Electrical Control Function
110 Electrical Control
1.3.3.3 Defrosting mode：
For 1-phase outdoor units:
Condition of defrosting:
AC will enter defrosting mode if any of the following items is satisfied.
A: T3<0℃ and the compressor keeps running over 45 minutes. Meanwhile T3＜-3℃ for 3minutes.
B: 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 ending defrosting:
If any one of the following items is satisfied, the defrosting will terminate and the machine will turn to normal
heating mode.
A: T3 rises to be higher than 20℃.
B: The machine has run for 10 minutes in defrosting.
Defrosting action：
For 3-phase outdoor units:
Condition of defrosting:
T3<0℃ and the compressor keeps running over 45 minutes. Meanwhile T3＜-3℃ for 3minutes.
Condition of ending defrosting:
If any one of the following items is satisfied, the defrosting will terminate and the machine will turn to normal
heating mode.
A: T3 rises to be higher than 20℃.
B: The machine has run for 10 minutes in defrosting.
Defrosting action：
The compressor is running, and 4-way valve and outdoor fan stop. The indoor fan works as anti-cold wind
procedure. When defrosting is over, the compressor keeps running and the 4-way valve and outdoor fan will
start up.
Setting defrosting time
45S 45S
Compressor
4 way valve 40S
40S
Outdoor fan
Indoor fan
10S
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