Condensate drain

A condensate drain is necessary for ventilation units without an ET enthalpy heat exchanger. No condensate drain is needed in units with an ET enthalpy heat exchanger.

Ventilation units with a condensate drain (B=Bypass, K=PTC heat register)

Unit types
left-hand version

Unit types
right-hand version
(mirror-inverted structure)

WR 310 / WR 410

WR 310 R / WR 410 R

WS 320 B / WS 470 B

WS 320 BR / WS 470 BR

WS 320 K / WS 470 K

WS 320 KR / WS 470 KR

WS 320 KB / WS 470 KB

WS 320 KBR / WS 470 KBR

Installing the condensate drain

Without a siphon, the ventilation unit will draw in infiltration air through the drain pipe.

Be sure to install a siphon. Never install several siphons one after another without a pipe separator.

Germ build-up possible if siphon is without drip funnel, as there is no decoupling from the wastewater system.

Siphon needs water seal head of at least 50 mm. Install an open drip funnel with another siphon at the drain system side.

Fig. Left-hand version of the ventilation unit (the right-hand version is mirror-inverted)

  1. Remove the sealing plug (rubber) from the bottom of the unit (inside) at the condensate drain outlet.
  2. Fit a siphon and open drip funnel to the condensate drain.
  3. If the humidity level in the installation room is disproportionately high, insulate the drain and condensate discharge outlet to avoid condensate.
  4. Fill drain with water, check seal integrity and drainage. Fill the siphon up with water after long dry periods too.
  5. Fit a siphon with a drip funnel and a water seal head of at least 50 mm.
  6. Insert internal cover into the bottom housing rail, close it and secure it with 4 screws (bayonet lock).
  7. Fit front panel in the two lugs and close (magnets).