8
Fig. 4C
Fig. 4B
Fig. 4D
3.11.2 ALTERNATIVE CLOSE-COUPLED AR-
RANGEMENT
If necessary or if preferred, a close-coupled arrange-
ment for the feed and expansion pipe work can be used
as an alternative to a combined feed and vent pipe. The
confi guration of the close-coupled pipe work shall be as
shown in fi gure 4B.
NOTE
● The distance between the cold feed pipe and the safety
vent pipe shall be no more than 150mm
● The cold feed pipe must be inverted as shown in fi gure
4B
● The safety vent pipe must be 22mm in diameter
● The cold feed pipe must be 15mm diameter
● The cold feed pipe and safety vent pipe must both rise
continuously and be unrestricted.
● The minimum distance from the top of the boiler to the
bottom of the F&E tank shall be no less than 1-metre,
whilst the maximum distance shall be no greater than
30-metres.
● The distance between the bottom of the F&E tank and
the highest point of the safety vent pipe must be no
less than 500mm.
The supply of water to the F&E tank should be taken from
the mains water supply via a suitable fl oat operated valve,
whilst the supply from the F&E tank to the boiler/heating
circuit (via the cold feed pipe) shall be unrestricted.
3.11.3 REMOTE CONNECTION
It’s permissible to connect the feed and vent pipe work
remote from the boiler, providing it’s connected to the
primary heating pipe work as shown in fi gures 4C/4D.
NOTE
The instructions for a combined feed and vent instal-
lation (3.11.1) or close-coupled arrangement (3.11.2)
still apply when connecting the feed and vent pipe
work remote from the appliance.
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