LG A2UC243FA0 (LMU240CE) Service Manual Download Page 1

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Multi Type 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.

MODEL

• Indoor Unit:

• Outdoor Unit: A3UH363FA0(LMU360HE)

A3UC363FA0(LMU360CE)

Room Type

AMNH093D4A0(LMN090HE)
AMNC093D4A0(LMN090CE)
AMNH123DEA0(LMN120HE)
AMNC123DEA0(LMN120CE)

AMNH093APM0(LMAN090HNS)
AMNC093APM0(LMAN090CNS)
AMNH123APM0(LMAN120HNS)
AMNC123APM0(LMAN120CNS)

Art Cool Type

Summary of Contents for A2UC243FA0 (LMU240CE)

Page 1: ...ECAUTIONS IN THIS MANUAL ONLY FOR AUTHORIZED SERVICE PERSONNEL MODEL Indoor Unit Outdoor Unit A3UH363FA0 LMU360HE A3UC363FA0 LMU360CE Room Type AMNH093D4A0 LMN090HE AMNC093D4A0 LMN090CE AMNH123DEA0 LMN120HE AMNC123DEA0 LMN120CE AMNH093APM0 LMAN090HNS AMNC093APM0 LMAN090CNS AMNH123APM0 LMAN120HNS AMNC123APM0 LMAN120CNS Art Cool Type ...

Page 2: ...t the cable to the Outdoor unit 31 Connection method of the connecting cable Example 32 Connect the cable to the indoor unit 33 Checking the Drainage Forming the Pipings and Long Pipe Setting 34 Checking the drainage 34 Forming the piping 35 Air Purging and Evacuation 36 Checking method 36 Evacuation 37 Charging 38 Test Running 39 Operation 40 Function of control 40 Function of Indoor Unit 45 Func...

Page 3: ...look type M M look type N N look type Artcool type A standard wide type D Deluxe type B Ceiling Concealed Duct V Ceiling Floor Convertible Function A Basic L Nano Plasma Auto Clean Wall Mounted C Plasma Ceiling Cassette G Low Static Motor ART COOL DELUXE Type Front Panel Color B Blue D Wood M Metal R Mirror W White R 410A MPS Variable Multi System Outdoor Unit And No of Connectable Indoor Units Ex...

Page 4: ... 0 2 6 9 12 12 33 9000 12000 12000 33000 3650 16 5 9 0 9000 12000 12000 33000 3340 15 0 9 9 2 9 12 12 12 36 12000 12000 12000 36000 3680 16 6 9 8 12000 12000 12000 36000 3340 15 0 10 8 3 2 1 UNIT COP Operation Combination k Btu Cooling 2 UNIT 3 UNIT Heating Capacity Btu h Input W Current A EER Btu h w Capacity Btu h Input W Current A Notes 1 Cooling Capacity is based on indoor temp 26 7 C 80 1 F D...

Page 5: ...ation Be sure not to do Be sure to follow the instruction Do not use a defective or under rated circuit breaker Use this appliance on a dedicated circuit There is risk of fire or electric shock For electrical work contact the dealer seller a qualified electrician or an Authorized Service Center Do not disassemble or repair the product There is risk of fire or electric shock Always ground the produ...

Page 6: ... fire electric shock explosion or injury Do not install the product on a defective installation stand It may cause injury accident or damage to the product Be sure the installation area does not deteriorate with age If the base collapses the air condi tioner could fall with it causing property damage product failure and personal injury Do not let the air conditioner run for a long time when the hu...

Page 7: ...s on or off There is risk of explosion or fire If strange sounds or small or smoke comes from product Turn the breaker off or discon nect the power supply cable There is risk of electric shock or fire Stop operation and close the window in storm or hurricane If possible remove the prod uct from the window before the hurricane arrives There is risk of property damage failure of product or electric ...

Page 8: ...fire or electric shock Turn the main power off when cleaning or maintaining the product There is risk of electric shock When the product is not be used for a long time dis connect the power supply plug or turn off the breaker There is risk of product damage or failure or unintend ed operation Take care to ensure that nobody could step on or fall onto the outdoor unit This could result in personal ...

Page 9: ...y cause a problem for your neighbors Use two or more people to lift and transport the product Avoid personal injury Do not install the product where it will be exposed to sea wind salt spray directly It may cause corrosion on the product Corrosion particularly on the condenser and evaporator fins could cause product malfunction or inefficient operation Do not expose the skin directly to cool air f...

Page 10: ...onal injury Do not drink the water drained from the product It is not sanitary and could cause serious health issues Use a firm stool or ladder when cleaning or maintaining the product Be careful and avoid personal injury Replace the all batteries in the remote control with new ones of the same type Do not mix old and new batteries or dif ferent types of batteries There is risk of fire or explosio...

Page 11: ...it 1 Split Type Indoor 2 Art Cool Type Indoor Unit Pipe Hole Fix Hole Hanger Hole H W D Installation plate D H W W mm 840 895 570 H mm 270 282 568 D mm 153 165 129 Model Dimension Split Type ARTCOOL Type S4 SE 9 kBtu h 12 kBtu h 9 kBtu h 12 kBtu h SP3 ...

Page 12: ...L4 H L5 W D L1 L3 L2 L10 L11 L11 L11 L11 L11 Gas side 3 way valve Liquid side 2 way valve Dimensions UE2 36k MODEL DIM W mm 870 H mm 1038 D mm 320 L1 mm 360 L2 mm 340 L3 mm 25 L4 mm 1035 L5 mm 25 L6 mm 546 L7 mm 160 L8 mm 160 L9 mm 44 L10 mm 64 5 L11 mm 50 ...

Page 13: ...3 8 9 52 3 8 9 52 3 8 9 52 20 20 20 20 35 7 13 1 8 8 906 332 223 35 7 13 1 8 8 906 332 223 38 3 9 1 14 6 973 231 372 38 3 9 1 14 6 973 231 372 440 910 1091 440 910 1091 353 719 792 353 719 792 2 267 2 637 2 267 2 637 3 023 3 516 3 023 3 516 9 000 9 000 12 000 12 000 2 267 2 637 3 023 3 516 9 000 12 000 7 5 264 7 5 264 8 5 300 8 5 300 18 30 16 30 18 30 16 30 24 24 24 24 DL 89812LGIB DL 89812LGIB DL...

Page 14: ...otor Model Output W Capacitor µF Vac Fan Type No Used Diameter EA inch mm Discharge Side Top Air Circulation Outdoor CMM CFM Noise Level H L at 230V Sound Press 1m dB A 1 SVC Valve Liquid inch mm Gas Dimensions W H D inch mm Net Weight Outdoor kg lbs Max Interunit Piping Length Total of Each Room m For One Room m Max Installation Indoor Unit Outdoor Unit m Height Difference Indoor Unit Indoor Unit...

Page 15: ...Holder Installation plate Figure Figure Name Screw driver Electric Drill Measuring Tape Knife Hole Core Drill Spanner Torque wrench Ohmmeter Hexagonal wrench Ammeter Gas Leak Detector Thermometer Level Flaring Tool Set Name Installation Parts Installation Tools Read carefully and then follow step by step ...

Page 16: ...and side of the unit 3 Do not place animals and plants in the path of the warm air 4 Take the air conditioner weight into account and select a place where noise and vibration are mini mum 5 Select a place so that the warm air and sound from the air conditioner do not disturb neighbors Rooftop Installations If the outdoor unit is installed on a roof structure be sure to level the unit Ensure the ro...

Page 17: ...ft Multi Piping Type 36k 45m 150ft 15m 50ft 3m 10ft 7 5m 25ft 7 5m 25ft Capacity Btu h Max total length of all pipes A B A B C Max length of each pipe A B C Min length of each pipe A B C Max Elevation between each indoor unit and out door unit h1 Max elevation between indoor units h2 9K 3 8 1 4 7 5m 25ft 20g m 0 32oz ft 12K 3 8 1 4 7 5m 25ft 20g m 0 32oz ft Gas Liquid Standard Length Additional Re...

Page 18: ... a level 2 Measure the wall and mark the centerline It is also important to use caution concerning the location of the installation plate routing of the wiring to power outlets is through the walls typically Drilling the hole through the wall for piping connections must be done safely Fixing Installation Plate Standard Type Installation Plate Type A screw Chassis Hook Installation plate Left rear ...

Page 19: ... screws for fixing cover pipe 2 Pull up the cover side of desired connecting direction then cover side is separated 3 In case of connecting direction is left or right path through the hole of cover side CAUTION After removing the pipe hole cut the burr for safety When connecting pipe path through rear wall don t remove the hole NOTICE Drain hose junction 1 Remove the rubber stopple of desired dire...

Page 20: ... upper screws In this time Remove the map Falling attention 5 Check the fixed product with light power 6 Look at suited horizon by horizontal meter on the horizontal setting line and Fix lightly the map by adhesive tape 7 Drill the piercing part for connecting pipe as diameter 50mm In case of piercing rear surface Refer to No 5 on this page when making a hole in the wall 8 First Drive the two poin...

Page 21: ...ection of pipe tube 2 Put the end of the copper tube pipe in a downward direction as you remove burrs in order to avoid dropping burrs 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 Carry out flaring work using flaring tool as shown below Firmly...

Page 22: ... hole Do not connect the cable to the indoor unit Make a small loop with the cable for easy connection later 3 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 uper side can cause drain pan to overflow inside the unit If the drain hose is routed inside the room insulate the hose with an insulation material s...

Page 23: ...tall the drain pipe Wrap the insulation material around the connecting por tion 1 Overlap the connection pipe insulation material and the indoor unit pipe insulation material Bind them together with vinyl tape so that there may be no gap 2 Wrap the area which accommodates the rear piping hous ing section with vinyl tape 3 Bundle the piping and drain hose together by wrapping them with vinyl tape f...

Page 24: ...te Insert the spacer etc between the indoor unit and the installation plate and separate the bottom of the indoor unit from the wall Connecting the piping to the indoor unit and the drain hose to drain pipe 1 Align the center of the pipes and sufficiently tighten the flare nut by hand 2 Tighten the flare nut with a wrench 3 When extending the drain hose at the indoor unit install the drain pipe Fo...

Page 25: ...ey fit into the rear piping housing section Reroute the pipings and the drain hose across the back of the chassis Indoor unit installation 1 Remove the spacer 2 Ensure that the hooks are properly seated on the installa tion plate by moving it left and right 3 Press the lower left and right sides of the unit against the installation plate until the hooks engage into their slots clicking sound Plast...

Page 26: ...Cool Type only 1 First Check the side cover assembly exactly Fix power cord in the bottom groove of cover side left 2 Assemble connecting lead wire with controller and first fix the upper part of panel front then match the lower part of panel front 3 Drive two screws Panel Front Connector ...

Page 27: ...r left piping Follow the instruction below Good case Press on the upper side of clamp and unfold the tubing to downward slowly Bad case Following bending type from right to left may cause damage to the tubing Flaring Work and Connection of Piping ...

Page 28: ... correct Be sure that both batteries are new Re attach the cover Slide it back into position REMOTE CONTROL PREPARATION OPTIONAL HOW TO MOUNT ONTO A WALL HOW TO INSERT BATTERIES Do not use rechargeable batteries such batteries differ from standard dry cells in shape dimensions and per formance Romove the batteries from the remote controller if the air conditioner is not going to be used for some l...

Page 29: ...and Finally tighten the flare nut with 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 Outdoor unit Torque wrench Liquid side piping B UNIT C UNIT A UNIT Gas side piping Outside diameter Torque mm inch kg m Ø6 35 1 4 1 8 Ø9 52 3 8 4 2 ...

Page 30: ... Be sure to connect wires according to the wiring diagram Connect the wires firmly so that not to be pulled out easily Connect the wires according to color codes by referring to the wiring diagram RECOMMAND Provide a circuit breaker between power source and the outdoor unit as shown below RECOMMAND The power cord connected to the outdoor unit should be complied with the following specifications ET...

Page 31: ...example Type SJO WA WARNING Be sure to comply with local codes while running the wire from the indoor unit to the outdoor unit size of wire and wiring method etc Every wire must be connected firmly No wire should be allowed to touch refrigerant tubing the compressor or any moving parts NOTICE Outdoor unit Over 5mm Holder for power supply cord Connecting cable Cover control Terminal block Power sup...

Page 32: ...ollow instructions How to connect wiring to the terminals and fasten the wire tightly with the fixing screw of the terminal plate How to connect wiring to the terminals For strand wiring 1 Cut the wire end with a wire cutter or wire cutting pliers then strip the insulation to expose the strand wiring about 10mm 3 8 2 Using a screwdriver remove the terminal screw s on the terminal plate 3 Using a r...

Page 33: ...wires to the terminals on the control board individually according to the outdoor unit connection Ensure that the color of the wires of outdoor unit and the terminal No are the same as those of indoor unit respec tively 2 Attach the Grille onto the cabinet Grasp the lower left and right side of the Grille and engage four tabs on the top inside edge of the chassis Press the Grille toward the chassi...

Page 34: ...gh the drain hose of the indoor unit without any leakage and goes out the drain exit Drain piping 1 The drain hose should point downward for easy drain flow 2 Do not make drain piping Downward slope Do not raise Accumulated drain water Tip of drain hose dipped in water Air Waving Water leakage Water leakage Ditch Less than 50mm gap Water leakage Checking the Drainage Forming the Pipings and Long P...

Page 35: ...rain hose and connecting cable from down to up 2 Secure the tapped piping along the exterior wall using saddle or equivalent In cases where the Outdoor unit is installed above the Indoor unit perform the following 1 Tape the piping and connecting cable from down to up 2 Secure the taped piping along the exterior wall Form a trap to prevent water entering the room 3 Fix the piping onto the wall by ...

Page 36: ... to this service port with charge hoses CAUTION Be sure to use a manifold valve for leak testing The high side manifold valve must always be kept closed Pressurize the system to no more than 150 P S I G with dry nitrogen gas and close the cylinder valve when the gauge reading reached 150 P S I G Next test for leaks with liquid soap CAUTION To avoid nitrogen entering the refrigerant system in a liq...

Page 37: ...gas side valve counter clockwise to fully open the valve 3 Loosen the charge hose connected to the gas side service port slightly to release the pressure then remove the hose 4 Replace the flare nut and its bonnet on the gas side ser vice port and fasten the flare nut securely with an adjustable wrench This process is very important to pre vent leakage from the system 5 Replace the valve caps at b...

Page 38: ...20g 0 22oz of R 410A per meter foot Example A 80ft line set is used for tri zone 5 additional ft X 0 22 ounces per foot add 1 1 ounces of R 410A Important If you are ever uncertain of the unit charge reclaim evacuate and weigh in the correct charge using the unit nameplate charge adjusting for line sets longer or shorter than 7 5m 25ft for each indoor unit Charging 36k 45m 150ft 15m 50ft 3m 10ft 7...

Page 39: ...s later auto matically The test run is started by pressing timer cancel button five times continuously Room type To cancel the test run press any button 3 Settlement of outdoor unit Anchor the outdoor unit with a bolt and nut ø10mm tightly and horizontally on a concrete or rigid mount When installing on the wall roof or rooftop anchor the mounting base securely with a nail or wire assuming the inf...

Page 40: ...put by the remote control is received the intake air temperature is detected and the setting temp is automatically set according to the intake air temperature 26 C 78 8 F Intake Air Temp 25 C 77 F 24 C 75 2 F Intake Intake Air Temp 26 C 78 8 F Intake Air Temp 1 C 30 2 F 18 C 64 4 F Intake Intake Air Temp 24 C 75 2 F Intake Air Temp 0 5 C 31 1 F Intake Air Temp 18 C 64 4 F 18 C 64 4 F While compres...

Page 41: ... air temp at that moment as follows 24 C 75 2 F Inatake Air Temp Fuzzy Operation for Cooling 21 C 69 8 F Inatake Air Temp 24 C 75 2 F Fuzzy Operation for Dehumidification Inatake Air Temp 21 C 69 8 F Fuzzy Operation for Heating If any of the operation modes among cooling dehumidification heating mode operations is carried out for 10 sec or longer before Fuzzy operation the mode before Fuzzy operat...

Page 42: ...hen below the setting temp the compressor is turned on Compressor ON Temp Setting Temp Compressor OFF Temp Setting Temp 3 C 37 4 F At the beginning of Fuzzy mode operation the setting temperature is automatically selected according to the intake air temp at that time 20 C 68 F Intake Air Temp Intake Air Temp 0 5 C 32 9 F Intake Air Temp 20 C 68 F 20 C 68 F When the Fuzzy key Temperature Control ke...

Page 43: ...Swing or they are fixed to the desired direction While in Chaos Swing mode the angles of cooling and heating cycle operations are different Chaos Natural Wind Mode When the Chaos Natural Wind mode is selected and then operated the high medium or low speed of the air flow mode is operated for 2 15 sec randomly by the Chaos Simulation Jet Cool Mode Operation While in heating mode or Fuzzy operation ...

Page 44: ...position is switched from the forced operation position to the Auto Restarting position or the remote control position the forced operation is canceled and the appliance stops operating In the forced operation mode the indoor fan is operated at low speed for around 15 sec and then the opera tion condition is set according to the intake air temperature as follows 24 C 75 2 F Intake Air Temp Cooling...

Page 45: ...ing Temp Indoor fan is delayed for 5 seconds at the starting Restarting is delayed for approx 3 minutes High Med Low Chaos Jet Cool Intermittent operation of fan at low speed The fan is switched to low Cooling med Heating speed The unit will be stopped after 1 2 3 4 5 6 7 hours The fan is switched to intermittent or irregular operation The fan speed is automatically switched from high to low speed...

Page 46: ...on Mode The function will be operated while in any operation mode with selecting the function The function is to be stopped while it is operating with selecting the function Both the indoor and outdoor fan stops dur ing defrosting The indoor fan stops until the evaporator pipe temperature will be reached at 28 C 82 4 F Sleep Mode Auto Control Natural Air Control by CHAOS Logic Airflow Direction Co...

Page 47: ...g Defrost Function After 45 min heating operation check the defrost condition and if outdoor pipe temp is below 5 C 23 F and released from deice operation in case outdoor pipe temp is over 12 C 53 6 F or 9 min cooing mode To deice outdoor heat exchanger in low temp condtion convert operating mode from heating to Oil Return System In single one comp operation duration another comp will operate for ...

Page 48: ...Used to stop or start louver movement and set the desired up down airflow direction ON OFF TIMER BUTTONS Used to set the time of starting and stopping operation TIME SETTING BUTTONS Used to adjust the time TIMER SET CANCEL BUTTON Used to set the timer when the desired time is obtained and to cancel the Timer operation SLEEP MODE AUTO BUTTON Used to set Sleep Mode Auto operation AIR CIRCULATION BUT...

Page 49: ...o remove the Grille from the Chassis Set the up and down air discharge louver to open position horizontally by finger pressure Remove the securing screws To remove the Grille pull the lower left and right side of the grille toward you slightly tilted and lift it straight upward 1 Before removing the control box be sure to take out the wire screwed at the other end Earth Conductor ...

Page 50: ...t 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 To remove the Evaporator Remove 3 screws securing the evaporator at the left 2EA in the Eva Holder at the right 1EA Screw When repair do not damage the Caution label ...

Page 51: ... Remove 2 securing screw Pull the motor cover out from the chassis carefully 6 To remove the Cross Flow Fan Loosen the screw securing the cross flow fan to the fan motor do not remove Lift up the right side of the cross flow fan and the fan motor separate the fan motor from the cross flow fan Remove the left end of the cross flow fan from the self aligning bearing Motor cover Bearing Cross flow fa...

Page 52: ...s of 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 Fa...

Page 53: ...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 brack et Top Cover Pipe Cover Air Guide Turbo Fan Bracket Bolt Motor Mount ...

Page 54: ...54 Multi type Air Conditioner Schematic Diagram Schematic Diagram Electronic Control Device 1 Indoor Unit 1 Split Type ...

Page 55: ...3AGC 0IMCRNE002M CN UD BL 1 2 3 4 5 R01E 1K 12V R02E 20 PKM13EPP 4002 BZ01E 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...

Page 56: ...56 Multi type Air Conditioner Schematic Diagram 2 Outdoor Unit ...

Page 57: ...Service Manual 57 Schematic Diagram ...

Page 58: ...58 Multi type Air Conditioner 1 Room Type Indoor Unit S4 SE chassis 2 Art Cool Type Indoor Unit Wiring Diagram Schematic Diagram 3 Outdoor Unit 1 A3UH363FA0 LMU360HE 2 A3UC363FA0 LMU360CE ...

Page 59: ...Service Manual 59 Schematic Diagram 1 Indoor Unit MAIN P C B ASM 1 Split Type Components Locations TOP VIEW BOTTOM VIEW PCB 6870A90409B ASSY 6871A20771 6871A20782 ...

Page 60: ...60 Multi type Air Conditioner Schematic Diagram 2 Art Cool Type TOP VIEW BOTTOM VIEW ...

Page 61: ...Service Manual 61 Schematic Diagram 2 Display ASSEMBLY 1 Split Type 6871A20680 2 Art Cool Type 6871A20462 BOTTOM VIEW TOP VIEW ...

Page 62: ...62 Multi type Air Conditioner Schematic Diagram 3 Outdoor Unit 1 Component side ...

Page 63: ...Service Manual 63 Schematic Diagram 2 Solder side ...

Page 64: ...mpressor Constant Compressor Accumulator Refrigerant Flow Cooling Heating Th1 Discharge thermistor Th2 Discharge thermistor Th3 Outdoor temperature thermistor Th4 Defrost thermistor Field Piping Gas Field Piping Liquid Room A LEV B LEV A Heat Exchanger Header OUTDOOR UNIT Room B Ø9 52 Room A Room B Ø6 35 Ø6 35 Ø9 52 Room C Ø9 52 Th2 High pressure S W Th3 Th4 Th1 LEV C Room C Ø6 35 Constant Compres...

Page 65: ...f error code is different from Model Self diagnosis Function 00 No Error ON 01 Indoor Room Thermistor Error 1 time OFF 02 Indoor In Piping Error 2 times OFF 05 Communication Error between In and Out 5 times OFF 06 Indoor Out Piping Error 6 times OFF 07 Differnt mode operation 7 times OFF 10 Indoor fan motor locked error 1 times OFF Error code Description MPS Variable LED1 LED2 Indoor Status 33 D P...

Page 66: ...e 1 The suction pressure is usually 4 5 6 0 kg cm2 G at normal condition 2 The temperature can be measured by attaching the thermometer to the low pressure tubing and wrap it with putty Temp difference approx 0 C 32 F Current less than 80 of rated current Temp difference approx 8 C 46 4 F Current less than 80 of rated current Temp difference less than 8 C 46 4 F Current near the rated cur rent Tem...

Page 67: ...AC230V 60Hz The voltage of main power The voltage applied to the unit The connecting method of Indoor Outdoor connecting cable each color The P W B Ass y Fuse Noise Filter Power Transformer IC01D IC02D etc Trouble 1 NO YES The operation check of the P C B Ass y Procedure 1 The input voltage of power trans former 2 The output voltage of power transformer 3 IC01D 7812 4 IC02D 7805 5 IC01A KIA7036 Sp...

Page 68: ...he Sleeping Mode the wind speed is set to the low speed as force Caused by the remote controller Caused by other parts except the remote controller When the mark is displayed in LCD screen replace battery Check the contact of CN DISP 1 connector When the detect switch double key inside the remote controller door is fault it is impossible to operate temperature regulating and wind speed selecting C...

Page 69: ...Outdoor fan is stopped Check the related circuit of R01H 1K R02H 1K R03H 1K R04H 1K Micom pin No 74 75 76 77 Check the Indoor temperature sensor is disconnected or not about 10K at 25 C Check the Relay RY PWR RY START for driving Compressor Check the voltage between brown and blue cable of terminal to connect the Outdoor About AC208V 230V Check the related circuit of relay in Outdoor PCB Ass y Ope...

Page 70: ...it PWB 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 69 Check the motor of Indoor Fan Indoor Fan may be stopped in the Soft ...

Page 71: ...onnector Check the soldering condition on PWB of CN UP DOWN Connector Check the operating circuit of the Vertical Louver Confirm that there is DC 12V between pin RED of CN UP DOWN and GND Confirm that there is a soldering short at following terminals Between 60 61 62 and 63 of MICOM Between 2 3 4 and 5 of IC01M Between 12 13 14 15 of IC01M Between 1 2 3 4 and 5 of CN UP DOWN If there are no proble...

Page 72: ...nplugged Normal voltage 2 5Vdc at 25 C plugged Normal resistor 5KΩ at 25 C Unplugged Normal voltage 2 5Vdc at 25 C plugged Ω 10KΩ 2 5Vdc Check the resistance voltage V Check Point 1 Unplug the sensor on Indoor unit PCB 2 Estimate the resistance of each sensor 3 If the resistance of the sensor is 10KΩ 5KΩ at 25 C then sensor is normal 4 If the resistance of the sensor is 0 KΩ or then sensor is abno...

Page 73: ... PCB is abnormal Transmission circuit of indoor PCB is abnormal Check Point 1 Check the input power AC 230V Outdoor Indoor 2 Check the communication wires are correctly connected Adjust the connection of wire Confirm the wire of Live Neutral 3 Check the resistance between communication line and GND Normal Over 2MΩ 4 Check the connector for communication is correctly connected 5 Check the connectio...

Page 74: ...tion code 51 Capacitor error Over Capacitor com bination Check the indoor unit capacity Check the combination table Check Point 1 Check the indoor unit capacity 2 Check the combination table In the tropical model case single cycle has no error for over capacity Check Point 1 Check the install condition for over load 2 Check the SVC V V open 3 Check the leakage of refrigerent 4 Check the constant c...

Page 75: ...d poorly Internal circuit error Normal resistor 10KΩ at 25 C 77 F Unplugged Normal voltage 2 5Vdc at 25 C 77 F plugged Normal resistor 5KΩ at 25 C 77 F Unplugged Normal voltage 2 5Vdc at 25 C 77 F plugged Normal resistor 200KΩ at 25 C 77 F Unplugged Normal voltage 4 5Vdc at 25 C 77 F plugged Check Point 1 Estimate the resistance of each sensor Unplugged 2 Estimate the voltage of each sensor Plugge...

Page 76: ...cap with cap Pumping down Closed Open Open Transfering clockwise counter clockwise connected manifold gauge Evacuation Open Open Open Servicing with charging cylinder Gas charging Open Open Open Servicing with charging cylinder Pressure check Open Open Open Servicing with charging cylinder Gas releasing Open Open Open Servicing with charging cylinder 3 2 1 4 5 6 Flare nut To piping connection Open...

Page 77: ...from the hose 5 Set the liquid side 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 gas side valve to the closed position Do this quickly so that the gauge ends up indicat ing 1kg g 8 Disconnect the charge set and mount the liquid side and gas side valve caps and the service port nut Use torque wre...

Page 78: ...le has moved toward 76 cmHg vacuum of 4 mmHg or less 5 Close the Low handle of the gauge turn off the vacuum pump and confirm that the gauge needle does not move approximately 5 minutes after turning off the vacuum pump 6 Disconnect the charge hose from the vacuum pump Vacuum pump oil If the vacuum pump oil becomes dirty or deplet ed replenish as needed 7 Mount the valve caps and the service port ...

Page 79: ...ioner 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 gas side 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 turn off the air conditioner before d...

Page 80: ... 1 342800 263230 2 263230 1 359011 131410 733010 135311 135312 159901 268712 146811 147582 346810 135516 35211B 354210 249951 352150 268714 668713 267110 135500 Exploded View Replacement Parts List Exploded View Replacement Parts List Indoor Unit S4 SE chassis ...

Page 81: ...R2295L 4681AR2295L R 152313 FILTER ASSEMBLY DEODORIZER 5231A20040A 5231A20040A 5231A20040K 5231A20040K R 249951 CASE ASSEMBLY CONTROL INDOOR 4995A20831A 4995A20831A 4995A20831A 4995A20831A R 268714 PCB ASSEMBLY MAIN 6871A20782A 6871A20782A 6871A20782A 6871A20782A R 668713 PCB ASSEMBLY OPTION PCB 6871A20989A 6871A20989D 6871A20989B 6871A20989C R 263230 1 THERMISTOR NTC 6323AQ3226T 6323AQ3226T 6323A...

Page 82: ... List 135515 267110 135500 3 268714 352150 35211B 263230 2 147581 359012 349600 352380 146811 146811 147581 346810 147581 268712 135500 1 131410 354210 263230 1 135500 2 146811 268717 1 268717 2 330870 135312 146811 135314 159830 249951 SP3 Chassis Art Cool Type ...

Page 83: ...A20014B R 146811 MOTOR DC 4681A20055A 4681A20055A 4681A20055A 4681A20055A R 159830 FILTER ASSEMBLY AIR CLEANER 5983A20007F 5983A20007F 5983A20007F 5983A20007F R 249951 CASE ASSEMBLY CONTROL INDOOR 4995A20832B 4995A20832A 4995A20832D 4995A20832C R 268714 PCB ASSEMBLY 6871A20387K 6871A20387M 6871A20387M 6871A20387N R 263230 2 THERMISTOR NTC ROOM IN PIPE 6323A20004N 6323A20004N 6323A20004N 6323A20004...

Page 84: ...552203 1 552203 2 554160 2 554160 1 567502 554031 447910 430410 435512 135301 437211 137213 2 137213 1 135314 548490 552112 552113 552117 561411 1 561411 2 561411 3 263230 1 263230 2 649950 668711 2 668711 1 W0CZZ 1 W0CZZ 2 435511 561410 A3UH363FA0 LMU360HE A3UC363FA0 LMU360CE Outdoor Unit ...

Page 85: ...11A11010A R 552113 TUBE ASSEMBLY CONDENSER OUT 5211A12001A 5211A12001A R 552116 TUBE ASSEMBLY REVERSING AJR30111101 AJR30111101 R 552117 TUBE ASSEMBLY SUCTION OUTDOOR AJR30125001 AJR30125001 R 554031 CONDENSER ASSEMBLY BENDING 5403A20168A 5403A20168C R 559010 FAN ASSEMBLY PROPELLER 5901A10033A 5901A10033A R 561410 COIL ASSEMBLY REVERSING VALVE 3A02028Z R 649950 CASE ASSEMBLY CONTROL OUTDOOR 4995A0...

Page 86: ...P No 3828A20474C May 2006 Printed in Korea ...

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LG A2UC243FA0 (LMU240CE), Service Manual

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