GB.GOLDSK509.091101
We reserve the right to alter specifications without notice.
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3.3.2 To Ensure the Correct Leakage Direction
The adjustment plates fitted in the extract air inlet are
used for adjusting the pressure balance in the unit. The
adjustment plates are supplied separately and should be
fitted in the unit by the fitter when he connects the extract
air ducting to the air handling unit. See the illustrations on
the previous page.
Connect a pressure gauge to the pressure measurement
tappings of the unit.
The unit has four pressure measurement tappings; the two
closest to the extract air duct should be used. The blue
pressure measurement tapping measures the negative
pressure in the extract air section and the white pressure
measurement tapping measures the negative pressure in
the supply air section.
On the size 04-08 units, the pressure measurement tap-
pings are by the junction hood and on the size 12-80 units
they are inside in the centre section of the unit.
See illustration to the right.
Note that both pressure measurement tappings measure
negative pressure.
MEASURED VALUES
The negative pressure in the extract air section should be
greater or the same as the one in the supply air section.
If the negative pressure in the extract air section is the
same or up to 20 Pa more than the negative pressure in
the supply air section, then 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 adjustment plates
must be readjusted as follows:
1. Stop the unit, open the inspection door to the extract
air filter.
GOLD RX Top: blank off a number of holes in the flow
adjustment plate with the plastic plugs supplied with the
unit.
Other models: slightly push the flow adjustment plates
forward (close them) in the extract air intake opening.
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
a number of holes in the commissioning plate with the
plastic plugs supplied.
3. Close the inspection door and restart the unit.
4. Measure the pressures.
Repeat until the negative pressure in the extract air section
is the same or up to 20 Pa higher than the negative pres-
sure in the supply air section (0–20 Pa).
Pressure measurement nipples -
leakage direction
(Unit in right-hand version)
- (blue)
+ (white)
GOLD 04-08
GOLD 12-80
– (blue)
+ (white)
EXTRACT AIR
EXTRACT
AIR
5. If the negative pressure in the extract air section is
higher than 20 Pa compared to the supply air section,
although the adjustment plates are completely open, the
leakage and purging air flow will be more than anticipat-
ed. This means that the actual extract air flow will deviate
from the preset extract airflow. The deviation increases
with increased pressure differential.
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