Pressure Relief Pipe Work - Worcester Greenstar Highflow 440CDi ERP Installation, Commissioning And Servicing Instructions

PRE-INSTALLATION
Pipe drainage will be improved if the end is cut at 45° as opposed to a
straight cut.
6
1
2
Fig. 9 External disposal
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
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.
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.
14
7
25mm min.
Fig. 10 Soak away
3.5
• The pressure relief drain [1 or 3] should be run in at least 15mm
• Plastic pipework must be properly supported with a maximum 300
• The pipe [1 or 3] should be finished with a partial bend, near the
Fig. 11 Pressure relief pipe work
[2]
[1, 3] Drain pipe
[4]
6
1
2
13
14

Pressure relief pipe work

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.
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.
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.
outlet to face the external wall (as shown) to help prevent freezing.
1
2
3
4
4
Outside wall
External drain
Greenstar Highflow CDi
400mm min.
25mm min.
500mm min.
7
13
14
16
15
1
2
2
3
ErP - 6720818077 (2016/04)