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Is there a more accurate Pressuretrol?

Bodycount Member Posts: 39
edited September 2022 in Strictly Steam

I have this style / model Honeywell Pressuretrol. 

If I engage the adjustment screw approximately 1 turn or less so it doesn’t pull out, the pressure will reach 4.5 psi. 

If I disengage the screw so it’s at its lowest setting (basically deactivated) it will reach 1.5 psi. 

The diff is at 1. 

I’d like to replace the unit with a more accurate unit so I can keep it at 0.5-1 psi. 

Thanks in advance. 



  • mattmia2
    mattmia2 Member Posts: 9,970
    Vaporstat. Put it in series with the pressuretrol so the pressuretrol acts as a backup.
  • 109A_5
    109A_5 Member Posts: 1,388
    Hello @Bodycount,

    As @mattmia2 stated a Vaporstat 16 Oz and less, is probably the most common addition. If you are tripping out with pressure you may want to add a delay timer too. Also Dwyer makes a variety of low pressure switching devices.

    I played with my Pressuretrol a bit since I read some folks just removed the spring, but that may have created erratic cycling, so I did this, an easy modification. Come to find out, in my case the EDR is greater than the boiler rating so my system never makes pressure more than a few inches of water column. So my Pressuretrol is just a safety device.

    National - U.S. Gas Boiler 45+ Years Old
    Steam 300 SQ. FT. - EDR 347
    One Pipe System
  • ethicalpaul
    ethicalpaul Member Posts: 5,798
    As it ideally should be!

    NJ Steam Homeowner.
    Free NJ and remote steam advice: https://heatinghelp.com/find-a-contractor/detail/new-jersey-steam-help/
    See my sight glass boiler videos: https://bit.ly/3sZW1el