Lennox 11B77 Compressor

The Lennox 11B77 is a high-performance 6-ton scroll compressor engineered for commercial and heavy residential HVAC applications. Operating on 460V 3-phase power at 60Hz, this unit is designed to handle demanding thermal loads with a cooling capacity of approximately 73,500 BTUH. As the official Lennox 25M88 replacement, the 11B77 provides a seamless mechanical fit and updated internal components to ensure long-term reliability. This hermetic scroll compressor is optimized for R407C refrigerant and features standard 7/8-inch suction and 1/2-inch discharge sweat connections.

For technicians performing a retrofit or emergency swap, the Lennox 11B77 serves as a direct cross-reference for the Copeland ZR72KCE-TFD-830. Its high Energy Efficiency Ratio (EER) of 11.5 makes it a preferred choice for contractors aiming to restore system performance to OEM specifications. Whether you are servicing a Lennox LGC300H rooftop unit or a GCS16 series package system, this compressor delivers the consistent refrigerant mass flow required for stable evaporator temperatures and effective dehumidification.

• OEM Compatibility: Drops directly into Lennox and Allied commercial units, replacing obsolete part numbers including 25M88 and 15M59.
• Technical Specifications: 6-ton capacity, 460V / 3PH / 60Hz electrical configuration with a Rated Load Amperage (RLA) of 10.0 and Locked Rotor Amperage (LRA) of 70.
• Optimized Internals: Features a scroll mechanism for smooth operation, reduced vibration, and superior liquid handling compared to reciprocating models.
• Refrigerant Versatility: Specifically designed for R407C and R22 (with proper lubricant) in air conditioning applications.

Common Questions Regarding the Lennox 11B77

Is the Lennox 11B77 a direct replacement for the 25M88?
Yes, the 11B77 is the updated OEM replacement for the Lennox 25M88. It maintains the same physical footprint and electrical requirements, ensuring a straightforward installation for field technicians.

What refrigerant should be used with this compressor?
This unit is primarily specified for R407C. While it can be used in R22 systems, it is essential to verify lubricant compatibility, as these compressors typically ship with Polyolester (POE) oil suitable for HFC refrigerants.

What are the connection sizes for the 11B77?
The compressor features a 7/8-inch suction line and a 1/2-inch discharge line. Both are female sweat connections designed for standard copper brazing.

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Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.