Defrost Operation Control - Fujitsu ASYG07LMCE Service Manual

22. DEFROST OPERATION CONTROL

1. CONDITION OF STARTING THE DEFROST OPERATION
The defrost operation starts as shown in the following Table 23.
(Table 23 : Condition of starting Defrost Operation)
Normal defrost
Integrating defrost
2. CONDITION OF THE DEFROST OPERATION COMPLETION
Defrost operation is released when the conditions become as shown in Table 24.
(Table 24 : Defrost Release Condition)
Outdoor heat exchanger temperature sensor value is higher than +16°C or
Compressor operation time has passed 15 minutes.
Compressor integrating operation time
Less than 25 minutes
Does not operate
Compressor integrating operation time
More than 240 minutes
(For continuous operation)
Outdoor heat exchanger
temperature below -3°C
If the compressor continuous operation time is less than 10 minutes,
the OFF number of the compressor is counted.
If any defrost operated, the compressor OFF count is cleared.
Release Condition
01-17
More than 25 minutes
Outdoor heat exchanger temp. < -17°C
(at outside air temp. > -10°C)
=
Outdoor heat exchanger temp. < Outside air temp.- 7°C
or
Outdoor heat exchanger temp. < - 20°C
More than 213 minutes
(For continuous operation)
Outdoor heat exchanger
temperature below -5°C
=
=
=
(at outside air temp. < -10°C)
Less than 10 minutes
( For intermittent operation )
OFF count of the compressor
40 times