Fan Control - Fujitsu AUXB04GALH Service Manual

2-3 FAN CONTROL

2-3-1 Cooling Operation
Fan step
13
12
11
10
9
8
7
6
5
4
3
2
1
0
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 speed (rpm)
AJ*072LELAH AJ*090LELAH AJ*108LELAH
-
-
- -
- -
-
-
680 780
740
680
660
660
660 660
590 590
510 510
520 520
400 400
440 440
330
330
380
380
300 300
300 300
300 300
450 450
0 0
300
300
0
0
Intermittent 1 Intermittent 1
0 0
Intermittent 2 Intermittent 2
0 0
0 0
0 0
Fan step
9
High-pressure saturation temperature
7
4
0
low limit of target high-pressure
55°C: 8&10HP
60°C: 12HP
upper limit of target high-pressure saturation or heat sink temperature
960
Step
880
870
790
790
710
Intermittent 1 : 14 sec. ON (300rpm), 17 sec. OFF
700
620
Intermittent 2 : 19 sec. ON (300rpm), 17 sec. OFF
590
510
520
400
440
330
380
300
300
300
450
0
300
0
Intermittent 1
0
Intermittent 2
0
0
0
The fan is controlled to keep high puressure saturation temperature
within the target range as follows
Upper limit of target high-pressure saturation temp.
54
47.8
46.6
40.4
30
02-04
Upper FAN
Lower FAN
Target high-pressure saturation
temp.
Low limit of target
high-pressure saturation temp.
37.4
Outdoor temperature
60°C: 8&10HP
65°C: 12HP