Rheem-Ruud 51-21854-18 Motor

The Rheem-Ruud 51-21854-18 is an OEM-spec condenser fan motor engineered for reliable performance in residential and light commercial HVAC systems. This 1/5 HP motor operates at 1075 RPM on a 208-230Vac single-phase circuit, pulling 1.25 Amps. Built with a 48 Nema frame size and a totally enclosed enclosure, this unit is designed to withstand environmental debris and moisture, ensuring long-term bearing protection. As a permanent split capacitor motor (PSC), it offers consistent torque for high-static outdoor applications. The CCW rotation (counter-clockwise) and shell-band mount configuration simplify field replacement for technicians servicing compatible Rheem and Ruud equipment. The motor features a 1/2" x 3 11/16" shaft and utilizes sleeve bearings for quiet operation. Integrating the correct HVAC replacement motor is essential for maintaining proper condenser coil heat transfer and system efficiency.

• OEM Compatibility: Exact drop-in replacement for Rheem and Ruud condensing units, ensuring correct motor lead length and mounting alignment.
• Durable Construction: The totally enclosed motor design prevents particulate ingress, extending the lifecycle of the internal windings.
• Standardized Specs: Uses a 48 frame motor footprint for universal compatibility with standard shell-band mounting brackets.
• Optimized Performance: Provides a steady 1075 RPM single speed output to meet manufacturer airflow requirements for refrigerant cooling.

Common Questions:

Does this motor include the run capacitor?
This is a Permanent Split Capacitor motor and requires a specific MFD/VAC capacitor for startup. It is standard practice to replace the capacitor during motor installation to ensure proper inductive load management.

How do I verify the rotation direction?
The Rheem-Ruud 51-21854-18 is rated for CCW rotation. Always verify the fan blade pitch and the lead end orientation to confirm compatibility with your specific condenser assembly.

Is this motor suitable for outdoor use?
Yes, its totally enclosed enclosure is specifically designed for outdoor condenser fan motor applications where exposure to the elements is high.

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.