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pressuretrol on burnham V9a

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lilzane
lilzane Member Posts: 12
in Thermostats and Controls
hello my Burnham v9a has two pressuretrol boxes on it, would like to know where setttings should be. pressuretrol on left has diff @ 2.5psi and main @ 5psi. right pressuretrol only has main which is set @ 7psi

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  • Jamie Hall
    Jamie Hall Member Posts: 26,212
    Try...

    changing the left one to a differential of 1 psi and a cutin of 0.5 psi if it is additive, or a cutout of 1.5 psi if it is subtractive.  Leave the other one at 7.
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
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