Defrost Operation Control - Fujitsu ASU9RL Service Instruction

19. 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 14.
(Table 14 : Condition of starting Defrost Operation)
ASU9 / 12RL
2. CONDITION OF THE DEFROST OPERATION COMPLETION
Defrost operation is released when the conditions become as shown in Table 15.
(Table 15 : Defrost Release Condition)
ASU9 / 12RL
Compressor operating time
Less than 25 minutes
Does not operate
Release Condition
Outdoor heat exchanger temperature sensor value is higher than
61°F(16°C) or Compressor operation time has passed 15 minutes.
05-14
25 minutes to
After 4 hours
4 hours
21°F(- 6°C) 27°F(- 3°C)