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A week or so ago there was a question about settings on the Pressuretrol. Here's the answer from the Honeywell product manager: "The correct setting and wiring is determined by the boiler OEM not Honeywell. It would also depend a lot on what OS # they have installed as some are subtractive differentials and some are additive. Since we dont know how the two are wired into the control system you cannot tell which one is in command and which one is the backup."