Defrost Operation Control - Fujitsu AW*Z24LBC Service Instruction

20. DEFROST OPERATION CONTROL

(1). CONDITION OF STARTING THE DEFROST OPERATION
The defrost operation starts when the outdoor heat exchanger temperature sensor detects
the temperature lower than the values shown in Table 15.
(Table 15 : Condition of starting Defrost Operation)
1 time defrosting
ST
after starting
operation
ND
Defrosting after 2
time upon starting
operation
(2). CONDITION OF THE DEFROST OPERATION COMPLETION
Defrost operation is released when the conditions become as shown in Table 16.
(Table 16 : Defrost Release Condition)
AW * Z24LBC
Less than 17 minutes 17 to 60 minutes 60 minutes to 4 hours
AW * Z24LBC Does not operate
Less than 35 minutes
AW * Z24LBC Does not operate
Outdoor heat exchanger temperature sensor value is higher than 13 C or
Compressor operation time has passed 15 minutes.
Compressor operating time
- 9 C
Compressor operating time
35 minutes to
4 hours
- 6 C
Release Condition
05-16
After 4 hours
- 5 C
After 4 hours
- 3 C
- 3 C