nilan VPM 1000, Installation And Service Instructions Manual, Page: 30 / 44

Plumbing installation
Condensate drain
Important information
The unit is supplied with an Ø32 mm condensate drain (PVC, GF-fittings). The condensate drain is located on
the front of the unit on the return side of the center module, and is marked with a yellow label.
There must must be installed in connection with the condensate drain to ensure that condensate water
can drain away. The slope must be 1,5 cm per 1 m pipe from the water trap to the drain.
If you install the unit outside the climate screen, it is important to add a heating cable to prevent the
condensate drain from icing up. Frost protection of the unit is the installer's responsibility.
During operation negative pressure of up to 1000 Pa may occur in the drain, corresponding to a 100
mm water column. The water trap must therefore be installed as illustrated to prevent it from drying out
and to avoid return flow.
The connection of the water trap must be air-tight; otherwise air will be drawn into the unit, and
condensate water will remain in the unit. It could cause water damage if the condensate tray overflows
and condensate water runs out of the unit.
The water trap may dry out which would prevent water from draining from the condensate tray, as air
would blow into the unit. The water trap should therefore be checked regularly, especially at the end of
the summer, and it should be topped up with water if necessary. Increasing the height of the water trap
beyond the minimum requirements will minimise the need for topping up.
Nilan can supply a water trap with a ball. The ball ensures that no air is drawn into the unit through the
condensate drain if the water trap dries out. This means that water in the condensate tray can drain
away, which makes it unnecessary to check the condensate drain quite as often.
After installing the water trap, you should test it as follows (the unit must be connected to the duct system and
the door must be closed):
Fill the condensate tray with water and start the unit at the highest fan speed level. Allow it to run for several
minutes. When the test is complete, make sure there is no water in the condensation tray.
Connecting condensate drain
Ø32 mm
min. 50 mm
min. 50 mm
min. 120 mm
Ø32 mm
Connection of standard water trap Connection of Nilan’s water trap with ball (is
recommended)
30