Midea 9V SERIES - 8.4.3.3 Defrosting Mode; Defrosting Initiation Conditions; Defrosting Stop Conditions

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When T1-Ts≤0℃, transfer to medium speed,
When T1-Ts>2℃, transfer to low speed.
8.4.3.3 Defrosting mode
：
Condition of defrosting:
If any one of following items is satisfied, defrosting will start.
Condition 1: Both the following conditions are satisfied:
A: If the working time of the compressor accumulates to 42 min and one continuous
working time is more than 390s.
B: Check the temperature difference between T2 and T1
℃
Fan speed
T2-T1 Note
High
＜
TH
DEFROST
If indoor fan is in high speed and T2-T1< TH
DEFROST
, start defrosting
Medium
＜TM
DEFROST
If indoor fan is in medium speed and T2-T1<1 TM
DEFROST
,
start defrosting
Low
＜
TL
DEFROST
If indoor fan is in low speed and T2-T1<
TL
DEFROST
, start defrosting
Breeze or indoor
fan stop
/
If indoor fan is breezing or stopped, start defrosting
While TH
DEFROST
= 14℃ ，TM
DEFROST
= 15℃， TL
DEFROST
= 16℃ for 7K model ;
TH
DEFROST
= 15℃ ，TM
DEFROST
= 16℃， TL
DEFROST
= 17℃ for 9K and 12K model ;
TH
DEFROST
= 17℃ ，TM
DEFROST
= 18℃， TL
DEFROST
= 19℃ for 18K model ;
Condition 2: If the accumulated time of outdoor fan stopped but the compressor keep working due to
evaporator high temperature protection mode reaches 90 min from the end of last defrosting mode.
Condition of defrosting stop:
If any one of following conditions occurs, the defrosting will finish and the machine will turn to normal
heating mode.
Condition 1: Reached the defrosting time.
（a） If the defrosting mode is based on condition1, and the B condition is reached before
A condition, the defrosting time is 10min, otherwise the defrosting time is 7.5min.
（b） If the defrosting mode is based on condition 2, the defrosting time is 10min.
（c） If the previous 3 times defrosting time is 7.5min, the forth defrosting time will be