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Drayton
Mid-position control system
In a fully pumped system the boiler provides a common supply
of heated water which is fed to the motorised valve by the
pump. The mid-position valve has three positions of operation,
these depend on demand from the thermostats.
In 'mid-position' the valve directs the flow of heated water
to both heating and hot water circuits. Should either thermostat
become satisfied, the valve will move leaving only the heating
or the hot water port open. The boiler and pump will continue
running whilst there is a demand from one or both thermostats.
If both thermostats become satisfied the pump and boiler will
switch off to save fuel.
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