Table of Contents
Advertisement
General requirements
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 in-
ternal soil and vent stack.
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
22
A
Condensate
drain
B
D
C
A
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
The return temperature must not be lower of
40 ˚C.
Copper tubing to BS EN 1057 is recommended for
water pipes. Jointing should be either with capil-
lary 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 release
valve, it should be ensured as far as possible that
the appliance heat exchanger is not a natural col-
lecting 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 pas-
sing 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 minimum
flow of 200--- 300 lts/hr through the main heat ex-
changer.
If you are installing a system that includes thermo-
static radiator valves (TRV) and/or small bore
F
(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.
Air release points
These must be fitted at all high points where air will
natural collect and must be sited to facilitate com-
plete filling of the system.
rev 17 09 93
Advertisement
Table of Contents
