Test Of The System And Control Of The Air Volume To The Outlet Grilles - Technibel DSAVM93R5TA Series Installation Manual

4. 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. 4-1)
Disconnect the fan motor plug in the electrical box and insert
the booster cable as a cable extension between the motor plug
EG
and the socket from the PCB. The external static pressure will
increase to 7 mm w.g. Check static pressure and air flow rate
on the fan performance graph. (fig. 4-2)
Booster cable
Fan motor
H = High fan speed
L = Low fan speed
HH = Very high fan speed
M = Middle fan speed
DSAVM18X
10
8
6
4
M
L
2
0
300 500 700
Connector motor cable (at the supply)
HH
H
900 1100 1300 1500
m 3 /h
Fan motor
Fig. 4-2
10
8
6
4
2
0
200
b
H: Standard supplied unit. Available fan speeds: Low-Middle-
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
7
Fig. 4-1
Booster cable
DSAVM9X/12X
HH
H
M
L
400 600 800 1000
m 3 /h