Midea 9V SERIES Service Manual Download Page 2

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CONTENTS

1. Precaution .................................................................................................................................................... 1

1.1 Safety Precaution .......................................................................................................................... 1

1.2 Warning ......................................................................................................................................... 1

2. Function ........................................................................................................................................................ 6

3. Dimension .................................................................................................................................................... 9

3.1 Indoor Unit ..................................................................................................................................... 9

3.2 Outdoor Unit ................................................................................................................................ 10

4. Refrigerant Cycle Diagram ........................................................................................................................ 11

5. Wiring Diagram .......................................................................................................................................... 12

5.1 Indoor Unit ................................................................................................................................... 12

5.2 Outdoor Unit ................................................................................................................................ 14

6. Installation details ...................................................................................................................................... 18

6.1 Wrench torque sheet for installation ........................................................................................... 18

6.2 Connecting the cables ................................................................................................................ 18

6.3 Pipe length and the elevation ..................................................................................................... 18

6.4 Air purging with vacuum pump .................................................................................................... 19

6.5 Pumping down (Re-installation) .................................................................................................. 20

6.6 Re-air purging (Re-installation) ................................................................................................... 22

6.7 Balance refrigerant of the 2-way, 3-way valves .......................................................................... 23

6.8 Evacuation .................................................................................................................................. 24

6.9 Gas charging ............................................................................................................................... 25

7. Operation characteristics ......................................................................................................................... 26

8. Electronic function .................................................................................................................................... 27

8.1 Abbreviation ................................................................................................................................ 27

8.2 Display function ........................................................................................................................... 27

8.3 Main Protection ........................................................................................................................... 28

8.4 Operation Modes and Functions ................................................................................................. 28

9. Troubleshooting ......................................................................................................................................... 37

9.1 Indoor Unit Error Display ............................................................................................................. 37

9.2 Diagnosis and Solution ............................................................................................................... 38