Sinclair ASCU-12A, Service Manual

Page: 31 / 202

U-MATCH AIR CONDITIONERS CONTROL
30
2.4 Defrosting
ON
ON
OFF
ON
OFF
OFF
OFF
ON
ON ON
ON
ON
ON
Defrosting start conditions: after the heating operation runs for an accumulated period of 44
minutes and the compressor continues to operate for 4 hours and 50 seconds, and a one-minute
duration of T
cond.
≤
-5 ℃ is detected, the unit begins defrosting. If an auxiliary heater is available, it
must be stopped firstly, and after 10 seconds, the four-way valve, the indoor fan, the outdoor fan
and the compressor will run compulsively.
Defrosting completion conditions: when defrosting runs 10 minutes or T
cond.
≥
10 ℃ , defrosting will
be completed. In such case, the four-way valve is running, the outdoor fan is running, the
compressor is running compulsively, and the indoor fan operates according to cooling fan proof
conditions.
Compressor
Outdoor fan
Indoor fan
4-way valve
Auxiliary heating
Defrosting
Enter the
defrosting mode
Withdraw the
defrosting mode
Operation at a
set speed
Operation under
normal conditions
Cold blast prevention
Time