In message , Roger Mills
writes
In an earlier contribution to this discussion,
geoff wrote:

In message , Roger Mills
writes
In an earlier contribution to this discussion,
Dave Osborne wrote:


Well, I'd be willing to bet that there are many millions of systems
out there wired to a classic Sundial plan. Mine is, for one... :-)

However, I'm quite happy to do additional drawings for more modern
installation arrangements.


From my limited reading, the following ideas come to mind:-

1. Wiring diagram for S-plus with one and two extra heating zones.

Yes - good idea.


2. Conventional (i.e. not system) boiler with pump-overrun timer (as
you have suggested above).

Yes - although it's not necessarily a *timer* per se. My boiler
simply keeps the pump running until the output temperature falls
below the boiler stat setting.

What boiler is that ?

It's a Mk I Baxi Solo powered flue jobby - c1990 vintage.

Ah - simply switched from the stat then, the solo2 the pump overrun
would be time, not temp controlled


--
geoff