Lennox 59M51 Motor

The Lennox 59M51 Motor is a high-performance 1/2 HP blower motor engineered for precision airflow in residential furnaces and air handlers. Operating on a 115V single-phase circuit, this PSC (Permanent Split Capacitor) motor is a direct OEM replacement for the K55HXHNC-8771 and is compatible with a wide range of Lennox, Armstrong, and Ducane equipment. This 1075 RPM, 3-speed motor allows for dialed-in CFM adjustments to meet specific heating and cooling load requirements, ensuring balanced static pressure across the ductwork.

Designed with a 48Y frame and a belly band mounting configuration, the 59M51 features a 1/2-inch diameter shaft with a 3-inch length, rotating in the CCW lead end (CCWLE) direction. Its 10.0 Amp draw and thermal protection make it a durable choice for high-demand cycles. When performing a swap out, technicians should verify the 15 MFD / 370 VAC run capacitor (sold separately) and inspect the blower wheel for imbalances that frequently lead to premature sleeve bearing wear.

Key Benefits:

• OEM Compatibility: Seamlessly replaces Lennox 59M5101, 88H31, and Armstrong 200226-01 units.
• Tunable Airflow: The 3-speed configuration provides flexibility for different furnace tonnages and ventilation needs.
• Industrial Build: Features a rolled steel housing and thermal overload protection for consistent performance under high static loads.
• Broad Application: Designed to fit popular models including the CMPA100U4, AF80, and AF90 series.

Common Questions:

What are the symptoms of a failing 59M51 motor?
Common indicators include humming without starting (often a capacitor issue), excessive vibration, or error codes like E292 on Lennox boards. If the motor is seized or pulling high amps, a full replacement is necessary.

Does this motor include a new run capacitor?
No, this is the motor only. A 15 MFD 370V capacitor is required for proper phase shift and motor torque.

Can I use this for a 230V application?
No, this is a 115V AC motor. Applying 230V will result in immediate winding failure.

This item is not eligible for free shipping.

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.