In an earlier contribution to this discussion,
fred wrote:

In article , Army
writes

I wonder if anyone could confirm (or not) that I'm barking up the
right tree here. The bit I need further information on is the
wiring. Does anyone have any good pointers to where I may learn
about this?

In case you were in any doubt, the advice of Mr Square, supported by
Mr Lurch is sound, the other is er, not :-).

Indeed, in my post of 5:16pm on 1st October, I gave a reference to a
Honeywell site showing various heating plans with their associated wiring
diagrams, and explained that and S-Plan arrangement would be best - but also
explained how a Y-Plan could be adapted to suit the OP's needs if he really
wants to use a 3-port valve.

This information should be sufficient to enable any competent DIY-er to sort
out the wiring.
--
Cheers,
Set Square
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