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Only for training and service purposes

LGE Internal Use Only

Air Conditioner Service Manual

CONTENTS

Part 1 General Information.........................................................................................................2

1. Safety Precautions........................................................................................................3

2. Model Line Up................................................................................................................6

3. Nomenclature ................................................................................................................7

Part 2 Functions & Controls ......................................................................................................8

1. List of Functions & Controls........................................................................................9

2. Air Flow .......................................................................................................................12

3. Air Purifying.................................................................................................................14

4. Installation Functions.................................................................................................15

5. Reliability .....................................................................................................................18

6. Convenience Functions & Controls .........................................................................19

Part 3 Control logic....................................................................................................................24

1. Compressor.................................................................................................................25

2. Step(frequency) control..............................................................................................26

3. Reversing valve operaton ..........................................................................................27

4. Discharge pipe control ...............................................................................................28

5. Input Current Control..................................................................................................29

6. Outdoor Fan Control...................................................................................................30

7. Defrost Control............................................................................................................31

8. LEV Control .................................................................................................................32

9. Oil restoration operation ............................................................................................34

10. Compressor warm-up control logic ........................................................................34

11. Heat sink control .......................................................................................................35

Part 4 Test Run..........................................................................................................................36

1. Check before Test Run ..............................................................................................37

2. Test Run Flow chart ...................................................................................................38

3. Test Runing..................................................................................................................39

Part 5 Trouble Shooting Guide ...............................................................................................40

1. Self-diagnosis Function ......................................................................................41

2. Pump Down ..........................................................................................................43

3. Evacuation............................................................................................................44

4. Gas Charging .......................................................................................................45

5. Cycle Part .............................................................................................................46

6. Electronic Parts....................................................................................................47

LG Multi-Inverter Type User Manual

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