As many of you will know, I have posted many times about Y-Plan systems and
have (hopefully) helped a few people to diagnose problems with them.

Until recently, I hadn't really studied W-Plan systems (which have a
diverter valve rather than a mid-position valve). However, the subject has
recently arisen in another thread.

Looking at the W-Plan wiring diagram in
http://content.honeywell.com/uk/homes/systems.htm it looks to me as if you
can't have CH until HW is satisfied - even if HW is turned off at the
programmer - because the valve is driven to the CH position by a feed from
the cyl stat's satisfied contact.

Is that the way it's meant to operate? Seems a bid odd to me!

Wouldn't it make sense to have a HW-OFF wire from the programmer (like
Y-Plan does) connected to 5 in the junction box? You could then have CH only
if you specifically didn't want HW.
--
Cheers,
Set Square
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