Fujitsu ASU24RLF Service Instruction

21. DEFROST OPERATION CONTROL
01-26
2. CONDITION OF THE DEFROST OPERATION COMPLETION
Defrost operation is released when the conditions become as shown in Table 18-1, 18-2.
(Table 18-1 : Defrost release condition)
Release Condition
Outdoor heat exchanger temperature sensor value is higher than 50.0°F(10°C) or
Compressor operation time has passed 15 minutes.
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 17-1, 17-2, 17-3.
(Table 17-1 : Condition of starting defrost operation)
Less than 6 min. *1
or 10min. *2
*2. Compressor stop time:
Below 20min. Select 6min.
Above 20min. Select 10min.
After 6 min. *1
or 10min. *2
Compressor integrating
operation :Less than 45min.
Compressor integrating
operation :45min and over
17.6°F(-8°C) *3
10.3°F(-12°C) *4
6.8°F(-14°C) *5
3.2°F(-16°C) *6
Does not operate
*1. It means contiguous operation time.
1-1 NORMAL DEFROST
(Table 18-2 : Defrost release condition)
Release Condition
Outdoor heat exchanger temperature sensor value is higher than 53.3°F(12°C) or
Compressor operation time has passed 15 minutes.
(Table 17-2 : Condition of starting defrost operation)
Less than 6 min. *1
or 10min. *2
*3. Outdoor temp. > 30.2°F(-1°C)
*4. Outdoor temp. < 30.2°F(-1°C)
*2. Compressor stop time:
Below 20min. Select 6min.
Above 20min. Select 10min.
After 6 min. *1
or 10min. *2
Compressor integrating
operation :Less than 45min.
Compressor integrating
operation :45min and over
14.0°F(-10°C) *3
10.4°F(-12°C) *4
Does not operate
=
*1. It means contiguous operation time.
*3. Outdoor temp. > 37.4°F(3°C)
*4. Outdoor temp. > 30.2°F(-1°C)
*5. Outdoor temp. > 23.0°F(-5°C)
*6. Outdoor temp. < 23.0°F(-5°C)
Normal defrost
Normal defrost
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.
More than 210 minutes
(For continuous operation)
Less than 10 minutes
( For intermittent operation )
Compressor integrating operation time
When the compressor is
stopped, If detected
outside air temp. at 35.6°F(2°C)
OFF count of the compressor
40 times
( at outside air temp. < 35.6°F(2°C)
1-2. INTEGRATING DEFROST
(Table 17-3 : Condition of starting defrost operation)
For AOU18 / 24RLXFZ
For AOU36RLXFZ
For AOU18 / 24 / 36RLXFZ
For AOU18 / 24RLXFZ
For AOU36RLXFZ
=

Fujitsu ASU24RLF Specifications

General

Brand	Fujitsu
Model	ASU24RLF
Category	Air Conditioner
Language	English