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The genuine OEM Lennox R39008C001 is a Tecumseh RKA5512EXD rotary compressor rated at 11,700 BTUH, 208/230V, single-phase, for R-22 refrigerant. Rotary compressors use a rolling piston in a cylinder to compress refrigerant efficiently in a compact package, making them ideal for the smaller-tonnage Lennox systems this part was designed to serve.
Common failure symptoms: Little or no cooling despite a running outdoor fan, a compressor that hums and stalls at start, frequent breaker trips, abnormal noise or vibration, and high amp draw from internal overload cycling. Shorted windings, a locked rotor, or worn internal components indicate the compressor needs to be replaced.
Why OEM matters: The factory Lennox R39008C001 supplies the correct mineral-oil charge, R-22-rated internals, and matching electrical specs for legacy Lennox equipment. Because R-22 systems are aging, an exact OEM replacement is the surest way to keep the unit reliable without risking capacity or oil mismatches. Choosing the OEM part restores designed performance and preserves any remaining warranty coverage.