Fan Control; Cooling Operation - Fujitsu Airstage J-II Service Manual

2-3 FAN CONTROL

2-3-1 Cooling Operation

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