0020308118_05 Installation and maintenance instructions 29
▶ For the condensate discharge pipe, use pipes that have
an internal diameter of at least 19 mm (30 mm internal
diameter for all of those that are led out of the building).
– The condensate discharge pipework must have
a continuous fall (45 mm per metre) and should
whenever possible terminate at a suitable discharge
point within the heated envelope of the building
that will remain frost free under long periods of low
external temperatures.
Note
Ensure that the connection between the con-
densate discharge pipe and a sewage pipe is
not air-tight.
▶ During installation remove all burs from inside of cut pipe
work and avoid excessive adhesive which may trap small
pockets of water close to the pipe wall which can freeze
and build into a larger ice plug.
▶ As with other pipe work insulate the condensate dis-
charge pipe to minimise any risk of freezing and beware
when crossing cavities that the fall is maintained and the
pipe sleeved.
▶ Ensure that the condensate discharge pipe terminates in
a suitable location. Further information can be obtained
from BS 6798 Specification for installation of gas–fired
boilers of rated input not exceeding 70 kW net.
▶ Follow the instructions listed here and observe directives
and local regulations on condensate discharge.
▶ To connect the condensate discharge pipe to the con-
densate siphon, use the condensate adapter (1) from
the bag of small parts (recommendation). Follow the
enclosed installation instructions. The condensate ad-
apter has aeration. However, avoid a tight connection to
a waste-water pipework. If you do not use the accessory
from the bag of small parts, note that the connection to
the siphon must not be rigid. You must install a remov-
able part so that maintenance can be carried out on the
siphon.
▶ Fill the condensate siphon. (→ Section 9.12)
Where preferential to do so, it is permitted to combine the
outlets for condensate and pressure relief valve from the
appliance outside the boiler casing. (→ Section 7.9)
7.8.1 Condensate discharge systems
It is not necessary to provide extra traps in the discharge
pipe as there is already a trap inside the boiler. Fitting an
extra trap may cause the boiler siphon to work incorrectly.
Refer to BS5546 or BS6798 for further advice on disposal of
boiler condensate.
7.8.1.1 Direct Connection to internal soil and vent
stack
Preferred option
7.8.1.2 Direct connection to external soil and vent
stack
7.8.1.3 External termination to gulley or hopper
Best practice
7.8.1.4 Internal termination into combined sink
waste
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