Lochinvar & A.O. Smith 100113144 Switch 328140-751 it fits effectively into tight

it fits effectively into tight cabinet spaces typical of older residential and light commercial Carrier units

Reliable Actuation: Operates on a standard 24V circuit

When you are dealing with restricted flow or hunting issues on a service call

vibration-resistant placement

an open circuit during cool-down indicates a failed protector that requires replacement

Lochinvar & A.O. Smith 100113144 Switch 328140-751 it fits effectively into tightThe Lochinvar & A. O. Smith 100113144 Blower Prover Switch is a critical safety component designed for high efficiency water heaters and commercial boilers. As a direct OEM replacement for NS2 1333 01, this pressure switch (often referred to as an air pressure switch or draft prover switch) monitors the differential pressure created by the inducer motor. By verifying stable airflow, it ensures the sequence of operation proceeds to ignition safely.