Lennox 22W78 Run Capacitor

The Lennox 22W78 Run Capacitor is a high-grade 5 Microfarad 370Vac Oval Run Capacitor engineered for continuous duty in residential and commercial HVAC systems. This OEM Lennox replacement part is the direct superseding component for legacy part numbers 100600-01 and 22W7801. As a critical motor run capacitor, it provides the phase shift necessary to optimize the torque and efficiency of condenser fan motors and small blower assemblies. Constructed with a non-PCB dielectric and housed in a rugged oval aluminum casing, the 22W78 is built to withstand high ambient temperatures and the electrical stresses of 50/60Hz cycles. Techs will appreciate the 1/4" quick-connect terminals, which facilitate rapid field swaps during emergency service calls. Maintaining a 5 MFD capacitance within strict tolerances is essential for preventing motor overheating and premature winding failure. Whether you are servicing a Lennox air conditioner or a heat pump, this 370V HVAC capacitor delivers the precise electrical support required for stable motor operation.

• Direct OEM Match: Seamlessly replaces 100600-01 and 22W7801 without bracket modifications.
• Enhanced Motor Longevity: Provides steady voltage to reduce internal motor heat and improve starting torque.
• Durable Construction: Features a leak-proof oval aluminum housing designed for demanding HVAC environments.
• Universal 50/60Hz Compatibility: Suitable for a wide range of single-phase motor applications across different power grids.
• Safety Rated: Built with an internal physical interrupter to protect against capacitor rupture at end-of-life.

Can I use a 440V capacitor to replace this 370V unit?
Yes, you can safely use a capacitor with a higher voltage rating (like 440V) as long as it is 5 MFD, but you must never use a capacitor with a lower voltage rating than the original equipment specification.

What are the signs that my Lennox 22W78 capacitor has failed?
Common indicators include a bulging or "mushroomed" top, oil leaks around the terminals, the motor humming but failing to start, or a fan blade that requires a manual push to begin rotating.

Does the orientation of the oval shape matter during installation?
While the electrical performance is identical, the oval form factor is specifically chosen to fit original Lennox mounting straps. Ensure the straps are tightened to prevent vibration damage.

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.