Adding multiway switching to a boiler ...

Nice diagram. Same as my words (y)

I’ve actually lived in a house through these various stages, so have a lot of real live experience of it.
 
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Can you comment on my overlay of your diagram onto the Finder 40.31 Relay (230v, 1 pole, 10A) and 95.03 Socket Bernard suggested?
 
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Can you comment on my overlay of your diagram onto the Finder 40.31 Relay (230v, 1 pole, 10A) and 95.03 Socket Bernard suggested?
Is this what you mean? ....

upload_2019-5-7_16-29-35.png


Kind Regards, John
 
Yes - thanks John - just wanted to confirm I had understood it correctly.
 
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Yep - just spotted that error in my haste!
 

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You have all been brilliant - thank you - going to get some parts ordered and do some testing.
Will feed back with results!
 
Yes - there is an ancient honeywell thermostat sitting ahead of the CH pump. I have left it in place for now and set it to it's highest to keep it open and allow my smart therm to always be able to call for CH uninterrupted.
 

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