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Installation
Material for condensate
NOTE
Ensure that the condensate trap is filled with
water.
The condensate drainage pipe should be run in a standard
drain pipe material, e.g. PVC (polyvinyl chloride), PVC-U
(unplasticized polyvinyl chloride), BS (acrylonitrile-butadienes-
tyrene), PP (polypropylene polyprolene) or PVC-C (cross-
linked polyvinyl chloride).
The condensate drain can be attached to the syphon (fig. 7).
Any internal pipework should be of a diameter to match the
requirements of the condensate exit pipe on the appliance.
Internal termination to internal stack
The condensate drainage pipe should have a minimum
outside diameter of 21.5 mm with no length restriction. It
should incorporate a trap with a 75 mm condensate seal and
be connected to the stack at a point at least 450 mm above the
invert of the stack. The trap built into the boiler will provide
this 75 mm (fig. 8) condensate seal.
External termination via internal branch (e.g. sink waste)
The condensate drainage pipe should have a minimum
outside diameter of 21.5 mm with no length restriction. The
connection should preferably be made downstream of the sink
waste trap. If the connection is only possible upstream, then
the air break is needed between the two traps. This is normally
provided by the sink waste pipe (see fig. 9 and fig. 10).
Subject to modifications resulting from technical improvements!
Installation and maintenance instructions for Buderus 500 - 24/C and 500 - 28/C • 02/2005
fig. 7
Condensate outlet
Boiler
Ø21.5 mm min.
No length restriction
fig. 8
Internal termination of condensate drainage pipe to
internal stack
Boiler
Sink
Ø21.5 mm min.
fig. 9
External termination of condensate drainage pipe via
internal discharge branch (e.g. sink waste) and
condensate syphon
Boulter Buderus Ltd. • http://www.boulter-buderus.co.uk
internal soil
and vent stack
invert
No length restriction
Open end of pipe
direct into gully,
below ground but
above water level
1
13
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