the FUS0823 is the direct replacement for S8402-091

featuring a gold-flash contact coating to maintain signal integrity in low-current applications and a high-density footprint optimized for 4-inch snap track mounting

Is 28M97 compatible with all Lennox furnaces

designed to meet the same technical specifications

secure electrical terminal for quick field installation

Reznor 177633 Pressure Switch Els PW 17895 the FUS0823 is the directThe Reznor 177633 Pressure Switch is a critical OEM replacement part designed for precision monitoring within commercial gas heating systems. Engineered for unit heaters and duct furnaces, this combustion air pressure switch kit is factory calibrated to a 0. 50" W. C. setpoint (water column). The Reznor 177633 ensures safe ignition sequences and reliable venting verification by detecting proper differential pressure before allowing the gas valve to