Condensate Pipework - Bosch WORCESTER Greenstar CDi Classic Series Technical Information

Condensate pipework

Important points to consider when siting a condensate
drainage pipe:
•
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 a minimum of 22mm dia.
plastic pipe
•
The condensate pipework 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.
Internal connections
In order to minimise the risk of freezing during prolonged
cold spells, the following methods of installing a 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. (see fi g. 1)
Alternatively, if the fi rst option is not possible, an internal
kitchen, bathroom or washing machine waste pipe, etc. can
be used. (see fi g. 2)
Condensate pump
Where "gravity discharge" to an internal termination 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 specifi cation recommended by the boiler or condensate
pump manufacturer.
The pump outlet pipe should discharge to a suitable internal
foul water discharge point such as an internal soil and vent
stack, internal kitchen, bathroom or washing machine waste
pipe, etc. A suitable permanent connection to the foul waste
pipe should be used. (see fi g. 3)
38 38
Soil
Siphon
& vent
trap
stack
22mm dia.
Fig. 1 Disposal to soil vent stack
Siphon
Visable air break
trap
at plug hole
100mm
22mm dia.
75mm min.
Fig. 2 Disposal to a waste pipe
Siphon
trap
22mm
dia.
Condensate
pump
Fig. 3 Condensate pump disposal
Min. 450mm &
up to 3 storeys
Sink with
integrated
overflow
75mm sink
waste trap
Visable air break
at plug hole
Sink with
integrated
overflow
75mm min.
75mm sink
waste trap