Condensate Pipe Work; Internal Connections; External Connections - Worcester Greenstar Highflow 440CDi ERP Installation, Commissioning And Servicing Instructions

3.4

Condensate pipe work

NOTICE:
▶ Where a new or replacement boiler is being installed,
access to an internal "gravity discharge" point should
be one of the factors considered in determining
boiler location.
▶ The condensate pipe must be nominally
22mm Ø plastic pipe.
▶ The condensate pipe work must fall at least 52mm
per metre towards the outlet and should take the
shortest practicable route.
▶ Ensure there are no blockages in the pipe run.
3.4.1

Internal connections

In order to minimise risk of freezing during prolonged cold spells, the
following methods of installing condensate drainage pipe should be
adopted, in order of priority.
Wherever possible, the condensate drainage pipe should be routed and
terminated so that the condensate drains away from the boiler under
gravity to a suitable internal foul water discharge point such as an
internal soil and vent stack. A suitable permanent connection to the foul
waste pipe should be used.
2
1
Fig. 6 Disposal to soil vent stack
Alternatively if the first option is not possible an internal kitchen or
bathroom waste pipe, washing machine waste pipe etc. can be used.
2
1
Fig. 7 Disposal to a waste pipe
Key to condensate illustrations
1 Condensate discharge from boiler
2 Condensate pump within boiler
3 Soil and vent stack
4 Sink or basin with integrated overflow
5 75mm sink waste trap
*
Condensate trap of 75mm already incorporated into the boiler
6720818077 (2016/04) -
Greenstar Highflow CDi
3
6720648568-06.1Wo
22mm Ø
4
75mm
min.
5
ErP
3.4.2

External connections

NOTICE: Freezing conditions
▶ Pipe work length should be kept to a minimum and
the route as vertical as possible.
▶ Weather proof insulation must be used.
NOTICE: Condensate waste
▶ Care should be taken when siting a soak-away to
avoid obstructing existing services.
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 not exceed three
metres.
▶ The pipe should be run internally as far as possible before going
externally and the pipe diameter should be increased to 32mm
before it passes through the wall to the exterior. The pipe should be
insulated using suitable waterproof and weather resistant insulation.
▶ 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 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
internal pipe section is as smooth as possible.
Fitting an external air break
• Refer to figure 8 when a rain water down pipe is used to dispose of
condensate.
NOTICE: Appliance/property damage
▶ An air break must be installed in the 43mm pipe
work, between the boiler condensate outlet and the
drainpipe, outside the property, to avoid appliance/
property damage should the down pipe become
blocked.
6
2
1
Fig. 8 Disposal into a rainwater down pipe
Condensate drainage pipe can be run above or below
ground.
Where the pipe terminates over an open drain or gully, the pipe should
terminate below the grating level, but above water level, in order to
minimise "wind chill" at the open end.
The use of a drain cover (such as those used to prevent blockage by
leaves) may offer further protection from wind chill.
PRE-INSTALLATION
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