Chigo 38B Service Manual page 92

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
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
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
②end defrost condition(meet one of follows)
a. the temperature of coil pipe of the outdoor units is more than 15℃ (Tp
b. defrost time have fifteen minutes.
TP2
c o m p r e s s o r
o u t d o o r
b l o w e r f a n
d o o r
b l o w e r f a n
≤-15℃)
2
Tr
25
≥-15℃).
2
≤-15℃).
2
≤-15℃).
2