or use both for multi-stage heating or cooling

ensuring consistent airflow in commercial HVAC applications

If the coil is showing signs of burn-out or electrical failure

which is critical for matching the manufacturer's safety specifications for the 300-series units

Integrated Safety: Built-in electronic stall protection stops the motor automatically if an obstruction is detected

Cleveland Controls AFS-951-1 Switch 30067439-890 or use both for multi-stageThe Cleveland Controls AFS 951 1 is a professional grade air pressure sensing switch engineered for high accuracy performance in industrial and commercial HVACR applications. Designed with a broad 0. 05" to 12" WC set point range, this SPDT differential pressure switch provides exceptional versatility for monitoring positive, negative, or differential pressure across blower coils, filters, and combustion air systems. Housed in a rugged NEMA 4