Rheem-Ruud 51-21853-15 Motor

The Rheem-Ruud 51-21853-15 is a professional-grade 1/3 HP condenser fan motor engineered for high-static pressure applications in commercial and residential HVAC systems. Operating at 460V and 1075 RPM, this single-phase PSC motor (Permanent Split Capacitor) provides reliable heat dissipation for outdoor units. Built with a NEMA 48 frame and a totally enclosed (TEAO) enclosure, it is designed to prevent moisture and debris from compromising the internal windings, ensuring performance in harsh environments. The motor features a 1/2" x 3-11/16" flat-surface shaft and uses a sleeve bearing system for quiet operation. As a direct OEM replacement motor, it supports CCW rotation (lead end) and utilizes shell-screw mounting for secure integration. For technicians sourcing part 51-21853-15, ensure the field installation includes a 10 MFD / 370V run capacitor to maintain proper torque and amperage draw.

Key Benefits

• Direct OEM Compatibility: Specifically engineered for Rheem and Ruud equipment, eliminating the guesswork of generic "will-fit" motor brackets.
• Industrial Build Quality: The TEAO enclosure protects internal components against wind-driven rain and airborne contaminants common in condenser environments.
• High-Voltage Efficiency: Optimized for 460V AC operation with a low 0.90 FLA, reducing operational costs and thermal stress on the controller.
• Simplified Mounting: Features a versatile shell-screw and shell-band configuration, matching the original factory footprint for faster swap-outs.

Common Questions

What is the correct rotation for the Rheem-Ruud 51-21853-15?
This motor is lead-end CCW (Counter Clockwise) rotation. Always verify the pitch of your fan blade before installation to ensure proper airflow direction.

Does this motor require a specific capacitor?
Yes, this unit must be paired with a 10 MFD / 370V run capacitor to ensure the 1/2 inch shaft motor reaches its rated 1075 RPM and stays within the 0.9 Amp range.

Can I use this as a replacement for a 1/4 HP or 1/2 HP motor?
Technicians should always match the HP rating. Using this 1/3 HP motor for a lower-rated unit may cause over-amping, while using it for a higher-rated unit will lead to premature failure.

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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.