Rheem-Ruud 51-27211-04 Blower Motor

The Rheem-Ruud 51-27211-04 Blower Motor is a heavy-duty, 1/2 HP OEM replacement motor designed for direct-drive applications in residential and commercial air handlers. Operating at 208-230V single-phase power, this PSC blower motor delivers a steady 825 RPM, ensuring consistent static pressure and airflow across the evaporator coil. Built with a 48 NEMA frame and an open air over (OAO) enclosure, it relies on the system's airflow for cooling, maximizing efficiency during high-demand cycles. The CCW rotation and sleeve bearing design provide the quiet, vibration-free operation required for sensitive indoor environments. For secure fitment, this motor utilizes a shell-band or shell-screw mounting configuration and features a standard 1/2" x 3 5/16" keyed shaft. To ensure proper torque and motor protection, a 25 MFD / 370V run capacitor must be used to maintain the 2.9 Amp draw under load.

Key Benefits for Contractors:

• Direct OEM Fit: Drop-in replacement for Rheem, Ruud, and WeatherKing units to eliminate field modifications.
• High Torque Stability: Permanent split capacitor design offers reliable startup performance in high-static ductwork.
• Thermal Efficiency: Open air over design facilitates heat dissipation, extending the operational life of the internal windings.
• Versatile Mounting: Supports both shell-band and shell-screw mounting, providing flexibility for various blower housing geometries.
• Standardized Shaft Specs: 1/2-inch diameter shaft fits standard blower wheels, reducing the need for shaft adapters.

Common Questions:

Which capacitor is required for the 51-27211-04 motor?
This motor requires a 25 MFD / 370V run capacitor. Utilizing an incorrect capacitance can lead to overheating or winding failure.

Can this motor be used in outdoor condenser applications?
No, this is an indoor furnace blower motor with an open air over enclosure. It is not rated for exposure to rain or direct outdoor elements.

Is the rotation reversible on this model?
This specific model is fixed for counterclockwise (CCW) rotation. Always verify the rotation of the existing fan wheel before installation.

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.