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Connection of condensate drainage pipe to
internal soil and vent stack.
C
Dimensions in mm
Fig. 5.2
A Boiler
B Internal soil and vent stack
C Invert
D 450 mm up to three storeys
Connection of condensate drainage pipe
downstream of a sink waste trap
Condensate
drain
E
Dimensions in mm
Fig. 5.3
A Boiler
E Sink
F Open end of condensate drainage pipe
direct into gully below grating but above
water level
5.8
Water circulation (c.h.)
Detailed recommendations are given in BS
6798, BSEN 12828: 2003, BSEN 12831:
2003 & BSEN 14446: 2004; the following
- 28 -
- 28 -
GENERAL REQUIREMENTS
A
Condensate
drain
B
D
A
F
notes are given for general guidance.
For Ireland (IE), refer to I.S.813.2002.
Pipework
The return temperature must not be lower of
40 °C. Copper tubing to BSEN 1057 is rec-
ommended for water pipes. Jointing should
be either with capillary soldered or with com-
pression fittings.
Where possible pipes should have a gradi-
ent to ensure air is carried naturally to air
release points and water flows naturally to
drain taps.
The appliance has a built-in automatic air
release valve, it should be ensured as far as
possible that the appliance heat exchanger
is not a natural collecting point for air.
Except where providing useful heat, pipes
should be insulated to prevent heat loss and
to avoid freezing.
Particular attention should be paid to pipes
passing through ventilated spaces in roofs
and under floors.
By-pass
The appliance includes an automatic by-
pass valve which protects the main heat
exchanger in case of reduced or interrupted
water circulation through the heating system
due to the closing of thermostatic valves or
cock-type valves within the system.
The by-pass is calibrated to assure a mini-
mum flow of 200-300 lts/hr through the main
heat exchanger.
If you are installing a system that includes
thermostatic radiator valves (TRV) and/or
small bore (8-10 mm) it may be necessary
to fit an external by-pass to facilitate correct
operation of the boiler.
The fitting of an external bypass helps to
prevent and limit system noise.
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