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PA404

dk_4
dk_4 Member Posts: 4
in THE MAIN WALL
Is it the 1# face to me, or the 1 # align to the side mark?

dk

Comments

  • dk_4
    dk_4 Member Posts: 4
    PA404

    I would like to ask how do I set the differential wheel of PA404 to 1 psi? the dial # face to me or face to the left side, asuuming standing in front of the Pressuretrol. thanks in advance.

    dk

  • Big Ed
    Big Ed Member Posts: 1,117


    The cut-in is on the face. Set the cut in to .5 using the screw on top and in the inside under the cover there is a wheel . The wheel is the differential , cut -in + Diff. = cut-out . in a normal home or small building you would set the diff to 1# , yes this will give u 1.5# lowest setting on a P404
  • ed wallace
    ed wallace Member Posts: 1,613
    pa404

    the number on the wheel facing you

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  • DanHolohan
    DanHolohan Member, Moderator, Administrator Posts: 16,600
    And then it will still

    make 4 psi. ;-)
    Retired and loving it.
  • Dale
    Dale Member Posts: 1,317
    404

    If its a heating boiler the PA404 "A" model is the one. To set the differential remove the cover and turn the wheel to align with the mark. As the others said set the outside cut in to as low as it will go.
  • btc
    btc Member Posts: 43


    My PA404 doesnt use a wheel--cut in and differential are each adjusted via screws on top. Also, the scale plate for each can be moved up an down about 1/4 inch--how do I figure out what right settings are? PS. My PA404 is about 50 yrs old...
  • superMARKet
    superMARKet Member Posts: 87
    Ain't that the truth. Recommend a better control?

    I made 3.5-4.75psi with my old PA404.
    I make 3-4psi with my new PA404.

    Both were set to 0.5+1.

    What do I do? L404? Vaporstat?

    Mark
  • scrook_2
    scrook_2 Member Posts: 610
    Not an L404A?

    (vs. PA404A) also honeywell, w/ two top adj screws, diff (subtractive) and main (cutout) scale on the front and a mercury switch?
  • Dick_2
    Dick_2 Member Posts: 14
    using a manometer

    attached to the boiler drain in accordance with Noel's instructions, I found that in order to have the vaporstat cut out at 8 ounces of pressure, the dial setting had to be lowered to about 5.5 ounces of pressure. There is no doubt that lower is better. Cut in dial seems to be okay.
  • btc
    btc Member Posts: 43


    Nope. It reads PA404A1X05 on the casing. It does have mercury float. Scale is from 0-5 psi on cut in and 0-6 psi on differential...
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