External Connections - Worcester Greenstar 2000 Installation And Maintenance Instructions Manual

Pre-Installation
4.5.4

External connections

NOTICE
Risk of condensate discharge freezing
▶ No external disposal of condensate 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.
NOTICE
Grey water recovery system
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 lengths should be kept to a minimum and the routed as vertically
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-designed soak away, may be considered. If this
method is chosen then the following measures should be adopted:
▶ A CondenseSure external siphon accessory (part number:
7716192746) or third party condensate pump must be used.
▶ 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.
30
▶ The external pipe should take the shortest and least exposed route to
the discharge point, and should "fall" as steeply as possible away
from the appliance, 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 internal
pipe section is as smooth as possible.
▶ All external pipe drainage will be improved if the end is cut at 45° as
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
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.
▶ As well as trace heating, other methods for protecting pipe work that
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.
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).
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1
Fig. 34 Additional protection for transition through a wall
[1] Internal face sealed (32mm pipe sealed to sleeve)
[2] 40mm sleeve
[3] External face sealed (32mm pipe sealed to sleeve)
[4] Insulation recessed into the wall
[5] Condensate discharge pipe
Good Practice
▶ The following guidance indicates the good practices that must be
maintained for the Installation and Maintenance of a product.
Greenstar 2000 – 6 721 820 552 (2021/02)
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0010026770-002