Fan Control; Cooling / Cooling Main Operation - Fujitsu Airstage VR-II Series Service Manual

2-6 FAN CONTROL

2-6-1 Cooling / Cooling Main Operation

The outdoor fan speed at start up is 300 rpm
Fan step
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
<< Ex. Cooling operaion >>
The fan speed is controlled to keep high pressure saturation temperature within the target range as follows
The high-pressure is monitoring at a set time interval and the fan speed is changed by the following conditions.
(Conditions which raise the fan speed)
High-pressure saturation
(Conditions which lower the fan speed)
High-pressure saturation
High-pressure saturation temp.
129 F
(54.0
116 F
(46.6
107 F
(40.4
Fan speed (rpm)
S-Chassis
880
860
810
720
620
500
420
360
320
300
intermittent 6
intermittent 5
intermittent 4
intermittent 3
intermittent 2
intermittent 1
0
upper limit of target high-pressure saturation or heat sink temperature
low limit of target high-pressure saturation range and heat sink temperature
)
Upper limit of target high-pressure
saturation temp.
)
Target high-pressure
saturation temp.
)
Low limit of target high-pressure saturation temp.
95 F
(35.0 )
L-Chassis
920
870
820
720
620
500
420
360
320
300
intermittent 6
intermittent 5
intermittent 4
intermittent 3
intermittent 2
intermittent 1
0
126 F
(52.0 )
02-08
Outdoor temperature
176°F(80°C)
167°F(75°C)