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OEM Lennox Dual Run Capacitor 50/7.5 MFD 440V — Y9645
Lennox

OEM Lennox Dual Run Capacitor 50/7.5 MFD 440V — Y9645

SKU: LNX-Y9645 Brand: Lennox
$18.95 $24.95

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Texas CMBL #19328542014
SAM.gov Registered
Govt POs Accepted

The genuine OEM Lennox Y9645 is a dual run capacitor rated at 50+7.5 MFD, 440V, in a round can and made in the USA. This single component serves two motor circuits — the 50 MFD side supports the compressor and the 7.5 MFD side supports the outdoor condenser fan motor — delivering the stored charge needed to start and run both motors reliably in your Lennox air conditioner or heat pump.

Common failure symptoms: The compressor or fan hums but won't start, the outdoor fan turns slowly or stalls, the breaker trips, cooling weakens, or the unit clicks repeatedly on start-up. A bulging, swollen, or oil-leaking top on the old capacitor is a definitive sign of failure. Because they endure continuous heat and electrical stress, capacitors are among the most common HVAC parts to fail.

Why OEM matters: The Y9645 is manufactured to Lennox's exact capacitance, voltage, and tolerance specifications, guaranteeing correct motor performance and rated efficiency. Generic capacitors can fall out of spec, overheat motors, and shorten compressor life. Choosing the factory OEM part protects your Lennox equipment and restores dependable cooling.

Shipping Information

  • Orders placed before 3PM CST ship same business day
  • Standard delivery: 2-5 business days
  • Express shipping available at checkout
  • Free shipping on orders over $75
  • Tracking number emailed upon shipment

Return Policy

  • 30-day returns on unused parts in original packaging
  • Electrical parts (capacitors, contactors, control boards) are final sale once installed
  • Email info@nationalhvacparts.com to initiate a return
  • Refunds processed within 5-7 business days

Frequently Asked Questions

Does this Capacitor fit my Lennox OEM Lennox Dual Run Capacitor 50/7.5 MFD 440V — Y9645?
Yes. This is the factory-specified OEM capacitor for the Lennox OEM Lennox Dual Run Capacitor 50/7.5 MFD 440V — Y9645. It is a direct drop-in replacement that fits without modification. Always verify the model number on your equipment nameplate before ordering.
How do I replace the capacitor on my Lennox OEM Lennox Dual Run Capacitor 50/7.5 MFD 440V — Y9645?
Difficulty: Easy (20–30 min)
Step 1: Turn off power at breaker. Step 2: Open condensing unit panel. Step 3: Photograph the old capacitor wiring (Common/Herm/Fan). Step 4: Discharge old capacitor with insulated screwdriver. Step 5: Disconnect and remove old capacitor. Step 6: Mount new capacitor, reconnect wires to matching terminals. Step 7: Close panel, restore power, test. Tools: screwdriver, needle-nose pliers.
My AC hums but won’t start. What part do I need?
An AC that hums but won’t start is the classic symptom of a failed capacitor. The capacitor provides the electrical boost to start the compressor. When it fails, you hear humming but the motor can’t overcome inertia. Other symptoms: fan spinning slowly, AC cycling on/off rapidly, or a visibly swollen capacitor. Fix: replace capacitor ($15–$80 DIY, 30 min).
Is this capacitor compatible with Bryant or Payne too?
Many Lennox parts are cross-compatible with Bryant and Payne since all three brands are manufactured by Carrier Global Corporation. The same physical part is often used across brand labels with different model numbers. To verify: check your Bryant or Payne equipment service manual for cross-compatible part numbers, or email info@nationalhvacparts.com with your model number.
Should I use OEM or aftermarket for my Lennox capacitor?
OEM strongly recommended. OEM capacitors have ±6% MFD tolerance vs aftermarket ±10%. The looser tolerance causes motor winding stress, higher temps, and shorter compressor life. Price difference is only $10–$20 — OEM is the clear value choice.
How fast does National HVAC Parts ship?
Orders placed before 3:00 PM CST ship the same business day. Standard delivery is 2–5 business days anywhere in the continental United States. Express shipping available at checkout. We ship from Houston, TX to all 50 states. 30-day return policy on all parts.
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Mike Rivera
HVAC Parts Specialist — Online