Hi
Well the subject says most of it really :) I currently have a 2 zone (CH & HW) Y Plan system and am looking for electrical circuit layouts to extend this into a 3 zone system (CH, HW & Heat Exchanger for swimming pool).
I am looking to keep the existing mid position valve, and add another mid position valve in the 'feed' to the existing mid position valve. Now I know that makes my electrics more complicated, as I can't go to a relatively simple 'S Plan Plus' system, but it make my plumbing a lot easier.
Whilst I would like to go to a 'fully functioning' system with all 3 zones and combinations of those zones available, a simpler circuit that simply turned on swimming pool pump, boiler and mid position valve to 'Heat Exchanger only), at the expense of ignoring any demand from the CH or HW systems would be fine.
I have spent some time searching this group and google, finding the odd comment about 'it gets complicated', but never finding answers. With the number of people installing swimming pools, and the number of Y plan systems out there - many people must have done this before?
Thanks in advance Kevin