Alittle of your knowldge

[keniff]

I don't think the valves open from backfeed iv never had it, I think maybe if you had 2 relays you could have it so if certain valves open then this would trigger the boiler and have seperate pump to trigger one relay so the pumps don't come on together

 

[i=p/u]

i think you have it their.... there was 2 relays in and the new guy said we only needed one.. so suppose many ways of doing it..

its all good learning for me