Pre-Installation
Worcester Commercial Boiler Series – 6720814332 (2019/04)
16
Fig. 16 Disposal into a rainwater down pipe
[1]
Condensate discharge from boiler
[8]
PVCu strap on fitting
[14] Pipe work transition
[15] External air break
[16] Air gap
[17] External rain water pipe into foul water
[18] 43mm 90° male/female bend
[*]
Condensate trap of 75mm already incorporated into the boiler
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.
Fig. 17 External disposal
[1]
Condensate discharge from boiler
[13] Insulate and increase pipe size
[14] Pipe work transition
[*]
Condensate trap of 75mm already incorporated into the boiler
Condensate soak away
• 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.
Minimum hole size for the condensate soak away must be 400mm deep
by 300mm Ø .
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.
NOTICE:
Unheated internal areas.
▶ Internal pipe runs in unheated areas such as lofts, basements and
garages should be treated as external runs.
Fig. 18 Soak away
[1]
Condensate discharge from boiler
[9]
100mm Ø minimum plastic pipe
[10] Drainage holes
[11] Limestone chippings
[12] Bottom of sealed tube
[13] Insulate and increase pipe size
[14] Pipe work transition
[*]
Condensate trap of 75mm already incorporated into the boiler
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