LG LT-D5480CA Service Manual Download

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Ceiling Cassette
Air Conditioner

SERVICE MANUAL

MODELS: LT-D5480HL

LT-D5480HA
LT-D5480CL
LT-D5480CA

Summary of Contents for LT-D5480CA

Page 1: ...Ceiling Cassette Air Conditioner SERVICE MANUAL MODELS LT D5480HL LT D5480HA LT D5480CL LT D5480CA ...

Page 2: ...igeration Cycle Diagram 8 Wiring Diagram 10 Operation Details 11 Installation of Indoor Outdoor Unit 14 Cycle 30 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: ...0mm is possible High Ceiling corresponding Function According to the height of ceiling the RPM of indoor fan motor is selected 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 be connected It operates maximum 16 units by only one wir...

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 JET 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: ... 5mm FoamPE 5mm FoamPE 5mm FoamPE 5mm Ø25 32 Ø25 32 Ø25 32 Ø25 32 LT D5480HA LT D5480HL LT D5480CA LT D5480CL Power Supply ø V Hz Capacity Cooling kcal h W Btu h Heating kcal h W Btu h Input Cooling W Heating W Running Current Cooling A Heating A Starting Current Cooling A Heating A E E R kcal h W C O P W W Air Circulation Indoor m3 min Outdoor m3 min Moisture Removal h Air Flow Direction Control ...

Page 6: ...Dimensions 6 290 950 950 950 950 290 210 5 180 52 140 40 110 30 90 90 110 55 840 785 840 678 1 Indoor Unit ...

Page 7: ... L4 H L11 L10 L5 W D L1 L2 L3 Gas side 3 way valve Liquid side 3 way valve MODEL DIM W mm 900 H mm 1 225 D mm 370 L1 mm 460 L2 mm 45 L3 mm 410 L4 mm 1 135 L5 mm 90 L6 mm 550 L7 mm 175 L8 mm 175 L9 mm 112 L10 mm 120 L11 mm 83 54K Models ...

Page 8: ...d at a distance of 15m 450g of refrigerant should be added 15 7 5 x 60g 8 INDOOR UNIT OUTDOOR UNIT HEAT EXCHANGER HEAT EXCHANGER COMPRESSOR GAS SIDE LIQUID SIDE COOLING HEATING REVERSING VALVE CAPILLARY TUBE Capacity 54K 3 4 1 2 7 5 50 GAS LIQUID 5 30 60 Elevation m Length m Additional refrigerant g m Pipe Size Diameter ø Rated Rated Max Max ...

Page 9: ...ed at a distance of 15m 450g of refrigerant should be added 15 7 5 x 60g INDOOR UNIT OUTDOOR UNIT HEAT EXCHANGER CONDENSER HEAT EXCHANGER CONDENSER COMPRESSOR GAS SIDE LIQUID SIDE CAPILLARY TUBE Capacity 54K 3 4 1 2 7 5 50 GAS LIQUID 5 30 60 Elevation m Length m Additional refrigerant g m Pipe Size Rated Rated Max Max ...

Page 10: ...1 2 3 4 5 6 31 T B1 T B2 32 B A FMo 49FMo FMo 49FMo YL BK OR BK T3 T2 T1 RD WH CM 1 2 3 4 5 6 7 8 YL BK OR BK BK BL BL BK WH Co Co 20SV GN YL TMo To the indoor unit 1 L 2 N 3 4 5 BK WH WH YL BK RD F1 F1 OUTDOOR WIRING DIAGRAM INDOOR WIRING DIAGRAM INDOOR MOTOR DRAIN PUMP STEP MOTOR TEMP THERMISTOR PIPE THERMISTOR REMOTE CONTROL FLOAT S W CN DISP DISPLAY PCB ONLY LT D xxx2CL AIR CLEANER H V ASSY DO...

Page 11: ...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 12: ...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 13: ...K will flash in the remote controller display when a problem occurs Correct the FAULT MESSAGES as shown in the table below before restarting operation During the normal operation CHECK won t be displayed in the remote controller Remote controller LCD FAULT MESSAGES CH 01 Indoor room temperature thermistor error CH 02 Indoor piping thermistor error CH 03 Indoor main body Remote controller unit comm...

Page 14: ...sure 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 Indoor unit Outdoor unit B A More than 30cm Fence or obstacles More than 70cm More than 50cm More than More than 30cm Mo...

Page 15: ...void places near high frequency generators 2 Ceiling opening dimensions and hanging bolt location Ceiling board Level gauge Ceiling Use the ventilation fan for smoke collecting hood with sufficient capacity Cooking table Air conditioner Take enough distance Unit mm 840 Unit size 840 Unit size 672 Hanging bolt 101 5 101 5 875 Ceiling opening 875 Ceiling opening 785 Hanging bolt 45 45 The dimensions...

Page 16: ...ller 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 ...

Page 17: ... that both batteries are new Re attach the cover Slide it back into position WIRED REMOTE CONTROL INSTALLATION REMOTE CONTROL PREPARATION OPTIONAL DISASSEMBLING ELECTRICAL WIRING HOW TO MOUNT ON 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 a...

Page 18: ...al cord or assembly available from the manufacturer or its service agent NORMAL CROSS SECTIONAL AREA 0 75mm2 36K 1 25mm2 48K 54K NORMAL CROSS SECTIONAL AREA 2 5mm2 36K 3 5mm2 48K 54K Terminal Block of Outdoor Unit 1 L 2 N 3 4 5 1 L 2 N 3 4 5 Terminal Block of Outdoor Unit 1 L 2 N 3 4 5 Terminal Block of Indoor Unit Terminal Block of Indoor Unit Control box cover Indoor power cord Remote controller...

Page 19: ...et the LOCAL 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 holder clamper 3 Refix th...

Page 20: ... 3 Putting nut on Remove 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 t...

Page 21: ... 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 Indoor unit Union P...

Page 22: ...en completely 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 Louve...

Page 23: ... 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 24: ...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 25: ...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 data are room temperature outside temperature suction temperature blow out temperature air ...

Page 26: ...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 27: ...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 28: ...red remote controller 3 Move the slide switch to the set position 4 Close the rear cover and check if it works nomally 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 Lo Hi STAND Slide switch for ceiling height Slide switch for 2Thermistor Standard Default Low ceiling High Ceiling Ceiling height Mode o...

Page 29: ...am set SUB FUNCTION SET TEMP Room Temp HI MED LO Heater Defrost Filter Preheat Out door Time Timer On Set no Time Off 01 03 05 07 09 11 13 15 17 19 21 23 Indoor Unit 1 Terminal Local Supply Block Terminal Local Supply Block Terminal Local Supply Block Main PCB 1 Main PCB 2 Main PCB 16 Wired Remote Controller Slide Switch OP7 Remote Controller PCB Indoor Unit 2 Main PCB Indoor Unit 16 Connector RED...

Page 30: ...ed this test is only for checking whether pipe connection is OK or not 5 If there is no leakage discharge N2 in piping completely into tank for retrieving Completely discharge is needed for vacuuming If leakage is found please fasten the joint more tightly 6 After closing the valve of charging hose disconnect the tank and connect the vacuum pump to charging hose and open the valve again for vacuum...

Page 31: ... and then close it tightly 3 Operate the air conditioner for 10 15 min until cycle is stabilized 4 Close the spindle of service port liquid side high pressure and wait till pressure of gas side low pressure drops below 0 kgf cm2 5 After the needle of gage indicates below 0 kgf cm2 close the valve of gas side quickly and turn off the power 6 Disconnect the piping between indoor and outdoor unit and...

Page 32: ... approximately 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 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 conditioner...

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 ASM ...

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 39 266090 130411 354211 158591 330870 263230 352118 266012 552111 159830 249951 268714 ...

Page 40: ... 40 130411 346810 152312 135313 135802 352150 1 359012 130911 1 130911 2 352150 2 140570 W0CZZ 146811 135312 1 267110 1 267110 2 268712 ...

Page 41: ... 4056A20001B R 130911 1 CABINET ASSY INDOOR 3091A10031A 3091A10031A 3091A10031A 3091A10031A R 130911 2 CABINET ASSY INDOOR 3091A10030A B 3091A10030A B 3091A10030A B 3091A10030A B R 352150 2 DRAIN ASSY TUBE 5251A20002B 5251A20002B 5251A20002B 5251A20002B R 135312 1 PANEL ASSY FRONT INDOOR 3721A10025C 3721A10025A 3721A20025R 3721A20025B R 135313 GRILLE INLET 3530A10062A 3530A10062A 3530A10062A 3530A...

Page 42: ... D5480HA LT D5480HL LT D5480CA LT D5480CL 42 435512 546810 349600 649950 430411 437212 268711 552203 1 548490 552203 2 435312 559010 137212 566000 552202 W6920 554031 554031 566001 W0CZZ 1 W0CZZ 2 561410 435511 437210 554160 ...

Page 43: ...01890G 2H01890G 2H01890G R 552203 2 VALVE SERVICE 2A00499A 2A00499A 2A00499A 2A00499A R 554031 CONDENSER ASSY BENDING 5403AP2378D F 5403AP2378D F 5403A20003M P 5403A20003M P R 554160 COMPRESSOR 5417A20008G 5417A20008G 5417A20008G 5417A20008G R 559010 FAN ASSY PROPELLER 1A00195B 1A00195B 1A00195B 1A00195B R 561410 COIL ASSY REVERSING VALVE 3A02028B 3A02028B R 649950 CONTROL BOX ASSY OUTDOOR 6615AP2...

Page 44: ...P No 3828A30023K December 2000 Printed in Korea P No 3828A20048R December 2001 Printed in Korea ...

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