Port A must be designated as the inlet to maintain the equal percentage flow characteristic

this unit requires a 460V 3-phase input to provide the necessary output for industrial motor control applications

ensuring the B1809904S ignition control remains stable under variable line voltage conditions

Direct OEM Replacement: Ensures exact compatibility with Lochinvar and A

eliminating the need for auxiliary relays in many setups

Lochinvar & A.O. Smith 100109846 Limit Switch 322838-753 Port A must be designatedThe Lochinvar & A. O. Smith 100109846 is a 90 150F M R limit switch engineered for high precision thermal protection in residential and commercial water heating systems. As a critical safety component, this manual reset thermostat monitors air or water temperature to prevent overheating conditions that can lead to equipment failure or hazardous operation. It is specifically designed for cross brand compatibility, serving as a direct replacement part