Just thought I would pass this one on, for all those of you who working on the various articles and diagrams related to the CH controls and zoning articles:
Another John wrote:
"I just wanted to say that having a combi heated two zone heating system which did not work at all as it should, I was completely at sea.... (I have a plumber whose pipework is worthy of polishing and lacquering for the public to marvel upon- but his electrical skills are not)..
Anyway- I stumbled across your wiring diagrams using Honeywell 2 port zone valves etc.
After a good read and a check at the birds nest of wiring I was left with all became clear- I took a deep breath and re wired following your illustration of how a system like mine is supposed to operate.
It worked a treat and my central heating is now up and each zone is running as it should.
Thank you very much-your site is now in my favourite folder."