Worcester Greenstar 2000 Installation And Maintenance Instructions Manual page 31

Rain water down pipe with external air break
 Figure 35
• Refer to following example to dispose of condensate to a rain water
down pipe.
• An air break or rain water hopper must be utilised, between the
appliance condensate outlet and the drainpipe, outside the property,
to avoid flooding of the appliance should the downpipe become
obstructed.
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8
9
1
8
9
Fig. 35 Disposal into rain water down pipe
[1] Condensate discharge from appliance
[8] Pipework transition
[9] Appliances with small capacity trap without CondenseSure
accessory fitted. ( page 32)
[10] External rain water pipe to foul water
[11] External air break
[12] Air gap
[13] Strap-on fitting
[14] 43mm 90° male/female bend
[20] Rain water hopper
[21] Increase pipe size
Greenstar 2000 – 6 721 820 552 (2021/02)
Open drain or gully with external air break
 Figure 36
Where the pipe terminates over an open drain or gully and there is a risk
of ground flooding, then the additional requirement below is
recommended:
• An air break should be installed in the external pipework as shown to
10
11
12
13
14
Fig. 36 Disposal to open drain or gully with air break
21
[1]
[8]
20
[9]
[11] External air break
12
[21] Increase pipe size
Condensate soak away considerations
10
Before deciding to use a purpose-made soak away the history of the
locality and the ability of the surrounding area to disperse the
condensate should be taken into account, e.g. areas prone to flooding
and ground with a high clay content can result in poor drainage with an
increased risk of water logging or freezing causing the condensate pipe
to become obstructed by water or ice and the boiler to shut down,
Although it is possible to increase the size of the soak away and the area
with limestone chippings in clay soil areas, if the clay content is high and
prevents effective dispersal of the condensate then a soak away may not
be a suitable means of condensate disposal and an alternative method
should be used.
Condensate soak away with external air break
 Figure 37
• Refer to following example to dispose of condensate to a soak away.
• The condensate soak away must be sited at least 500mm away from
• The condensate drainage pipe may be run above or below the ground
• The soak away must use a minimum of a 100mm Ø plastic tube with
• The tube must be surrounded by at least 100mm of limestone
• An air break must be installed in the external pipework as shown to
Minimum hole size for the condensate soak away must be 400mm deep
by Ø 300mm.
avoid an airlock during ground flooding/adverse weather conditions
which could prevent the condensate from discharging.
1
21
8
Condensate discharge from appliance
Pipework transition
Additional protection for transition through a wall. ( page 30)
building footings.
to the soak away. The following example shows drainage pipe run
above ground.
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.
chippings to a depth of 400mm.
avoid an airlock during ground flooding/adverse weather conditions
which could prevent the condensate from discharging.
Pre-Installation
9
11
21
25mm min.
31