INSTALLATION INSTRUCTIONS
16
3.5 Condensate drain
FAILURE
TO
INSTALL
THE
CONDENSATE
DISCHARGE
PIPEWORK
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° (1” per 20”) along the entire run.
I. The condensate outlet terminates in
7/8” nut and
seal for the connection of
7/8” plastic overflow pipe
which should generally discharge internally into the
household drainage system. If this is not possible,
discharge into an outside drain is acceptable.
2. Ensure the discharge of condensate complies with
any national or local regulations in force.
3. The discharge pipe should be run in a proprietary
drain pipe material e.g. PVC, PVC-U, ABS, PVC-C or
PP.
4. Metal pipe work is NOT suitable for use in
condensate discharge systems.
5. The pipe should be a minimum of
7/8” diameter and
must be supported using suitably spaced clips to
prevent sagging.
6. Any pipe fitted externally must not exceed 10 feets.
7 Any condensate discharge pipe work external to the
building (or in an unheated part of it e.g. garage) must
be insulated to protect against frost. It is also
recommended that the pipe diameter is increased to 1
¼”.
8. If the boiler is fitted in an unheated location the
entire condensate discharge pipe should be treated as
an external run.
9. In alI cases discharge pipe must be installed to aid
disposal of the condensate. T o reduce the risk of
condensate being trapped, as few bends and fittings
as possible should be used.
10. 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 WC's are
flushed or sinks emptied then back-pressure may
force water out of the boiler trap and cause appliance
lockout.
Examples are shown of the following methods of
termination:-
i) to an internal soil & vent pipe
ii) via an internal discharge branch (e.g. sink waste)
iii) to a drain or gully
iv) to a purpose made soak away
18" min
Holes in the soak-away must
face away from the building
20" 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
1" per 20
" of pipe
run
2.5° Minim
um fall
1" per 20
" of pipe
run
2.5° Minim
um fall
Boiler
Pipe must terminate above
water level but below
surrounding surface
1" per 20
" of pipe
run
2.5° Minim
um fall
External termination via internal discharge
branch e.g. sink waste - downstream
Sink
2.5° Minim
um fall
1" per 20
" of pipe
run
Termination to an internal soil and vent pipe
Boiler
Boiler
Boiler
Summary of Contents for PCH 18
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