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The Lennox 19F81 is a genuine OEM Copeland ZP36K6E-TF5 scroll compressor rated at 3 tons (approximately 36,000 BTUH) on 208-230V, 3-phase power for R-410A systems. As the heart of your Lennox outdoor unit, this compressor pressurizes and circulates refrigerant through the condenser and evaporator coils, driving the entire cooling cycle. It is engineered to the exact electrical, capacity, and mounting specifications required by compatible Lennox air conditioners and heat pumps.
Common failure symptoms: a system that will not cool, warm air at the supply registers, the outdoor unit humming but not starting, tripped breakers, hard-start or short-cycling behavior, loud grinding or knocking noises, and an internal overload that repeatedly opens on heat. A locked-rotor or grounded compressor will typically prevent the unit from running at all.
Why OEM matters: installing the factory-specified 19F81 guarantees the correct displacement, motor windings, and internal protection your Lennox system was designed around. Off-brand or mismatched compressors can cause capacity loss, poor efficiency, oil-return problems, and premature failure. Choosing OEM protects your equipment's performance and preserves warranty compatibility.