PRE-INSTALLATION
Greenstar Highflow CDi
ErP
- 6720818077 (2016/04)
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Pipe drainage will be improved if the end is cut at 45° as opposed to a
straight cut.
Fig. 9
External disposal
CONDENSATE 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 minimum 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. 10 Soak away
3.5
Pressure relief pipe work
• The pressure relief drain [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 pipework must be properly supported with a maximum 300
mm between supports to prevent sagging and run downwards away
from the boiler and discharge away from any electrical or other
hazard, preferably to an external drain or soak-away.
• The 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. 11 Pressure relief pipe work
[2]
Outside wall
[1, 3] Drain pipe
[4]
External drain
Continued - Key to condensate illustrations
6
Pipe work transition
7
Insulate and increase pipe size
8
External rain water pipe into foul water
9
External air break
10
Air gap
11
PVCu strap on fitting
12
43mm 90° male/female bend
13
100mm Ø minimum plastic pipe
14
Drainage holes
15
Limestone chippings
16
Bottom of sealed tube
*
Condensate trap of 75mm already incorporated into the boiler
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.
25mm min.
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NOTICE:
Debris from the system can damage the boiler
and reduce efficiency. Failure to comply with the
guidelines for the use of water treatment with the
appliance will invalidate the appliance warranty.
7
500mm min.
25mm min.
400mm min.
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15
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