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| Instructions for unloading on the site as well as installation and connection
This type of water trap for sections with negative pres-
sure and a ball that is sucked down into its seat for block-
age of air flow into the section is available from
Systemair. The above-mentioned heights — H1 and H2 —
also apply to this type of water trap. The great advantage
of this type of water trap for sections with negative pres-
sure is that this type does not require water at the bottom
to close for air flow backwards into the section. Conden-
sate water will escape through this type of water trap —
even after long periods without any water to close for air
flow backwards through the trap.
This water trap is optional and must be ordered sepa-
rately. Installation of water trap is not included.
The water trap in this picture has the delivered standard
length of H1 of 150 mm and with the adjustable length of
H2 adjusted to 55 mm, this set-up allows water to flow
out at a negative pressure of 750 Pa, because the closing
level that is H1 minus H2 is 95 mm and with 75 mm cor-
responding to the negative pressure lifting the water 75
mm and an excess height of 20 mm that enables the
water to lift the ball and to flow out through the water
trap into the sewage system..
H1 must be shortened on the site by the installer —
sometimes to only 100 mm — because the height of the
low version of the base frame is only 118 mm. The ad-
justable length of H2 must be reduced to the minimum of
40 mm. According to the values in the above table, this
allows Water to flow out at a negative pressure up to 500
Pa because the closing level that is H1 minus H2 is 60
mm with 50 mm corresponding to the negative pressure
lifting the water 50 mm and an excess height of 10 mm
that enables the water to lift the ball and to flow out
through the water trap into the sewage system.
To avoid freeze ups and frost bursts of water trap and
pipes, sufficient insulation is recommended and installa-
tion of heating between the insulation and water trap/
pipes could even be necessary (insulation, heating and
controller for the heating are not delivered by Systemair).
The insulation must be easy to remove above the cap, be-
cause the ball and the seat for the ball must be cleaned
regularly to allow the ball to close air-tight to the seat.
I.4.7 Draining condensate water from cooling battery —
If the cooling battery and the drip tray are placed in the unit where negative pressure (underpressure) occurs, the clos-
ing level of the water trap must be estimated correctly. See the above-mentioned information in I.4.6 Draining conden-
sate water from heat exchanger. If the cooling battery and the drip tray are placed in the unit where positive pressure
(overpressure) occurs, the closing level of the water trap must be estimated correctly as shown on the illustration be-
low. A water trap is optional and installation of the water trap is not included.
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