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The genuine OEM Lennox 55W31 is a Copeland ZP44K5E-TF5-830 scroll compressor rated at 44,500 BTUH, designed for 200/230V, 3-phase, R-410A Lennox condensing units and heat pumps. As the heart of your system, this compressor circulates and pressurizes refrigerant to drive the entire cooling cycle. Its scroll design delivers quiet, efficient, and highly reliable operation compared to older reciprocating models.
Common failure symptoms: a system that runs but won't cool, hard starting or repeated tripping of the breaker, loud grinding or knocking noises, overheating, or a compressor that hums but fails to start. Electrical faults such as an open winding, a grounded motor, or a locked rotor typically mean the compressor has reached the end of its service life.
Why OEM matters: Lennox systems are engineered around precise displacement, oil charge, and electrical specifications. Installing the factory-matched 55W31 guarantees correct capacity, proper oil return, and full compatibility with your Lennox controls and refrigerant metering — protecting your warranty and rated efficiency. Generic substitutes risk mismatched performance, premature failure, and voided coverage. Always replace the liquid-line filter drier and pull a deep vacuum during installation.