Buderus 600 - 11S Installation And Servicing Instructions page 14

1 Installation
Any internal pipework should be of a diameter to match the
requirements of the condensate exit pipe on the appliance.
A 32 mm (1¼") waste pipe solvent weld fitting can be used,
fitted externally over the condensate exit pipe on the
appliance.
All external pipework should be kept to a minimum to avoid
freezing and should have a diameter of not less than 22 mm.
Internal termination to internal stack
The condensate drainage pipe should have a minimum
diameter of 22 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 condensate seal. For all internal and external stack
connections a second trap is required to prevent any odours
emanating from the condensate air break at the boiler (see
fig. 7).
External termination via internal branch (e.g. sink waste)
The condensate drainage pipe should have a minimum
diameter of 22 mm with no length restriction and should
incorporate a trap with a 75 mm seal. 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. 8 and fig. 9).
Subject to modifications resulting from technical improvements!
14 Installation and maintenance instructions for wall-mounted condensing gas boiler 600 - 11S/19S/24S/24C • 05/2004
Boiler
Ø22 mm min.
No length restriction
75 mm min. trap
Fig. 7 Internal termination of condensate drainage pipe to
internal stack
Boiler
Sink
Ø22 mm min.
Fig. 8 External termination of condensate drainage pipe
via internal discharge branch (e.g. sink waste) and
condensate siphon
Boiler
Ø22 mm min.
Sink
No length
restriction
75 mm min. trap
Fig. 9 External termination of condensate drainage pipe
via internal discharge branch (e.g. sink waste –
proprietary fitting) and condensate siphon
Boulter Buderus Ltd. • http://www.boulter-buderus.co.uk
internal soil
and vent stack
invert
No length restriction
Open end of pipe
75 mm min. trap
direct into gully,
below ground but
above water level
Open end of pipe
direct into gully,
below ground but
above water level