Does this unit replace 2-wire or 4-wire sequencers

The UGLK1000 is suitable for both hot/chilled water and steam applications

It is rated for a maximum inlet pressure of 2 PSI and features a positive dead-end lock-up (PDEL) capability

this control is rated for both 120 VAC and 240 VAC applications

always verify the equipment model

Lennox 45M66 Collar Assembly 321142-301 Does this unit replace 2-wireThe 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