Pressure Relief Pipe Work - Worcester GREENSTAR 24 Installation, Commissioning And Servicing Instructions

Pre-Installation
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.
*
1
500mm min.
13
14
9
11
12
Fig. 12 Soak away
14
*
1
7
Fig. 13 Condensate pump to external disposal
3.5

PRESSURE RELIEF PIPE WORK

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.
• The pressure relief drain pipe (1) from the boiler should be at least
15mm diameter copper pipe and run downwards, away from any
electrical equipment or other hazard, preferably to an external drain
or soak away.
12
• 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.
9
10
25mm min.
Fig. 14 Pressure relief pipe work
400mm
2
min.
10
1,3
4
Table 10 Key to fig 7
13
25mm min.
6720644744-12.2Wo
1
2
3
4
6720643895-08.1Wo
Outside wall
Drain pipe
External drain
6 720 811 922 (2014/07)