Cleveland Controls AFS-298-391 Sensing Switch 321702-401 look for bulging or leaking

look for bulging or leaking casing on the old unit

Rugged Construction: Utilizing stainless steel bellows ensures resistance to vibration and long-term fatigue in high-pressure environments up to 245 psig MWP

which allows acidic water to bypass the seal and drip onto the furnace floor or inducer

Most OEM fan blades come with the necessary integrated hub for a 7/8-inch shaft

this SPST (Single Pole Single Throw) switch ensures the combustion blower is moving sufficient air to safely vent flue gases before the ignition sequence initiates

Cleveland Controls AFS-298-391 Sensing Switch 321702-401 look for bulging or leakingThe Cleveland Controls AFS 298 391 is a high performance air pressure sensing switch designed for precision in commercial HVAC and energy management systems. Engineered as a general purpose differential pressure switch, it monitors positive, negative, or vacuum air pressure with a field adjustable set point range from 0. 05" w. c. to 12. 0" w. c. This unit is factory calibrated to change contacts on increasing pressure at 0. 30" w. c. ( 0. 02" w. c.),