Cleveland Controls AFS-227-121 SPDT Air Pressure Switch 0.05"-12" WC FM

The Cleveland Controls AFS-227-121 SPDT air pressure switch is used in monitoring and controlling the pressure in HVAC systems. This switch functions at a pressure ranging from 0.05" to 12" of the water column, ideal for a range of low-pressure services. The functions by detecting variations in the pressure of air within the system. In the case of high or low pressure, the switch is designed to change the electrical circuit due to the internal mechanism. This change in the electrical signal could then depend on which particular component of the HVAC it is used in, used to perform different control actions. It can be used to turn ON/OFF fans, open/close dampers, or trigger alarms.