Rheem-Ruud 51-21854-17 Motor

The Rheem-Ruud 51-21854-17 Motor is a high-performance 1/6 HP condenser fan motor engineered for demanding outdoor HVAC applications. Built as a Permanent Split Capacitor (PSC) motor, this unit operates at 1075 RPM on 208-230V single-phase power, drawing only 0.75 Amps at full load. This 48 NEMA frame motor features a totally enclosed enclosure to protect internal windings from environmental debris and moisture, ensuring consistent heat transfer across the condenser coils.

Designed for direct-drive applications, the 51-21854-17 utilizes a shell-band mount and a 1/2 inch x 3 11/16 inch shaft. Professional technicians value the CCW rotation (counter-clockwise) and the reliable sleeve bearing construction, which provides quiet operation in residential and light commercial units. This OEM replacement motor is compatible with various Rheem, Ruud, and Weather King condensing units, including the FADC and RADD series. For optimal performance, pair this motor with a 3 MFD / 370V run capacitor to maintain specified torque and efficiency during peak summer cycles.

• OEM Compatibility: Exact drop-in replacement for ProTech 51-21854-17 and Emerson K55HXDRL-0014.
• Efficient Cooling: 1075 RPM single-speed output maintains correct static pressure and airflow for refrigerant heat rejection.
• Environmental Protection: The totally enclosed housing prevents premature failure caused by rain, dust, and corrosive outdoor air.
• Standardized Fitment: 48 frame size and shell-band mounting ensure seamless integration into existing fan motor brackets.

• What is the correct rotation for this motor? This motor is CCW rotation (counter-clockwise) as viewed from the lead end.
• Which capacitor is required for installation? This PSC motor requires a 3 MFD / 370V run capacitor (sold separately).
• Can this be used in a heat pump? Yes, provided the 1/6 HP, 230V, and 1075 RPM specs match your existing fan motor and blade pitch.

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.