Pressure Relief Pipework - Benchmark 27i System Compact Installation, Commissioning And Servicing Instructions

PRE-INSTALLATION
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1
7
Fig. 9 Condensate pump to external disposal
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 surrounded by at least 100mm 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
pipework, 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.
*
1
500mm min.
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14
9
11
12
Fig. 10 Soak away
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4.5
13
25mm min.
• The pressure relief drain pipe (1) from the boiler should be at least
6720644744-12.3Wo
15mm diameter copper pipe and run downwards, away from any
electrical equipment or other hazard, preferably to an external drain
or soak away.
• The pressure relief drain pipe (1) should be finished with a partial
bend, near the outlet to face the external wall (as shown) to help
prevent freezing.
Fig. 11 Pressure relief pipework
[2]
9
[1, 3] PRV drain pipe
[4]
10
25mm min.
400mm
min.
10

PRESSURE RELIEF PIPEWORK

NOTICE:
▶ The pressure relief valve is a safety device for the
boiler 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.
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2
3
4
Outside wall
External drain
Greenstar i System Compact
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6720646608-123.1Wo
ErP - 6 720 813 280 (2015/07)