Lochinvar & A.O. Smith 100278104 Switch 321702-401 Optimized Air-Fuel Mixture: Maintains the

Optimized Air-Fuel Mixture: Maintains the critical seal necessary to prevent vacuum leaks that can destabilize high-altitude or low-NOx burner performance

this auxiliary block is designed to snap directly onto standard Copeland 90A contactors and is the verified successor to the older 912-0001-17 series

How do I confirm if this bracket fits our specific York air handler

the R38071D182 conversion kit typically includes the necessary module and hardware required for the technical transition from HSI

Field Accessible: Features a hidden local access port for rapid system troubleshooting and configuration without removing the cover

Lochinvar & A.O. Smith 100278104 Switch 321702-401 Optimized Air-Fuel Mixture: Maintains theThe Lochinvar & A. O. Smith 100278104 Switch is a critical safety component designed for high performance hydronic and domestic hot water systems. This 100F manual reset limit switch acts as a primary thermal safeguard, effectively monitoring surface or water temperatures and interrupting the electrical circuit to the gas valve if the 100 degree Fahrenheit threshold is exceeded. Engineering for reliability, this manual reset high limit switch prevents