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boiler;
• the number of bends and joints should be
kept at minimum;
• the drain pipe should be adequately fixed
to prevent pipe sagging.
If a part of the drainpipe runs externally this
part should be kept as short as possible and
protected to reduce the risk of freezing.
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
GENERAL REQUIREMENTS
A
Condensate
drain
B
D
A
F
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
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 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
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