30
Plumbing installation
Condensate drain
Important information
Connection of water trap
Important information
The unit comes with an Ø32 mm condensate drain (PVC, GF-fi ttings). The condensate drain is located on the side of the unit under
the discharge duct connection. It is marked with a yellow label.
ATTENTION
You must install a water trap in connection with the condensate drain to ensure that condensate water can drain
away. There must be a slope of min. 1 cm per meter from the water trap to the drain.
ATTENTION
If you install the ventilation unit outside the climate screen, it is important to prevent the condensate drain from
freezing up. You can do this by using a heating cable. Frost protection of the unit is the installer’s responsibility.
ATTENTION
During operation, negative pressure of up to 1,000 Pa may occur in the unit, corresponding to a 100 mm water
column. The water trap must therefore be installed as shown below to prevent return fl ow.
The connection of the water trap must be airtight. Otherwise air will be drawn into the ventilation unit and it will prevent conden-
sate water from draining away. It could cause water damage if the condensate tray were to overfl ow and condensate water were
to leak from the ventilation unit.
If a water trap dries out, air will be drawn into the ventilation unit and this will prevent condensate water from draining away. You
should therefore check the water trap regularly and top up with water when necessary, especially in the autumn and in the spring
when less condensate water is formed. Increasing the height of the water trap beyond the minimum requirements will minimise
the need for topping up.
USEFUL INFORMATION
As an accessory, Nilan A/S can supply a water trap with ball. When the water trap dries out, the ball closes it up
and ensures that air cannot be drawn into the ventilation unit. When condensate water is formed again, it will lift
the ball, and the water will be able to drain away without problems.
After you have installed the water trap, test its function in the following way (the unit must be connected to the duct system):
Fill the condensate tray with water, close the unit door and start the ventilation unit at the highest fan speed level. Allow it to run
for several minutes. Open the door and check that the water has drained from the condensate tray.
Ø32 mm
min. 50 mm
min. 50 mm
min. 120 mm
Connection of a standard water trap Connection of Nilan’s water trap with ball
(recommended)
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