Lennox 25W66 Motor

The Lennox 25W66 is a professional-grade 460V 1/4 HP condenser fan motor engineered for high-static pressure applications in commercial and light industrial HVAC systems. Operating at a fixed 825 RPM, this PSC (Permanent Split Capacitor) motor is a direct OEM replacement for the Lennox 100640-02 and is physically identical to the 25W6601. Designed with a NEMA 48 frame and a 1/2-inch diameter shaft, it provides refined torque for outdoor AC unit fan motor assemblies, ensuring consistent heat rejection across the condenser coil. The sleeve bearing design and vertical stud-mounting profile allow for reliable CCWLE (Counter Clockwise Lead End) rotation in demanding environments. For technicians performing a Lennox 25W66 motor replacement, it is standardized for 460-volt 3-phase HVAC systems where a neutral isn't utilized for the fan circuit, maintaining efficient amperage draw under peak thermal loads.

Key Benefits:

• Direct OEM Compatibility: Verified replacement for Lennox 25W6601 and 100640-02, ensuring electrical and physical fit without field modifications.
• Industrial-Grade Build: Features a rugged 48-frame construction and sleeve bearings optimized for vertical motor mounting.
• Quiet Operation: The 825 RPM low-speed design reduces acoustic resonance while maintaining the cfm required for system head pressure control.
• Standardized Shaft Dimensions: Equipped with a 1/2" x 4.3" shaft to accommodate standard condenser fan blade hubs.

Common Questions:

Is the 25W66 interchangeable with the 25W6601?
Yes, these part numbers are functionally identical. The 25W66 is the catalog designation for the same physical motor found under the 25W6601 label.

What capacitor is required for this motor?
This motor typically requires a 7.5 MFD / 370-440 VAC capacitor. Always verify the rating on the technician’s original motor nameplate or the new motor housing before wiring.

Can this motor be used on 208-230V systems?
No. This is a 460V dedicated motor. Applying lower voltage will result in failure to start or winding burnout. Use only in high-voltage commercial applications.

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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.