Lennox 89M80 Run Capacitor

The Lennox 89M80 is a high-performance 45/5 MFD 440V dual run capacitor specifically designed for HVAC motor starting and continuous operation in demanding condensing units. As an essential component for both the compressor and the outdoor fan motor, this 440VAC round capacitor ensures the precise phase shift required for high-torque startups and efficient running cycles. This unit is the direct OEM-specified 100335-12 replacement, also superseding the 89M8001 and 69M6401 part numbers. Built to withstand high-ambient temperatures typical of rooftop or pad-mounted installations, its metallized film construction provides stable capacitance and minimizes energy loss. For technicians servicing Lennox air conditioners or heat pumps, using this HVAC replacement part is critical for maintaining the intended Power Factor and preventing excessive amperage draw that can lead to premature motor winding failure. Its round dual run configuration fits standard mounting brackets, making it a drop-in solution for most 45/5 microfarad applications requiring 440 volts or 370 volts.

Key Benefits for Technicians:

• Direct OEM Compatibility: Engineered to replace Lennox 100335-12 and 89M8001, ensuring exact physical and electrical fit.
• Dual-Purpose Engineering: Simultaneously supports the compressor (45 MFD) and fan motor (5 MFD) to streamline system maintenance.
• High Voltage Versatility: Rated for 440VAC, providing superior dielectric strength and backward compatibility with 370V systems.
• Internal Safety Protection: Features a pressure-sensitive interrupter designed to disconnect the capacitor safely in the event of an internal failure.
• Climate Resilience: Non-PCB oil-filled design allows for optimal heat dissipation during peak summer cycles.

Common Questions:

Can I use an 89M80 if my old capacitor is only 370V?
Yes. In HVAC applications, you can always upgrade to a higher voltage rating (440V) as long as the MFD (45/5) matches. The 440V rating indicates the maximum voltage the insulation can handle, offering more overhead than a 370V unit.

What are the signs that a Lennox 89M80 has failed?
Look for a bulged or swollen top, oil leaks, or a "hard start" condition where the compressor hums but fails to turn over. Using a multimeter to check the microfarad output between the "Herm," "Fan," and "C" terminals is the most accurate diagnostic method.

Why is my fan spinning but the compressor is not starting?
On a dual run capacitor, one side can fail while the other remains functional. If the 45 MFD side (Herm) is out of tolerance, the compressor will fail to start even if the 5 MFD side (Fan) is still operating.

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.