Multi Zone Service Manual - General

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Only for training and service purposes

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 ......................................................................................................9

1. List of Functions & Controls......................................................................................10

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

3. Installation Functions.................................................................................................14

4. Reliability .....................................................................................................................16

5. Convenience Functions & Controls .........................................................................17

Part 3 Control logic....................................................................................................................22

1. Compressor.................................................................................................................23

2. Step(frequency) control..............................................................................................24

3. Reversing valve operaton ..........................................................................................25

4. Discharge pipe control ...............................................................................................26

5. Input Current Control..................................................................................................27

6. Outdoor Fan Control...................................................................................................28

7. Defrost Control............................................................................................................29

8. LEV Control .................................................................................................................30

9. Oil restoration operation ............................................................................................32

10. Compressor warm-up control logic ........................................................................32

11. Heat sink control .......................................................................................................33

Part 4 Test Run..........................................................................................................................34

1. Check before Test Run ..............................................................................................35

2. Test Run Flow chart ...................................................................................................36

3. Test Runing..................................................................................................................37

Part 5 Trouble Shooting Guide ...............................................................................................38

1. Self-diagnosis Function ......................................................................................39

2. Pump Down ..........................................................................................................41

3. Evacuation............................................................................................................42

4. Gas Charging .......................................................................................................43

5. Cycle Part .............................................................................................................44

6. Electronic Parts....................................................................................................45