Lochinvar & A.O. Smith 100074280 Limit Switch 319848-301 streamlining the footprint within the

streamlining the footprint within the cabinet

and inducer motor timing

This Modine unit heater motor features a 5-inch diameter casing and is typically mounted via four studs on the shaft end (4-5/8" bolt circle)

The integrated visual indicator and junction box (NEMA 1 enclosure) allow for immediate status verification and simplified electrical installation

Lochinvar & A.O. Smith 100074280 Limit Switch 319848-301 streamlining the footprint within theThe Lochinvar & A. O. Smith 100074280 High Limit Switch is a critical safety component engineered to provide thermal protection in high efficiency heating systems. Designed as a genuine OEM replacement part, this switch monitors the internal temperature of the heat exchanger or burner door to prevent unsafe operating conditions. If temperatures exceed the factory defined safety threshold, the 100074280 triggers an immediate system lockout to mitigate