The T168 series microprocessor based thermostat/controller provides a 0-10 Vdc or 4-20 mA control. This series controls a variety of two-pipe and four-pipe fan coil units, air handling units, unitary equipment, and various heating and cooling applications. The microprocessor combines a proportional plus intergral control algorithm with advanced adaptive logic. This provides control without the need for tuning or calibrating the control algorithm in the field.FEATURESDigital display of set point, ambient temperature, and operating mode.0-10 Vdc or 4-20 mA heat and cool outputs.Remote setback capability from a time clock or facility management system (contact closure).Auxiliary heat function.Remote and seasonal changeover sensor.Fahrenheit or Celsius display capability.In two pipe mode a built-in purge cycle assists the controller to determine if the controlling agent is providing heating or cooling.Line voltage continuous on/off or 3-speed fan control.Low voltage fan cycling operation with demand output.