Fujitsu ASU30RLE Service Instruction

1-30. DEFROST OPEARTION CONTROL
1. CONDITION OF STARTING THE DEFROST OPERATION
Integrating defrost
( OFF count defrost )
2. CONDITION OF THE DEFROST OPERATION COMPLETION
Defrost operation is released when the conditions becomes as shown in Table 27.
( Table 27 : Condition of defrost release )
Release Condition
Outdoor heat exchanger temperature is higher than 55.4°F(13°C)
or
Compressor operation time has passed 15 minutes.
The defrost operation starts as shown in the following Table 23, 24, 25 and 26.
From 2nd and later
defrost after
starting operation
Less than 35 minutes More than 35 minutes
Does not operate
Compressor integrating operation time
( Table 23 : Condition of 1st defrost operation )
1st defrost
after
starting operation
Compressor integrating operation time
Less than 17 minutes More than 17 minutes More than 57 minutes
Does not operate
Compressor integrating operation time
( Table 26 : Condition of Integrating ( OFF count ) defrost operation )
( Table 24 : Condition of 2nd defrost operation )
Compressor integrating operation time
Tn < -77°F (-25°C)
Tn - Tn10 < -41°F (5°C) ( Tn < -42.8°F (6°C))
Tn - Tnb < -35.6°F (2°C) ( Tn < -42.8°F (6°C))
=
=
=
Tn10 : Temperature of continuous operation at 10 minutes.
Tnb : Back 5 minutes temperature.
Tn : Outdoor heat exchanger temperature.
Ta : Outdoor temperature.
More than 210 minutes
( For long continuous operation )
Integrating defrost
More than 210 minutes
( For long continuous operation )
(and after 30 minutes, if the 26.6°F (-3°C)) (and after 5 minutes, if the 23°F (-5°C))
(and after 5 minutes, if the 23°F (-5°C))
( Table 25 : Condition of Integrating defrost operation )
Compressor integrating operation time
Less than 10 minutes
( For intermittent operation )
OFF count of the compressor : 40 times
①
②
③
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.
(and after 5 minutes, in the 41°F(5°C))
Ta - Tn > 41°F(5°C)
and
=
Tn < 15.8°F(-9°C)
=
Tn < 26.6°F(-3°C)
=
Tn < 23°F(-5°C)
=
Tn < 23°F(-5°C)
=
01-21

Fujitsu ASU30RLE Specifications

General

Brand	Fujitsu
Model	ASU30RLE
Category	Air Conditioner
Language	English