Fujitsu Airstage J-II - Fan Control; Cooling Operation

Switching conditions of step
2-3 FAN CONTROL
2-3-1 Cooling Operation
Fan step
11
10
9
8
7
6
5
4
3
2
1
0
780
700
660
660
670
590
540
540
450
410
340
340
270
250
390
0
340
0
290
0
250
0
0
0
AJ A36LALH AJ A45LALH AJ A54LALH
Fan speed (rpm)
02-05
(Conditions which lower the fan speed)
High-pressure saturation low limit of target high-pressure
saturation range and heat sink temperature 75°C
(Conditions which raise the fan speed)
High-pressure saturation upper limit of target high-pressure saturation or heat sink temperature 80°C
Fan step
7
5
2
0
Outside air temperature
sensor detected value
TAOUT 30°C
30°C TAOUT 20°C
20°C TAOUT 10°C
10°C TAOUT
The initial speed of the outdoor unit is detected by out door temperature sensor.
35 52
40.4
46.6
54
High-pressure saturation temperature
Outdoor temperature
Upper limit of target
high-pressure saturation
temp.
Low limit of target
high-pressure saturation temp.
Target high-pressure
saturation temp.
Thereafter, the high-pressure is monitoring at a
set time interval and the fan speed is changed
by the following conditions.
The fan is controlled to keep high puressure saturation temperature
within the target range as follows
780
700
660
660
670
590
540
540
450
410
340
340
270
250
390
0
340
0
290
0
250
0
0
0
780
700
700
700
670
590
540
540
450
410
340
340
270
250
390
0
340
0
290
0
250
0
0
0
Step
Upper FAN
Lower FAN