Carrier P291-1504 Run Capacitor

The Carrier P291-1504 is a professional-grade 15 MFD 440V oval run capacitor designed for continuous duty in residential and commercial HVACR systems. As a veteran technician knows, maintaining precise capacitance is critical for motor torque and efficiency. This OEM replacement capacitor is the direct successor to the P291-1503, engineered to handle the inductive loads of compressor and fan motors while stabilizing voltage across the windings. Built with a non-PCB dielectric fluid and a UL approved current interrupter, this unit ensures safe operation under high-thermal conditions. The compact oval run capacitor geometry allows for seamless installation in tight control boxes, providing a reliable phase shift for optimal motor performance. Whether you are servicing a 30GA series unit or a 48TCDA packaged system, using genuine HVAC parts like the P291-1504 ensures you retain factory-spec efficiencies and prevent premature motor winding failure due to capacitance drift.

• Direct OEM Compatibility: Specifically engineered to replace the P291-1503, ensuring an exact physical and electrical match for Carrier, Bryant, and Payne equipment.
• High Dielectric Strength: Rated for 440 volts, this capacitor offers superior overhead compared to 370V alternatives, protecting against voltage spikes.
• Industrial Safety Standards: Features an internal pressure-sensitive interrupter designed to disconnect the capacitor safely at the end of its service life.
• Enhanced Motor Efficiency: Maintains the 15 microfarad rating within strict tolerances to reduce heat buildup in the motor windings.
• Durable Construction: Housed in a corrosion-resistant aluminum casing with multiple quick-connect terminals for flexible wiring configurations.

Can I use a 440V capacitor if my original was 370V?
Yes. In the field, upgrading to a 440V capacitor like the P291-1504 provides a higher insulation rating, which can lead to better reliability in high-ambient environments. You should never "down-spec" voltage, but "up-speccing" is a standard practice among contractors.

Why should I use the P291-1504 instead of a generic 15 MFD oval capacitor?
Matching the OEM part number ensures the physical dimensions—specifically the 5.3-inch height and oval profile—and the terminal layout align with the existing mounting brackets and wiring harnesses, saving time on the job site.

What are the signs that a run capacitor needs to be replaced?
Technicians should look for physical bulging (doming), oil leaks, or a capacitance reading that has drifted more than 5-10% from the 15 MFD rating during a preventative maintenance check.

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.