Lg General Wall Mounted-Inverter Type User Manual

Room Air ConditionerSVC MANUAL(General)MODEL : General Wall Mounted-Inverter TypeCAUTIONBefore Servicing the unit, read the safety precautions in this

10 Room Air ConditionerPart 2 Functions & Controls2. Basic Mode Controls2.1 Cooling ModeSettingTemp. -0.5°C(-1°F)+0.5°C(1°F)Comp. OFFThermo ONTh

Service Manual 11Part 2 Functions & Controls2.3 Healthy Dehumidification operation• When the dehumidification operation is set by the remote co

12 Room Air ConditionerPart 2 Functions & Controls3. Special Mode Controls3.1 Jet Cool operation• In the heating mode or Fuzzy operation, the Je

Service Manual 13Part 2 Functions & Controls4. Utility Functions4.1 Forced operation• To operate the appliance manually in case when the remote

14 Room Air ConditionerMode2Mode3Mode4Mode5Mode6Mode7Mode8Mode9OPENCLOSED8°Cooling Operation120°Mode2Mode3Mode4Mode5Mode6Mode7Mode8Mode9OPENCLOSED8°He

Service Manual 15Part 2 Functions & Controls4.6 Sleep mode Auto control • When the set sleep time is reached set time of [1,2,3,4,5,6,7hour] i

16 Room Air ConditionerPart 2 Functions & Controls5.1 Five Seconds Stand-by (fan)• The indoor unit fan rotates after 5 seconds when unit is tur

Service Manual 17Part 2 Functions & Controls5.5 Automatic defrost 5.5.1 9,12kBtu/h Model• While in heating mode operation in order to protect

18 Room Air ConditionerPart 2 Functions & Controls5.5.2 18,24,30kBtu/h Model• Starting to the defrosting operation1) Defrost operation will be s

Service Manual 19Part 2 Functions & Controls• Defrosting Control Algorithm1) Lowering the compressor frequency when starts the defrosting opera

2 Room Air ConditionerAir Conditioner Service ManualCONTENTSPart 1 General Information1. Safety Precautions...

20 Room Air ConditionerPart 2 Functions & Controls5.6 Power Relay Control• Power relay turns on 1 second later after the power is supplied to t

Service Manual 21Part 2 Functions & Controls5.8 Overheating Protection (Power Module)5.8.1 9,12kBtu/h Model• If the temperature of the heat si

22 Room Air ConditionerPart 2 Functions & Controls5.8.2 18,24,30kBtu/h Model• Function : Power module failure protection by checking the tempera

Service Manual 23Part 2 Functions & Controls5.9 Total Current Control (Over Current Protection)5.9.1 9,12kBtu/h Model1) CT1 control• If the ope

24 Room Air ConditionerPart 2 Functions & Controls5.9.2 18,24,30kBtu/h Model1) Detection : check the output DC voltage of Current Transformer(C

Service Manual 25Part 2 Functions & Controls5.10 DC Peak control5.10.1 DC Peak Current Error by a fault signal of IPM• If the operating curren

26 Room Air ConditionerPart 2 Functions & Controls5.11.2 Inverter Compressor (18,24,30kBtu/h Model)1) There can be two situations(a) Sensor is f

Service Manual 27Part 2 Functions & Controls5.11.3 Constant Compressor (only 30kBtu/h Model)1) There can be two situations(a) Sensor is failed

28 Room Air ConditionerPart 2 Functions & Controls5.12 Low Ambient control5.12.1 9,12kBtu/h Model• If outdoor temperature drops below certain te

Service Manual 29Part 2 Functions & Controls5.14 Oil equalizing control(30kBtu/h Model)Operating condition :1) When the continuous inverter com

Service Manual 31. Safety Precautions ...42

30 Room Air ConditionerPart 3 Test Run1. Check before Test Run...

Service Manual 31Part 3 Test RunCheck to see whether there is any refrigerant leakage, and check whether the power or transmissioncable is connecte

32 Room Air ConditionerIs cold air discharged formore than 3 minutes ?STARTTest operation for indoor unitOperation mode changeto Heating modeOperate t

Service Manual 33Part 3 Test Run1. Check that all tubing and wiring have been properly con-nected.2. Check that the gas and liquid side service val

34 Room Air ConditionerPart 4 Trouble Shooting 1. 2-Way, 3-Way Valve ...

Service Manual 35Part 4 Trouble Shooting 2-way Valve (Liquid Side) 3-way Valve (Gas Side)Shaft position Shaft position Service port Closed Closed C

36 Room Air ConditionerPart 4 Trouble Shooting • Procedure (1) Confirm that both the 2-way and 3-way valvesare set to the open position. – Remove

Service Manual 37Part 4 Trouble Shooting • Procedure (1) Connect the vacuum pump to the center hoseof charge set center hose (2) Evacuation for app

38 Room Air ConditionerPart 4 Trouble Shooting LoChargingcylinder Outdoor unitIndoor unitLiquid sideGas sideOpen3-Wayvalve3-WayvalveOPENOpenCheck va

Service Manual 39Part 4 Trouble Shooting Trouble analysis1. Check temperature difference between intake and discharge air, and operating current.Al

4 Room Air ConditionerPart 1 General Information 1. Safety Precautions 1.1 Cautions in Repair To prevent injury to the user or other people and prop

40 Room Air ConditionerPart 4 Trouble Shooting 2. Check temperature and pressure of refrigeration cycle.1. The suction pressure is usually 8.5~9.5 k

Service Manual 41Part 4 Trouble Shooting The Product doesn’t operate at all. (9~30kBtu/h Model)Turn off the main power and wait until LED on outdoo

42 Room Air ConditionerPart 4 Trouble Shooting Turn on main power.While the compressor has been stopped, the compressor does not operate owing to th

Service Manual 43Part 4 Trouble Shooting Turn on the main power.When in air circulation mode, compressor/outdoor fan is stopped.Turn off main power

44 Room Air ConditionerPart 4 Trouble Shooting Turn on the main power.When in air circulation mode, compressor/outdoor fan is stopped.Turn off main

Service Manual 45Part 4 Trouble Shooting When indoor Fan does not operate.(9~30kBtu/h Model)Trouble 5Check the SSR high speed operation by remote c

46 Room Air ConditionerPart 4 Trouble Shooting 7. Self-diagnosis Function Error Indicator• The function is to self-diagnoisis airconditioner and ex

Service Manual 47Part 4 Trouble Shooting 18,24,30kBtu/h ModelIndoor Error00 No Error ON01 Indoor Room themistor error 1time OFF02 Indoor in-pipi

48 Room Air ConditionerPart 4 Trouble Shooting Case of errorLED02G(Green)LED01G(Red)ContentsErrorcodeCT Circuit malfunctionOpen / ShortOpen / ShortO

Service Manual 49 Troubleshooting Guide(9,12kBtu/h Model)Part 4 Trouble Shooting Description Cause of error1• Indoor TH. (sensor) is short or open

Service Manual 5Part 1 General Information Do not turn on the breaker when the front panel and cabinet are removed.Be sure to ground the air condit

50 Room Air ConditionerPart 4 Trouble Shooting 4• Heat-sink TH. is damaged(short or open). • Heat-sink Temp. is over 95°C(203°F)• Damage or defect

Service Manual 51Part 4 Trouble Shooting 5• Wrong or missing wiring between indoor and outdoor unit cable• Defect of communication components in in

52 Room Air ConditionerPart 4 Trouble Shooting Cause of error6• Supplied power is not normal• Comp Connector (CN-U,V,W) is disconnected or inserted

Service Manual 53Part 4 Trouble Shooting 7• Supplied power is not normal• Indoor/outdoor fan is locked• Too much refrigerant• Defect in current sen

54 Room Air ConditionerPart 4 Trouble Shooting 8• Indoor fan is locked or separated• Fan connector is not connected to indoor pcb assembly• Defectiv

Service Manual 55Part 4 Trouble Shooting 10• D_pipe TH. is short or open • D_pipe TH. is not connected to the outdoor pcb assembly• Damage or defec

56 Room Air ConditionerPart 4 Trouble Shooting 1) Troubleshooting CH01, CH02, CH06Ω10kΩCheck the resistance Check the voltageV2.5VDC010206Indoor air

Service Manual 57Part 4 Trouble Shooting 2) Troubleshooting CH05, CH5305/53Communication(Indoor → Outdoor)• Communication poorly• Power input AC 20

58 Room Air ConditionerPart 4 Trouble Shooting 3) Troubleshooting CH21ΩCompCopperpipeResistance(Ω) at 20°C(68°F)Resistance(Ω) at 20°C(68°F)0.640.640

Service Manual 59Part 4 Trouble Shooting 4) Troubleshooting CH21, CH22V+-+-+-2122Max. C/TC/T Internal circuitOver current (14A )Initial current err

6 Room Air ConditionerPart 1 General Information Check to see if the parts are mounted correctly and wires are connected.Improper installation and c

60 Room Air ConditionerPart 4 Trouble Shooting 5) Troubleshooting CH23, CH28V2328DC LinkLow voltage.DC LinkHigh voltage• DC link volt. is 140VDC .•

Service Manual 61Part 4 Trouble Shooting 6) Troubleshooting CH24, CH25CN TRNAS1CN PRESSTRANS150Hz, DC12V2425Press S/W OpenInput voltage• Low / High

62 Room Air ConditionerPart 4 Trouble Shooting 7) Troubleshooting CH26, CH27ECBECBECB2627DC CompressorPositionPSC Fault• Compressorposition detect e

Service Manual 63Part 4 Trouble Shooting 8) Troubleshooting CH32, CH33, CH40LEV Openness(Pulse)COMP Frequency(Hz)Toff(105) °CT1(90) °CT2(95) °COFFN

64 Room Air ConditionerPart 4 Trouble Shooting 9) Troubleshooting CH41, CH44, CH45, CH46, CH47, CH65Ω414445464765D-pipe sensor (Inverter)Air sensorC

Service Manual 65Part 4 Trouble Shooting 10) Troubleshooting CH51, CH605160Over capacityEEPROMCheck sum• Over capacityCombination• Check sum error•

66 Room Air ConditionerPart 4 Trouble Shooting 11) Troubleshooting CH61, CH626162Condenserpipe sensortemp. highHeat sink sensortemp. high• Condenser

P/NO : MFL41161601AUGUST, 2007

Service Manual 7Part 1 General Information 2. Nomenclature 2.1 Global Model NameCode Type Code of Model Meaning1 Production Center, A~Z L: Chang-

8 Room Air ConditionerPart 2 Functions & Controls1. List of Controls & Functions .....

Service Manual 9Part 2 Functions & Controls1. List of Functions & ControlsCooling ModeHeating ModeHealthy DehumidificationAutomatic operat