Fujitsu AOU12RLS2 User Manual

21. DEFROST OPERATION CONTROL
01-16
1. CONDITION OF STARTING THE DEFROST OPERATION
The defrost operation starts when the outdoor heat exchanger temperature sensor (Tn) detects
the temperature lower than the values shown in Table 18.
2. CONDITION OF THE DEFROST OPERATION COMPLETION
Release Condition
Outdoor heat exchanger temperature sensor value is higher than +16°C or
Compressor operation time has passed 15 minutes.
(Table 18 : Condition of starting Defrost Operation)
Defrost operation is released when the conditions become as shown in Table 19.
(Table 19 : Defrost Release Condition)
Integrating defrost
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.
Normal defrost
Compressor integrating operation time
Less than 35 minutes More than 35 minutes
Does not operate
Tn < -17°C (at outside air temp. > -10°C)
Tn -Tn10 < -5deg
Tn -Tnb < -2deg
However, Tn < -6°C
Tn < Outside air temp.- 7°C
or Tn < - 20°C
(at -20°C < outside air temp. < -10°C)
More than 240 minutes
(For continuous operation)
Less than 10 minutes
( For intermittent operation )
Compressor integrating operation time
Outdoor heat exchanger
temperature below -3°C
More than 213 minutes
(For continuous operation)
Outdoor heat exchanger
temperature below -5°C
OFF count of the compressor
40 times
=
=
=
=
=
=
Tn < Outside air temp.- 7°C
or Tn < - 30°C
(at outside air temp. < -20°C)
=
=
Tn10 : Temperature of continuous operation at 10 minutes.
Tnb : Back 5 minutes temperature

Fujitsu AOU12RLS2 Specifications

General

Brand	Fujitsu
Model	AOU12RLS2
Category	Air Conditioner
Language	English