2 LS404060 CN 4WAY CN FAN 3 4 3 4 1 1 3 1 3 1 GMS81C1408SK HYUNDDAI 8K TMR20V RB7 SRDYIN SRDYOUT RC3 AN0 Aref RB0 PWM0 COMP0 RB4 PWM1 COMP1 RB5 R97 1K RY HEATER RY COMP RY FAN R96 620 RY 4WAY 10 6 100V 102J C72 R73 13K 1 1 6 04K 22 51 1K 2 4 5 L61 L62 FMX12S L63 L64 D62 11 ST1 2 100Uf R72 11K 1 C71 25V 10 2K 1 LED92 7 21 5K 39 2K 35 7K 11 4 3...

Page 49: ... BR BL RD BR BL TERMINAL BLOCK TO INDOOR UNIT POWER INPUT 3854A30077Z OUTDOOR WIRING DIAGRAM RD BR BK BL G H F C CAPACITOR CN TRANS TRANSFORMER T B 1 CN POWER BR BR YL O L P COMP S R C N L Indoor Unit Outdoor Unit 9K 12K 9K 12K Cooling Only Models Cooling Heating Models Schematic Diagram Wiring Diagram ...

Page 50: ...ng Model 6871A20387G OPEN 15K OPEN OPEN OPEN OPEN 2 9K Cooling Model 6871A20387G OPEN 15K OPEN OPEN OPEN OPEN NO MODEL P No OPTIONAL FUNCTION OR1H OR2H OR3H OR4H OR5H OR6H OJ1H Short OJ2H OJ3H OJ4H OPEN TOP VIEW BOTTOM VIEW Electric Control Device Components Location Schematic Diagram ...

Page 51: ...39K X X X X X X 2 9K Cooling Model 6871A10036R 5 1K 12K 56K 56K OPEN X X X X X X MAIN PWB ASSY Outdoor Unit PWB ASSY SVC PART LIST NO MODEL P No OPTIONAL FUNCTION OR4H OR5H OR6H OR7H OR 8H FUSE RY HEATER RY 4WAY RY FAN CN 4WAY CN FAN CN TH 125V 3 15A Schematic Diagram ...

Page 52: ...C N D 6 1 1 1 1 CN D8 1 1 1 1 CN D7 1 1 CN D4 1 C N D 3 CN D1 1 CN D3 C N D 1 1 C N D 2 CN D2 1 1 C N D 4 1 CN 12V WH CN SW BL C N 1 2 V W H C N S W B L 1 1 1 1 C01V P W B A S M 6 8 7 1 A 2 0 3 6 3 P W B 6 8 7 0 A 9 0 1 2 6 A PWB ASM 6871A20363 PWB 6870A90126A C02V C 0 1 V C 0 2 V Schematic Diagram 6871A20462 TOP VIEW BOTTOM VIEW ...

Page 53: ...Remocon Type Wireless LCD Wireless LCD Setting Temperature Range Cooling Mode 64 86 F 64 86 F Temperature Increment 2 F 2 F Auto Operation electronic control Yes Yes Self Diagnosis Yes Yes Timer 24hr On Off 24hr On Off Sleep Operation Yes Yes Healthy Dehumidification Mode Yes Yes Restart Delay minutes 3 3 Refrigerant R 22 Charge g oz 740 26 1 630 22 2 Power cord AWG P mm2 14 3 2 5 14 3 2 5 Fuse or...

Page 54: ...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 55: ...Service Manual 55 Exploded View Outdoor unit 550140 554160 567502 552116 561410 553000 552111 437210 559010 546810 554031 261704 W0CZZ 430410 552203 3 552203 1 437212 435511 552202 649950 668711 ...

Page 56: ...1R 4995A20291R R 263230 THERMISTOR ASSEMBLY 6323A20004N 6323A20004N R 267110 REMOTE CONTROLLER ASSEMBLY 6711A20083R 6711A20083R R 268712 PWB PCB ASSEMBLY DISPLAY 6871A20462B 6871A20462B R 268714 PWB PCB ASSEMBLY MAIN 6871A20387G 6871A20387G R 330870 DRAIN PAN ASSEMBLY 3087A30004A 3087A30004A R 346810 MOTOR ASSEMBLY INDOOR 4681A20047B 4681A20047B R 349600 MOUNT MOTOR 4960A20016A 4960A20016A R 35211...

Page 57: ...BARRIER ASSEMBLY OUTDOOR 4791A30002F 4791A30002F R 546810 MOTOR ASSEMBLY OUTDOOR 4681A20004R 4681A20004R R 550140 ISOLATOR COMP 4H00982E 4H00982E R 552111 TUBE ASSEMBLY CAPILLARY 5211A20133X 5211A20095J R 552203 1 VALVE SERVICE 5220A20005B 5220A20005B R 552203 2 VALVE SERVICE 2H01890L 5220A20003B R 554031 CONDENSER ASSEMBLY BENT 5403A20026D 5403A20019B R 554160 COMPRESSOR SET 2520UKAC2HA 2520UKWC2...

Page 58: ...P No 3828A20135Z Printed in Korea ...

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