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3. TEST OF THE SYSTEM AND CONTROL OF THE AIR VOLUME TO THE OUTLET GRILLES
The unit is prearranged to supply an external static pressure
of about 5 mm. Too high resistances in the air distribution
system can cause an exceedingly small air volume to the
outlet grilles.
This trouble can be solved by increasing the fan speed as
follows:
Open the cover of the electrical junction box. Take out the
booster cable clamped in the box. (fig. 3-1)
Disconnect the fan motor plug in the electrical box and insert
the booster cable as a cable extension between the motor
plug and the socket from the PCB. The external static pres-
sure will increase to 7 mm w.g. Check static pressure and air
flow rate on the fan performance graph. (fig. 3-2)
Booster cable
Fan motor
Connector motor cable (at the supply)
H = High fan speed
L = Low fan speed
HH = Very high fan speed
M = Middle fan speed
H:
Standard supplied unit. Available fan speeds: Low-Midd-
P
le-High (L - M - H). Max. static pressure: about 5 mm
HH: Unit with cable extension of the fan motor (booster
cable). Available fan speeds: Middle-High-Very high (M -
H - HH). Max. static pressure: about 7 mm
16/18
10
8
6
4
M
L
2
0
300
500
700
900
Fan motor
Fig. 3-2
HH
H
1100
1300
1500
3
m
/h
Fig. 3-1
Booster cable
10
8
6
4
2
0
200
10
8
6
4
2
0
300
500
7
7/9/12
HH
H
M
L
400
600
800
22
HH
H
M
L
700
900
1100
1300
1000
3
m
/h
1500
3
m
/h
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