MARS 12169 Run Capacitor

The MARS 12169 is a professional-grade 70/10 MFD 440V dual run capacitor engineered for high-demand residential and light commercial HVAC systems. This round dual run capacitor serves as a critical component for single-phase motors, providing the necessary phase shift to support both the compressor (HERM) and the condenser fan motor (FAN) from a single unit. Designed to meet EIA-456-A performance standards, it features a rolled aluminum shell and a non-PCB, oil-filled dielectric for efficient heat dissipation and internal pressure-sensitive interrupters for safety. The 440Vac rating ensures superior durability compared to standard 370V alternatives, allowing it to handle voltage fluctuations and startup loads in modern split systems and heat pumps. Equipped with 1/4-inch quick-connect terminals, this HVAC replacement capacitor is a reliable service part for maintaining optimal motor torque and system efficiency during extreme operating temperatures ranging from -40°C to +70°C.

Key Benefits

• Dual Section Functionality: Supports both compressor and fan motor operation simultaneously, reducing space and installation time.
• Enhanced Voltage Rating: The 440Vac design is backward compatible with 370V systems, providing a more robust overhead for electrical surges.
• Internal Safety Protection: Features a pressure-sensitive interrupter to disconnect the capacitor in the event of internal failure.
• Broad Compatibility: A common 70+10 microfarad spec used across multiple OEM platforms including Goodman, Rheem, and Carrier.
• Industrial Construction: Rugged aluminum housing resists corrosion and manages thermal loads effectively in outdoor condensing units.

Common Questions

Can I use this 440V capacitor if my old one was rated for 370V?
Yes. In HVACR applications, you can always increase the voltage rating of a run capacitor, but you must never go lower. A 440V capacitor will provide a longer service life in a 370V application due to its higher dielectric strength.

What are the signs that my 70/10 capacitor has failed?
Common indicators include a bulging or "mushroomed" top, oil leaks around the terminals, or a compressor that hums but fails to start. Always verify with a multimeter set to capacitance (MFD) mode; if the reading is outside the ±6% tolerance, replacement is necessary.

Does the physical shape (round vs. oval) matter for performance?
No. As long as the microfarad (MFD) and voltage ratings match or exceed the original specs, the shape only affects the mounting bracket. This round model fits standard circular straps found in most residential condensers.

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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.