OEM Carrier Dual Run Capacitor 45+5 MFD 440V for Model PY4GNAB42090NA

This is the genuine OEM replacement dual run capacitor for the Carrier PY4GNAB42090NA split-system air conditioner, carrying OEM part number P291-4554RS. The dual run capacitor serves a critical role in your system — it simultaneously powers the compressor (45 MFD) and condenser fan motor (5 MFD), providing the electrical boost needed to start and sustain both motors during every cooling cycle. When this capacitor begins to fail, common symptoms include the outdoor unit humming but not starting, the condenser fan spinning slowly or not at all, the compressor short-cycling within minutes of startup, or the system tripping the breaker repeatedly. Left unaddressed, a weak or failed capacitor places enormous strain on the compressor — one of the most expensive components in the system.

• Specs: 45+5 MFD (microfarad) | 440V rated | Round case | ±6% tolerance | 50/60 Hz | 10,000 AFC | Castor oil protected | No-PCB construction | Height: 3-15/16" | Diameter: 2-7/16"
• OEM vs Generic: This is a genuine Carrier OEM capacitor — factory-matched to exact MFD and voltage tolerances for the PY4GNAB42090NA. Generic aftermarket capacitors often carry a wider ±10% MFD tolerance, which accelerates motor winding wear and can shorten compressor life significantly.
• Install difficulty: 2/5 — Always discharge the old capacitor before touching terminals (use an insulated screwdriver across terminals). Tools needed: 1/4" nut driver, needle-nose pliers, multimeter. Photograph all wiring before disconnecting. Match HERM, FAN, and COMMON terminal labels precisely.
• Warranty: 1-year OEM manufacturer warranty against defects. Ships same business day from our warehouse when ordered before cutoff.

Compatibility: Designed for the Carrier PY4GNAB42090NA split-system air conditioner. Also replaces legacy Carrier part numbers HC98KA046 and 319186-702. Always verify the MFD rating and voltage on your unit's data plate before ordering. Not sure it fits? Our HVAC parts specialists confirm fitment before you buy — just reach out before placing your order.