Lochinvar & A.O. Smith 100166080 Thermal Switch 322057-301 those part numbers are identical

those part numbers are identical and refer to the same Size #05 orifice assembly

and packaged HVAC systems

always verify the rotation of your existing blower wheel before mounting to ensure correct airflow direction

When you're servicing high-efficiency units like the Lochinvar Knight XL or A

Lochinvar & A.O. Smith 100166080 Thermal Switch 322057-301 those part numbers are identicalThe Lochinvar & A. O. Smith 100166080 Thermal Switch is a critical safety component designed for Residential FVIR (Flammable Vapor Ignition Resistant) gas water heaters. As a resettable thermal switch, it monitors the combustion chamber for excessive temperatures or restricted airflowcommon issues in systems with a clogged flame arrestor or inadequate makeup air. This rollout switch acts as a manual reset high limit, preventing gas flow to the burner