Connecting The Discharge Pipe To The Expansion Relief Valve On The Boiler - Vaillant ecoTEC pro Installation And Maintenance Instructions Manual

6 Hydraulic installation
> Connect the condensate discharge (1) of the boiler to a
condensate discharge pipework (3) which has a minimum
internal diameter of 19 mm (22 mm outside diameter for
all external pipes) and is made from an acid-resistant
material (e.g. plastic overflow pipe).
The condensate drain pipework must have a
i
continuous fall (45 mm per metre) and should
whenever possible terminate at a suitable drain
point within the heated envelope of the build-
ing that will remain frost free under long peri-
ods of low external temperatures.
> During installation remove all burs from inside of cut
pipe work and avoid excessive adhesive which may trap
small pockets of water close to the pipe wall which can
freeze and build into a larger ice plug.
> As with other pipe work insulate the condensate dis-
charge pipe to minimise any risk of freezing and beware
when crossing cavities that the fall is maintained and the
pipe sleeved.
> The condensate discharge pipework must terminate in a
suitable location.
Further information can be obtained from "BS 6798 Specifi-
cation for installation of gas–fired boilers of rated input not
exceeding 70 kW net". Before starting up the boiler, the
condensate trap (2) must be filled with water, as described
in the relevant section.
6.6 Connecting the discharge pipe to the
expansion relief valve on the boiler
The expansion relief valve for the heating installation is
integrated in the boiler.
> Install the discharge pipe for the expansion relief valve
so that it does not interfere with the removal and fitting
of the condensate trap.
We recommend not to shorten the discharge
i
pipe supplied.
> Leave an installation space of at least 180 mm beneath
the condensate trap.
22
min.
1 8 0
6.4 Fit the discharge pipe on the expansion relief valve
> Insert a seal (1) in the cap nut (2).
> Screw the discharge pipe (3) onto the expansion relief
valve.
> Make the drain line routing as short as possible and slop-
ing away from the boiler.
> Allow the line to terminate in such a way that nobody
can be injured and no cable or other electrical compo-
nents can be damaged if water or steam is ejected.
> Note that the end of the line must be visible.
> If the pipe cannot fall to a safe discharge point then the
Vaillant remote pressure relief valve mounting kit can be
used to provide a suitable way to achieve this.
> Ensure the discharge pipe work is installed, routed and
terminated correctly to minimise the risk of freezing up.
Installation and maintenance instructions ecoTEC pro 0020129672_03
1
2
3