The High Limit Option Card adds a second, adjustable temperature limit to the boiler, and will shut the boiler down if temperature exceeds the setting of the card. High Limit Option Cards also offer additional protection for low temperature heating systems such as in-floor radiant zones, and systems containing radiators situated within the living areas of the building. Boilers are sometimes required to be equipped with Auxiliary High Limits by local building codes.

  • Protect Boiler & Heating System From Damage Due to High Water Temperatures
  • Limit Rated Control
  • UL 353, and CSA22.2 Certified for CSD-1 Code Compliance (manual reset model)
  • Ideal for Heating Systems with Plastic PEX Tubing, and Low Temperature Radiation
  • Adjustable Set Point and Differential
  • Designed U.S. Boiler Co. for Use with the IQ Control System
  • Simple Plug and Play Installation - Saves Time and Simplifies Field Wiring
  • Includes 1/2" Thermo Well & Probe w/36" Lead for Remote Mounting in Supply Piping
  • Single Plug-In Molex Connection to Option Card
  • Settings, Status & Diagnostic Codes Displayed on Option Panel
  • LED Read-Out Displays for Simple Set-Up and Troubleshooting
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