Lennox 89M77 Dual Capacitor

When you are out on a service call and find a bulging or leaking unit, the Lennox 89M77 Dual Capacitor is the reliable OEM replacement you need to get the system back online. This 40+5 MFD 440V Round Dual Capacitor is engineered specifically for high-efficiency HVAC equipment, providing the necessary phase shift for starting and running both the compressor and the condenser fan motor. Built with a rugged aluminum housing and metallized polypropylene film, it is designed to handle the high-ambient temperatures typical of outdoor condenser sections. This component features 1/4-inch male quick-connect terminals clearly marked for "C," "HERM," and "FAN," ensuring compatibility with existing wiring harnesses. As a direct replacement for Lennox part number 89M7701 and older 100335-09 versions, this 440 VAC HVAC run capacitor meets strict OEM tolerances to prevent motor overheating and ensure stable amperage draw throughout the cooling cycle.

Key Benefits for Technicians:

• Broad Compatibility: Serves as a direct OEM fit for numerous Lennox, Allied, and Armstrong condensing units and heat pumps.
• Dual-Run Design: Consolidates the 40 MFD compressor circuit and 5 MFD fan circuit into a single space-saving round profile.
• Enhanced Voltage Tolerance: Rated at 440 Volts, allowing it to safely replace 370V capacitors while providing superior protection against voltage surges.
• Industry Compliance: Manufactured to UL 810 safety standards with 10,000 AFC (Available Fault Current) internal protection.
• No PCB Construction: Utilizes environmentally safe, non-PCB oil for dielectric cooling and thermal stability.

Common Questions:

Can I use an 89M77 if the old capacitor is rated for 370V?
Yes, a 440V capacitor is a superior technical replacement for a 370V unit, as it can withstand higher electrical stress without degrading the dielectric material.

What does the 89M7701 cross-reference to?
This part is a direct replacement for Lennox 89M77, 100335-09, and several 52M, 46K, and 80K series part numbers frequently found in residential split systems.

How do I verify the capacitance is still within spec?
Technicians should use a multimeter with a capacitance setting to check the 40/5 MFD rating; replace the unit immediately if the reading falls outside the +/- 5% tolerance range.

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.