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Sentera VAV ventilation system

19/02/2024 Yves Vinck

For the open house at one of our customers, we built a VAV demo unit in which various Sentera product groups are incorporated to work together as one solution. To explain the complete operation of this installation step by step, we have made a detailed video which you can watch on our Youtube channel. Check out the full article for more information.

Sentera VAV ventilation system
As a leading manufacturer of control solutions for HVAC and ventilation systems, Sentera offers a wide range of products that can be used individually or combined as a complete solution.

CO2 based damper control
Especially for the open house at one of our customers, we built a VAV demo unit in which various Sentera product groups are incorporated to work together as one solution. This solution is based on our new ACT-H-125 valves which are controlled by means of an analog signal from our DCMFF-2R CO2 duct sensors. When the CO2 level increases, the sensor will open the valve to allow more fresh air to be supplied. Several valves, each with their own sensor, can be used in the same installation. To guarantee a constant supply of fresh air (regardless of how many valves are open), the fan is controlled by an electronic EVS fan speed controller, which in turn is controlled by a DPS differential pressure controller. When opening the valve(s), the differential pressure will drop and the differential pressure controller will increase the fan speed via the electronic fan speed controller to guarantee the necessary flow rate.
Differential pressure based fan speed control
Conversely, when closing the valve(s) (when the CO2 level drops) the differential pressure will increase and the DPS differential pressure controller will decrease the fan speed via the electronic EVS fan speed controller to bring the flow back down to the required level.

All parameters of the Sentera products used can be adjusted according to the application or requirements via the Sentera Modbus converter and the free 3SModbus software.
To explain the complete operation of this installation step by step, we have made a detailed video which you can watch here. To obtain an increase in the CO2 level into the ventilation duct in order to demonstrate the operation of the installation, CO2 is added by means of an aerosol.

The following Sentera products were joined into one solution in this installation:
  • ACT-H-125 round motorized control valve: round motorized control valve for 125mm diameter air ducts. The damper blade position can be set via a 0-10 V signal or via Modbus RTU communication. The minimum and maximum position and many other parameters can also be adjusted in the Modbus registers.
  • DCMFF-2R intelligent CO2 duct sensor: air duct sensor that measures CO2, temperature and relative humidity. It combines these 3 measured values in one intelligent output to which you can directly connect the EC fan or control valve.
  • DPSPF-1K0-2 differential pressure controller 1 kPa with display: high resolution differential pressure and airflow controller with display, 0-1000 Pa range, integrated PI control and K-factor, analogue / modulating output 0-10 VDC / 0-20 mA / PWM, Modbus RTU communication.
  • EVS-1-15-DM 1,5 A electronic fan speed controller with analogue input and Modbus: the EVS controls the speed of single-phase voltage-controllable motors. The technology used is phase angle control (Triac technology). They have Modbus RTU communication and an input to remotely start/stop the motor. The minimum and maximum speeds are internally adjustable via a trimmer. The output voltage to the motor is within the range between the set minimum output voltage (30-70% of the supply voltage) and the supply voltage and can be controlled via the analogue input (0-10 VDC / 0-20 mA) or via Modbus RTU.
  • RDPU-HMU HVAC controller: central HVAC controller with built-in touch screen. Depending on the firmware that is loaded in the device, there are different applications. In this case it is the HMU Home Monitoring Software. This allows you to monitor the air quality in every room of your building. This solution is extremely suitable for a private home, but also for a school or (public) building.
  • SIGWM internet gateway: An internet gateway for Sentera products. It connects to the internet via the local Wi-Fi network. This makes setting up your Sentera network easier. It also offers the possibility to access your installation remotely. Connect and monitor or control your compatible HVAC products remotely. You can log data and receive alarms. Define different users and create your personal dashboard.
  • SEPS8-24-40 switching power supply: supply voltage: 85-264 VAC / 50-60 Hz, output voltage: 24 VDC / 40 W / 1.67 A, IP65, connections via spring clamp connectors or via RJ45 connectors. Power over Modbus (PoM) compatible. Protected against overvoltage and overcurrent.
  • MDB-M-6 Modbus RTU distribution box with 6 channels: both the 24 VDC supply voltage and the Modbus RTU communication are distributed over the 6 RJ45 connectors. MDB-M/6 is compatible with Sentera sensors, sensor controllers, HVAC controllers and speed controllers with Modbus RTU communication.
All products work together as a complete VAV solution that can be monitored and set up remotely via Senteraweb. If you have any questions about this setup after watching this video, or if you would like more information regarding other solutions, do not hesitate to contact one of our employees.
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