Flue Pipe; Condensate Discharge - Vaillant ecoMAX 646 Installation And Maintenance Manual

4 Installation
flue adequately
supported
Fig. 4.9

4.6.2 Flue pipe

Danger!
Only Vaillant original 80/125mm concentric
flue pipes maybe used when installed in a room
sealed application (type C) since these are au-
thorized together with the boiler. Malfunctions
can occur if you use other accessories. These
may result in damage and injury.
Fig. 4.10 Example of installation with horizontal air/flue duct
For detailed design guidance of the flue system please
refer to the flue installation manual.
4.7

Condensate discharge

4
a b
3 3
Internal Internal
stackpipe discharge system
Fig. 4.11
14
balcony/eaves
gutter
flue extended to
clear any overhang
c d
6
7
5
Gulley Soakaway
The condensate generated during combustion is led
from the condensate discharge pipe to the waste water
connection via a draining funnel.
Note!
The discharge pipe from the boiler condensate
drain must have a continuous fall (45 mm per
meter) and preferably be installed and termi-
nated within the building to prevent possible
freezing.
The condensate discharge pipe must terminate in a suit-
able position, e.g.:
a) preferably the discharge pipe should run and termi-
nate 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) with an external termination, the conden-
sate discharge pipe should have a minimum diameter
of 22 mm with no length restriction and should incor-
porate 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.
Fig. 4.12 Condensate discharge
Installation and maintenance manual ecoMAX 646 / 0020020158_02
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