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The genuine OEM Lennox 11B44 is a ZR144KCE-TF5-950 scroll compressor rated at 142,800 BTUH on 200/230V, 3-phase power for R-407C systems. It is the primary component of the cooling circuit, compressing refrigerant vapor and circulating it so the system can absorb and reject heat. The scroll design provides smooth, efficient, high-capacity operation for commercial and large residential Lennox equipment.
Common failure symptoms: no cooling, the compressor drawing locked-rotor amps and tripping the breaker, humming without starting, excessive noise or vibration, overheating and short-cycling on the internal overload, or a grounded winding measured during diagnosis.
Why OEM matters: the 11B44 is matched to Lennox voltage, displacement, and R-407C oil charge specifications, so it stages correctly and delivers rated 142,800 BTUH capacity. Using the OEM compressor preserves your warranty and avoids the electrical mismatch and premature burnout common with generic units. Replace the liquid-line filter drier and evacuate the system properly during installation.