Filter
Top Products
7
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)
Fan motor
Fan motor
Booster cable
Booster cable
Connector motor cable (at the supply)
Fig. 3-1
Fig. 3-2
0
2
4
6
8
10
200 400 600 800 1000
H
HH
M
L
0
2
4
6
8
10
300 500 700 900 1100 1300 1500
L
M
H
HH
7/9/12
16/18/22
m
3
/h
m
3
/h
EXTERNAL STATIC PRESSURE (mmW.G.)
EXTERNAL STATIC PRESSURE (mmW.G.)
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-
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
b