Vaillant condensate circuit information:

It is not necessary to provide air breaks or extra traps
in the discharge pipe as there is already a 75mm high
trap inside the boiler. Fitting an extra trap may cause
the boiler siphon to work incorrectly.

(b) Connecting into the internal discharge branch
(e.g. sink waste or washing machine) with an external
termination, the condensate drain pipe should have a
minimum diameter of 22mm with no length restriction
and should incorporate a trap with a 75mm (3)
seal. The connection should preferably made down
stream of the sink waste trap, if the connection is
only possible up stream, then an air break is needed
between the two traps. This is normally provided by
the sink waste.

Don't those two contradict each other?


NT