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Beckett Heat Manager install on Williamson GWA2 boiler
I'm trying to install an Intellicon HW+ 3250 on a Williamson GWA2 hot water heating boiler. The 115v and 20v wiring looks straightforward enough for me but the red & yellow wires to interrupt the burner is not clear to me. Can someone advise on how and where I should connect the red and yellow on the boiler? Pictures attached include the wiring diagrams. Thank you in advance.