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The OEM Lennox 18W48 is a Copeland ZP31K5E-TFD-830 scroll compressor rated at 31,200 BTUH, 460V, R-410A, three-phase. Built for commercial and light-commercial Lennox systems, this scroll compressor is designed specifically for high-pressure R-410A refrigerant, providing efficient, durable, and low-vibration performance across the cooling load.
Common failure symptoms include loss of cooling while the condenser fan continues to run, a compressor that hums but fails to start, tripped breakers, phase-loss or overload lockouts, and abnormal knocking or grinding noises. On three-phase equipment, reversed rotation from a phase swap can also cause loud operation and low performance until corrected.
Why OEM matters: R-410A operates at significantly higher pressures than R-22, so the genuine 18W48 is engineered for the exact voltage, phase, and refrigerant of your Lennox unit. Using the correct OEM scroll compressor ensures proper amp draw, correct rotation, adequate oil return, and full compatibility with your system's controls — protecting efficiency and your equipment warranty. Installation and refrigerant handling should be completed by a licensed HVAC technician.