Lennox Y4003 Cap

The Lennox Y4003 is a professional-grade LMS CAP CBB65 motor run capacitor engineered for heavy-duty HVACR applications. This 60 MFD 370V capacitor provides the essential phase-shift required to initiate and maintain the torque of high-efficiency compressors and fan motors in Lennox residential and commercial units. Built with a metallized polypropylene film dielectric, this round-case component is designed to handle continuous-duty cycles in demanding environments. For contractors, the Lennox HVAC replacement parts catalog specifies the Y4003 for its precise capacitance tolerance and 50/60Hz compatibility, ensuring the system remains within OEM operational parameters.

Installation of this 370 VAC run capacitor helps stabilize voltage and manage heat dissipation, which are critical factors in preventing premature motor failure. The CBB65 motor capacitor construction features a durable aluminum housing and standard 1/4-inch quick-connect terminals for seamless field replacement. Whether you are performing a seasonal tune-up or an emergency repair, utilizing a genuine Lennox Y4003 capacitor ensures that start-up amperage remains consistent, protecting the windings of expensive OEM HVAC motors from electrical stress.

• Optimized Motor Performance: Maintains exact 60 microfarad output for stable compressor and fan motor operation.
• Thermal Stability: Encased in a rugged aluminum housing to manage HVAC electrical component heat loads during peak summer operation.
• Universal 50/60Hz Compatibility: Supports dual-frequency systems, making it a versatile Lennox replacement part for various regional grids.
• Self-Healing Technology: Utilizes advanced dielectric film properties to isolate internal faults and maintain circuit integrity.

What are the symptoms of a failing Lennox Y4003 capacitor?
Common indicators include a humming sound from the compressor without the unit starting, the outdoor fan spinning slowly, or "hard starting" where the system trips the breaker upon startup.

Can I use a 440V capacitor to replace the 370V Y4003?
Yes, a higher voltage rating (440V) is acceptable as an upgrade for a 370V application, provided the 60 MFD capacitance matches the Lennox Y4003 specifications exactly.

Does the LMS CAP CBB65 designation matter?
Yes, the CBB65 designation identifies it as a metallized polypropylene film motor run capacitor with an internal safety protector, essential for meeting secondary safety standards in HVAC systems.

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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.