Pressure Relief Pipework - Bosch Worcester Greenstar Utility 32/50 Installation, Commissioning And Servicing Instruction Manual

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Fig. 16 Condensate pump to external disposal
CONDENSATE SOAK-AWAY
Condensate soak-away considerations
Before deciding to use a soak-away, the ability of the surrounding area
should be accessed for the ability to disperse the condensate.
Areas prone to flooding and ground with a high clay content can result in
a blocked condensate pipe in freezing conditions.
Although it is possible to increase the size of the soak-away and amount
of limestone chippings in clay soil areas, if the clay content is high,
preventing effective dispersal of the condensate, then a soak-away
would be ineffective and an alternative method of disposal must be
sought.
• 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 minimum of
limestone chippings to a 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 and consideration should be given to using a
CondenseSure siphon.
Not recommended for heavy clay soil types
Greenstar Utility ErP - 6 720 821 751 (2018/04)
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25mm min.
6720644744-12.4Wo
Fig. 17 Discharge to a soakaway
4.6
• The pressure relief drain pipe [K] should be at least 15mm diameter
copper pipe and run downwards away from the appliance and
discharge away from any electrical or other hazard, preferably to an
external drain or soak-away.
• Pipe [K] should be finished with a partial bend, near the outlet, to
face the external wall (as shown) to help prevent freezing.
Fig. 18 Pressure relief pipe work
[J] Outside wall
[K] Drain pipe
[L] External drain
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500mm min.
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Pressure relief pipework

CAUTION: Scalding injury
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.
K
J
K
L
Pre-Installation
400mm min.
25mm min.
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