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The genuine OEM Lennox 11A80 (Copeland CRPQ-045E-TFE-970) is a 57,000 BTUH reciprocating compressor built for 575V, three-phase, R-22 Lennox equipment. It uses a piston-driven design to draw in low-pressure refrigerant vapor and discharge it at high pressure, driving heat transfer through the condenser and evaporator so your system delivers its rated cooling output.
Common failure symptoms: no cooling despite the fan running, the compressor hums but won't start, repeated breaker or overload trips, loud knocking or rattling, excessive heat, or short-cycling. A shorted, open, or grounded winding measured on a multimeter confirms compressor failure.
Why OEM matters: the 11A80 is factory-matched to your Lennox unit's 575V electrical supply, capacity, and internal oil charge. Installing the correct OEM compressor ensures proper fit and rated efficiency, avoids the electrical mismatches common with generic substitutes, and helps protect your equipment investment against premature repeat failures.