Series GRFS Gas Pressure Sensing Switches are compact, economical switches specifically designed for use with gas furnaces, package burners and other fuel-burning equipment. They are suitable for use with natural, manufactured or LP gas.

Models are available with field adjustable set point ranges or nonadjustable set points. The standard adjustment ranges available for a GRFS-4000 Adjustable Set Point Switch are 0.18±0.05″ wc to
2.0″wc, 5″wc, 10″wc, 12″wc, or 20″wc. The set point of a GRFS-4000 Non-Adjustable Set Point Switch is 0.18±0.05″wc with a switching differential of 0.05±0.02″ wc.