LG Single "A" - Table of Contents

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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.........................................................................................................................11

3. Air purifying.................................................................................................................13

4. Installation Functions.................................................................................................16

5. Reliability .....................................................................................................................19

6. Convenience Functions & Controls .........................................................................20

Part 3 Control logic ....................................................................................................................31

1. Compressor.................................................................................................................32

2. Step(frequency) control..............................................................................................34

3. Reversing valve operaton ..........................................................................................37

4. Discharge pipe control ...............................................................................................38

5. Input Current Control..................................................................................................39

6. Outdoor Fan Control...................................................................................................41

7. Defrost Control............................................................................................................43

8. LEV Control .................................................................................................................44

9. Oil restoration operation ............................................................................................50

10. Compressor warm-up control logic ........................................................................50

11. Heat sink control.......................................................................................................51

Part 4 Test Run ..........................................................................................................................52

1. Check before Test Run ...............................................................................................53

2. Test Run Flow chart ....................................................................................................54

Part 5 Trouble Shooting Guide ................................................................................................56

1. Self-diagnosis Function .............................................................................................57

2. Pump Down .................................................................................................................59

3. Evacuation...................................................................................................................60

4. Gas Charging...............................................................................................................61

5. Cycle Part.....................................................................................................................62

6. Electronic Parts...........................................................................................................63

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