INSTALLATION INSTRUCTIONS
TR05A153.B1107
21
4.5 Condensate drain
Failure to install the condensate discharge pipe work
correctly will affect the reliable operation of the boiler.
The condensate discharge pipe
must not rise
at any
point along its length. There
must
be a fall of
at least
2.5° (50mm per metre) along the entire run.
The boiler condensate trap is fitted with a 1 metre
length of 25mm flexible pipe which should generally
discharge internally into the household drainage
system. If this is not possible, discharge into an outside
drain is acceptable.
Ensure the discharge of condensate complies with any
national or local regulations in force.
The discharge pipe should be run in a proprietary
plastic drain pipe material. Metal pipe work is NOT
suitable for use in condensate discharge systems.
The pipe should be a minimum of 21.5 mm diameter
and must be supported using suitably spaced clips to
prevent sagging. To reduce the risk of condensate
being trapped, as few bends and fittings as possible
should be used.
Any condensate discharge pipe work external to the
building (or in an unheated area, e.g. garage) must be
insulated to protect against frost. It is also
recommended that the pipe diameter is increased to
32mm. Any pipe run external to the building must not
exceed 3 metres in length.
If the boiler is fitted in an unheated location the entire
condensate discharge pipe should be treated as an
external run.
When discharging condensate into a soil stack or waste
pipe the effects of existing plumbing must be
considered. If soil pipes or waste pipes are subjected to
internal pressure fluctuations when WCs are flushed or
sinks emptied then back pressure may force water out
of the boiler trap and cause appliance lockout.
450mm min
Holes in the soak-away must
face away from the building
500mm min
External termination to a purpose made soak-away
External termination to a drain or gully
Pipe must terminate above
water level but below
surrounding surface
50mm per m
etre of pipe
run
2.5° Minimu
m fall
50mm per m
etre of pipe
run
2.5° Minimu
m fall
Boiler
Pipe must terminate above
water level but below
surrounding surface
50mm per m
etre of pipe
run
2.5° Minimu
m fall
External termination via internal discharge
branch e.g. sink waste - downstream
Sink
2.5° Minimu
m fall
50mm per m
etre of pipe
run
Termination to an internal soil and vent pipe
Boiler
Boiler
Boiler
Figure 14: Condensate drain configuration
