Lennox 72W39 Capacitor

Upgrade your condenser service with the Lennox 72W39 75/10 MFD 440V Round Dual Run Capacitor, a professional-grade electrical component engineered for high-demand cooling systems. This 75/10 MFD 440V run capacitor is the industry-standard direct replacement for legacy part numbers 100335-51 and 72W3901, ensuring seamless integration into Lennox 14ACX and 14HPX series units. As a dual run capacitor, it provides dedicated starting and running torque for both the compressor and the condenser fan motor, maintaining the phase shift necessary for optimal motor efficiency.

Constructed with a rugged aluminum casing and featuring a 440V AC rating, this HVAC replacement capacitor is built to withstand high internal temperatures and voltage spikes common in residential and commercial environments. The round dual run capacitor design allows for a secure fit in standard mounting brackets, while the 10,000 AFC internal protection ensures circuit safety during overpressure conditions. For contractors, utilizing this OEM Lennox 72W39 part prevents common field failures such as motor overheating or intermittent startup issues, keeping systems within factory technical specifications.

• Precise Capacitance: Features a dual 75/10 microfarad rating to handle the high-load demands of 5-ton cooling systems.
• Universal Voltage Compatibility: Rated at 440VAC, making it a backward-compatible upgrade for older 370V applications.
• Standardized Form Factor: The round cylindrical shape ensures compatibility with existing HVAC mounting straps and enclosures.
• Reliable Motor Support: Specifically tuned to provide consistent current to fan motors and compressors, reducing mechanical wear.

What does a 75/10 MFD capacitor do?
This dual-value component supports two separate electrical circuits within your AC unit: the 75 MFD side assists the compressor motor, while the 10 MFD side powers the condenser fan motor.

Can I use a 440V capacitor to replace a 370V?
Yes, you can always increase the voltage rating of a capacitor (e.g., 440V replacing 370V), as it signifies the maximum voltage the part can handle. Never decrease the voltage rating below the original spec.

How do I know if my 72W39 capacitor is failing?
Common indicators include a bulging or "swelled" top, fluid leaking from the terminals, or a "humming" sound from the motor that fails to start the fan or compressor.

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.