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differential wheel

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Dwayne B
Dwayne B Member Posts: 2
in THE MAIN WALL
In Dan's book on The Lost Art of Steam Heating he says to set cut in on a steam boiler to 1/2 psi and set the differential wheel to 1 psi. What is this diff wheel and where do I find it on my boiler. Is it the pressure gage?

Dwayne

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  • Jamie Hall
    Jamie Hall Member Posts: 23,426
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    It's one of the controls

    on the pressuretrol or vapourstat. Some of them are subtractive, some additive. You'll have to look and see which it is.
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
  • scrook_2
    scrook_2 Member Posts: 610
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    Honeywell P-trol

    If it's a common Honeywell PA404A pressuretrol then there's a wheel under its cover for differential (cut-in) adjustment and a screw adjust on top for cutout pressure. See the last page "settings" of:

    http://customer.honeywell.com/techlit/pdf/PackedLit/60-2341.pdf

    Shut off power to your boiler before removing the cover!
  • [Deleted User]
    [Deleted User] Posts: 0
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    in dan's 'we got steam heat',

    he details it on pgs 123-126
    Rem77
  • Dwayne B
    Dwayne B Member Posts: 2
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    Thanks to those who responded. It was under the hood of the pressuretrol and I have set it.

    Dwayne B
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