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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 and BS 5449; the following notes are
given for general guidance.
For Ireland (IE), refer to I.S.813.2002.
Pipework
Copper tubing to BSEN 1057 is recom-
mended for water pipes. Jointing should be
either with capillary soldered or with com-
pression fi ttings.
Where possible pipes should have a gradi-
ent to ensure air is carried naturally to air
release points and water fl ows 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
GENERAL REQUIREMENTS
A
F
to avoid freezing.
Particular attention should be paid to pipes
passing through ventilated spaces in roofs
and under fl oors.
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 fl ow 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 fi t an external by-pass to facilitate correct
operation of the boiler.
The fi tting of an external bypass helps to
prevent and limit system noise.
Air release points
These must be fi tted a tall high points where
air will natural collect and must be sited to
facilitate complete fi lling of the system.
Expansion vessel
The appliance has an integral sealed expan-
sion vessel to accommodate the increase of
water volume when the system is heated.
Refer to Fig. 4.5 on page 23 for its techni-
cal data.
If the
heating circuit has an unusually high
water content, calculate the total expansion
and add an additional sealed expansion
vessel with adequate capacity.
Mains water feed: central heating
There must be no direct connection to the
mains water supply even through a non re-
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