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The genuine OEM Lennox 55W33 is a Copeland ZP44K5E-TFE-830 scroll compressor rated at 44,500 BTUH, 575V, 3-phase, engineered for R-410A systems. As the primary pump in your Lennox outdoor unit, it compresses and circulates R-410A refrigerant to drive the cooling cycle. The ZP-series scroll is built specifically for the higher operating pressures of R-410A, delivering efficient, dependable performance.
Common failure symptoms: loss of cooling capacity, a compressor that buzzes or trips the breaker when it tries to start, unusual mechanical noise, an internal overload that repeatedly opens, or failed windings read as open/shorted at the terminals. Short-cycling and warm air from the registers are common warning signs.
Why OEM matters: the factory 55W33 is matched to the exact displacement, R-410A rating, oil type, and 575V 3-phase electrical spec of your Lennox system. Using the OEM part ensures proper refrigerant compatibility, preserves efficiency and warranty coverage, and avoids the pressure and capacity mismatches that cause generic compressors to fail early. Always verify voltage, refrigerant type, and model before installation, and install a new filter drier with every compressor replacement.