Auto fan action in heating mode.
8.4.3.4 Defrosting mode
Conditions of defrosting:
Condition 1: If T4＞0 ℃,
When the units are running, if any one of the following conditions is satisfied, the unit starts defrosting:
① If the accumulated time of the unit working within T3＜3 ℃reached 40 minutes and T3 keeps lower
than -6 ℃ over 3 minutes.
② If the accumulated time of the unit working within T3＜3 ℃reached 80 minutes and T3 keeps lower
than -4 ℃ over 3 minutes.
Condition 2: If T4＜0 ℃,
If satisfied any item of the condition 1 and the T2 temperature has decreased 5℃, starts defrosting.
Note: T2 is the maximum value of the evaporator temperature during the anti-cold wind function. It’s
recorded by the system automatically.
Condition 3:
No matter what value T4 is, if the accumulated time of the unit working within T3＜3 ℃reached 120
minutes and T3 keeps lower than -2℃ over 3 minutes, starts defrosting.
Condition of ending defrosting:
If any one of following items is satisfied, defrosting will stop and the machine will turn to normal heating
mode.
① For the 18K unit : T3 >12℃; For the 24K unit:: T3 >15℃;
② T3>8 ℃ and remains for 80 seconds.
③ The defrosting time lasts 10min.
Defrosting action：
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