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Pressure gauge (sealed system only)
A pressure gauge with a set pointer and cov-
ering at least 0 to 4 bar (0 to 60 lb/in) shall be
fitted permanently to the system in a position
where it can be seen when filling the system.
Water Makeup (sealed system only)
Provision should be made for replacing water
loss from the system using a make up bottle
mounted in a position higher than the top point
of the system, connected through a non-return
valve to the return side of either the heating
circuit or the hot water cylinder.
Alternatively, provision for make up can be
made using a filling loop.
In an open vent system this function is under-
taken by the ball valve in the feed and expan-
sion tank, it is important that this is correctly
installed and maintained.
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.
Filling (sealed system only)
A method for initially filling the system and
replacing water lost during servicing must be
provided and it must comply with local water
authority regulations.
The correct method is shown in Fig. 5.8.
The temporary connection must be removed
immediately after filling.
Supply pipe
(cold water inlet)
Fig. 5.8
The installer should ensure that no leaks ex-
ist either inside the boiler or on the system as
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GENERAL REQUIREMENTS
Control valve
Double check valve
Temporary
connection
Control valve
C.H. return pipe
frequent filling of the system could cause pre-
mature scaling of the heat exchanger.
5.9
Water treatment
C.H. circuit
Where a new boiler is fitted to a new system
with either plastic or copper pipes, it is impor-
tant the system is fully flushed, on completion,
to ensure flux residues, swarf, oils and other
installation debris is removed.
Where a new boiler is fitted to an existing sys-
tem, it is important the debris from the existing
system is fully removed in order to ensure the
efficiency of the new appliance is maintained.
Details on flushing procedure are given in the
section "Initial filling of the system" on page
56 of this manual.
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