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1
Installation
Condensate absorption point
The condensate drainage pipe should have a minimum
outside diameter of 21.5 mm and the external pipe length
should not be more than 3 m. The condensate absorption point
should be sited in a convenient position as close as possible to
the boiler but not in the vicinity of other services. See fig. 11 for
information.
NOTE
When discharging condensate to an outside
drain caution must be taken to ensure
blockage cannot occur during freezing condi-
tions. If this is likely to occur, the use of a
syphon trap is recommended.
Subject to modifications resulting from technical improvements!
14
Installation and maintenance instructions for Buderus 500 - 24/C and 500 - 28/C • 02/2005
Boiler
Ø21.5 mm min.
Sink
No length restriction
fig. 10 External termination of condensate drainage pipe via
internal discharge branch (e.g. sink waste – proprietary
fitting) and condensate syphon
External length of
pipe 3m max.
Ø21.5 mm min.
500 mm min.
Ø100 mm min.
plastic tube
bottom of
tube sealed
limestone
chippings
Two rows of three
12 mm holes at 25 mm centres
50 mm from bottom of tube and
facing away from house
fig. 11 External termination of condensate drainage pipe to
absorption point
Boulter Buderus Ltd. • http://www.boulter-buderus.co.uk
Open end of pipe
direct into gully,
below ground but
above water level
Ground
(either/or)
hole depth
400 mm min.
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