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The genuine OEM Lennox 74H12 is a Tecumseh AVB5549EXN reciprocating compressor rated at 49,000 BTUH, 208/230V, R-22, single-phase. This piston-driven compressor pressurizes and circulates refrigerant through your Lennox condensing unit, driving the cooling cycle. It is built to Lennox factory specifications and drops into compatible R-22 systems for restored capacity and dependable operation.
Common failure symptoms: A worn reciprocating compressor typically causes a system that runs but fails to cool, breakers tripping on startup, knocking or clattering from the outdoor unit, hard starts and short-cycling, or a compressor that hums and trips on overload without starting. Shorted or grounded windings and excessive amp draw confirm replacement is needed.
Why OEM matters: R-22 systems require a compressor matched to the correct refrigerant, voltage, and capacity. The Lennox 74H12 is the factory-authorized Tecumseh unit, ensuring proper oil charge, displacement, and electrical characteristics for rated efficiency and long service life. Aftermarket substitutes risk mismatched performance and premature failure — install the correct OEM compressor for a reliable, lasting repair.