25
① unit start defrost shall meet one of the following conditions：
a. compressor cumulate running time over 30 minutes and it continuous running over 3 minutes, the
temperature of coil pipe of the outdoor units is equal to or less than －15℃ for one minutes (Tp
2
≤-15℃).
b. compressor cumulate running time over 40 minutes and it continuous running over 3 minutes, the
temperature of coil pipe of the outdoor units is equal to or less than －5℃ for one minutes (Tp
2
≤-15℃).
c. Air conditioner first power on or it wait over 30 minutes ,the temperature of coil pipe of the outdoor units is
equal to or less than －2℃ (Tp
2
≤-15℃)
②end defrost condition(meet one of follows)
a. the temperature of coil pipe of the outdoor units is more than 15℃ (Tp
2
≥-15℃).
b. defrost time have fifteen minutes.
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TP2
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