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In article ,
(robf) writes:
I had always assumed that when I manually opened one of these valves
that the 'boiler ON' microswitch was activated.

I seem to remember manually driving my old heating system that way
once.

Looking at ones I have fitted now seems that the manual lever DOESNT
move the cam far enough to close the switch.

I guess when the motor controls it, it will.

The ones I've come across, the manual lever always leaves it
in the mid-position (for a mid-position valve).

--
Andrew Gabriel