Hoffman Controls 706-123S Control

The Hoffman Controls 706-123S is a high-performance electronic fan motor speed controller engineered for manual, proportional speed regulation of single-phase motors. Specifically designed for Permanent Split Capacitor (PSC) and Shaded Pole motors, this unit provides precise control for direct-connected propeller fans or centrifugal blowers. Operating on a multiple voltage range from 120V to 277V, it supports up to a 5A resistive/inductive load, making it a versatile solution for varying field requirements. This controller utilizes phase proportioning to adjust motor RPM, effectively balancing airflow and energy consumption in critical HVACR applications.

For optimal reliability, the 706-123S features a field-adjustable minimum speed limit pot located on the side of the chassis. This allows technicians to set a baseline RPM that prevents motor stalling while ensuring adequate cooling over the motor windings. When integration involves motors with thermal overloads, the 706-123S speed control excels in maintaining stable operation across the full adjustment range. Note that current draw can increase with torque at lower speeds; always verify that the motor?s Full Load Amperage (FLA) is not exceeded at any point in the control curve.

• Universal Voltage Compatibility: Simplifies inventory by supporting any nominal supply from 120V thru 277V AC.
• Stall Prevention: Dedicated minimum speed adjustment ensures the motor maintains sufficient torque at low settings.
• Broad Application: Ideal for exhaust fans, unit heaters, and air-moving equipment utilizing PSC or shaded pole designs.
• Durable Construction: Features an integrated heat sink for effective thermal management during continuous 5A operation.

• Can this be used with three-phase motors? No, the 706-123S is strictly designed for single-phase motors that are rated for speed control via phase proportioning.
• What is the maximum current rating? This specific model is rated for a 5-amp maximum load. For higher current requirements, consider the 10A or 15A variants in the 706 series.
• Is a separate enclosure requested for installation? This control is typically mounted within an existing electrical cabinet or motor junction box, depending on local code requirements and environmental exposure.

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.