Midea MA9A-24HR-QB4W, Service Manual

CONTENTS 

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

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

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

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

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

3.1 Indoor Units ................................................................................................................................... 9

3.2 Outdoor Units .............................................................................................................................. 12

4. Refrigerant Cycle Diagram ....................................................................................................................... 14

5. Wiring Diagram .......................................................................................................................................... 16

5.1 Indoor Units ................................................................................................................................. 16

5.2 Outdoor Units .............................................................................................................................. 21

6. Installation details ...................................................................................................................................... 29

6.1 Wrench torque sheet for installation ........................................................................................... 29

6.2 Connecting the cables ................................................................................................................ 29

6.3 Pipe length and the elevation ..................................................................................................... 30

6.4 Installation for the first time ......................................................................................................... 31

6.5 Adding the refrigerant after running the system for many years ................................................ 34

6.6 Re-installation while the indoor unit need to be repaired ........................................................... 35

6.7 Re-installation while the outdoor unit need to be repaired ......................................................... 37

7. Operation characteristics ......................................................................................................................... 40

8. Electronic function .................................................................................................................................... 41

8.1 Abbreviation ................................................................................................................................ 41

8.2 Display function ........................................................................................................................... 41

8.3 Main Protection ........................................................................................................................... 42

8.4 Operation Modes and Functions ................................................................................................. 43

9. Troubleshooting ......................................................................................................................................... 52

9.1 Indoor unit error display .............................................................................................................. 52

9.2 Diagnosis and Solution ............................................................................................................... 54