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Condensate pump
Figure 34
Where direct connection to "gravity discharge" pipework 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
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. 34 Condensate pump example
[1]
Condensate discharge from appliance
[7]
Condensate pump
[8]
Pipework transition
[C]
Gravity discharge pipework
Proprietary condensate pump
▶ Ensure minimum and maximum pump lifting heights are followed as
per condensate pump manufacturers instructions.
4.5.4
External connections
NOTICE
Risk of condensate discharge freezing
▶ No external disposal of condensate over 3m in length unless the
CondenseSure siphon or a condensate pump is fitted.
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 down pipe 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 drainage system.
▶ Refer to BS 6798 for more information on condensate disposal.
Greenstar 1000 – 6721835943 (2023/08)
NOTICE
Grey water recovery system
Contamination of recovered water
▶ Condensate disposal shall not be allowed into a grey water recovery
External disposal considerations
NOTICE
Freezing conditions
Frozen condensate will block the condensate drain pipe and stop the
Max.
appliance from running
▶ Pipe lengths should be kept to a minimum and the routed as vertically
C
NOTICE
Condensate waste disposal
Min.
▶ Care should be taken when siting a soak-away to avoid causing
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-designed soak away, may be considered. If this
method is chosen then the following measures should be adopted:
▶ The external run be kept as short as possible and ideally should not
▶ A CondenseSure external siphon accessory (part number:
▶ The pipe should be run internally as far as possible before going
▶ The hole through the wall for the condensate pipe should be sleeved
▶ The external pipe should take the shortest and least exposed route to
▶ The use of fittings, elbows etc. should be kept to a minimum and any
▶ All external pipe drainage will be improved if the end is cut at 45° as
▶ In situations where there are likely to be extremes of temperature or
▶ As well as trace heating, other methods for protecting pipe work that
system that is intended for re-use.
as possible.
damage to existing services and building footings.
exceed three metres.
Additional precaution against freezing must be taken if the external
pipe run does exceed three metres.
7716192746), third party trace heating or third party condensate
pumps must be used where external pipework exceeds three
metres.
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.
and be sealed to the building fabric on the internal and external face
using a suitable building material.
the discharge point, and should "fall" as steeply as possible away
from the appliance, with no horizontal runs in which condensate
might stand.
internal burrs on cut pipe work should be removed so that the internal
pipe section is as smooth as possible.
opposed to a straight cut.
exposure, the use of a proprietary trace-heating system for external
pipe work, incorporating an external frost thermostat, should be
considered. All other guidance above and the instructions for the
trace heating system, should be closely followed.
are run externally should be considered to prevent freezing during
prolonged periods.
– Insulation materials can be used, these should be of class "O"
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.
– The use of a drain cover (such as those to prevent leaf blockage)
may offer further protection from wind chill.
Pre-Installation
27
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