Defrost Operation Control - Fujitsu AR G30LHTBP Series Service Instructions Manual

1-18. DEFROST OPERATION CONTROL

1. CONDITION OF STARTING THE DEFROST OPERATION
The defrost operation starts as shown in the following Table 11, 12, and 13.
( Table 11 : Condition of 1st defrost operation)
1st defrost
after
starting operation
( Table 12 : Condition of 2nd defrost operation)
From 2nd and later
defrost after
starting operation
( Table 13 : Condition of Integrating defrost operation)
Integratingdefrost
(Constant monitoring)
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.
2. CONDITION OF THE DEFROST OPERATION COMPLETION
Defrost operation is released when the conditions becomes as shown in Table 14.
( Table 14 : Condition of defrost release )
Outdoor heat exchanger temp. is higher than 12°C
Compressor operation time has passed 15 minutes.
Compressor integrating operation time
Less than 22 minutes
Outdoor heat exchanger temp.
Does not operate
Compressor integrating operation time
Less than 35 minutes
Does not operate
Compressor integrating operation time
More than 240 minutes
( For long continuous operation )
Outdoor heat exchanger temp.
Below -3°C
Release Condition
or
More than 22 minutes
Below -9°C
More than 35 minutes
Outdoor heat exchanger temp.
Below -10°C
Less than 10 minutes
( For intermittent operation )
OFF count of the compressor
40 times
01-20
More than 62 minutes
Outdoor heat exchanger temp.
Below -5°C