Doctor Drivel wrote:

Each valve has a microswitch which closes when the valve is fully open. A
permanent live should run through "each" of these and to the the boiler.
The boiler should not fire if any of these are closed.

To clarify, he means "each in parallel" and not "each in serise". i.e.
only when all are open is the "call for heat" removed from the boiler.
(If the boiler has a call for heat input it is better to use this than
simply using its power connection, since that will let the boiler run
the pump for a while after turning off the burner).

The kichen stat energises the kitchen valve. The cylinder stat energises
the DHW valve.

And the stats in each zone ought to energise those valves.


--
Cheers,

John.

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