the bimetal disc inside the limit switch may have weakened

verify the gas valve model number and serial plate before beginning the conversion

it features 45+5 microfarad capacitance to handle heavy start-up loads while maintaining stable running currents in PSC motors

For professional fire safety in medium-width ventilation runs

McDonnell & Miller AF-2 Switch Els PW 29614 the bimetal disc inside theThe McDonnell & Miller AF 2 Air Flow Switch (Part Number 123200) is a specialized low velocity air flow switch engineered to prove fan operation and monitor airflow in critical HVACR systems. Built for durability, this field proven unit features brass, steel, and aluminum construction, making it ideal for standard commercial and industrial duct environments. The integrated snap acting SPDT switch provides reliable signaling for interlocking blowers,