PRE-INSTALLATION
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19
CONDENSATE SOAK AWAY
• The condensate soak away must be sited at least 500mm away from
building footings.
• 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.
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.
Fig. 15 To a soakaway
4.4
PRESSURE RELIEF PIPE WORK
• The pressure relief discharge pipe [1 or 3] should be run in at least
15mm diameter copper pipe or pipe made of a material that will
withstand PRV discharge temperatures and pressures and which
complies to BS 5252 or BS EN 1451.
• The connection to the PRV must be made in copper pipe. Plastic pipe
work must be properly supported with a maximum of 300mm
between supports to prevent sagging and run downwards away from
the appliance.
• The pressure relief should discharge away from any electrical or
other hazard, preferably to an external drain or soak away.
• Pipe [1 or 3] should be finished with a partial bend, near the outlet to
face the external wall (as shown) to help prevent freezing.
Fig. 16 Pressure relief pipe work
[1]
Discharge pipe (turned back onto external wall example)
[2]
Outside wall
[1]
Discharge pipe (into drain or gully example)
[4]
External drain
4.4.1
Alternative PRV connections - Combined PRV/condensate
The PRV or a combined PRV/ condensate discharge can be connected
into a suitable internal waste system, the installer must ensure that all
the pipe work, including the waste pipe, is capable of withstanding PRV
temperatures and pressures.
Worcester, Bosch Group endorses a PRV or a combined PRV/
Condensate internal discharge system, provided that a Hotun hiflo
tundish is employed. The tundish is manufactured by RA Tech UK and is
WRAS approved, information on the tundish can be found at
www.hotun.co.uk.
The guidance of BS 6798 sections 6.3.5 and 6.4.3.2a and RA Tech UK
and must be followed.
Minimum hole size for the condensate soak away must be
400mm deep by 300mmØ .
NOTICE:
Unheated internal areas.
▶ Internal pipe runs in unheated areas such as lofts,
basements and garages should be treated as external
runs and consideration should be given to using a
CondenseSure siphon.
6720819188-06.6Wo
500mm min.
25mm min.
400mm min.
9
16
18
17
19
15
15
16
1
8
11
NOTICE:
▶ The pressure relief valve is a safety device for the
appliance and if activated may discharge boiling water
or steam through the relief valve drain pipe.
▶ Care should be taken when siting the outlet pipe so
that it does not cause an obstruction or discharge
above a window, entrance or other public access
where it could cause a hazard.
1
2
3
4
2
3
4
1
2
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Summary of Contents for Worcester GREENSTAR 12Ri ErP +
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