LG LB-E4880HL Service Manual Download Page 3

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Functions

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.

The setting temperature, indoor fan speed and desired operation mode are automatically set.

Both the indoor and outdoor fan stops during defrosting.
Hot start after defrost ends.

The indoor fan stops until the evaporator piping temperature will be reached at 28°C.

Indoor Unit

Operation ON/OFF by Remote controller

Sensing the Room Temperature

Room temperature control

Starting Current Control

Time Delay Safety Control

Indoor Fan Speed Control

Soft Dry Operation Mode

Deice (defrost) control (Heating)

Hot-start Control (Heating)

Auto Operation

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LGE Internal Use Only

Summary of Contents for LB-E4880HL

Page 1: ... Conditioner SVC MANUAL Exploded View MODEL LB E4880HL 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: ...etails 9 Installation of Indoor Outdoor Unit 12 Test Running 23 3 way Valve 25 Cycle Troubleshooting Guide 30 Electronic Parts Troubleshooting Guide 31 Electronic Control Device 34 Schematic Diagram 35 Exploded View 36 2 Copyright 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 3: ...th the indoor and outdoor fan stops during defrosting Hot start after defrost ends The indoor fan stops until the evaporator piping temperature will be reached at 28 C Indoor Unit Operation ON OFF by Remote controller Sensing the Room Temperature Room temperature control Starting Current Control Time Delay Safety Control Indoor Fan Speed Control Soft Dry Operation Mode Deice defrost control Heatin...

Page 4: ...perature Setting Setting the Time or Timer Cooling model only Heating model only Low Med High Cooling Operation Mode Heating Operation Mode Soft Dry Operation Mode Fan Operation Mode HI MED LO Set 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 When the air conditioner is turned off by a power failure it is restarted automatic...

Page 5: ...Heating E E R Btu h W Indoor Outdoor Indoor Outdoor Refrigerant R 22 g Remocon Type Liquid Gas Drain Hose Connecting Wire Main Power Cable Time Delay Safety Function Soft Dry Fan Speed Indoor Timer Self Diagnosis Air Circulation m3 min Dimensions W H D Net Weight mm kg W A LB E4880HL 380 415V Service Valve Connecting Tube 48 000 12 090 48 000 12 090 3ø 380 415V 50Hz 50 105 6 000 5 500 10 10 8 0 1 ...

Page 6: ... 6 Copyright 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only Dimensions MODEL LB E4880HL Indoor Unit 900 1220 370 1230 680 370 Outdoor Unit ...

Page 7: ... distance 70g of refrigerant should be added for each meter ex When installed at a distance of 15m 525g of refrigerant should be added 15 7 5 x 70g 525g Pipe size Diameter ø Piping length m Elevation m MODEL Gas Liquid Rated Max Rated Max LB E4880HL 3 4 1 2 5 30 5 30 70 INDOOR UNIT OUTDOOR UNIT HEAT EXCHANGER HEAT EXCHANGER COMPRESSOR GAS SIDE LIQUID SIDE COOLING HEATING REVERSING VALVE CHECK VALV...

Page 8: ...CM 1 2 3 4 5 6 7 8 YL BK OR BK BK BK CH BK WH BL BL WH Co Co 20SV WH F1 BK BK BK CH NOTE BL BLUE BK BLACK OR ORANGE GN YL GREEN YELLOW RD RED WH WHITE YL YELLOW Outdoor Unit Wiring Diagram R TM 3Ø 380 415V 50Hz POWER SUPPLY S T N BK BK BK WH WH WH WH RD OR BK 63H2 WH D P C TH TNS NO NC WH OR BK 52F1 52C 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...

Page 9: ...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 10: ... operates at seleted fan speed when it becomes lower than 35 C the fan operates at low speed for 10sec after 10sec it operates at seleted fan 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 ...

Page 11: ...an 45 minutes of heating operation More than 10 min running of compressor Outdoor Pipe Temp Indoor Fan Compressor 4 Way Valve ON ON ON ON OFF ON OFF HOT START ON ON OFF OFF ON Within 12minutes Defrost Defrost More than 45 minutes of heating operation More than 10 min running of compressor 7 Self Diagnosis Function CHECK will flash in the remote controller display when a problem occurs Then please ...

Page 12: ... to get a slope to drain as figure The place shall easily connect with the outdoor unit The place where the unit is not affected by an electrical noise The place where air circulation in the room will be good There should not be any heat source or steam near the unit 2 Outdoor unit If an awning is built over the unit to prevent direct sunlight or rain exposure be careful that heat radiation from t...

Page 13: ... following actions Make sure that the ventilation fan for smoke collecting hood on a cooking table has sufficient capac ity so that it draws oily steam which should not flow into the suction 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 oil steam 2 Avoid installing air conditioner in such circumstances where ...

Page 14: ...above the ceiling correctly Apply a joint canvas between the unit and duct to absorb unnecessary vibration Apply a filter Accessory at air return hole Install the unit leaning to a drainage hole side as a figure for easy water drainage A place where the unit will be leveled and that can support the weight of the unit A place where the unit can withstand its vibration A place where service can be e...

Page 15: ... sus pension bolts for locking the suspension bolts on the ceiling Mount the suspension bolts to the set anchor firmly Secure the installation plates onto the suspen sion bolts adjust level roughly using nuts wash ers and spring washers Tighten the nut and bolt to prevent unit falling CAUTION Local supply Set anchor Plate washer M10 Spring washer M10 Nut W3 8 or M10 Suspension bolt W3 8 or M10 1 S...

Page 16: ...r approval The room temperature sensor of the thermostat for temperature control 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 control cord Keep the remote control cord away from the refrigerant piping and the drain piping To protect t...

Page 17: ... the control panel 4 In Australia the length of power supply cord measured from the entry of the power supply cord to the middle of live pin on the power plug should be over 1 8m Terminals on the indoor unit 1 2 4 5 3 Terminals on the outdoor unit 1 2 4 5 3 The power cord connected to the outdoor unit should be complied with the following specifications Rubber insulation type H05RN F approved by H...

Page 18: ...r electrical con nection between the indoor and outdoor unit Remove two screws Use the cord clamper to fix the cord Perform the electrical wiring work according to the electrical wiring connection All wiring must comply with local requirements Select a power source that is capable of supplying the current required by the air conditioner Use a recognized circuit breaker 25A 48K between the power so...

Page 19: ...ove burrs in order to avoid to let burrs drop in the tubing 3 Putting nut on Remove flare nuts attached to indoor and out door 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 indicat ed dimension in the table above 5 Check ...

Page 20: ... located below the outdoor 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 service ports of both the liquid and gas side valves Use two wrenches and tighten with regular tor...

Page 21: ...lination so water will drain out Alway lay the drain with downward inclina tion 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 sh...

Page 22: ...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 crip for thermal insulator Local supply Union for liquid pipe Refrigerant pipe and thermal insulator Local supply Un...

Page 23: ... 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 voltage current presence of abnorm...

Page 24: ...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 25: ...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 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 ind...

Page 26: ...s 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 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 B...

Page 27: ...rvice 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 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 refrig...

Page 28: ...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 29: ...rant 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 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 char...

Page 30: ...ature 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 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 ...

Page 31: ...sformer AC220V Is the input voltage of IC01D DC14V Check the FUSE and the wiring diagram Is the output voltage of IC01D DC12V Is the PIN 31 32 of MICOM DC5V Exchange MICOM YES NO Check the main P C B pattern NO NO Check the D02D D05D NO YES Exchange the transformer Is shorted the transformer output NO YES Is the output voltage of IC02D DC5V NO Exchange IC01D Exchange IC02D Is the output voltage of...

Page 32: ...ctor CN MOTOR YES Is the each Relay any problem YES NO YES It is normal operation Exchange IC01M Exchange Relay NO YES YES YES Is the LCD operated normally Is the terminal of wired Remocon T2 DC12V Is the pin 31 32 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 Po...

Page 33: ...GE Internal Use Only Possible Trouble 4 Ineffective Heating 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 CN AC1 2 Check RY 4Way NO Is 4way valve operated ...

Page 36: ...ed Only for training and service purposes LGE Internal Use Only Exploded View and Replacement Parts List 1 Indoor Unit MODEL LB E4880HL 330870 152302 268711B 35211CB 35211CA 267110 249951 346810 336610A 336610B 359012B 359012A 354210 W0CZZA 263230A 263230B ...

Page 37: ...ronics Inc All right reserved Only for training and service purposes LGE Internal Use Only MODEL LB E4880HL NW8LAP 330870 268711B 35211CB 35211CA 267110 249951 346810 336610A 336610B 359012B 359012A 354210 W0CZZA 263230A 263230B ...

Page 38: ...nd service purposes LGE Internal Use Only 2 Outdoor Unit MODEL LB E4880HL 435512 546810 649950 437212 430410 268711C 552203B 548490 552203A 435301 559010 137213 554031A 554031B W6920 W6640A W0CZZB 552202 Applied for Heating Model 561410 566000 435511 437210 554160 W6640B W6640B ...

Page 39: ...P NO 3828A30014R JANUARY 2009 ...

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