Midea MOF-24HDN1-QC2W, Service Manual

CONTENTS 

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

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

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

2. Function .................................................................................................................................................... 4

3. Dimension ................................................................................................................................................. 6

3.1  Indoor Unit ........................................................................................................................................................... 6

3.2  Outdoor Unit ........................................................................................................................................................ 6

4. Specification ............................................................................................................................................. 7

5. Refrigerant cycle diagram ....................................................................................................................... 8

6. Wiring diagram ......................................................................................................................................... 9

6.1  Indoor Unit ........................................................................................................................................................... 9

6.2  Outdoor Unit ...................................................................................................................................................... 10

7. Installation details ................................................................................................................................... 11

7.1  Wrench torque sheet for installation .................................................................................................................. 11

7.2  Connecting the cables ....................................................................................................................................... 11

7.3  Pipe length and the elevation ............................................................................................................................ 11

7.4    Air purging of the piping and indoor unit ............................................................................................................ 11

7.5  Pumping down (Re-installation) ......................................................................................................................... 13

7.6  Re-air purging (Re-installation) .......................................................................................................................... 14

7.7  Balance refrigerant of the 2-way, 3-way valves ................................................................................................. 15

7.8  Evacuation ......................................................................................................................................................... 16

7.9  Gas charging ..................................................................................................................................................... 17

8. Electronic function ................................................................................................................................ 18

8.1  Abbreviation ...................................................................................................................................................... 18

8.2  Display function ................................................................................................................................................. 18

8.3  Protection .......................................................................................................................................................... 18

8.4  Fan-Only Mode .................................................................................................................................................. 19

8.5  Cooling Mode .................................................................................................................................................... 19

8.6  Drying mode ...................................................................................................................................................... 21

8.7  Heating mode .................................................................................................................................................... 22

8.8  Auto mode function ............................................................................................................................................ 25

8.9  Forced operation function .................................................................................................................................. 25

8.10    Action of 4-way valve ....................................................................................................................................... 25

8.11  Two speeds outdoor fan function ..................................................................................................................... 25

8.12  Timer function .................................................................................................................................................. 26

8.13  Sleep function mode ........................................................................................................................................ 26

8.14  Auto-Restart function ....................................................................................................................................... 26

9. Troubleshooting ..................................................................................................................................... 27

9.1  Indoor Unit Error Display ................................................................................................................................... 28

9.2  Diagnosis and Solution ...................................................................................................................................... 29

9.3  Key parts checking. ........................................................................................................................................... 32