TAC Xenta 104

The TAC Xenta 104-A is a zone controller intended for roof top unit, small AHU, and unit ventilator applications which have heating, cooling, and economizer functions. The controller keeps a constant zone termperature by sequenced control of the heating, cooling, and OA/RA dampers. By using a discharge air temperature sensor, the discharge and zone temperatures may be controlled in cascade if the TAC Xenta 104-A configuration properties are set accordingly. Cascade control also allows minimum and maximum limiting of the discharge air temperature. The fan On/Off is controlled by a 24 VAC isolated relay contact. The fan mode may be selected to operate continuously during the Occupied mode, or cycle with heating or cooling demand from the zone.