Intermittent Fan Mode; Heating / Heating Main Operation - Fujitsu Airstage VR-II Series Service Manual

Intermittent fan mode

When switched from normal fan step to intermittent fan step, always start from 300rpm/7sec.
When there was a change during intermittent step 1-6, switching is performed at the time the current speed
duration time reaches time-up.
Fan step Fan mode
6 intermittent 6
5 intermittent 5
4 intermittent 4
3 intermittent 3
2 intermittent 2
1 intermittent 1
Normal fan step
300 rpm
0 rpm

2-6-2 Heating / Heating main Operation

(1) Heating Operation
The fan speed during all heating is constant with Fan step 16* regardless of the outdoor air temperature.
( rpm )
920
880
( )
-4 F
Heating Operating range
(-20 )
(2) Heating main Operation
Operate at 500 rpm until all the heat exchangers are used up.
Then adjust the rpm up or down in accordance with the load.
Number of Evaporator
Fan Speed
(rpm)
1
880 (920)
500 (500)
300 (300)
0
( ): L-Chassis
Fan speed 0 rpm
duration time T ( sec )
40
33
26
19
12
6
Intermitten fan step
7 sec 7 sec
[ T ] sec
2 3 4 5 6
Fan speed 300 rpm
duration time ( sec )
7
7 sec
[ T ] sec
Fan step
L-Chassis
S-Chassis
16*
15
14
13
12
11
70 F
(21 )
02-09
Time
Fan speed (rpm)
S-Chassis L-Chassis
880 920
860 870
810 820
720 720
620
620
500
500