Lennox 46W17 Run Capacitor

The Lennox 46W17 (OEM Part 100463-03) is a precision-engineered 7.5 MFD 370V run capacitor designed for secondary phase correction in single-phase HVAC motors. This component is essential for maintaining the correct phase angle between voltage and current in condenser fan motors and furnace blower motors. With a 370 VAC rating and a 7.5 microfarad capacitance, it provides the requisite torque and electrical stability to prevent motor overheating and winding failure. As a veteran-preferred Lennox 46W17 replacement, this unit is also identical to and serves as a direct drop-in for part number 46W1701. Whether you are servicing a residential split system or a light commercial package unit, keeping these HVAC motor run capacitors stocked is critical for resolving common "fan not spinning" calls where the motor is humming but fails to initiate. Its robust, round run capacitor construction ensures high heat tolerance and reliable dielectric performance under continuous load.

• OEM Compatibility: Precision-matched for Lennox, Armstrong, and Ducane equipment, ensuring structural fitment and electrical alignment with original system specs.
• Direct Replacement: Fully interchangeable with Lennox 46W1701 and 100463-03, eliminating compatibility guesswork during field service.
• Optimized Performance: Maintains the exact 7.5 µF capacitance needed to keep PSC motors running at high efficiency and low amperage.
• High Voltage Margin: Rated at 370 VAC to handle the back EMF typically generated by 208/240V HVAC blower and fan applications.

Can I use a 440V capacitor to replace this 370V 46W17?
Yes. In the field, you can always step up in voltage. A 440V rated capacitor will operate cooler and offer a higher insulation margin than the 370V minimum, though you must never go below 370V.

Does this 7.5 MFD capacitor replace a 5 MFD unit?
No. You must match the microfarad (MFD/µF) rating exactly to the motor’s nameplate. Using a 7.5 MFD capacitor on a motor rated for 5 MFD will cause the windings to run too hot and lead to premature motor failure.

What are the symptoms of a failing Lennox 46W17?
Common indicators include a bulging or leaking casing, a condenser fan that requires a manual "push start," or a motor that trips the thermal overload protector due to high amperage draw.

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.