Worcester Greenstar FS 30CDi Installation, Commissioning And Servicing Instructions page 13

FITTING AN EXTERNAL AIR BREAK
• Refer to figure 9 when a rain water down pipe is used to dispose of
condensate.
NOTICE: Appliance damage
An air break must be installed in the 43mm pipe
work, between the boiler condensate outlet and the
drainpipe, outside the property, to avoid appliance
damage should the down pipe become blocked.
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Fig. 9 Disposal into a rainwater down pipe
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.
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Fig. 10 External disposal
ErP
Greenstar FS CDi 6720818079 (2016/04)
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25mm min.
Continued - Key to condensate illustrations
6 Pipe work transition
7 Insulate and increase pipe size
8 External rain water pipe into foul water
9 External air break
10 Air gap
11 PVCu strap-on fitting
12 43mm 90° male/female bend
13 100mm Ø minimum plastic pipe
14 Drainage holes
15 Limestone chippings
16 Bottom of sealed tube
*
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 filled with and surrounded by at least 100mm of
limestone chippings to a minimum depth of 400mm.
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.
NOTICE: Unheated internal areas.
Internal pipe runs in unheated areas such as lofts,
basements and garages should be treated as
external runs.
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Fig. 11 Soak away
PRE-INSTALLATION
400mm min.
25mm min.
500mm min.
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