INSTALLATION
6 720 648 726 (2011/07)
24
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
(
Æ
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 two traps. This is normally provided by the
sink waste pipe (
Æ
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.
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
