Description
US Motors 1678 — Permanent Split Capacitor Fan Motor Overview
The US Motors 1678 is a precision-engineered Permanent Split Capacitor (PSC) motor purpose-built for HVAC fan applications demanding reliable, multi-speed performance. Rated at 1/16 HP and operating on 277Vac single-phase power, this motor delivers consistent airflow control at 850 RPM across three selectable speeds — making it an ideal replacement or OEM-spec motor for commercial air handlers, fan coil units, and similar equipment.
Electrical Specifications
- Horsepower: 1/16 HP
- Voltage: 277Vac, Single Phase
- Amperage: 0.5 Amps
- Speed: 850 RPM, 3-Speed
- Motor Type: Permanent Split Capacitor (PSC)
Mechanical Specifications
- NEMA Frame Size: 42Y
- Enclosure Type: Open Air Over (OAO)
- Bearing Type: Self-Aligning Ball Bearing
- Mounting Style: Lug Mount
- Shaft Diameter: 1/2″
- Rotation: Clockwise (CW), Lead End
Key Features & Benefits
- 3-Speed Operation: Provides flexible airflow control to match varying system demands and comfort requirements
- PSC Motor Design: Delivers energy-efficient, quiet operation with high starting torque and smooth running performance
- Self-Aligning Ball Bearings: Extend motor service life and reduce maintenance requirements in demanding HVAC environments
- 42Y NEMA Frame: Industry-standard frame size ensures broad compatibility with OEM and replacement fan motor applications
- Open Air Over Enclosure: Allows cooling airflow over the motor body, ideal for fan-duty applications where airstream cooling is available
- Lug Mount Design: Simplifies installation and secure mounting in a variety of equipment configurations
- 277Vac Rating: Optimized for commercial building electrical systems commonly wired at 277V single phase
- 1/2″ Shaft: Standard shaft diameter for compatibility with common fan blade and blower wheel hubs
Typical Applications
- Commercial fan coil units
- Air handling units (AHUs)
- Unit ventilators
- HVAC blower assemblies requiring 277V single-phase power
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