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Steam pressurerol setting

Everyone always says to set pressuretrol to 1.5 main and 1.0 subtractive differential . 99 percent of pressuretrols only go down to 2 .. is there an invisible setting ? If you put the screw down little below 2 are we at 1.5 or ??


  • JohnNY
    JohnNY Member Posts: 3,231
    Yeah, you have to sort of estimate where the 1.5 setting is. New pressuretrols have corrected this.
    Contact John "JohnNY" Cataneo, NYC Master Plumber, Lic 1784
    Consulting & Troubleshooting
    Heating in NYC or NJ.
  • Timco
    Timco Member Posts: 3,040
    Not all seem to like operating that low either. Some won’t reset or start back up reliably. You kind of have to try and watch them. Vaporstat and a 1-5lb gauge is an option.
    Just a guy running some pipes.
  • nicholas bonham-carter
    Some would say that a vaporstat and low pressure gauge are essential, otherwise it would be like having a 0-500 MPH speedometer in your car!—NBC
    delta TRomanGK_26986764589