Nidec-US Motors 1973 Motor

The Nidec-US Motors 1973 Motor is a professional-grade 1/2 HP 1075 RPM 3-speed blower motor engineered for demanding residential and light commercial direct-drive fan applications. This Permanent Split Capacitor (PSC) motor operates on 208-230Vac single-phase power, drawing a steady 2.9 Amps at full load. Built with a standard 48Y NEMA frame size (5.6-inch diameter), it features a 5-inch long, 1/2-inch diameter shaft with a flat and keyway for secure wheel attachment. The open air over (OAO) enclosure utilizes the system's own airflow to maintain optimal operating temperatures, supported by self-aligning sleeve bearings that provide an all-angle thrust system for quiet, reliable performance in any orientation. With reversible rotation capability and multiple mounting options—including hub, stud, or belly band mount—this versatile unit is the technician's choice for field replacements.

Nidec 1973 blower motor is a direct replacement for 621940R and 46K16 models. For a successful installation, ensure you utilize a new 10 MFD / 370V capacitor as required by the manufacturer's spec to maintain efficiency and torque across all three speeds.

• Universal Compatibility: Includes 2-1/2 inch diameter hub rings and extended studs for seamless direct drive furnace motor retrofits.
• Enhanced Thermal Protection: Features an integrated automatic reset thermal overload protector to prevent winding failure during high-static conditions.
• Flexible Installation: Reversible rotation allows for easy clockwise (CW) or counter-clockwise (CCW) lead configuration at the job site.
• Rugged Construction: Class B insulation rated for 40°C ambient environments ensures durability in confined mechanical rooms.

What capacitor is required for the Nidec 1973?
This motor is designed to work with a 10 MFD 370V permanent split capacitor. Always replace the capacitor when installing a new motor to ensure proper starting torque.

Can I use this motor to replace a 115V blower?
No, this is a 208-230V HVAC motor. Wiring a 230V motor to 115V will cause it to underperform and eventually burn out due to excessive amperage draw.

How do I change the rotation of the motor?
The rotation is electronically reversible through the lead wires. Simply swap the rotation-specific connectors according to the wiring diagram on the motor decal before final mounting.

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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.