Description
The Cleveland Controls AFS-222-379C Air Flow Switch is a differential air pressure sensor that verifies airflow conditions before allowing equipment operation. It is commonly applied in furnaces, air handlers, and combustion systems where proving airflow is essential for safe and correct system sequencing. It operates by detecting pressure changes between two sensing points using an internal diaphragm and snap-action switch that changes electrical state when airflow reaches the set threshold. Integrated within HVAC systems, it connects to air sampling tubes and control circuits to confirm fan operation and support safety interlocks.
