Century Motors 391 Motor

The Century Motors 391 is a versatile, multi-horsepower PSC blower motor designed for high-reliability performance in furnace blowers, air handlers, and fan coil units. Engineered as a direct replacement for HC680063, this 42 NEMA frame motor features a 3-speed configuration (1/4, 1/5, and 1/7 HP) to handle varying load requirements across residential and light commercial HVAC applications. Operating at 1050 RPM on 208-230V single-phase power, it draws a manageable 1.5 to 1.0 Amps depending on the selected speed. The open air over (OAO) enclosure ensures optimal heat dissipation during continuous duty, while the 1/2" x 6" flatted shaft provides the flexibility needed for most blower wheels, though field trimming may be required for specific cabinet depths. With reversible rotation and automatic thermal overload protection, the Century 391 motor offers the mechanical adaptability and safety a veteran technician expects on a service call.

• Multi-Horsepower Versatility: Covers 1/4 HP, 1/5 HP, and 1/7 HP ratings, reducing the need to carry multiple single-rating motors on the truck.
• Reversible Rotation: Simplifies installation by allowing for both CW and CCW lead-end rotation adjustments in the field.
• Robust 42 Frame Design: The 5-inch diameter NEMA 42 frame fits standard mounting brackets, including stud, band, or resilient ring configurations.
• Quiet Operation: Equipped with sleeve bearings for smooth, low-noise performance in sensitive indoor environments.
• Reliable PSC Design: Utilizes a Permanent Split Capacitor setup for improved efficiency (7.5 MFD / 370V capacitor required, not included).

Is the Century 391 a direct fit for my existing blower assembly?
The 391 is a common replacement for many OEM motors like the Carrier HC680063. Since it features a 6-inch long shaft, you should be prepared to cut the shaft to length if the original motor had a shorter extension.

What capacitor do I need to use with this motor?
This motor requires a 7.5 MFD / 370 VAC run capacitor. Using an incorrect rating or a weak capacitor will lead to overheating and premature winding failure.

Can I use this motor in a totally enclosed application?
No, this is an Open Air Over (OAO) motor. It relies on the airflow from the blower fan for cooling and must be positioned directly in the air stream to prevent thermal tripping.

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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.