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Connection of condensate drainage pipe to in-
ternal soil and vent stack.
Condensate
drain
C
E
Dimensions in mm
Fig. 5.2
A Boiler
B Visible air break
C 75 mm trap
D Internal soil and vent stack
E Invert
F 450 mm up to three storeys
Connection of condensate drainage pipe
downstream of a sink waste trap
Condensate
drain
I
C
G
Dimensions in mm
Fig. 5.3
A Boiler
B Visible air break
C 75 mm trap
G Sink
H Open end of condensate drainage pipe
direct into gully below grating but above
water level
I
Sink lip
GENERAL REQUIREMENTS
A
B
D
F
A
B
H
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 recommended
for water pipes. Jointing should be either with
capillary soldered or with compression fittings.
Where possible pipes should have a gradient
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 re-
lease 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 circu-
lation 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 op-
eration of the boiler.
The fitting of an external bypass helps to pre-
vent and limit system noise.
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