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The genuine OEM Lennox 11A87 is a Copeland CR35K6E-TF5-875 reciprocating compressor rated at 31,900 BTUH for 200/230V three-phase systems using R-22 refrigerant. As the driving component of your Lennox condensing unit, it compresses refrigerant vapor to sustain the cooling cycle and move heat out of the conditioned space. Its rugged piston design offers dependable, long-lasting service in legacy R-22 applications.
Common failure symptoms: Look for a unit that energizes but won't cool, repeated breaker trips, loud knocking or grinding, high amp draw, or a compressor that overheats and cuts out on overload. Worn valves, mechanical seizure, or shorted windings commonly signal the end of a compressor's life. With three-phase power, confirm proper phase rotation and voltage after replacement.
Why OEM matters: Lennox engineers match each compressor to a precise capacity, refrigerant, and 200/230V three-phase electrical spec. The factory 11A87 ensures correct 31,900 BTUH output and R-22 compatibility, keeping the system within its designed operating range. Because R-22 equipment is legacy stock, the exact OEM part maintains proper charge and metering balance while protecting your Lennox warranty. Choose the genuine 11A87 for a guaranteed fit and rated reliability.