Sinclair ASC-18A - Page 33

DC INVERTER U-MATCH AIR CONDITIONERS CONTROL
2.4 Defrosting
The conditions for starting the defrosting are as follows:
The defrosting is started when one of the following three conditions is satisfied:
 The total time for outdoor defrost sensor to run below 3 is longer than 40 minutes and this ℃
temperature is kept lower than -6 for over 3 minutes.℃
 The outdoor temperature sensor keeps lower than 3  for at least 80 minutes and keeps lower than
-4  for at least 3 minutes.
 The outdoor temperature sensor keeps lower than 3  for at least 120 minutes and keeps lowers
than -3  for at least 3 minutes
The conditions for ending the defrosting are as follows:
The defrosting is ended when one of the following three conditions is satisfied:
When the temperature of o① utdoor heat exchanger rises to higher than 10 .℃
When the temperature of outdoor heat exchanger rises to higher than 8 and this lasts for over 80 ② ℃
Variable Frequency
Compressor
Outdoor fan
Indoor fan
4-way valve
Heating / Defrosting Time Sequence Chart
Defrosting marking
Defrosting frequenc
y
Conditions for
ending the defrost
A
djust per PI
High fan
Energized
De-energized
A
uxiliary powe
r
A
cc. to outdoor fan control logic
Fixed step
Y
A
djust according to control logic
Cold air prevention
A
cc. to the conditions fo
r
starting the auxiliary power
Meet the conditions fo
r
ending the defrost
Time
Defrosting ends
30s
3min
10s