Defrost Operation Control - Fujitsu AU*24LUAR Service Instruction

5-17. DEFROST OPERATION CONTROL

1. CONDITION OF STARTING THE DEFROST OPERATION
1-1. For AU*24LUAR
The defrost operation starts when the outdoor heat exchanger temperature sensor detects
the temperature lower than the values shown in Table 9-1.
(Table 9-1 : Condition of starting Defrost Operation)
AU*24LUAR
1-2. For AU*30/ 36/ 45/ 54LUAS
The defrost operation starts when the outdoor heat exchanger temperature sensor detects
the temperature lower than the values shown in Table 9-2.
(Table 9-2 : Condition of starting Defrost Operation)
AU*30LUAS
AU*36LUAS
AU*45LUAS
AU*54LUAS
2. CONDITION OF THE DEFROST OPERATION COMPLETION
2-1. For AU*24LUAR
Defrost operation is released when the conditions become as shown in Table 10-1.
(Table 10-1 : Defrost Release Condition)
AU*24LUAR
2-2. For AU*30/ 36/ 45/ 54LUAS
Defrost operation is released when the conditions become as shown in Table 10-2.
(Table 10-2 : Defrost Release Condition)
AU*30LUAS
AU*36LUAS
AU*45LUAS
AU*54LUAS
Compressor integrating
operation :Less than 40min.
Does not operate
*1. It means contiguous operation time.
*2. Compressor stop time: Below 20min.
Compressor integrating
operation :Less than 45min.
Does not operate
Does not operate
*1. It means contiguous operation time.
*2. Compressor stop time: Below 20min.
Outdoor heat exchanger temperature sensor value is higher than 10°C or
Compressor operation time has passed 15 minutes.
Outdoor heat exchanger temperature sensor value is higher than 12°C or
Compressor operation time has passed 15 minutes.
Compressor integrating
operation :40min and over
Less than 6 min. *1 After 6 min. *1
or 10min. *2 or 10min. *2
-8
Above 20min.
Compressor integrating
operation :45min and over
Less than 6 min. *1 After 6 min. *1
or 10min. *2
or 10min. *2
°
-8
°
-10
°
-8
°
-10
Above 20min.
Release Condition
Release Condition
05-15
°
C
Select 6min.
Select 10min.
Outdoor temp. -
Outdoor heat exchanger
temp.
C *3
C *4
C *3
deg
12 C
C *4
*3. Outdoor temp. > -1°C
*4. Outdoor temp. < -1°C
Select 6min.
Select 10min.
Outdoor heat
exchanger temp.
°
-20 C
=