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The genuine OEM Lennox 19A06 is a ZP51K6E-TF5 scroll compressor rated at 4.5 tons for 230V 3-phase applications. It serves as the pump of the refrigeration circuit, compressing low-pressure refrigerant vapor into a high-pressure gas so heat can be rejected at the condenser coil. The scroll mechanism runs quietly and efficiently, making it a durable core component of your Lennox cooling system.
Typical compressor failure symptoms include a buzzing outdoor unit that won't run, nuisance breaker trips, loud grinding or clacking sounds, weak or absent cooling, and frequent short cycling. Electrical breakdown often reveals itself through overheating, a burnt odor, or locked-rotor amp draw that trips the overload protector.
The OEM 19A06 is matched to Lennox's exact tonnage, oil charge, and 230V 3-phase requirements. Using the factory-specified compressor protects your rated capacity and SEER, maintains warranty eligibility, and ensures a direct fit with the unit's contactor, line set, and refrigerant metering — avoiding the reliability risks of aftermarket replacements.