Technical data

Hydraulic installation
Installation and maintenance instructions ecoTEC plus 0020116700_06 23
6
6.5 Low loss header
A low loss header disconnects the boiler from the heating
system. The system is no longer dependent on the remain-
ing feed head of the boiler. In conjunction with the boiler
circulation pump, the low loss header ensures that a suffi-
ciently high minimum quantity of water is always circulating
through the boiler. No electrical accessories are required in
order to use a low loss header.
6.6 Connecting the condensate discharge
pipework
a
Danger!
Risk of death from flue gases!
Due to an empty or insufficiently filled con-
densate trap, flue gases may escape into
the room air.
> Make sure that the condensate water
siphon is filled with water when switching
on the boiler.
The ecoTEC plus boilers are equipped with a condensate
siphon. (The filling height is 145mm). The siphon collects
the condensate that has formed in a vessel with a capacity
of approx. 200 ml, and intermittently deposits the contents
to the discharge pipe. This minimises the risk of the dis-
charge pipe freezing up.
7
d
Soakaway
c
6
5
Gulley
a
Internal
stackpipe
3
4
3
b
Internal
discharge system
11
2
3
6.4 Condensate discharge pipework
> 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).
i
The condensate discharge pipework must have a
continuous fall (45mm per metre) and should
whenever possible terminate at a suitable dis-
charge point within the heated envelope of the
building that will remain frost free under long
periods 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". The condensate siphon (2) must be
filled with water as described in the relevant section before
the boiler is commissioned.
6.7 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.
i
We recommend not to shorten the discharge
pipe supplied.
> Leave an installation space of at least 180mm beneath
the condensate siphon.
min.
180
1
2
3
6.5 Fitting the discharge pipe to the expansion relief valve
(example: VUW boiler)