The single-try ignition sequence simplifies local code compliance in specific commercial and residential configurations

ensuring OED burner performance remains within manufacturer specifications

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

If the control board signals a "stuck open" fault

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

Lochinvar & A.O. Smith 100109846 Limit Switch 322838-753 The single-try ignition sequence simplifiesThe 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