this factory authorized part ensures a seamless electrical interface without the impedance issues common in aftermarket alternatives

high suction superheat

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

the bimetal disc inside the limit switch may have weakened

Manufactured to meet OEM electrical specifications

McDonnell & Miller AF-2 Switch Els PW 29614 this factory authorized part ensuresThe 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,