LG LB-G3680AL Service Manual Download

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Ceiling Duct Type Air Conditioner

SVC MANUAL(Exploded View)

MODEL : LB-H1860HL/CL/HP/AL
LB-H1861BL
LB-H2460HL/CL/HP/BL/AL
LB-H2461BL
LB-G3680HL/CL/HP/BL/BS/AL

CAUTION

Before Servicing the unit, read the safety precautions in General SVC manual.
Only for authorized service personnel.

Internal Use Only

http://biz.lgservice.com

Summary of Contents for LB-G3680AL

Page 1: ... MODEL LB H1860HL CL HP AL LB H1861BL LB H2460HL CL HP BL AL LB H2461BL LB G3680HL CL HP BL BS AL CAUTION Before Servicing the unit read the safety precautions in General SVC manual Only for authorized service personnel Internal Use Only http biz lgservice com ...

Page 2: ...Wiring Diagram 12 Operation Details 15 Installation of Indoor Outdoor Unit 18 3 way Valve 35 Cycle 40 Cycle Troubleshooting Guide 43 Electronic Parts Troubleshooting Guide 44 Electronic Control Device 47 Exploded View 48 2 Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 3: ...Heating Capacity Ex 18 18 000Btu h 6 Electric Range 1 9 Electric Standard V Hz Phase 1 115 60 1 2 220 60 1 3 208 230 60 1 5 200 220 50 1 6 220 240 50 1 7 100 50 60 1 8 380 415 50 3 9 380 60 3 B 208 230 60 3 7 Serial No 0 9 8 Heating Cooling Fin Type A Z 9 Option A Z ex Basic Heat Pump H Basic Cooling only C Gold Fin Heat Pump B Gold Fin Cooling only A Basic L Plasma Air Purifier A Drain Pump P Hig...

Page 4: ...s maximum 16 units by only one wired remote con troller and each unit starts random to prevent overcurrent Room temperature sensor Thermistor Maintains the room temperature in accordance with the Setting Temp Indoor fan is delayed for 5 seconds at the starting Restarting is inhibited for approx 3 minutes High Med Low Intermittent operation of fan at low speed Although the air conditioner is turned...

Page 5: ...rature Setting Setting the Timer Weekly Program 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 Phase Control Setting HI MED LO Program Holiday SET CLR Min Hour Week Timer Cancel Timer Cancel Timer High 39 C LOW 11 C Fan Operates without cooling heating Cooling Heating Down to 18 C Up to...

Page 6: ... 50 1 220 240 50 4 536 18 000 4 536 18 000 6 048 24 000 6 048 24 000 5 274 5 274 7 033 7 033 2 000 2 000 2 650 2 850 4 536 18 000 6 048 24 000 5 274 7 033 1 880 2 400 10 10 12 5 13 9 5 11 5 16 5 14 5 13 16 5 14 5 13 18 16 5 14 18 16 5 14 16 5 14 5 13 18 16 5 14 1 300 1 700 1 920 1 920 22 6 22 6 22 6 22 6 3 2 5 3 2 5 3 2 5 3 2 5 6 0 75 4 0 75 6 0 75 4 0 75 L C D Wired L C D Wired L C D Wired L C D ...

Page 7: ...00 9 072 36 000 9 072 36 000 5 274 7 033 10 548 10 548 2 000 2650 4 000 4 000 4 536 18 000 6 048 24 000 9 072 36 000 5 274 7 033 10 548 1 880 2 400 3 300 10 12 5 7 2 7 2 9 5 11 5 6 3 16 5 14 5 13 18 16 5 14 32 29 26 32 29 26 16 5 14 5 13 18 16 5 14 32 29 26 1 300 1 920 1 840 1 800 22 6 22 6 22 6 22 6 3 2 5 3 2 5 4 2 5 4 2 5 6 0 75 6 0 75 5 0 75 4 0 75 L C D Wired L C D Wired L C D Wired L C D Wire...

Page 8: ...ht 2008 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only Dimensions W H D 1 Indoor Unit MODEL DIM W mm 880 880 1180 H mm 260 260 298 D mm 450 450 450 18K 24K 36K ...

Page 9: ...ht 2008 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only 2 Outdoor Unit H W D 18K 24K 36K MODEL DIM W mm 870 870 870 H mm 655 655 800 D mm 320 320 320 18K 24K 36K ...

Page 10: ...rigerant line length of 7 5m If 18K Model is installed at a distance of 15m 255g of refrigerant should be added 15 7 5 x30g 225g INDOOR UNIT OUTDOOR UNIT HEAT EXCHANGER HEAT EXCHANGER COMPRESSOR GAS SIDE LIQUID SIDE COOLING HEATING REVERSING VALVE CAPILLARY TUBE 18K 5 8 1 4 7 5 50 5 30 30 24K 5 8 1 4 7 5 50 5 30 35 36K 5 8 1 4 7 5 50 5 30 45 Additional refrigerant g m Pipe size Diameter ø Piping l...

Page 11: ...K Model is installed at a distance of 15m 225g of refrigerant should be added 15 7 5 x30g 225g INDOOR UNIT OUTDOOR UNIT HEAT EXCHANGER CONDENSER HEAT EXCHANGER CONDENSER COMPRESSOR GAS SIDE LIQUID SIDE CAPILLARY TUBE LB H1860CL 5 8 1 4 7 5 50 5 30 30 LB H2460CL 5 8 1 4 7 5 50 5 30 35 LB G3680CL 5 8 1 4 7 5 50 5 30 45 Additional refrigerant g m Pipe size Diameter ø Piping length m Elevation m MODEL...

Page 12: ...G ONLY Model LB H1860CL LB H2460CL AL OUTDOOR WIRING DIAGRAM INDOOR WIRING DIAGRAM 3854A20166E INDOOR MOTOR DRAIN PUMP BL BK BK YL BK RD BL BR GN YL YL OR BL BL BK GN YL COMP 4 WAY VENT OUT FAN FUSE 250V 3 15A TEMP THERMISTOR PIPE THERMISTOR FLOAT S W REMOTE CONTROL ZONE CONTROL TERMINAL BLOCK TO OUTDOOR UNIT 3 L 4 N 5 6 7 TRIAC A CL UNIT OPTION VENTILATOR T B OUTDOOR WIRING DIAGRAM INDOOR WIRING ...

Page 13: ...cs Inc All right reserved Only for training and service purposes LGE Internal Use Only HEAT PUMP Model LB G3680HL COOLING ONLY Model LB G3680CL OUTDOOR WIRING DIAGRAM INDOOR WIRING DIAGRAM OUTDOOR WIRING DIAGRAM INDOOR WIRING DIAGRAM ...

Page 14: ... All right reserved Only for training and service purposes LGE Internal Use Only HEAT PUMP Model LB G3680BS COOLING ONLY Model LB G3680CL AL ANW8DXT OUTDOOR WIRING DIAGRAM INDOOR WIRING DIAGRAM OUTDOOR WIRING DIAGRAM INDOOR WIRING DIAGRAM ...

Page 15: ...hile compress is off While compressor is running it takes 3 5 seconds to switch 2 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 Operation by Micom Control 3 Cooling Mode Operation When selecting the Cooling Mode Operation the unit will operate according to the setting...

Page 16: ...emperature is higher than 42 C fan operates at seleted fan speed when it becomes lower than 39 C the fan operates at low speed 4 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 Selecting Fan Speed minimum 3min Selecting fan speed minimum 10sec 1min A A minimum 10sec B 5...

Page 17: ...e 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 T2 3rd priority Defrost control is carried out according to the temp dirrerence E TE1 TE2 between the indoor pipe temperatures of 25 min later TE1 and 45 min later TE2 after heating mode operation started When the ...

Page 18: ... 2 Outdoor unit If an awning is built over 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 Indoor unit Outdoor unit B A ...

Page 19: ...cations 1 In such places as restaurants and kitchens considerable amount of oil steam and flour adhere to the fan the fin of the heat exchanger resulting in heat exchange reduction spraying dispersing of water drops etc In these cases take the following actions Make sure that the ventilation fan for smoke collecting hood on a cooking table has sufficient capacity so that it draws oily steam which ...

Page 20: ...s 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 equipped with liquid crystal display If this position is higher or lower display is difficult to see The standard height is 1 2 1 5m high Routing of the remote controller cord Keep the remote controller cord away from the refrig...

Page 21: ... the under plate from Remote control box Fix the cord clamps 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 th...

Page 22: ... the terminal are free from looseness WARNING POWER INPUT Cooling Heating type Cooling only type 380 415V3N 220 240V Terminals on the indoor unit 1 2 4 5 3 Terminals on the outdoor unit 1 2 4 5 3 POWER INPUT POWER INPUT Cooling only type Terminals on the indoor unit 1 L 2 N 4 N 5 3 L Terminals on the outdoor unit 4 N 5 6 3 L 1 L 2 N 4 N 5 6 7 8 3 L 4 N 5 6 7 3 L Terminals on the indoor unit 1 2 4 ...

Page 23: ... local requirements Select a power source that is capable of supply ing the current required by the air conditioner Use a recognized circuit breaker between the power source and the unit A disconnection device to adequately disconnect all supply lines must be fitted Capacity of circuit breaker INDOOR UNIT Remove the control box cover for elec trical connection between the indoor and outdoor unit R...

Page 24: ...move 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 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 C...

Page 25: ...or unit 4 After completing 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 ser vice ports of both the liquid and gas side valves Use two wrenches and tighten with regular torque Outdoor unit Liquid...

Page 26: ...00mm HP CP model only Front of view Always lay the drain with downward inclination 1 50 to 1 100 Prevent any upward flow or reverse flow in any part 5mm or thicker formed thermal insulator shall always be provided for the drain pipe 1 Install declination of the indoor unit is very important for the drain of the duct type air conditioner 2 Minimum thickness of the insulation for the connecting pipe...

Page 27: ...Insulate and tape both the gas piping and liquid piping THERMAL INSULATION 5 7mm Indoor Outdoor WALL Make sure that there is no clearance here Overlap with thermal insulator for piping Thermal insulator for refrigerant pipe Local supply Thermal insulator for piping Local supply Hose clip for thermal insulator Local supply Union for liquid pipe Refrigerant pipe and thermal insulator Local supply Un...

Page 28: ...ically 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 wind velocity wind volume v...

Page 29: ...ntained at more than 90 percent of the rated voltage marked on the name plate 7 Confirm that the cable thickness is as specified in the power sources specification Particularly note the relation between cable length and thickness 8 Never fail to equip a leakage breaker where it is wet or moist 9 The following troubles would be caused by voltage drop down Vibration of a magnetic switch damage on th...

Page 30: ...emperature is controlled by lower temperature between the temperature of 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 Posi...

Page 31: ... 4 Humidify JET AUTO AUTO SWING OPERATION FAN SPEED Program 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 Controlle...

Page 32: ...ed is varied according to the state of dampers by micom 2 Position F H Maximum E S P setting Fan speed doesn t vary according to the opening Closing of dampers 3 Position V L Minimum E S P setting Fan speed is varied according to the state of dampers by micom Maximum 18 24K 8mmAq 36K 10mmAq Minimum All 0mmAq 3 Move the slide switch to set position 4 Close the rear cover and check if it works norma...

Page 33: ...NE Operation unit Program set Room Temp MED LO AUTO JET Heater Defrost Filter Humidify Out door Timer On Set no Time Off 01 03 05 07 09 11 13 15 17 19 21 23 1 3 4 FAN SPEED HI 2 Timer 1 2 3 5 4 Timer Procedure of RPM change Ex External Static pressure is 6mmAq for Model Name LB G3680HL To protect the unit compressor is designed to be off during E S P setting Push the On Off button The unit will st...

Page 34: ...L CL 16 5 CMM 14 5 CMM 13 CMM 18 CMM 16 5 CMM 14 CMM 32 CMM 29 CMM 26 5 CMM 235 245 254 220 235 250 230 240 245 230 238 252 205 230 240 230 238 245 225 235 248 190 220 235 225 237 243 215 230 245 50 200 230 220 235 243 180 215 240 1 100 210 150 230 240 1 220 240 Table 1 Note 1 Be sure to set the value refering table 1 Unexpected set value will cause mal function 2 Table 1 is based at 230V Accordin...

Page 35: ...peration and wait for 3 minutes then connect the charge set to the service port of the 3 way valve Connect the charge hose to the service port 4 Air purging of the charge 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 posi tion 6 Operate the air conditioner in cooling mode and stop it when the gauge indicates ...

Page 36: ... After purging the air use a torque wrench to tighten the flare 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 dis charge the refrigerant until the gauge indicates 3 to 5 kg cm2 g 6 Disconnect the charge set and the gas cylin der and set the 2 way and 3 way valves to the open position ...

Page 37: ...vice port 3 Open the valve Lo side on the charge set and discharge 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 run ning 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 neces sary to apply a evacuatin Discharge the refri...

Page 38: ...rm that the gauge needle has moved toward 76 cmHg vacuum of 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 V...

Page 39: ... charge the system with liquid refrigerant If the system can not be charged with the spec ified amount of refrigerant it can be charged with a little at a time approximately 150g each time while operating the air conditioner 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 fr...

Page 40: ...for leakage On checking the service valve of main service port must be closed this test is only for checking whether pipe connection is ok or not 5 If there is no leakage discharge R22 in piping com pletely into tank for retrieving Complete discharge is needed for vacuuming If leakage is found please fasten the joint more tight ly 6 After closing the valve of charging hose discon nect the tank and...

Page 41: ...such as retrieving tank opening the valve of charg ing hose gas side slightly 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 0kgf cm2 5 After the needle of gage indicates below 0 kgf cm2 close the valve of gas side quickly and tu...

Page 42: ... of refrigerant it can be charged with a little at a time approximately 150g each time while operating the air conditioner in the cooling cycle however one time is not suffi cient 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 dis charged If the system has been charged ...

Page 43: ...ture difference between intake and discharge air depends on room air humidity When the room air humidity is relativery higher temperature difference is smaller When the room air humidity is relatively lower tem perature 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 ...

Page 44: ...uide The unit does not operate Possible Trouble 1 YES NO 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 AC12V Check the 5V P C B pattern ...

Page 45: ...normally Check the fan motor and connector CN MOTOR YES Is 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 ...

Page 46: ...ble 4 Wired remote controller does not operate 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 48: ...LGE Internal Use Only Exploded View and Replacement Parts List 1 Indoor Unit Models LB H1860HL CL HP LB H2460HL CL HP BL LB G3680HL CL HP BL BS LB H1861BL LB H2461BL LB H1860AL LB H2460AL 346810 359012 354210 552111 152302 352118 330870 W0CZZA 268711B 249951 336610B 267110 263230A 263230A 336610A ...

Page 49: ...s Inc All right reserved Only for training and service purposes LGE Internal Use Only 346810 359012 354210 552111 152302 352118 330870 437213A 437213B W0CZZA 268711B 249951 137213B 137214 137213A 336610B 267110 567480B 567480A 336610A ...

Page 50: ...nics Inc All right reserved Only for training and service purposes LGE Internal Use Only 346810 359012 354210 552111 352118 330870 437213A 437213B W0CZZA 268711B 249951 137213B 137214 137213A 336610B 267110 567480B 567480A 336610A ...

Page 51: ...s Inc All right reserved Only for training and service purposes LGE Internal Use Only 346810 359012 354210 552111 152302 352118 330870 437213A 437213B W0CZZA 268711B 249951 137213B 137214 137213A 336610B 267110 567480B 567480A 336610A ...

Page 52: ...s Inc All right reserved Only for training and service purposes LGE Internal Use Only 346810 359012 354210 552111 152302 352118 330870 437213A 437213B W0CZZA 268711B 249951 137213B 137214 137213A 336610B 267110 567480B 567480A 336610A ...

Page 53: ... purposes LGE Internal Use Only 2 Outdoor Unit Models LB H1860HL CL LB H2460HL CL LB H1861BL LB H2461BL LB H1860AL LB H2460AL 437212 435512 435511 554031 559010 437211 435301 349480 430411 546810 552114 552203A 552203B 552115 554160 649950 W0CZZB W6920 349600 447910 552202 552116 561410 ...

Page 54: ...nc All right reserved Only for training and service purposes LGE Internal Use Only 437212 435512 435511 554031 559010 437211 435301 349480 430411 546810 552114 552203A 552203B 552115 554160 649950 W6920 349600 447910 552202 552116 561410 ...

Page 55: ...ll right reserved Only for training and service purposes LGE Internal Use Only 437212 435512 435511 554031 559010 437211 435301 349480 430411 546810 552114 552203A 552203B 552115 554160 649950 W0CZZB W6920 349600 447910 552202 552116 561410 ...

Page 56: ...ng and service purposes LGE Internal Use Only 3 Outdoor Unit Models LB G3680HL CL 435300 137213C 435512 435301 437210 349480 430411 435511 268711 554031 546810 349600 559010 552112 W0CZZB 137213D W6920 566000 649950 554160 447910 552203A 552203B 552111A 552202 552116 561410 ...

Page 57: ...l right reserved Only for training and service purposes LGE Internal Use Only 566000 435300 137213C 435512 435301 437210 349480 430411 435511 554031 546810 349600 559010 552112 W0CZZB 137213D W6920 649950 554160 447910 552203A 552203B 552111A ...

Page 58: ... All right reserved Only for training and service purposes LGE Internal Use Only 435300 137213C 435512 435301 437210 349480 430411 435511 554031 546810 349600 559010 552112 W0CZZB 137213D W6920 649950 554160 447910 552203A 552203B 552111A ...

Page 59: ... All right reserved Only for training and service purposes LGE Internal Use Only 435300 137213C 435512 435301 437210 349480 430411 435511 554031 546810 349600 559010 552112 W0CZZB 137213D W6920 649950 554160 447910 552203A 552203B 552111A ...

Page 60: ...P NO 3828A20172A JANUARY 2008 ...

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