Condensate Drain Pipe - Vaillant ecoTEC SERIES Instructions For Installation And Servicing

Note
Flush all foreign matter from the mains supply
before connecting to the boiler.
• Insert the seal (1) and connect the service valve (2) to
the appliance cold water connection.
• Fit the union nut (4) and the compression olive (3) to
the pre-formed tail provided with ecoTEC plus
appliances (5). The diameter of the pipe is 15 mm.
• Fully insert the pre-formed tail into the service valve.
Tighten the union nuts.
• Insert the seal (7) and connect in the pipe (6) to the
appliance hot water connection. The diameter of the
pipe is 15 mm.
• Mount the handle for the filling loop with a counter-
sunk screw to the service valve (2).
4.11

Condensate drain pipe

The ecoTEC plus appliances are fitted with a siphonic
trap (The filling height is 145 mm). The siphon collects
the accumulated condensate in a container of approx.
200 ml capacity and directs the entire content into the
drain pipe. The risk of the condensate drain pipe
freezing is thus minimised.
The ecoTEC pro appliances are equipped with a normal
condensing water trap where the condensate is
constantly emptied into the drain pipe.
• Connect the boiler condensate drain (1) to a
condensate discharge pipe (2) which should be
minimum of 19 mm internal diameter (22 mm external
diameter for any pipework installed external to the
property) and be made of an acid resistant material
(e.g. plastic overflow pipe).
Note
If a boiler does not include a siphon then any
external condensate drainage pipe shall be
increased to a minimum diameter of 32 mm
nominal diameter to reduce the risk of freezing.
In exposed locations, the condensate drainage
pipework shall be protected with waterproof
pipe insulation. Additionally when a boiler is
installed in an unheated location such as a
garage all condensate drainage pipes should be
considered as external.
Note
The discharge pipe from the boiler condensate
drain must have a continuous fall (45 mm per
meter) and preferably be installed and
terminated within the building to prevent
possible freezing.
Instructions for installation and servicing ecoTEC 839592_12
Boiler installation sequence 4
4
a b
3 3
Internal Internal
stackpipe discharge system
Fig. 4.8 Installing the condensate drain pipe (picture shows
ecoTEC plus combination boiler)
The condensate discharge pipe must terminate in a
suitable position, e.g.:
a) preferably the discharge pipe should run and
terminate internally to the house soil and vent stack
(at least 450 mm above the invert of the stack). A trap
giving a water seal of at least 75 mm (3) (built into the
boiler) should be incorporated into the pipe run, and
there must be an air break (4) in the discharge pipe
upstream of the trap. The connection to the stack
should not be made in a way that could cause cross
flow into any other branch pipe, or from that branch
pipe into the condensate drainpipe. This can be
achieved by maintaining an offset between branch
pipes of at least 110 mm on a 100 mm diameter stack
and 250 mm on a 150 mm diameter stack.
b)connecting into the internal discharge branch
(e.g. sink waste or washing machine) with an external
termination, the condensate discharge pipe should
have a minimum diameter of 22 mm with no length
restriction and should incorporate a trap with a 75 mm
(3) (built into the boiler) seal. The connection should
preferably be made down stream of the sink waste
trap. If the connection is only possible upstream, then
an 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 as short as possible to minimise the risk of
freezing and should not be more than 3 m.
d)at a condensate absorption point (soakaway) (7). The
external pipe length should not be more than 3 m.
Refer to 'BS 6798 Specification for installation of
gasfired boilers of rated input not exceeding 70 kW net'
for further information. Before operating the boiler the
condensate trap (1) must be filled with water as
described in relevant section.
1
2
c d
6
5 7
Gulley Soakaway
23