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Pre-Installation
Condensate pump
figure 13
Where direct connection to "gravity discharge" is not physically
possible, or where very long internal runs would be required to reach a
suitable discharge point, condensate should be removed using a
proprietary condensate pump, of a specification recommended by the
boiler or condensate pump manufacturer.
• The pump outlet should discharge to a suitable "gravity discharge"
outlet.
– The condensate then flows, by gravity, through the 22mm plastic
pipe to the condensate discharge point.
8
1
7
Fig. 13 Condensate pump disposal
4.5.4
External connections
NOTICE: Septic tanks
Untreated condensate must not be allowed into septic
tanks.
▶ Connection to systems which drain into a septic tank
should be avoided due to the risk of affecting
anaerobic bacteria.
NOTICE: Rainwater or external drain disposal
Untreated condensate must not be allowed to flow into
streams or rivers
▶ A rainwater down pipe or an external drain shall only
be used for condensate disposal if the down pipe or
external drain is connected to a combined foul and
rainwater system
▶ Refer to BS 6798 for more information
NOTICE: Grey water systems
Contamination of recovered water
▶ Condensate disposal shall not be allowed into a grey
water recovery system that is intended for re-use
External disposal considerations
NOTICE: Freezing conditions
Frozen condensate will block the condensate drain pipe
and stop the appliance from running.
▶ Pipe work length should be kept to a minimum and
the route as vertical as possible.
NOTICE: Condensate waste disposal
▶ Care should be taken when siting a soak-away to
avoid causing damage to existing services and
building footings.
If no other discharge method is possible then the use of an externally run
condensate drainage pipe terminating at a suitable foul water discharge
point, or purpose-built soak away, may be considered. If this method is
chosen then the following measures should be adopted:
16
▶ The external run be kept as short as possible and ideally should not
exceed three metres.
Additional precaution against freezing must be taken if the external
pipe run does exceed three metres.
▶ The pipe should be run internally as far as possible before going
externally and the pipe diameter should be increased to a minimum
internal diameter (ID) of 30mm before it passes through the wall to
the exterior.
▶ The hole through the wall for the condensate pipe should be sleeved
and be sealed to the building fabric on the internal and external face
using a suitable building material.
▶ The external pipe should take the shortest and least exposed route to
the discharge point, and should "fall" as steeply as possible away
Max.
from the boiler, with no horizontal runs in which condensate might
stand.
▶ The use of fittings, elbows etc. should be kept to a minimum and any
internal "burrs" on cut pipe work should be removed so that the
C
internal pipe section is as smooth as possible.
▶ All external pipe drainage will be improved if the end is cut at 45° as
Min.
opposed to a straight cut.
▶ In situations where there are likely to be extremes of temperature or
exposure, the use of a proprietary trace-heating system for external
pipework, incorporating an external frost thermostat, should be
considered. All other guidance above and the instructions for the
trace heating system, should be closely followed.
▶ As well as trace heating, other methods for protecting pipework that
are run externally should be considered to prevent freezing during
prolonged cold periods.
– Insulation materials can be used, these should be of class "O"
– The use of a drain cover (such as those to prevent leaf blockage)
Additional protection for transition through a wall
The external pipework can be insulated to help prevent freezing during
prolonged cold periods.
• Where insulation is required, the entire run of external pipework [5]
should be insulated with a recess in the external face allowing better
insulation protection coverage [4] as it transitions to the outside of
the building.
• The hole through the wall must be sealed to the building fabric on the
internal [1] and external [3] face using a suitable building material,
(use a 40mm sleeve [2] to pass the condensate pipework through
and then seal the internal and external faces).
Fig. 14 Additional protection for transition through a walll
[1]
[2]
[3]
[4]
[5]
grade with an outer coating that is weather proof and have a UV
resistant finish. A minimum of 19mm thick insulation is
recommended for 32mm external pipes.
may offer further protection from wind chill.
2
1
Internal face sealed (32mm pipe sealed to sleeve)
40mm sleeve
External face sealed (32mm pipe sealed to sleeve)
Insulation recessed into the wall
Condensate discharge pipe
Greenstar Heatslave II
3
4
5
0010026770-002
2022 +
6 721 843 978 (2022/01)
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