Fig.5
(diagrammatic view
– not to scale)
c) Mains pressurised thermal store
systems (fig.4).
Packages of this type, fitted with a tempering
valve (blender valve) can be used. A drop tight
pressure reducing valve MUST be fitted if the
supply pressures exceed 5 bar running.
An expansion vessel (shown in fig.4) MUST be
fitted, and regularly maintained, to ensure the
unit is not damaged by excess pressures. This
may already be installed externally or internally
within the thermal store (check with thermal
store manufacturer).
d) Gravity fed systems (fig.5).
The shower control MUST be fed from a cold
water cistern and hot water cylinder providing
nominally equal pressures. There must be a
minimum of between 1 and 5 metres head of
water depending on the shower model. The
minimum head distance is measured from the
base of the cold water cistern to top of the
shower head.
NOTE: If installing the Exe model on a gravity
fed system, a pump must be fitted in the supply
pipework to the valve.
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