Technical data

21
Boiler installation sequence 4
Instructions for installation and servicing ecoMAX 21
4.13 Condensate drain (fig. 4.10)
Connect the boiler condensate drain (1) to the condensa-
te discharge pipe (2) the condensate discharge pipe
should be minimum of 19mm internal diameter (22mm
external diameter for any pipework installed external to
the property) and be made of an acid resistant material
(e.g. plastic overflow pipe).
The discharge pipe from the boiler condensate drain
must have a continuous fall (45mm per metre) and pre-
ferably be installed and terminated within the building to
prevent freezing. The condensate discharge pipe must
terminate in a suitable position, e.g.:
a)preferably the discharge pipe should be run and termi-
nate internally to the house soil and vent stack (at
least 450mm above the invert of the stack). A trap
giving a water seal of at least 75mm (3) should be
incorporated into the pipe run, and there must be an
air break (4) in the discharge pipe upstream of the
trap. This should be designed so that the condensate
cannot be discharged into the house if the condensate
pipe becomes blocked.
b)connecting into the internal discharge branch (e.g. sink
waste or washing machine) with an external terminati-
on, the condensate discharge pipe should have a mini-
mum diameter of 22mm with no length restriction and
should incorporate a trap with a 75mm (3) seal The
connection should preferably be made down stream of
the sink waste trap. If the connection is only possible
upstream, then a air break is needed between the two
traps. This is normally provided by the sink waste. c)
terminating in a gully (5) below grid level (6) and
above the water level. The external pipe length should
be kept a short as possible to minimize the risk of fre-
ezing and should not be more than 3m.
d)At a condensate absorption point (soakaway) (7). The
external pipe length should not be more than 3m
Fig. 4.10
Fig. 4.11
Note:
If it is necessary to install any condensate
discharge pipework externally, then it should be
kept as short as possible to a maximum length
of 3m, be insulated with waterproof insulation
and have a continuous fall of a least 2.50 (i.e.
45mm for every metre length).
An optional siphon condensate discharge accessory is
available (Art. No. 2370104) and is for use where exter-
nal discharge pipework is very exposed and at risk of
freezing. This accessory is for installation within the con-
densate discharge pipework immediately below the boiler.
Refer to ‘BS 6798 Specification for installation of
gas–fired boilers of rated input not exceeding 70 kW net’
for further information. Before operating the boiler the
condensate trap (1, fig.4.11) must be filled with water as
described in relevant section.
4.14 Connection to a VANTAGE cylinder (ecoMAX 600)
• For connecting a Vaillant VANTAGE cylinder please
refer to the VANTAGE installation instructions provi-
ded with the cylinder.
4.15 Connect the flue system to the boiler
• Refer to separate air/flue duct installation instructions
included with the boiler.
1
Internal
stackpipe
Internal
discharge system
Gulley Soakaway
ab c d
1
2
3
5
6
3
7
4
83 41 77_12 GB04.04.qxd 22.09.2004 12:34 Uhr Seite 21