It is not necessary to provide air breaks or extra traps in the discharge pipe as there is already a
75mm high trap inside the boiler. Fitting an extra trap may cause the boiler siphon to work
incorrectly.
Refer to BS5546 or BS6798 for advice on disposal of boiler condensate.
1. Preferably the drain pipe should run and terminate internally to the house soil and vent
stack at least 450mm above the invert of the stack. There must be an air break in the
discharge pipe upstream of the trap. This should be designed so that the condensate
cannot be discharged into the house if the condensate drain pipe becomes blocked.
2. Connecting into the internal discharge branch (e.g. sink waste or washing machine) with
an external termination, the condensate drain pipe should have a minimum diameter of
22mm with no length restriction and preferably made down stream of the sink waste trap,
if the connection is only possible up stream, then an air break is needed between the
two traps. This is normally provided by the sink waste.
3. Termination in a gully (5) below grid level (6) and above the water level. The external
pipe length should be kept as short as possible to minimise the risk of freezing and
should not be more than 3 metres.
4. At a condensate absorption point (soak away) (7). The external pipe length should not
be more than 3 metres.
Refer to the latest issue of BS 6798 Specification for installation of gas fired boilers of rate input
not exceeding 70kW net for further information.
Before operating the boiler the condensate trap must be filled with water.
4.3.6 Installing the flue system
● Install the flue system (refer to the separate air/flue duct installation instructions).
4.4 Electrical connections
WARNING:
This appliance must be earthed. Electrocution caused by touching live parts can be fatal.
Before working on the appliance, turn off the power supply and secure against restart.
The boiler must be earthed.
All system components shall be of an approved type and all wiring to current I.E.E. wiring
regulations. External wiring must be correctly earthed, polarised and in accordance with the
relevant standards.
In GB this is BS 7671.
In IE this is the current edition of I.S.813 “Domestic Gas Installations”.
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