Pre-Installation
Greenstar Danesmoor External
ErP+
and External System
ErP+
6720821725 (2018/04) 15
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 from wind chill.
Pipe drainage will be improved if the end is cut at 45° as opposed to a
straight cut.
Fig. 14 External drain
4.5.2 Soak away
• The condensate drainage pipe may be run above or below 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 filled with and 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 Disposal to a soakaway
4.6 Pressure relief pipework
• The pressure relief discharge pipe [2]should be at least 15 mm
diameter copper pipe and run downwards away from the boiler and
discharge away from any electrical or other hazard, preferably to an
external drain or soakaway.
• Pipe [2] should be finished with a partial bend, near the outlet to
prevent discharge onto entrances or other public access where it
could cause a hazard.
Fig. 16 Pressure relief pipe work
[1] External casing
[2] PRV discharge pipe
[3] Hardstanding
NOTICE: Condensate waste
▶ Care should be taken when siting a soak-away to
avoid obstructing existing services.
Minimum hole size for the condensate soak away must be
400mm deep by 300mmØ .
25mm min.
6720809437-05.1Wo
5
2
1
6
21.5mm Ø
25mm min.
500mm min.
Unsuitable for clay soil types.
400mm min.
6720809437-06.2Wo
5
2
1
6
21.5mm Ø
15
13
14
12
12
13
Key to condensate soakaway
1 Condensate discharge from boiler
2 Universal connector
5 Pipe work transition
6 Insulate and increase pipe size
12 100mm Ø minimum plastic pipe
13 Drainage holes
14 Limestone chippings (25kg min.)
15 Bottom of sealed tube
* Condensate trap of 75mm already incorporated into the boiler
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