GB.SILVERSK.170901
We reserve the right to alter specifications.
14 www.swegon.com
3.3.2. Ensure correct direction of air
leakage
The commissioning plates fitted in the extract air inlet are
used for adjusting the pressure balance in the unit. The
commissioning plates are supplied separately and should
be installed by the fitter when the extract air duct is con-
nected. See the illustrations on the following pages.
Connect a pressure gauge to the pressure measurement
tappings of the air handling unit. The unit has four pres-
sure measurement tappings. The two tappings closest
to the extract air duct should be used. The blue pressure
measurement tapping is used for measuring the negative
pressure in the extract air section and the white pressure
measurement tapping is used for measuring the negative
pressure in the supply air section.
The pressure measurement tappings are located in the
centre section inside the air handling unit. See illustration
to the right.
Note that both pressure measurement tappings are used
for measuring negative pressure.
MEASURED VALUES
The negative pressure in the extract air section should be
higher or the same as the negative pressure in the supply
air section.
If the negative pressure in the extract air section is the
same or up to 20 Pa greater than the negative pressure in
the supply air section, when you’ve finished this adjust-
ment.
Deviations
If the negative pressure in the extract air section is less
than that in the supply air section, the damper setting
must be adjusted as follows:
1. Stop the air handling unit, open the inspection door to
access the extract air filter.
SILVER C RX Top/SILVER C RX with air intake from
above: Blank off the appropriate number of holes in the
commissioning plate using the plastic plugs supplied.
SILVER C RX with air intake from the side: Slightly push
the commissioning plates forward (close them) in the
extract air intake.
For full face connection (duct accessory in insulated
casing): If the commissioning plate(s) is/are completely
closed and the sub-atmospheric pressure in the extract
air section is still less than in the supply air section,
blank off an appropriate number of holes in the com-
missioning plate using the plastic plugs supplied.
3. Close the inspection door and restart the unit.
4. Measure the pressures.
Repeat this procedure until the negative pressure in the
extract air section is just as high or up to 20 Pa higher
than the negative pressure in the supply air section
(0–20 Pa).
Pressure measurement tappings – leakage direction
(Unit shown in the right-hand version)
- (blue)
+ (white)
SILVER C 04-08
SILVER C 11-80
– (blue)
+ (white)
EXTRACT AIR
EXTRACT
AIR
SILVER C 100/120
– (blue)
+ (white)
EXTRACT
AIR
5. If the negative pressure in the extract air section is
higher than 20 Pa compared with the supply air sec-
tion, although the commissioning plates are completely
open, the leakage and purging air flow will be more
than necessary, and this will cause the extract air fan to
consume more power
