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steam pressure control switch

you shouldn't see any pressure at all. A properly functioning system will circulate steam on a few ounces pressure, which will not register on that gauge.

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  • bobm
    bobm Member Posts: 2
    problem with steam pressure control switch

    I replaced the PCS on a steam furnace and now get no pressure to the unit. The pigtail is clean, the pressure gauge works (when I blow into it I get a reading), and i cannot figure out teh problem. when I remove the pigtail from the low water control unit, water bubbles up from the hole, so there is definietly pressure to the pigtail inlet.
    all the pipes in the assembly have been emoved and checked for blockages, and reasembled with each joint checked for leakage. The asembly is air tight yet still no presuure reading on the gauge, and the furnace does not kick on.
    help, please
  • bobm
    bobm Member Posts: 2

    thanks for the reply,

    yes, it is a 0-30 psi gauge. It was reading 8lbs prior to removing the old pressure control switch. the min cut-off pressure on the switch is (i think) .5psi. with the cutoff set to min the furnace still will not kick on.
  • Jamie Hall
    Jamie Hall Member Posts: 23,313
    There are a lot of reasons

    besides the pressure switch that a boiler won't start -- and some of them are there to save your life. Some boilers have a manual reset low water cutout (usually larger ones). Does yours? Did the water ever get low enough to trip it? Is the water high enough now to be safe? If so, try resetting that. Then... is the burner and controls getting power? (Don't laugh, it happens -- a lot). If not, why not? If there is an automatic low water cutout, is it perhaps sludged up and not working? And so on...
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
  • Steamhead (in transit)
    Some Pressuretrols

    are not that accurate. Try turning it up slightly and see if it starts.

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