this kit ensures a uniform primary air-to-gas mixture across the entire burner tray

it can function with other spark modules utilizing 1/4" spade terminals

this open frame transformer provides the stable secondary voltage output required to drive contactors

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

Cleveland Controls DFS-221-156 Switch this kit ensures a uniformThe 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