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The genuine OEM Lennox 90W67 is a Copeland ZR21K5-PFV-800 scroll compressor rated at 21,000 BTUH for 208/230V, single-phase R-22 systems. Its scroll mechanism pressurizes and circulates refrigerant with fewer moving parts than a reciprocating unit, delivering smooth, efficient cooling that Lennox condensers were designed to rely on. This is the exact factory-specified replacement for your equipment.
Common failure symptoms: loss of cooling capacity, warm air at the registers, a compressor that buzzes or hums but won't start, tripped breakers, or loud knocking and grinding. On aging R-22 systems you may also notice hard starting, overheating, or the internal overload cutting the compressor out under load.
Why OEM matters: matching the original displacement, oil, and electrical characteristics is critical on R-22 systems, especially given the refrigerant's limited availability. The OEM 90W67 ensures correct capacity and a true bolt-in fit, protecting your Lennox system's efficiency and avoiding the recurring failures caused by mismatched universal compressors.