OEM Lennox Scroll Compressor 48,300 BTUH 575V 3-Phase — 10H66

The genuine OEM Lennox 10H66 is a Copeland ZPS51K5E-TFE-830 scroll compressor rated at 48,300 BTUH (approximately 4 tons) for 575V, 3-phase, R-410A systems. The ZPS designation indicates a two-stage/modulating scroll, allowing your Lennox unit to match capacity to load for improved efficiency and comfort. As the core of the condensing unit, this compressor circulates refrigerant and powers the entire heat-transfer cycle in commercial 575V installations.

Common failure symptoms: A failing 10H66 may hum without starting, trip breakers, deliver poor or no cooling, struggle to stage properly, overheat and short-cycle, or produce grinding and knocking noises. Open, shorted, or grounded windings and a locked rotor indicate the compressor must be replaced.

Why OEM matters: The 575V 3-phase, two-stage design of the 10H66 is precisely matched to the Lennox systems it serves — correct voltage, staging control, capacity, and oil charge are all essential. The factory-specified part preserves rated efficiency, proper modulation, and your warranty, while aftermarket substitutes risk electrical incompatibility and premature failure. Confirm the part against the unit data plate, evacuate the system, replace the filter drier, and recharge to Lennox specifications during installation.