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General Requirements
When the vessel is connected the system should be pressurised when cold. If the initial system
water pressure is too high, the diaphragm will be displaced too far into the vessel. This will leave the
vessel unable to accommodate the volume of expansion water. The result of this is an increase in
system pressure and the safety valve will lift.
Primary Coil Connections
The primary circuit can be open vented or sealed, with up to a maximum pressure of 3.5 bar. If you
heat sources such as some AGA’s, back boilers, solid fuel stoves, etc. are not suitable. Please con -
Installing The Two Port Motorised Valve
The function of the Two Port Motorised Valve prevents the cylinder from overheating. It can be in -
stalled on either horizontal or vertical pipework.
marked on the body of the valve with arrows.
Thermostatic Mixer
mixing valve should be installed. Its function is to act as an anti scald protection. The thermostatic
Secondary Circulation
in 15mm pipe. A suitable WRAS approved stainless steel or bronze circulation pump must be used.
vessel into the circuit to accommodate the increased system water volume. Secondary circulation
should be noted that the use of a secondary circulation circuit can increase running costs as there
energy losses to a minimum.
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