Haier AC142ACBEA Service Manual page 75

7.2 Defrost operation Flow Chart
1. Indoor unit: when defrosting, while the coil temperature<23 , the indoor fan motor
stops.
2. Defrosting condition: (Th= ambient temperature, Tp= coil temperature)
-22 Th<-10 , Tp -18
-10 Th<-5 , Tp -15
-5 Th<0
0 Th<6
Th>6 Tp -3
After 30 minutes running in heating mode, if the above condition occurs (random
one), the machine will do defrosting operation after 5 minutes.
3. Process of defrosting
>When starting defrosts operation, the compressor stops and also the outdoors fan
motor.
>After 55s of defrost starting, the 4-way valve will stop.
>After 1 minute of defrosts starting, the compressor starts running.
>When defrost operation finish, the compressor stops and after 30s, the outdoor fan
motor starts running.
>After 60s of defrost finishing, the 4-way valve starts running and also the
compressor.
>One defrosting operation will last 10 minutes.
ON
outdoor fan motor
OFF
ON
compressor
OFF
ON
4-way valve
OFF
defrosting
start
Tp -12
Tp -8
55S 5S 9min 30S
defrosting
finish
30S