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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 ??


  • JohnNYJohnNY Member Posts: 2,369
    Yeah, you have to sort of estimate where the 1.5 setting is. New pressuretrols have corrected this.
    For installations, troubleshooting, and private consulting services, find John "JohnNY" Cataneo here at :
    "72°F Mechanical, LLC"
    Or email John at [email protected]
    John is the Boilers and Hydronic Heating Systems Course Instructor at NYC's Mechanics Institute, a professional Master Plumber, licensed by The Department of Buildings of The City of New York, and works extensively in NYC while consulting for clients in and out of state.
    John also oversees mechanical installations and maintenance for metro-area clients with his family's company, Gateway Plumbing and Heating along with his brother/business partner.
  • TimcoTimco Member Posts: 2,938
    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.
    Technical Support Manager, HTP Comfort Solutions.
  • 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
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