OEM Carrier Single Run Capacitor 4 MFD 370V for Model PY3PNA048090NA

This is the factory OEM single run capacitor for the Carrier PY3PNA048090NA packaged unit. The run capacitor stays in circuit continuously during motor operation, providing the phase-shifted current that keeps the fan motor running smoothly and efficiently. When this capacitor fails, you'll typically hear a persistent hum from the unit with no fan motor spin-up, or the system may short-cycle and shut down on thermal overload — both classic signs of capacitor failure that can cascade into costly motor or compressor damage if left unaddressed.

• Specs: 4 MFD (microfarad) | 370 VAC rated | Oval case | Factory-matched ±5% tolerance | OEM part numbers: P291-0403 (primary) / P291-1503 (secondary single run)
• OEM vs Generic: This OEM capacitor is manufactured to Carrier's exact electrical tolerances and has been tested to 60,000 service hours. Generic units often carry ±10% MFD variance, which accelerates motor winding stress and shortens service life — especially in a packaged rooftop or ground-mount unit exposed to ambient heat extremes.
• Install difficulty: 2/5 — Always disconnect power at the disconnect box and wait 5 minutes before touching capacitor terminals. A failed capacitor may still hold a dangerous charge — discharge using an insulated resistor or discharge tool before removal. Tools needed: 1/4" nut driver, needle-nose pliers, multimeter with capacitance mode. Photograph all wiring before disconnecting. Swap one wire at a time to avoid miswiring.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse. Genuine Carrier / Totaline part with UL approval and RoHS compliance.

Compatibility: Engineered as a direct OEM replacement for Carrier PY3PNA048090NA packaged units. Verify the MFD rating and voltage on your unit's data plate before ordering — always match MFD exactly and use equal or higher voltage rating. Our fitment team is standing by to confirm compatibility before you order — contact us with your model and serial number.