Lennox 89M96 Dual Capacitor

The Lennox 89M96 Dual Capacitor is a high-performance 50+5 MFD 440V component engineered for demanding residential and commercial HVAC applications. This round dual run capacitor integrates two separate capacitance values—50 microfarads for the hermetic compressor and 5 microfarads for the condenser fan motor—into a single, space-saving unit. Operating at 440 VAC, this OEM replacement part (Lennox part number 100335-31) provides superior voltage handling compared to 370V alternatives, ensuring stable motor torque and consistent amperage during peak thermal loads. Built to rigorous Lennox specifications, it features a ±5% tolerance and is designed to resist oil leaks and electrical shorts, maintaining system efficiency in high-ambient environments. For contractors, this is a standard-stock item for servicing 10ACB, 13ACD, and other high-efficiency Lennox condensing units where a 50/5 MFD rating is required.

• Dual-Action Power: Supports both the HVAC compressor and fan motor starting/running cycles.
• High Voltage Threshold: Rated for 440V, allowing it to safely replace 370V capacitors for increased durability.
• Precise Tolerance: Features a +/- 5% capacitance range to prevent motor overheating and efficiency loss.
• Standardized Fit: Round case style design ensures compatibility with standard mounting brackets in Lennox condensers.
• Industrial Build: Rated for 50/60Hz operations with a 10,000 AFC (Available Fault Current) safety rating.

Common Questions

Can I use an 89M96 to replace a 370V capacitor?
Yes. In HVAC applications, you can always go up in voltage but never down. Using a 440V capacitor in a 370V system provides a higher safety margin and can extend the service life of the component under heavy load.

What are the signs that this capacitor needs replacement?
Technicians should look for "domed" or bulging tops, oil leakage, or an "open" reading during a capacitance test. If the compressor hums but fails to start, or the fan motor spins slowly, the 50+5 MFD values likely fallen out of the rated +/- 5% tolerance.

Does the terminal orientation matter during installation?
Absolutely. Ensure the "HERM" terminal connects to the compressor, "FAN" to the condenser fan, and "C" to the common/contactor. Reversing these can lead to immediate motor failure or reduced performance.

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.