Lennox 45M66 Collar Assembly 322838-754 Primary reasons for replacement include

Primary reasons for replacement include heat-related warping

Constructed with a magnetic clutch

Key Benefits for Technicians: Refrigerant Flow Monitoring: Provides a clear visual confirmation of a full liquid line

How do I verify if the 1173838 is compatible with my current HK42FZ017 or similar older revision

preventing damage to downstream electronics during a short circuit

Lennox 45M66 Collar Assembly 322838-754 Primary reasons for replacement includeThe Lennox 45M66 Collar Assembly is an essential OEM replacement part designed specifically for high efficiency HVAC cabinet and ductwork transitions. This Right Hand Collar Assembly (part number LB 96380A) provides the structural interface required to maintain rigid connections at the unit discharge or return plenum, ensuring no static pressure loss at critical junction points. Manufactured to original Lennox HVAC equipment tolerances, the 45M66