I could use some assistance on the wiring of FB-7 relay.
I haven't worked on Oil Heat in 15 years, but remembered this relay that mounts on Hot Water heater. What it does is it is wired if the Boiler & Hot Water Heater try to come on at the same time it lets the Hot water Heater fire, otherwise the Heater locks out and has to be reset. This is with one oil line from the tank and teed off at the boiler. Thanks for any help.