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The genuine OEM Lennox 11C52 is a Copeland ZR42K5E-TFE-800 scroll compressor rated at 41,400 BTUH, 575V, R-22 refrigerant, 3-phase. This compressor is the core component of your Lennox condensing unit, compressing and circulating R-22 refrigerant to reject heat and sustain full cooling capacity. Its rugged scroll design provides quiet, efficient, and dependable performance built to Lennox specifications.
Common failure symptoms: If the 11C52 is failing you may notice the outdoor unit buzzing without starting, tripped breakers or contactors, loss of cooling, warm supply air, loud grinding or knocking, elevated amp draw, or thermal-overload shutdowns. Locked rotors, open windings, and internal seizing are common signs the compressor has reached end of life.
Why OEM matters: This factory compressor is engineered to Lennox's exact displacement, 575V electrical, and R-22 specifications, ensuring the proper oil charge, current draw, and BTU output for legacy Lennox systems. Non-OEM replacements risk capacity and voltage mismatches, oil-management failures, and premature burnout while voiding warranty coverage. The OEM 11C52 is the trusted choice to keep your R-22 Lennox unit running at rated performance.