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Boiler Pressure Controls


Terminology
  1. Operating limit control: Turns the boiler on when required, and off when satisfied.
    1. ​Setpoint: Slightly above the highest desired steam pressure, but at least 10% lower than safety valve setting
  2. High limit control: Used as a safety limit to turn the burner off in case of operating limit control failure. Requires manual reset.
    1. Setpoint: approximately 10psi above operating limit if feasible. Alternatively, set midway between operating limit and relief valve setting. 
  3. Modulating control: Monitors changes in pressure and signals the modulating motor to increase or decrease firing rate as needed.
    1. Setpoint: Depends based on the end-user's desired steam pressure, but must be set so that the mod motor returns to low fire before the operating limit control opens. Set its low point below the cut-in setting of the limit control to allow the burner to briefly operate in low fire on each start rather than immediately driving to high fire.
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This information is for reference only.
  • Home
  • Boiler Data
    • Cleaver-Brooks >
      • CB Model
      • PS & PSM Model
  • Burner Data
    • Beckett
    • Cleaver-Brooks
    • Gordon-Piatt >
      • Gordon Piatt F16
    • Industrial Combustion
    • Iron Fireman
    • Johnston
    • Kewanee
    • Limpsfield
    • Oilon
    • Powerflame
    • ST Johnson
    • Webster
    • York-Shipley
  • Parts Data
    • Apollo
    • Clark-Reliance
    • Conbraco
    • Crane Valves
    • Davis Valves
    • Gauges
    • Goulds
    • Grundfos
    • Honeywell
    • Magnatrol
    • Maxon
    • McDonnell & Miller
    • Mercoid
    • Pipe, Hose & Fittings
    • Powell Valves
    • Siemens >
      • Siemens 353
      • Siemens Control Valves
      • Siemens LMV
      • Siemens Logo
    • Transmitters
    • United Brass Works
    • Vogt Valves
    • Warren
    • Warrick
    • Watson McDaniel
  • Videos
  • New Page