Condensate Pipework External Connection - Worcester GREENSTAR HEATSLAVE 12/18 Instruction Manual

INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR HEATSLAVE 12/18-18/25-25/32
6 720 802 432 issue A 04/2012
CONDENSATE PIPEWORK
EXTERNAL CONNECTION
Key to diagrams continued:
9. Pipe work transition
10. Insulate and increase pipe size
11. External rain water pipe into foul water
12. External air break
13. Air gap
14. PVCu starp on fitting
15. 43mm 90° male/female bend
CONDENSATE PIPEWORK RUN EXTERNALLY:
• Pipe work length should be kept to a minimum and
the route as vertical as possible.
• Weather proof insulation must be used.
• Care should be taken when siting a soakaway to
avoid obstructing existing services.
• The condensate pipe work must fall at least 52mm
per metre towards the outlet and should take the
shortest practicable route.
• Ensure there are no blockages in the pipe run.
External connections:
• If no other discharge method is possible then the
use of an externally run condensate drainage pipe
terminating at a suitable foul water discharge point,
or purpose designed soak away, may be considered.
• If this method is chosen then the following measures
should be adopted:
4 The external run be kept as short as possible and
not exceed three metres.
4 The pipe should be run internally as far as possible
before going externally and the pipe diameter
should be increased to 32mm before it passes
through the wall to the exterior.
4 The pipe should be insulated using suitable
waterproof and weather resistant insulation.
4 The external pipe should take the shortest and least
exposed route to the discharge point, and should
"fall" as steeply as possible away from the boiler,
with no horizontal runs in which condensate might
stand.
4 The use of fittings, elbows etc. should be kept to a
minimum and any internal "burrs" on cut pipe work
should be removed so that the internal pipe section
is as smooth as possible.
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 PIPEWORK
EXTERNAL CONNECTION
15