708-B13A Series
Electronic Fan Speed Controls

The NEW 708-B13A Series electronic Controller is designed to provide proportional speed control of single phase motors for variable air volume applications. The Controller may be used with shaded pole or permanent split capacitor type motors from 120V to 480VAC.

The Controller phase proportions (modulates) the single phase power to regulate RPM as determined by an electronic, temperature sensing thermostat. Direct or reverse acting functioning is available with the addition of an aquastat.

The 708-B13A Series Controller functions with a fixed 2°F span over a 65° – 85°F range. An optional equivalent °C range is available. The control provides independent “maximum” and “minimum” speed limit adjustments. Also included, a separate continuous minimum speed or “drop out” function at setpoint.

Application

The variable speed Controller is applicable for adjustment of motor RPM within a limited range of operating temperatures that assure adequate ventilation of the motor. The Controller is designed for air moving applications using squirrel cage or propeller type fans. It may be suitable for other, non air-moving, direct drive motor applications. Motors should be open, drip-proof types.

Features and Benefits

   •  Applicable for shaded pole or permanent split capacitor motors.

   •  Multi-voltage applications.

   •  Minimum/Maximum speed adjustments.

   •  Motor cut-out adjustment.