6 1/2" Length

ensuring OED burner performance remains within manufacturer specifications

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

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

eliminating the need for auxiliary relays in many setups

Lochinvar & A.O. Smith 100109846 Limit Switch 322838-753 6 1/2" LengthThe 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