For service calls involving a hum from the condenser or a fan that refuses to kick over, the Lennox 89M73 is the exact OEM replacement capacitor required to restore system timing. This 35/5 MFD 370V dual run capacitor is engineered to balance the electrical load between the compressor and fan motor, ensuring both components reach operational torque without excessive heat buildup. Rated for 370Vac and compatible with 50/60Hz cycles, this round canister is a direct cross-reference for the 89M7301 and 100335-05 part numbers, common in Lennox, Armstrong, and Ducane residential condensing units. Constructed with a rugged aluminum housing and filled with environmentally safe oil, this 35+5 microfarad unit is designed for high-heat environments where generic capacitors often fail prematurely. Whether you are troubleshooting an AC unit not blowing cold air or performing preventative maintenance on an HVAC dual run capacitor, using a genuine Lennox 89M73 round capacitor preserves the unit's original performance specs and electrical integrity. This part is a staple for technicians servicing Lennox AC capacitor replacement jobs on models like the 13ACX and XC14 series. Key Benefits: Verified Compatibility: Direct OEM match for 89M7301 and 100335-05, ensuring a precise fit in the mounting strap. Dual-Value Performance: Provides 35 microfarads for the compressor (Herm) and 5 microfarads for the fan (Fan) to maintain proper phases. Industrial Build: Rated for up to 370 Volts AC with a +/- 5% tolerance, handling voltage fluctuations and start-up surges reliably. Hazard-Free Design: Uses non-PCB oil and features a pressure-sensitive interrupter for safe failure at the end of its service life. Common Questions: Can I use a 440V capacitor to replace this 370V unit? Yes, in the field, a 440V rated capacitor is an acceptable upgrade for a 370V application as long as the 35/5 MFD rating remains identical; however, you cannot go lower than the original 370V rating. What are the symptoms of a failing 89M73 capacitor? Common indicators include a bulging top, a humming sound from the compressor without it starting, the fan motor spinning slowly or not at all, and the system tripping the thermal overload or circuit breaker. Is the 89M73 compatible with other brands? While branded by Lennox, this is a standard 35/5 370V round dual run capacitor and is frequently used in Allied, Armstrong, Concord, and Ducane equipment that calls for these specific microfarad and voltage tolerances. 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.
