Page 20 - IOM / ROOF-TOP FLEXY™ Series
D. If the flow and the pressure are correct:
On grills "b" and "b’", bring the pressure at 5 to
the same level as 3 (the grills must be moved
simultaneously by the same amount).
E. Check that the power absorbed by the extract
fan motor is less than its rated power.
If the values are not the same, refer to the
"AIR
FLOW BALANCING"
section.
F. Switch the unit to "fresh air" (Figure 16), and
measure the static pressure at 2/3/4/5/6.
G. Adjust grill "a" so that the value measured at 3 is
the same as the value at point B.
H. Finally check that the pressure at 5 is the same
as the pressure measured at point B. If not,
slightly adjust
the grill "b"
setting of the
fresh air by-
pass.
1
2 3 4 5
6
a
b, b'
Soufflage
Air neuf
Rejet
Air extrait
Figure 15
FX in "recycle air" position
Figure 16
FX in "fresh air" position
AIRFLOW BALANCING - FXA/FXKAIRFLOW BALANCING - FXA/FXK
AIRFLOW BALANCING - FXA/FXKAIRFLOW BALANCING - FXA/FXK
AIRFLOW BALANCING - FXA/FXK
The FX* models are designed to operate with more
complex supply and extract ductwork systems. Without
balancing there are numerous risks:
- Fan motor overvoltage
- Significant flow variations depending on the
position of the dampers, which affects the building
concerned, especially when applied to pressure
balanced systems.
To rectify this we have fitted an equilizing grill on the
fresh air dampers. The grill can be moved after
unscrewing the knurled nuts (1 - Figure 14) and
operates as an adjustable damper.
Before starting to adjust fully open the equilising grills.
To equilise, proceed as follows:
A. Set the unit to the "recycle air" position (Figure
15)
B. Measure the static pressure in the areas
indicated 1/2/3/4/5/6
C. Before proceeding further, check that the pres-
sure difference between zones 1 and 4 satisfies
the static pressure required.
If this is not the case, refer to the
"AIR FLOW
BALANCING"
section.
Example :
Zone 1 2 3 4 5 6
Technical specification 200 -180
Recycled air without setting 190 -230 -210 -190 -70 -120
Recycled air after setting b/b’ 190 -230 -210 -190 -210 -240
Fresh air before setting 270 -80 -50 -200 -220 -250
Fresh air after setting grill a 190 -230 -210 -200 -220 -250
Fresh air after setting grill b’ 190 -230 -210 -190 -210 -240
Grill b'
fresh air by pass
Figure 14
1
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