Always verify the appliance nameplate and use a digital manometer for final calibration

High-Temperature Calibration: The 290°F trip point provides a reliable safety threshold for high-tolerance residential and commercial water heating applications

including the Axiom

Verify the color coding (Red/Red) and the fixed temperature rating (190°F) against your furnace's service manual

Designed for seamless compatibility with Johnson Controls V-3000 series actuators with a 5/16" stroke

Cleveland Controls DFS-221-156 Switch Always verify the appliance nameplateThe Cleveland Controls DFS 221 156 is a heavy duty, fixed point air pressure sensing switch engineered for precision airflow verification in HVAC, duct heater, and combustion systems. As a direct FS BO 179 cross reference, this SPDT switch is factory calibrated to actuate on a pressure rise of 0. 05" w. c. (+ 0. 02"), making it a critical safety component for proving draft in boilers and furnaces. Its open mounted design is specifically optimized for