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pressuretrol settings

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jim_110
jim_110 Member Posts: 24
in THE MAIN WALL
5 pounds is excessive. I would set your main at 1 1/2 and subtractive differential at 0 or .5 and see how the system responds.When a call for heat occurs out of setback ,time the first cycle and if you get multiple short cycles at the end to satisfy the stat let us know the # of cycles.

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  • LARRY_32
    LARRY_32 Member Posts: 9
    PRESSURETROL SETTINGS

    Had a new Burnham V84 oil boiler installed as replacement in a single 2" main steam line house. Had problems with excessive "short cycling" and final attempt to correct was to replace the initial Pressuretrol with a Honeywell L404F unit. Service person set the Differential to 5psi and the Main to 5psi . Short cycling appears to have been reduced.
    Question is whether the settings are too high; I thought that settings should be 2.5 and 0. for sgl family house.
    Any risk or potential problems with higher settings? Thx for any help/advice.
  • Dan_29
    Dan_29 Member Posts: 111
    pressuretrol settings

    I remember someone on this page saying that the Empire State building is heated by steam at 5 psi. It sounds like your tech just cranked up the pressure and did not solve the real problem. Click on "steam problems" at the top of this page. It could be a number to things --radiator venting, line venting, or plugged pigtail, etc.

    .5 cut-in 1.5 cutout is the standard pressuretrol setting, anything more wastes fuel. At 15lbs psi the presuure relief valve will blow according to the tag on my boiler.

    Dan
  • carol_3
    carol_3 Member Posts: 397


    The product specialist at Honeywell says L404 is a commercial control and also mentioned the Empire State Building for the 5psi.

    He says that the typical home uses a PA404, usually set them in the 1-2psi range and set the differential as small as possible (1-5psi diff most models).
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