"TheOldFellow" wrote in message
. ..
I'm about to wire up an extra CH zone, the thermostat will call the
valve, and the valve's auxiliary switch will call the heating system.

However I find that the system is wired using an Honeywell 42005748-001
wiring centre. This appears to have no provision for a second (third
etc) zone.

http://www.uk-plumbing.com/brochure/...Centre4200.pdf

Does anyone know how to wire the zone into such a wiring centre? This
photo shows how it is currently wired:

http://bit.ly/6Iv5Lg

If I just connect it to the roomstat terminals in parallel with the
existing roomstat this will also call the main S plan zone valve.

If this is too complicated, I may just replace the wiring centre with a
10-way junction strip. I'll want to add more zones as I go through the
renovations.


If you are not adding an extra programmer and are just zoning the heating
using room stats then wire up the new 2 port valve and the new room stat in
parallel with the existing CH 2 port valve and roomstat with just one small
alteration.

The alteration is. The return/call from the new room stat should be
connected to the BROWN wire on the new 2 port valve and these two wires
should not be connected to anything else. A piece of strip connector should
be fine for this connection

Adam

Adam