LG LM-4462C2T Service Manual Download Page 2

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Contents

Functions ................................................................................................................................ 3

Product Specifications (Cooling & Heating)........................................................................ 5

Dimensions ............................................................................................................................. 6

Refrigeration Cycle Diagram ................................................................................................. 7

Wiring Diagram....................................................................................................................... 9

Operation Details ................................................................................................................. 11

Installation of Indoor, Outdoor Unit.................................................................................... 14

Test Running ........................................................................................................................ 26

Cycle...................................................................................................................................... 31

Cycle Troubleshooting Guide.............................................................................................. 34

Electronic Parts Troubleshooting Guide............................................................................ 35

Electronic Control Device.................................................................................................... 38

Schematic Diagram .............................................................................................................. 40

Exploded View and Replacement Parts List.......................................................................43

–2–

Summary of Contents for LM-4462C2T

Page 1: ...SERVICE MANUAL Ceiling Cassette Multi Air Conditioner MODELS LM 4462H2T LM 4462C2T ...

Page 2: ...n Cycle Diagram 7 Wiring Diagram 9 Operation Details 11 Installation of Indoor Outdoor Unit 14 Test Running 26 Cycle 31 Cycle Troubleshooting Guide 34 Electronic Parts Troubleshooting Guide 35 Electronic Control Device 38 Schematic Diagram 40 Exploded View and Replacement Parts List 43 2 ...

Page 3: ...s 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 wired re...

Page 4: ...mer 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 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: ...uto 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 Wired remote controller with weekly Program Plasma A Cleaner LM 4462H2T LM 4462C2T A or B A or B A B A B 5 22 000 44 000 22 000 44 000 21 500 43 000 2 7 5 4 2 7 ...

Page 6: ...Dimensions Indoor Unit 900 1 225 370 269 670 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 6 Outdoor Unit ...

Page 7: ...525g of refrigerant should be added in Heat pump Model 15 7 5 x 70g 525g When installed at a distance of 15m 375g of refrigerant should be added in Cooling only Model 15 7 5 x 50g 375g Pipe size Diameter ø Piping length m Elevation m Gas Liquid Rated Max Rated Max 5 8 3 8 7 5 50 7 5 30 7 INDOOR A UNIT INDOOR B UNIT OUTDOOR UNIT HEAT EXCHANGER HEAT EXCHANGER HEAT EXCHANGER A COMPRESSOR GAS SIDE LIQ...

Page 8: ... installed at a distance of 15m 525g of refrigerant should be added in Heat pump Model 15 7 5 x 70g 525g When installed at a distance of 15m 375g of refrigerant should be added in Cooling only Model 15 7 5 x 50g 375g Pipe size Diameter ø Piping length m Elevation m Gas Liquid Rated Max Rated Max 5 8 3 8 7 5 30 7 5 15 INDOOR A UNIT INDOOR B UNIT OUTDOOR UNIT HEAT EXCHANGER A COMPRESSOR GAS SIDE LIQ...

Page 9: ...OMP A COMP Capacitor OR YL S C R OR OR OR OR BL Capacitor Capacitor OR BK BK YL BK BK BK WH BL WH BR TB1 TB4 TB5 TB2 TB6 TB3 WH WH BK BK BK BK BK WH BK BK BK YL RD BL GN YL POWER INPUT CN COMP CN FAN CN SV CN COM CN POWER CN TH1 CN TRAMS A INDOOR B INDOOR 6 5 5 6 4 N 4 N 3 L 3 L BK BK REVERSING A COIL MOTOR RELAY B COMP POWER RELAY A COMP POWER RELAY POWER TRANS 1 2 3 4 5 6 7 8 REVERSING B COIL A ...

Page 10: ...B B MOTOR RELAY BK WH YL YL BR BR BR BR RD YL YL YL YL BL BL BK BK OR OR OR OR BK BK OR OR OR 1 2 3 4 5 6 7 8 9 BK BK WH YL BK WH GN YL YL BK BK TEMP THERMISTOR BK BK WH BK BK BK BL BL BL BL BK YL WH RD TB7 3 L POWER INPUT INDOOR EARTH DIAGRAM WIRING A INDOOR TB5 TB8 B INDOOR 4 N 3 L 4 N 5 A 3 L 4 N 5 B TB6 TB4 A COMP S C R S C R TB3 TB2 TB1 B COMP A MOTOR S C R B MOTOR WH OR ...

Page 11: ...and down automatically 3 Air Filter Checking Control Filter will display in the remote controller display and main body display when an air filter is polluted Then clean the air filter for reference to Owners Manual 4 Soft Dry Operation The indoor fan speed is automatically set to the low so the shift of the indoor fan speed is impossible because of already being set to the best speed for Dry Oper...

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: ...fter 45 minutes passed from ending of the first defrost and more than 9 minutes operation of compressor Out door pipe temperature 45MIN over 10min operation of comp 10MIN Outdoor pipe temperature 12 0 C 8 0 C 6 0 C COMP ON FAN OUT 4 WAY ON OFF OFF OFF ON ON ON ON ON OFF 9 Self diagnosis Function CHECK will flash in the remote controller display when a problem occurs Then please contact your dealer...

Page 14: ... spaces indicated by arrows from the wall ceiling or other obstacles The indoor unit must keep the maintenance space 2 Outdoor unit If an awning is built over the unit to prevent direct sunlight or rain exposure be careful that heat radia tion 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 ...

Page 15: ...uction of the air conditioner Make enough distance from a cooking room to install the air conditioner in such a place where it may not suck in oily steam 2 Avoid installing air conditioner in such circumstances where cutting oil mist or iron powder is in sus pension in factories etc 3 Avoid places where inflammable gas is generated flows in is stored or vented 4 Avoid places where sulfurous acid g...

Page 16: ...idering the direction of drain hose Drill the hole for anchor bolt on the wall Level gauge Ceiling Ceiling board Unit mm 570 Unit size 570 Unit size 450 Hanging bolt 75 75 600 Ceiling opening 600 Ceiling opening 521 Hanging bolt 39 5 39 5 This air conditioner uses a drain pump Horizontly install the unit using a level gauge During the installation care must be taken not to damage electric wires CA...

Page 17: ...allation Although the room temperature sensor is in the indoor unit the remote control box should be installed in such places away from direct sunlight and high humidity Installation of the remote control box Select places that are not splashed with water Select control position after receiving customer approval The room temperature sensor of the thermostat for temperature control is built in the ...

Page 18: ...ure 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 Make sure that wire and 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 us...

Page 19: ... Terminal Block of Indoor Unit B Unit 3 L 4 N 5 6 7 3 L 4 N 3 L 4 N 5 A 3 L 4 N 5 B Terminal Block of Outdoor Unit Terminal Block of Outdoor Unit Power Cord LM 4462H2T LM 4462C2T Air inlet side view Control box cover Indoor power cord Remote controller cord Control box cover fitting screw 2 units If the supply cord is damaged it must be replaced by a special cord or assembly available from the man...

Page 20: ...he terminal screws inside the control box may be loose due to vibration during transport Check the screws for loose connection Running the air conditioner with loose connection can overload and damage electrical components 5 Always ground the air conditioner with a grounding wire and connector to meet the LOCAL REGULATION Main power source Switch box Circuit Breaker Use a 50A circuit breaker or ti...

Page 21: ... tubing 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 ...

Page 22: ...pleting the piping connection be 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 service ports of both the liquid and gas side valves Use two wrenches and tighten with regular torque Outdoor unit Liquid side Flare connecti...

Page 23: ...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 24: ...o 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 finished When the test is completed connect the flexi ble drain hose to the drain port on the indoor unit Heat insulation material Polyethylene foam with thickness mor...

Page 25: ... additional drain hose the end of the drain outlet should keep distance from the ground Do not dip it into water and fix it on the wall to avoid swinging in the wind 2 Tape the Pipings drain hose and Connecting Cable from bottom to top 3 Form the pipings gathered by taping along the exterior wall and fix it onto the wall by saddle or equivalent In case of the Outdoor unit being installed below pos...

Page 26: ... 18 minutes later automatically The test run is started by pressing the room temperature checking button and down timer button for 3 seconds 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 win...

Page 27: ...e 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 electrical capacity is sufficient 6 Be sure that the starting voltage is maintained at more than 90 percent of the rated voltage marked on the nam...

Page 28: ...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 29: ...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 30: ...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 31: ...t 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 vacuuming 7 Turn on the vacuum pump until the pressure drops below 0 kg cm2...

Page 32: ... 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 33: ... 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 34: ... on 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...

Page 35: ... 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 36: ...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 37: ...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 38: ... 38 Electronic control device MAIN P C B ASM ...

Page 39: ... 39 2 MAIN P C B ASM OUTDOOR ...

Page 40: ...02D 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 41: ...K R03L 10K 4 7uF C02L 102 A6 A1 COM0 COM2 COM3 COM1 A0 A5 A2 A3 A4 A7 R01K 1K 5V SEG19 COM1 COM0 COM0 A19 COM1 1 3 2 SEG6 SEG1 71 COM0 COM1 COM2 COM3 SEG0 73 74 75 72 SEG2 SEG3 SEG4 SEG5 66 68 69 70 67 SEG7 64 65 SEG8 60 61 63 62 57 59 58 SEG12 P93 SEG11 SEG10 SEG9 SEG15 P90 SEG14 P91 SEG13 P92 50 53 54 56 55 51 52 SEG19 P64 SEG17 P66 SEG18 P65 SEG16 P67 SEG20 P63 SEG21 P62 SEG22 P61 47 49 48 44 4...

Page 42: ... 42 ...

Page 43: ... 43 Exploded View and Replacement Parts List 1 Indoor Unit 354211 249951 249941 268714 266012 35211A 263230 352118 330870 158591 ...

Page 44: ... 44 346810 130411 359011 159830 135802 135312 2 W0CZZ 135312 1 267110 267110 352150 352150 130911 1 130911 2 140570 268712 146811 ...

Page 45: ...R 5231A10005A 249941 CONTROL BOX INDOOR 4994A10014A 249951 CONTROL BOX ASSEMBLY INDOOR 4995A10026W 263230 THERMISTOR ASSEMBLY 6323AQ3214N 263230 THERMISTOR ASSY 6323AQ3226F 266012 SWITCH ASSY FLOAT 6601A20001F 267110 REMOTE CONTROLLER ASSY 6711A10002P 268712 PWB PCB ASSY DISPLAY 6871A20096C 268714 PWB PCB ASSEMBLY MAIN 6871A10040J 330870 DRAIN PAN ASSY 3087A10002A 346810 MOTOR ASSY SINGLE 4681AC20...

Page 46: ...R 5231A10005A 249941 CONTROL BOX INDOOR 4994A10014A 249951 CONTROL BOX ASSEMBLY INDOOR 4995A10026T 263230 THERMISTOR ASSEMBLY 6323AQ3214N 263230 THERMISTOR ASSY 6323AQ3226F 266012 SWITCH ASSY FLOAT 6601A20001F 267110 REMOTE CONTROLLER ASSY 6711A10002A 268712 PWB PCB ASSY DISPLAY 6871A20096A 268714 PWB PCB ASSEMBLY MAIN 6871A10040E 330870 DRAIN PAN ASSY 3087A10002A 346810 MOTOR ASSY SINGLE 4681AC20...

Page 47: ... 47 2 Outdoor Unit 435512 546810 559010 430410 135301 437210 137213 435511 554160 554160 549610 554031 649950 W0CZZ 1 669200 437212 552203 1 552203 2 W0CZZ 2 669200 W6640 2 W6640 1 ...

Page 48: ...0195B 435512 COVER ASSY TOP 3550AP1213B 437210 PANEL ASSY FRONT 3720AP1212B 135301 GRILLE DISCHARGE 3530AP1225B 137213 PANEL SIDE 3720AP1215E 435511 COVER ASSY CONTROL 3A01293X 437212 PANEL ASSY REAR 3720AP1202F 552203 1 VALVE SERVICE 2A00392F 552203 2 VALVE SERVICE 2A00393F 649950 CONTROL BOX ASSY OUTDOOR 4995A20047F W0CZZ 1 CAPACITOR DRAWING 2A00986S W0CZZ 2 CAPACITOR DRAWING 3H00611R 669200 REL...

Page 49: ...20AP1212B 437212 PANEL ASSY REAR 3720AP1202N 546810 MOTOR ASSY OUTDOOR 4681A20013X 549610 MOUNT MOTOR 4960A10004A 552203 1 VALVE SERVICE 2A00392F 552203 2 VALVE SERVICE 2A00393F 554031 CONDENSER ASSY BENT 5403A20044H 554160 COMPRESSOR ASSY FINAL 5417A90002A 559010 FAN ASSY PROPELLER 1A00195B 649950 CONTROL BOX ASSY OUTDOOR 4995A20047M 669200 RELAY 3A00261C 669200 RELAY 6920AP3400A W0CZZ 1 CAPACITO...

Page 50: ...Memo 50 ...

Page 51: ...P No 3828A20197A January 2002 Printed in Korea ...

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