47 inches water column and resets around 0

an open-low action like the P100AC-2 is typically used as a low pressure cutout to prevent compressor operation during loss of charge or as a condenser fan cycling control to maintain head pressure

In the Maxitrol technical catalog

This electronic component is built to withstand the cycling demands of industrial air heaters

It is rated for a Maximum Working Pressure (MWP) of 500 psig and a Maximum Operating Pressure Differential (MOPD) of 300 psig

Utica-Dunkirk 550002258 Pressure Switch Els PW 17895 47 inches water column andThe Utica Dunkirk 550002258 Pressure Switch is a critical safety component designed for precise combustion air monitoring in high efficiency gas furnaces and boilers. This SPDT air pressure switch is factory calibrated to a 0. 4" WC set point, ensuring the inducer motor generates sufficient static pressure before allowing the ignition sequence to proceed. It features a standard 1 4" barbed connection for secure pneumatic tubing attachment and provides