Carrier P291-3554RS Run Capacitor

The Carrier P291-3554RS Run Capacitor is a 35+5 MFD 440V dual run capacitor designed for high-duty cycle performance in residential and commercial HVAC systems. This round dual run capacitor integrates two separate capacitors into a single aluminum housing, providing the necessary phase shift for both the compressor (35 microfarad) and the condenser fan motor (5 microfarad). Rated for 440VAC, this component is fully backward compatible with 370V applications, offering superior dielectric strength and thermal headroom for 1100 RPM or 1075 RPM motors.

Built to meet UL 810 safety standards, the P291-3554RS features a non-PCB, biodegradable oil-filled construction and a built-in pressure-sensitive interrupter to prevent case rupture during end-of-life electrical failure. This unit is the direct OEM replacement capacitor for discontinued models P291-3553RS, P291-3553R, and P291-3553RSH. Its 1/4-inch quick-connect spade terminals are clearly marked—C for Common, HERM for the hermetic compressor, and FAN for the motor—ensuring a straightforward swap for service technicians in the field.

Key Benefits for Contractors:

• Broad Compatibility: Replaces obsolete Carrier, Bryant, and Payne part numbers including HC98CA035 and HC98JA036D.
• High Voltage Duty: 440VAC rating handles voltage spikes more effectively than standard 370V units, extending the service life of the HVAC capacitor.
• Technical Reliability: Engineered with metallized polypropylene film and 100% electrical testing to maintain a ±5% capacitance tolerance.
• Safety Certified: Features a patented current interrupter and is UL approved for operation in temperatures up to 70°C (158°F).

Common Technical Questions:

Can I use a 440V capacitor if my original was 370V?
Yes. In HVAC applications, you can always go up in voltage, but never down. A 440V capacitor is more robust and will handle the same load as a 370V unit with greater reliability.

What happens if the 35+5 MFD rating is mismatched?
Using the wrong microfarad (uF) rating can lead to motor overheating, reduced torque, or premature winding failure. Always match the 35/5 MFD specification exactly as required by the equipment manufacturer.

How do I identify a failing capacitor?
Common symptoms include a "bulged" or swollen top, leaking dielectric fluid, or a "humming" motor that fails to start. For field diagnosis, verify the actual MFD reading with a multimeter set to the capacitance scale.

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.