In an earlier contribution to this discussion,
Ed Sirett wrote:

On Wed, 16 Nov 2005 01:56:33 +0000, Fatboise wrote:


I have 5 motorised valves in my house and want the fifth motorised to
switch on when all four of the other motorised valves switch off, if
one of the four motorised valves is on the fifth motorised valve must
remain closed.

Any suggestions appreciated............I'm thinking of smoe sort of
relay??

I suspect that you might be looking for an automatic bypass?

If you are seriously lucky all the 4 valves might have the white wire
as Set Square mentioned.


If the 5th valve *is* to provide a by-pass on an S-Plan-Plus system, then
using an automatic by-pass valve instead would indeed be the way to go. In
this situation, the volt-free contacts on the first 4 valves would already
be in use (as I indicated) and would not be available for switching the 5th
valve without additional relays.

He didn't actually say what any of the valves were used for - so I gave a
generic answer - but I suspect that it *is* a central heating system!
--
Cheers,
Set Square
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