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it is professionally recommended to strictly follow the manufacturer's wiring diagram to maintain the electrical integrity of the safety loop
Technicians should verify 24V at the relay coil
Built with industrial-grade relays and digital signal processing
eliminating the guesswork during field installation
Lochinvar & A.O. Smith 100113144 Switch 321894-709 it is professionally recommended toThe 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.
