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.
The number of applications for LonMark certification is growing rapidly. To make sure your products are on-track for certification, design conformance into them by following the LonMark Interoperability Guidelines v3.4.
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