13
4.8.5
Draining tap
These must be located in accessible positions
to permit the draining of the whole system.
The taps must be at least 15 mm nominal size
and manufactured in accordance with BS 2870
1980.
4.8.6
Air release points
These must be fitted at all high points where
air will naturally collect, and must be sited to
facilitate complete filling of the system.
4.8.7
The appliance has an integral sealed expansion
vessel to accommodate the increase of water
volume when the system is heated.
It can accept up to 6 Its of expansion water.
If the appliance is connected to a system with
an unusually high water content, calculate
the total expansion and add additional sealed
expansion capacity as appropriate (Fig. 7).
In general, modern systems will present no
problem.
4.8.8
Mains water feed: central heating
There must be no direct connection to the
mains water supply, even through a non return
valve, without the approval of the Local Water
Authority.
Fig. 9
Fig. 7
Fig. 10
Fig. 8
PERMISSIBLE METHOD OF FILLING
Fig. 8 depicts the requirements of diagram
R24.2a of Water Supply (Water Fittings)
regulations 1999.
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