Lochinvar & A.O. Smith 100113144 Switch 321894-709 ensuring stable in-shot burner combustion

ensuring stable in-shot burner combustion and maximum heat transfer

eliminating the guesswork during field installation

provided the connector matches

Technicians should verify 24V at the relay coil

Built with industrial-grade relays and digital signal processing

Lochinvar & A.O. Smith 100113144 Switch 321894-709 ensuring stable in-shot burner combustionThe 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.