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The genuine OEM Lennox 29K57 is a Copeland ZR11M3-TWC-961 scroll compressor rated at 108,000 BTUH, running on 208/230-volt, 3-phase power with R-22 refrigerant. As the heart of your Lennox commercial cooling system, this high-capacity compressor pressurizes and circulates refrigerant to remove heat efficiently. Its scroll construction delivers smooth, durable, and energy-efficient performance, and it is built to Lennox factory specifications for a precise, direct-fit replacement.
Signs that this compressor may be failing include weak or absent cooling, the outdoor unit buzzing without starting, tripped breakers, hard-start conditions, loud grinding or knocking, excessive vibration, and repeated short-cycling. On three-phase units, a shorted or open winding will usually prevent startup entirely.
Given the 108,000 BTUH capacity and R-22 refrigerant, using the exact OEM 29K57 is critical — voltage, displacement, and refrigerant compatibility must match your system to protect the sealed circuit and preserve warranty. Aftermarket alternatives often differ in oil charge and electrical characteristics, risking premature failure. Order now with same-day shipping to minimize downtime and restore full capacity.