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Worcester-Bosch GB162-80 Manual

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Installation
6720813171 (2016/05)18
Material for condensate
The condensate drainage pipe should be run in a standard drain pipe
material, e.g. PVC (polyvinyl chloride), PVC-U (unplasticized polyvinyl
chloride), BS (acrylonitrile-butadienestyrene), PP (polypropylene
polyprolene) or PVC-C (cross-linked polyvinyl chloride).
Any internal pipework should be of a diameter to match the
requirements of the condensate exit pipe on the appliance.
Termination to internal pipe
The condensate drain pipe should have a minimum outside diameter of
Ø21.5 mm with no length restriction. It should incorporate a trap with a
75 mm condensate seal and be connected to the stack at a point at least
450 mm above the invert of the stack. The trap built into the boiler will
provide this 75 mm ( fig. 19) condensate seal.
The minimum distance between the condensate trap and the
condensate drain pipe is 2 cm. An air gap should be maintained between
the boiler condensate trap and the condensate pipework.
Fig. 19 Termination of condensate drain pipe to internal pipe
[1] Boiler
[2] Internal soil and vent pipe
[3] Invert
[4] No length restriction
External termination via internal branch (e.g. sink waste)
The condensate drain pipe should have a minimum outside diameter of
Ø21.5 mm with no length restriction. The connection should preferably
be made downstream of the sink waste trap. If the connection is only
possible upstream, then an air break is needed between the 2traps.
This is normally provided by the sink waste pipe ( fig. 20 and 21).
Fig. 20 Internal termination of condensate drain pipe to external waste
point
[1] Sink
[2] Boiler
[3] No length restriction
[4] Open end of pipe direct into drain, below ground but above water
level
An air gap should be maintained between the boiler condensate trap and
the condensate pipework.
Fig. 21 External termination of condensate drain pipe via internal
discharge branch (e.g. sink waste – proprietary fitting) and
condensate trap
[1] Sink
[2] Boiler
[3] No length restriction
[4] Open end of pipe direct into drain, below ground but above water
level
Condensate absorption point
The condensate drain pipe should have a minimum outside diameter of
Ø21.5 mm and the external pipe length should not be more than 3 m.
The condensate absorption point should be sited in a convenient
position as close as possible to the boiler but not in the vicinity of other
services. See fig. 22 for information.
Ensure that the condensate trap is filled with water.
Ø21.5 mm min.
450 mm min.
6 720 648 726-019.1TD
4
3
2
1
Ø21.5 mm min.
4
3
2
1
6 720 648 726-020.1TD
Ø21.5 mm min.
4
3
2
1
6 720 648 726-021.1TD
… 18 …


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