Midea MS9A-05CR-QD0 Service Manual page 48

8.4.3.4 Defrosting mode：
For MS9A-21HR-QB6W and MA9A-24HR-QB4W models:

Condition of defrosting:
AC will enter defrosting mode if any of the following items is satisfied.
(1) When T3＜TC1℃, if the compressor keeps running over 45 minutes and T3＜TC3℃ for 3
minutes.
(2) After the last defrosting, the time that the outdoor fan is off but the compressor is on in high T2
protection cumulates up to 90 minutes.

Condition of defrosting stop:
If any one of the following items is satisfied, the defrosting will terminate and the machine will turn to
normal heating mode.
(1)T3 rises to be higher than TC2.
(2)The machine has run for 10 minutes in defrosting.

Defrosting action：
For other models:

Condition of defrosting:
AC will enter defrosting mode if any of the following items is satisfied.
(1) Both A and B are satisfied
A: The compressor keeps running for 40 minutes.
B: The evaporator coil temp.T2-Indoor room temp.T1 meets the below table.
℃
High speed
Medium speed
T2－T1
＜TH
DEFROST
＜TM
DEFROST
46