Fig.4
High pressure system – Mains pressurised thermal store systems
(Fig.4)
The high pressure system MUST be fitted with a tempering valve (blender valve).
The appliance must be capable of raising the temperature of the incoming water to a
minimum of 55°C and delivering a flow rate of not less than 8 L/minute
A drop tight pressure reducing valve MUST be fitted if the supply pressures exceed 500kPa
(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).
Typical suitable
installations
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