Benchmark PulsaCoil 2000 Series Design, Installation And Servicing Instructions page 16

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2.0INSTALLATION
2.2 INSTALLATION
It is normally envisaged that the feed and
expansion cistern will be located in the same
cupboard as the PulsaCoil 2000 appliance
itself to maintain a dry roof space.
The cold feed/open vent pipework assembly
(as supplied) should be used if it is intended
to install the F & E cistern directly on top
of the appliance.
However, if it is necessary to locate the
cistern in the roof space (or on a higher
floor) the cold feed/open vent pipework
assembly (as supplied) should be used to
connect to the F & E cistern and pipework
site run by the installler to connect this to
the appliance.
Obviously, any pipework in the roof space
and the feed and expansion cistern will
need to be adequately insulated to protect
against frost damage.
Combined feed and open vent pipe
arrangements must not be used.
No valves should be fitted in the safety
open vent which must be a minimum of
22mm copper pipe or equivalent.
The mains cold water supply to the ballvalve
shall be provided with a suitable servicing
valve.
The overflow/warning pipe (if provided)
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 (e.g 22mm copper) and should
not have any other connections to it.
Note: If a warning/overflow pipe is NOT
provided the F & E cistern should be
filled from a temporary hose connection
supplied from any cold water tap or
from a permanent cold branch provided
adjacent to the F & E cistern. The
temporary hose must be fitted with a
double check valve and removed once
the appliance is filled.
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