Pipework Connections - Benchmark mCHP BoilerMate Design, Installation And Servicing Instructions

5.0 INSTALLATION AND WIRING
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FIG 5.3
Fig 5.4
5.3
PIPEWORK CONNECTION
(a) The position of the pipework connections is shown
opposite in figures 5.3 and 5.4 and the connection
sizes and dimensions are shown in figure 3.2a,
section 3.2b, section 3. All connections are also
labelled on the appliance. It is essential that the
pipework is connected to the correct connection.
(b) If using pushfit connections with the flexible
hose kits, it is important to check that they are
compatible. Written approvals have already been
obtained for: -
• Hepworth – Hep O BiTite
2
• John Guest – Speedfit
• Yorkshire – Tectite
However similar assurances cannot be obtained
for Polypipe fittings and therefore we can not
recommend their use.
(d) All factory made joints should be checked after
installation in case they have been loosened during
transit.
(e) The fittings for the feed and expansion cistern
should be installed following the instructions
provided by the manufacturer in a position to
suit the particular location and the cistern fitted
on its support base. The cold feed/expansion and
safety open vent should be installed between the
appliance and the feed and the expansion cistern.
(f ) It is normally envisaged that the feed and expansion
cistern will be located in the same cupboard as
the BoilerMate itself to maintain dry roof space.
However if it is necessary to locate the cistern in
the roof space (or on a higher floor) the cold feed/
open vent pipework and the cistern will need to be
adequately insulated and protected against frost
damage.
(g) No valves should be fitted in the safety open vent
which must be a minimum of 22mm copper pipe
or equivalent.
(h) The overflow/warning pipe shall have a continuous
fall, be fitted to discharge clear of the building and
be sited so that any overflow can be easily observed.
It shall also be installed in a size and material
suitable for use with heating feed and expansion
cisterns in accordance with BS 5449 and should not
have any other connections to it.
(i) NOTE: Combined feed and open vent pipe
arrangement must not be used.
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