LG LT-E2460FA Service Manual Download Page 1

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Ceiling Cassette
Air Conditioner

SERVICE MANUAL

MODELS: LT-E2460FL/LT-E2460FA

LT-E2460RL/LT-E2460RA

Summary of Contents for LT-E2460FA

Page 1: ...Ceiling Cassette Air Conditioner SERVICE MANUAL MODELS LT E2460FL LT E2460FA LT E2460RL LT E2460RA ...

Page 2: ...le Diagram 8 Wiring Diagram 9 Operation Details 10 Installation of Indoor Outdoor Unit 13 2 way Valve 3 way Valve 28 Cycle Troubleshooting Guide 33 Electronic Parts Troubleshooting Guide 34 Electronic Control Device 37 Schematic Diagram 38 Exploded View and Replacement Parts List 39 2 ...

Page 3: ...High Ceilingcorresponding Function According to the height of ceiling the RPM of indoor fan motor is selectable to increase air reaching distance Central Control Optional It is operating individually or totally by central control function Group Control Optional Wiring Each controller can control 16 units and 8 controllers can connect It operates maximum 16 units by only one wired remote con trolle...

Page 4: ... Cooling model only Heating model only Low Med High Cooling Operation Mode Heating Operation Mode Auto Operation Mode Soft Dry Operation Mode Fan Operation Mode HI Po AUTO MED LO Program Holiday SET CLR Min Hour Week Timer Cancel Timer Cancel High 39 C LOW 11 C Fan Operates without cooling heating Cooling Heating Down to 18 C Up to 30 C Down to 16 C Up to 30 C ...

Page 5: ... A E E R kcal h W C O P W W Air Circulation Indoor m3 min Outdoor m3 min Moisture Removal l h Air Flow Direction Control Heating Operation Mode Fan Speeds steps Auto Operation Changeover Forced Operation Jet Cool Soft Dry Operation Timer Delay Safety Function Feature Air Deflection Way Self Diagnosis Hot start Auto Restart Air refresh Hole High Ceiling Group Control Optional wiring Central Control...

Page 6: ...Dimensions 6 269 670 55 570 269 190 5 160 52 90 90 120 4 30 521 670 570 450 40 110 110 670 670 CLOSE OPEN OPEN CLOSE 1 Indoor Unit Model LT E2460FL FA LT E2460RL FL ...

Page 7: ...y valve Liquid side W L6 L7 L8 L9 L4 L11 L10 D L1 L2 L5 L3 MODEL DIM W mm 870 H mm 655 D mm 320 L1 mm 370 L2 mm 25 L3 mm 340 L4 mm 630 L5 mm 25 L6 mm 546 L7 mm 162 L8 mm 162 L9 mm 54 L10 mm 74 5 L11 mm 79 LT E2460FL FA LT E2460RL RA ...

Page 8: ...iquid Side Gas Side COMPRESSOR VALVE REVERSING H EX Gas Side Liquid Side CAPI CAPI Heating Cooling OUTDOOR UNIT Capacity 24K 1 4 1 2 7 5 30 GAS LIQUID 5 15 30 Elevation m Length m Additional refrigerant g m Pipe Size Rated Rated Max Max Rated performance for refrigerant line length of 7 5m If 24K Capacity is installed at a distance of 15m 225g of refrigerant should be added 15 7 5 x30g ...

Page 9: ... FAN MOTOR FUSE 5A FUSE 5A POWER INPUT TO INDOOR UNIT OUTDOOR TH TERMINAL BLOCK Low Ambient PCB 3854A30079E 1 L 2 N 3 L 4 N 5 6 7 8 1 2 3 4 5 6 7 8 9 B L COMP R S H 4 2 8 6 1 0 C BL BL BL WH BL BL BR RD BR BR BR GN YL GN YL CAPACITOR REVERSING VALVE RD BR RD BK OR TB OR YL BK TB WH BK C POWER RELAY FAN MOTOR FUSE 5A FUSE 5A POWER INPUT TO INDOOR UNIT TERMINAL BLOCK 3854A20077U 1 L 2 N 3 L 4 N 5 6 ...

Page 10: ...nd down automatically 3 Air Filter Checking Control Filter sign will appear on the remote controller display and main body display when an air filter is polluted Then clean the air filter referring to Owners Manual 4 Soft Dry Operation The indoor fan speed is automatically set to the low and fan speed control is not available because of already being set to the best speed for Dry Operation by Mico...

Page 11: ...operates at low speed 6 Heating Mode Operation The unit will operate according to the setting by the remote controller and the operation diagram is shown as follows Hot Start Low OFF Selected Fan Speed minimum 3min Selecting fan speed Low Low Low OFF OFF minimum 10sec 1min A A minimum 1min minimum 10sec B 7 Hot Start Control The indoor fan stops until the evaporator piping temperature reaches to 2...

Page 12: ...e in heating mode operation 1st priority Defrost control is carried out according to the indoor pipe temp 60 min later since heating mode opera tion started 2nd priority The temp differences between the indoor pipe temp and the intake air temp 25 min later T1 and 45 min later T2 since heating mode operation started are measured then defrost control is carried out according to the dirrerence T T1 T...

Page 13: ...r the unit to prevent direct sunlight or rain exposure be careful that heat radiation from the condenser is not restricted There should not be any animals or plants which could be affected by hot air discharged Ensure the spaces indicated by arrows from the wall ceiling fence or other obstacles 3 Piping length and the elevation More than 30cm Sunroof Fence or obstacles More than 70cm More than 50c...

Page 14: ...s where inflammable gas is generated flows in is stored or vented 4 Avoid places where sulfurous acid gas or corrosive gas is generated 5 Avoid places near high frequency generators 2 Ceiling opening dimensions and hanging bolt location The dimensions of the paper model for installing are the same as those of the ceiling opening dimensions Select and mark the position for fixing bolts and piping h...

Page 15: ...ler Installation Although the room temperature sensor is in the indoor unit the remote controller should be installed in such places away from direct sunlight and high humidity Installation of the remote controller Select places that are not splashed with water Select control position after receiving customer approval The room temperature sensor is built in the indoor unit This remote controller e...

Page 16: ...mps on the wall by ø 3 tapping screws accessory Fix the remote control cord WIRED REMOTE CONTROL INSTALLATION REMOTE CONTROL PREPARATION OPTIONAL DISASSEMBLING ELECTRICAL WIRING HOW TO MOUNT ONTO A WALL HOW TO INSERT BATTERIES Wire and make sure that teminal numbers are matched on unit side and remote controller side The maximum length of the cord is 100m If the length of the cord exceeds 50m use ...

Page 17: ...or SAA CAUTION 8 5mm 20mm GN YL 7 5mm 20mm GN YL NORMAL CROSS SECTIONAL AREA 0 75mm2 NORMAL CROSS SECTIONAL AREA 2 5mm2 24K Control box cover Indoor power cord Remote controller cord Control box cover fitting screw 2 units Terminal Block of Indoor Unit 3 L 4 N 5 6 7 1 L 2 N 3 L 4 N 5 6 7 8 Terminal Block of Outdoor Unit Power Cord Terminal Block of Indoor Unit 3 L 4 N 5 6 7 1 L 2 N 3 L 4 N 5 6 7 8...

Page 18: ...OCAL REGULATION Main power source Switch box Refrigerant pipe Circuit Breaker Use circuit breaker or time delay fuse ELECTRICAL WIRING CONNECTING THE CABLE TO OUTDOOR UNIT 1 Remove the Cover control from the unit by loosening a screw Connect the wires to the terminals on the control board individually as following 2 Secure the cable onto the control board with the hold er clamper 3 Refix the cover...

Page 19: ...move flare nuts attached to indoor and outdoor units than put them on pipe tube having completed burr removal Not possible to put them on after flaring work 4 Flaring work Carry out flaring work using flaring tool as shown below Firmly hold copper tube in a bar or die as indicated dimension in the table above 5 Check Compare the flared work with figure below If flare is noted to be defective cut o...

Page 20: ... sure to check if there is gas leakage in indoor and outdoor connection After completing the piping connection execute vacuum drying for the connecting piping and the indoor unit The vacuum drying must be carried out using the ser vice ports of both the liquid and gas side valves Use two wrenches and tighten with regular torque Outdoor unit Liquid side Flare connection Flare connection Gas side In...

Page 21: ... two temporarily fixed screws and other two screws Total 4 screws 5 Connect the louver motor connector and display connector 6 After tightening these screws install the air inlet grille including the air filter Decorative panel fixing screws hexagon M5 screws Temporally fitting at 2 places Tightening about 10mm Control box cover Piping side Inlet Grille Inlet Grille Inlet Grille Inlet Grille Inlet...

Page 22: ... to the exterior and leave it provisionally until the test comes to an end Feed water to the flexible drain hose and check the piping for leakage Be sure to check the drain pump for normal operating and noise when electrical wiring is complete When the test is complete connect the flexi ble drain hose to the drain port on the indoor unit Heat insulation material Polyethylene foam with thickness mo...

Page 23: ...ck pip ing and drain piping add further 10mm to 30mm thickness material Indoor unit Thermal insulator accessory Fastening band accessory Refrigerant piping HEAT INSULATION 1 Wrap the connecting portion of indoor unit with the Insulation material and secure it with two Plastic Bands for the right pipings If you want to connect an additional drain hose the end of the drain outlet should keep distanc...

Page 24: ...d 18 minutes later automatically The test run is started by pressing the room temperature checking button and down timer button for 3 sec onds at the same time To cancel the test run press any button After completing work be sure to measure and record trial run properties and store measured data etc Measuring items are room temperature outside temperature suction temperature blow out temperature w...

Page 25: ...aker switch between power source and the unit 3 The screw which fasten the wiring in the casing of electrical fittings are liable to come loose from vibrations 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 give rise to burn out of the wires 4 Specification of power source 5 Confirm that elec...

Page 26: ...main body and of remote controller sensor 3 Move the slide switch to set position 4 Close the rear cover and check if it works normally TH R14H SW TH REMO MAIN 2TH OP7 R18H R17H OP6 LO STAND SW HIGH HI R03S C070 R04S R02S R01S OP3 OP2 OP1 R19H R11H R13H R12H OP5R16H OP4 R15H CO1H REMO Room Temp sensor 2TH MAIN Position 2 Position 1 Position 3 Slide switch for ceiling height Slide switch for 2Therm...

Page 27: ...ration after connecting the brown and yellow wire of each air conditioner Remove the resistor OP 7 in remote controller It operates maximum 16 Units by only one Wired Remote Controller and each Unit starts sequentially to prevent overcurrent Wiring design Features Use Only One Wired Remote Controller with several air conditioners max 16 Units Random starting to prevent overcurrent Operation unit Z...

Page 28: ...harge hose Open the low pressure valve on the charge set slightly to air purge from the charge hose 5 Set the liquid side valve to the closed position 6 Operate the air conditioner in cooling mode 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 indicating 3 to 5kg cm2 g 8 Disconnect the charge set and...

Page 29: ...e nut on liquid side 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 discharge the refrigerant until the gauge indicates 3 to 5 kg cm2 g 6 Disconnect the charge set and the gas cylinder 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 M...

Page 30: ...charge 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 running 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 necessary to apply a evacuatin Discharge the refrigerant gradually if it is discharged too suddenly the refriger...

Page 31: ... 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 2 3 Way valve Outdoor unit Liquid side Indoor unit...

Page 32: ...150g each time while operating the air conditioner in the cooling cycle however one time is not sufficient 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 discharged If the system has been charged with liquid refrigerant while operating the air condition...

Page 33: ...room air humidity When the room air humidity is relativery 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 6 0 kg cm2 G at normal condition 2 The temperature can be measured by attaching the thermometer to the low pressure tub...

Page 34: ... YES NO YES Is the input voltage AC230V Check the FUSE and the wiring diagram Is the PIN 49 58 of MICOM DC5V Exchange MICOM YES NO Check the main P C B pattern NO YES Is the output voltage of IC03D DC5V NO Exchange IC03D Is the input voltage of IC03D about DC12V Check the 5V P C B pattern ...

Page 35: ...s the each Relay any problem YES NO YES It is normal operation Exchange IC01M Exchange Relay YES YES NO YES Is it Heating Mode Does the temperature set all right Change IC01M NO NO Adjust operation mode Adjust set temperature Is IC01M operated normally YES Check the connector CN OUT Check RY 4Way NO Is 4way valve operated Possible Trouble 3 Ineffective Heating ...

Page 36: ...d normally Check the motor and connector CN LOUVER Exchange IC01M NO YES YES YES Is the LCD operated normally Is the terminal of wired Remocon T2 DC12V Is the pin 39 40 of Micom DC 5V Change the wired Remocon Check the wired Remocon PCB and DC 12V pattern NO NO Check the parts of communication Connector CN Remo and terminals of wired Remocon exactly ...

Page 37: ... 37 Electronic control device MAIN P C B ASSY ...

Page 38: ...2D TLP521 C05D 681 5V DISPLAY TFMS 2380B PRE AMP LED2 LED3 LED4 Vout GND Vcc LED1 7 7 4 5 6 4 5 6 1 1 2 3 2 3 5V 29 32 30 31 REMO 26 27 28 24 25 21 22 23 20 19 3 7 8 NF01M 5V ZNR01M NF01M SSR 8 KID65004AF IC01M DC 12V 50 60Hz REMO 13 18 17 16 14 15 11 12 10 9 DC 12V STEP M STEP M STEP M DC 12V KID65004AF IC02M 5 7 6 4 3 103 2 1 1M 1 2W 275V C02J 100nF 3 1 3 1 2 2 M_RTX AC_L 275V C01J 100nF 3 4 NF ...

Page 39: ...Exploded View and Replacement Parts List 1 Indoor Unit Model LT E2460FL FA LT E2460RL RA 39 354211 249951 266090 268714 263230 266012 35211A 263230 2 352118 330870 158591 159830 ...

Page 40: ... 40 346810 130411 359011 159830 135802 135312 2 W0CZZ 135312 1 267110 1 267110 2 130911 1 130911 2 268712 146811 ...

Page 41: ...241D 5211A20241D 5211A20241D 5211A20241D R 354211 EVAPORATOR ASSY BENDING 5421A10006B 5421A10006B 5421A10006B 5421A10006B R 359011 FAN TURBO 5900A10004A 5900A10004A 5900A10004A 5900A10004A R 130911 1 CABINET ASSY INDOOR 3091A10023A 3091A10023A 3091A10023A 3091A10023A R 130911 2 CABINET ASSY INDOOR 3091A10023B 3091A10023B 3091A10023B 3091A10023B R 135312 1 PANEL ASSY FRONT INDOOR 3721A10021C 3721A1...

Page 42: ... 42 2 Outdoor Unit Model LT E2460FL FA LT E2460RL RA 435512 546810 554031 554160 552203 1 649950 669200 552202 561410 W0CZZ 1 552203 2 559010 435311 349480 437212 437210 W0CZZ 2 552115 552111 ...

Page 43: ...TUBE ASSY CONDENSER OUT 5211A30225B 5211A30297B R 552202 VALVE REVERSING 5220AR3228C R 552203 1 VALVE SERVICE 5220A20006A 5220A20006A R 552203 2 VALVE SERVICE 5220A20007A 2H02479F R 554031 CONDENSER ASSY BENT 5403A20022D 5403A20022F R 554160 COMPRESSOR 5416A20018B 5416A20018B R 559010 FAN ASSY PROPELLER 1A00195B 1A00195B R 561410 COIL ASSY REVERSING VALVE 3A02028Y R 649950 CONTROL BOX ASSY OUTDOOR...

Page 44: ...P No 3828A30023K December 2000 Printed in Korea P No 3828A20050H January 2002 Printed in Korea ...

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