LonMark® certified individual room controllers for VAV applications (Variable Air Volume) connected to an external air flow controller (Belimo VAV Compact).The controller keeps a constant temperature in the zone by controllingthe air flow, optional heating stages, and fan in sequence. By using a carbon dioxide sensor, the air quality can be controlled in the zone. The controller can be operated stand-alone or within a LonWorks® network. PI control with individual P-band and I-time setting for heating and cooling. Can be monitored and parameters can be set centrally via the central system or remotely with the TAC Xenta LonWorks® Operator Panel.