CONDENSATE PIPEWORK
Fitting an external air brake:
• When a rain water down pipe is used to
dispose of condensate, an air break must be
installed in the 43mm pipe work, between the
boiler condensate outlet and the drainpipe,
outside the property, to avoid flooding during
adverse weather conditions.
NOTE: Condensate drainage pipe can be run
above or below ground.
• Where the pipe terminates over an open drain
or gully, the pipe should terminate below the
grating level, but above water level, in order to
minimise “wind chill” at the open end.
• The use of a drain cover (such as those used
to prevent blockage by leaves) may offer
further protection from wind chill.
• Pipe drainage will be improved if the end is
cut at 45° as opposed to a straight cut.
CONDENSATE SOAK AWAY:
Key to diagrams:
12. 100mm Ø minimum plastic pipe
13. Drainage holes
14. Limestone chippings
15. Bottom of sealed tube
• All national and, where appropriate, local
regulations for the discharge and neutralisation
of condensate should be followed.
• The condensate drainage pipe may be run
above or below the ground to the soak away.
The examples shown on this page run above
ground.
• The soak away must use a 100mm Ø plastic
tube with two rows of three 12mm holes on
25mm centres and 50mm from the bottom of
the tube. The holes must face away from the
house.
• The tube must be surrounded by at least
100mm of limestone chippings to a depth of
400mm.
NOTE: Minimum hole size for the condensate
soak away must be 400mm deep by 300mmØ.
• In situations where there are likely to be
extremes of temperature or exposure, the use
of a proprietary trace heating system for
external pipe work, incorporating an external
frost thermostat, should be considered. If
such a system is used, the requirement to
use 32mm pipe does not apply.
However, all other guidance above and the
instructions for the trace heating system,
should be closely followed.
Making it safe:
• Condensate pipework must not leak, freeze
or block up.
• Condensate traps must be filled before starting
up the boiler to prevent potentially harmful flue
products escaping via the condensate route.
• Do not dispose of condensate into water
recovery systems.
UNSUITABLE FOR CLAY SOIL TYPES
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