The mechanical components and electronic components which are factory fitted, form the controls package. Each box is set up to the required flow rates and is subjected to an aerodynamic function test.

The boxes contain an averaging differential pressure sensor for air flow measurement and a control damper.

The control damper with plastic seal when closed complies with the air tightness requirements of DIN EN 1751. There are circular spigots on both sides. The controllers with additional acoustic cladding and/or a secondary circular silencer are suitable for very demanding acoustic requirements.

The flow rate control is a closed circuit system with external power supply. The pressure transducer, controller and actuator are selected to meet the controls requirements and operational conditions. The TROX VAV controllers can be supplied with control components from any reputable manufacturer to suit the project specification.

Characteristics

• Integrated averaging differential pressure sensor with 3 mm measuring holes and so insensitive to dirt
• Factory set up or programming of flow rate. This includes aerodynamic function test of each box using a dedicated test rig. Data covering set up is given on a test label attached to each controller
• Actual value signal is reffered to the nominal flow rate so simplifying any subsequent adjustment to nominal flow