Johnson Controls AFS-222 Sensing Switch the 19167 is the standard

the 19167 is the standard commercial equivalent to the MARS 67 and provides the same 420V coil rating and technical profiles

While a standard element wrench can be used

Engineered as a universal replacement relay

Common field issues include a blocked flue

which is essential for measuring suction line pressure drop across the element

Johnson Controls AFS-222 Sensing Switch the 19167 is the standardThe Johnson Controls AFS 222 Sensing Switch is the direct performance grade update for legacy A AFS222 and L 200 RH3 models. Engineered specifically for high demand HVACR and energy management applications, this differential air pressure switch features a versatile set point range of 0. 05" ? 0. 02" to 12. 0" w. c., making it ideal for monitoring positive, negative, or differential pressure across coils and filters. The unit is housed in a rugged zinc