The MicroTech® III fan coil/unit heater controller is used to control vertical fan coil units and unit heaters, horizontal fan coil units and unit heaters, and large capacity fan coil units in all modes of operation, including operation of economizers, valves and all components necessary to maintain conditioned space temperature. By adding a LonWorks.® communication module, the unit controller can be integrated into a new or existing LonWorks communication network