External Connections - Worcester GREENSTAR Ri Installation And Servicing Instructions

PRE-INSTALLATION
3.4.2

EXTERNAL CONNECTIONS

NOTICE: Freezing conditions
B Pipe work length should be kept to a
minimum and the route as vertical as
possible.
B Where pipe work is subjected to extreme
cold or wind chill, a weather proof
insulation should be used.
NOTICE: Condensate waste
B Care should be taken when siting a soak-
away to avoid obstructing existing
services.
B Condensate waste must not be
terminated into a septic tank or cesspit.
Continued - Key to condensate illustrations
8 68mm Ø PVCu strap on fitting
9 100 mm 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
15 External air break
16 Air gap
17 External rain water pipe into foul water
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:
B The external run be kept as short as possible and not
exceed three metres.
B 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. The pipe should be insulated
using suitable waterproof and weather resistant
insulation.
B 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.
B 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.
14
FITTING AN EXTERNAL AIR BREAK
• Refer to figure 9 when a rain water down pipe, that
goes directly into a sewer that carries both rainwater
and foul water, is used to dispose of condensate.
• An air break must be installed in the 43 mm pipe work,
between the boiler condensate outlet and the
drainpipe, outside the property, to avoid flooding
during adverse weather conditions.
1
14
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.
Pipe drainage will be improved if the end is cut at 45°
angle as opposed to a straight cut.
1
14
Fig. 10 External disposal
6 720 644 744a (2010/10)
17
13
15
16
7 8
13
25mm min.