LG LT-E1820CL Service Manual Download Page 2

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Contents

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

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

Dimensions ..............................................................................................................................7

Refrigeration Cycle Diagram ..................................................................................................9

Wiring Diagram ......................................................................................................................11

Operation Details ...................................................................................................................12

Installation of Indoor, Outdoor Unit .....................................................................................13

3-way Valve ............................................................................................................................31

Cycle Troubleshooting Guide ...............................................................................................36

Electronic Parts Troubleshooting Guide .............................................................................37

Electronic Control Device .....................................................................................................40

Schematic Diagram ...............................................................................................................41

Exploded View and Replacement Parts List .......................................................................42

–2–

Summary of Contents for LT-E1820CL

Page 1: ...Ceiling Cassette Air Conditioner SERVICE MANUAL MODELS LT E1820CL LT E1820HL LT E1860CL LT E1860HL LT E1862HL LT E2460CL LT E2460HL LT E2462HL Библиотека СОК ...

Page 2: ...ration Cycle Diagram 9 Wiring Diagram 11 Operation Details 12 Installation of Indoor Outdoor Unit 13 3 way Valve 31 Cycle Troubleshooting Guide 36 Electronic Parts Troubleshooting Guide 37 Electronic Control Device 40 Schematic Diagram 41 Exploded View and Replacement Parts List 42 2 ...

Page 3: ...of up to 700mm is possible 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 ...

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: ...36 5 274 18 000 1 900 1 900 8 8 8 8 53 53 2 39 2 78 13 50 1 9 O O 4 O O O O O 4 O O O O O O Optional O X 1 910 570 x 570 x 269 670 x 670 x 30 870 x 655 x 320 19 61 14 3 2 5 18 6 0 75 1 4 6 35mm 5 8 15 88mm 50 30 FoamPE 5mm ø25 32 LT E1860CL LT E1860HL LT E1862HL LT E1820CL LT E1820HL Power Supply ø V Hz Capacity Cooling kcal h W Btu h Heating kcal h W Btu h Input Cooling W Heating W Running Curren...

Page 6: ...ion Cable AWG P mm2 Service Valve Liquid inch Gas inch Installation Pipe Length m Elevation m Insulation material thickness Drain Hose I D O D mm 1 220 240 50 5 871 6 827 23 300 2 600 13 5 62 2 26 15 5 50 2 9 O X 4 O O O O O 4 O X O O O O Optional O X 1 900 570 x 570 x 269 670 x 670 x 30 870 x 655 x 320 19 16 5 2 5 61 14 3 2 5 18 4 0 75 1 4 6 35mm 5 8 15 88mm 50 30 FoamPE 5mm ø25 32 1 220 240 50 5...

Page 7: ...Dimensions 7 269 670 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 ...

Page 8: ... way valve Liquid side 3 way valve 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 All Models ...

Page 9: ...ant should be added 15 7 5 x25g 9 INDOOR UNIT H EX Liquid Side Liquid Side Gas Side COMPRESSOR VALVE REVERSING ACCUM H EX Gas Side Gas Side Liquid Side CAPI C1 CAPI A CAPI B Heating Cooring CAPI C2 OUTDOOR UNIT Capacity 18K 1 4 3 8 7 5 50 24K 1 4 3 8 7 5 50 GAS LIQUID 5 30 25 5 30 30 Elevation m Length m Additional refrigerant g m Pipe Size Rated Rated Max Max ...

Page 10: ...frigerant should be added 15 7 5 x25g INDOOR UNIT H EX Liquid Side Liquid Side Liquid Side COMPRESSOR ACCUM H EX Gas Side Gas Side Gas Side CAPI C1 CAPI A CAPI B CAPI C2 OUTDOOR UNIT Capacity 18K 1 4 3 8 7 5 50 24K 1 4 3 8 7 5 50 GAS LIQUID 5 30 25 5 30 30 Elevation m Length m Additional refrigerant g m Pipe Size Rated Rated Max Max ...

Page 11: ...DOOR MOTOR DRAIN PUMP STEP MOTOR TEMP THERMISTOR PIPE THERMISTOR REMOTE CONTROL FLOAT S W CN DISP DISPLAY PCB TERMINAL BLOCK TO OUTDOOR UNIT BR YL BK OR BL BL BR GN YL RD BL GN YL COMP 3 L 4 N 5 6 7 FUSE T3 15A COMP R S H 4 2 8 6 1 0 C F BL YL OR BK TB2 BR BR BR BR BL BL BL BL BL GN YL GN YL BK RD CAPACITOR RD C POWER RELAY FAN MOTOR FUSE 5A FUSE 5A POWER INPUT TO INDOOR UNIT TERMINAL BLOCK 1 L 2 ...

Page 12: ...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 13: ... when it becomes lower than 33 C the fan operates at low speed 6 Heating Mode Operation Except Cooling Model The unit will operate according to the setting by the remote controller and the operation diagram is shown as following Hot Start Low OFF Selecting Fan Speed minimum 3min Selecting fan speed minimum 10sec 1min A A minimum 1min minimum 10sec B 7 Hot Start Control The indoor fan stops until t...

Page 14: ...MPRESSOR 4 WAY VALVE INDOOR FAN 6 C ON 12 C OFF The outdoor piping Temp ON More than 10 min running of compressor More than 45 minutes of heating operation 5sec HOT START ON 9 Self Diagnosis Function CHECK will flash in the remote controller display when a problem occurs Then please contact your dealer Correct the accident point as shown in the table below before restarting operation During the no...

Page 15: ...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 50cm More than More than 30cm More than 30cm Indoor unit Outdoor unit B A ...

Page 16: ...ces 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 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 Ceiling board Level gauge Ceiling U...

Page 17: ...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 18: ...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 19: ...inal 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 Terminal Block of Outdoor Unit Power Cord Control box cover Indoor power cord Remote controller cord Control box cover fitting screw 2 units 5 Wiring Connection Open the control box cover and connect the Remote controller cord...

Page 20: ...CAL 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 21: ...a little longer than measured distance Cut the cable 1 5m longer than the pipe length 2 Burrs removal Completely remove all burrs from the cut cross section of pipe tube Put the end of the copper tube pipe to downward direc tion as you remove burrs in order to avoid to let burrs drop in the tubing 3 Putting nut on Remove flare nuts attached to indoor and outdoor units than put them on pipe tube ha...

Page 22: ...ure 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 Indo...

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: ... 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 25: ...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 26: ...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 27: ...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 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: ...TAND Slide switch for ceiling height Slide switch for 2Thermistor Standard Default Low ceiling High Ceiling Ceiling height Mode of slide switch Change of air volume Remark more than 3 3m High Ceiling Increasing 2 7 3 3m Standard less than 2 7m Low Ceiling Decreasing Maunfactured in stan dard mode NOTICE NOTICE OUTDOOR WIRING DIAGRAM INDOOR WIRING DIAGRAM COMP R S H 4 2 8 6 1 0 C F BL YL OR BK TB2 ...

Page 30: ...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 12V YL SIGNAL YL SIGNAL YL SIGNAL BR GND BR GND BR GND Connecting Cable Local Supply Connector Connector Be careful not to exchange the color of wires The maximum length of connecting wire ...

Page 31: ... 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 moun...

Page 32: ...lare 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 ...

Page 33: ...scharge 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 refrige...

Page 34: ...4 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 Way valve Outdoor unit Liquid side Indoor unit ...

Page 35: ... 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 conditio...

Page 36: ...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 37: ...YES Is the input voltage of transformer 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 38: ...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 39: ...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 40: ... 40 Electronic control device MAIN P C B ASM ...

Page 41: ...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 42: ...Exploded View and Replacement Parts List 1 Indoor Unit 42 354212 249951 266090 268714 266012 35211A 263230 352118 330870 158591 159830 ...

Page 43: ... 43 346810 130411 359011 159830 135802 135312 2 W0CZZ 135312 1 267110 267110 352150 352150 130911 140570 268712 146811 ...

Page 44: ...4681AC2026C 4681AC2026D 4681AC2026C 359011 FAN TURBO 5900A10004A 140570 LOCKER 4056A20001A 130911 CABINET ASSY INDOOR 3091A10023A B 352150 DRAIN ASSY TUBE 5251A20002A 135312 1 PANEL ASSY FRONT INDOOR 3721A10021C 3721A10021A 3721A10021B 3721A10021C 3721A10021A 3721A10021B 3721A10021C 3721A10021A 146811 MOTOR ASSY STEP 4681AP2968D 268712 PWB PCB ASSY DISPLAY 6871A20096A 159830 FILTER ASSY 5231A10005...

Page 45: ... 45 2 Outdoor Unit 435512 546810 549610 554031 554160 552203 1 649950 435511 669200 552202 561410 W0CZZ 552203 2 447910 550140 559010 430410 135301 349480 437212 437210 ...

Page 46: ...R 550140 ISOLATOR COMP 5040A30017B 4H01765A 4H00982E R 552202 VALVE REVERSING 3A02027A 3A02027A R 552203 1 VALVE SERVIDE P15 88 2A00392E R 552203 2 VALVE SERVICE P6 35 2H02479B R 554031 CONDENSER ASSY BENT 5402AR2347K 5402AR2347B 5402AR2347B 5402AR2347K 5402AR2347B 5402AR2347B 5402AR2347H 5402AR2347B 554160 COMPRESSOR ASSY FINAL 5416A20016A 2A00713D 5416A20003D R 559010 FAN ASSY PROPELLER 1A00195B...

Page 47: ...P No 3828A30023K December 2000 Printed in Korea P No 3828A20048D February 2001 Printed in Korea ...

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LG LT-E1820CL, Service Manual

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