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The Lennox 11B78 is a genuine OEM Copeland ZR72KCE-TFE-830 scroll compressor rated at 72,000 BTUH (6 ton), 575V, 3-phase. This high-capacity scroll compressor circulates and compresses refrigerant vapor to drive the cooling cycle in your Lennox condensing unit. It is supplied as a direct factory replacement to restore rated capacity on compatible Lennox commercial and light-commercial systems.
Common failure symptoms: a unit that operates but produces little or no cooling, failure to start with only a hum, breaker trips at startup, excessive noise or vibration, or a compressor that overheats and trips on internal overload. Grounded or open motor windings measured at the terminals confirm a failed compressor.
Why OEM matters: the 11B78 is built to Lennox's exact 6-ton displacement, 575V 3-phase electrical rating, and factory oil charge. A genuine OEM compressor ensures a correct capacity and electrical match, protects any remaining equipment warranty, and avoids the reliability problems of generic replacements — keeping your Lennox unit running at designed efficiency.