VarioflowBOX COMF V2 400 variable airflow controller

Functions

Variable air volume (VAV) controller is used for autonomous control of the amount of ventilation air of one zone in central ventilation systems.

Construction

The VarioflowBOX COMF V2 VAV controller consists of a pair of tubes (supply and extract) and an electrical switchboard with a VARIOSU 24-10-V2 power supply unit, which is used to connect all related peripherals. This VAV controller can be supplied in a connected or split version. In the case of the coupled version, the tubes with the electrical distributor are mounted on a supporting metal plate. For connection to the circular pipe, both tubes are equipped with a lip seal. The individual parts are made of galvanized steel sheet.
The design differs for dimensions 100 to 160 and 200 to 400. The former has actuators placed together with control dampers inside the tubes and the air flow is measured by means of a thermoanemometer. The second design uses flow measurement based on the pressure differential measured by a probe inside each of the tubes. The actuators in this variant are mounted on the casing and are equipped with a pressure sensor for air flow. The control valves located in each of the tubes have class 2 leakage according to EN1751 when closed, except for DN100, which is only class 3.

Electro

Supply voltage 1x230 V/50 Hz. The VarioflowBOX COMF V2 is equipped with a 230 V/24 V power supply unit with a connection cable terminated with a 230 V fork with protective conductor. The air flow can be controlled by a 0-10 V analogue signal or by two potential-free contacts (BOOSTs), or can be extended to 3 potential-free contacts at an additional cost. The time period of the BOOST function is adjustable in any range for 2 to 3 zones (kitchens, sanitary facilities, etc.). The regulated air quantity in the supply tube is the same as in the exhaust tube (INPUT = OUTPUT). The degree of protection of the electrical switchboard is IP44. The communication interface for the control system can be selected between Modbus RTU or MP-Bus for dimensions 200, 250, 315 and 400. For dimensions 100, 125 and 160 only MP-bus is available.

Mounting

Wall or ceiling mounted with airflow directions horizontal or vertical. It is necessary to observe the airflow directions shown by the arrows on the tubes. The load capacity of the anchors for wall or ceiling mounting must correspond to the weight of the assembly according to the design (split or complete). Adequate access must be provided for servicing and maintenance of the controller. A straight piece of pipe of minimum length 2xD must be provided in front of the flow controller in the direction of airflow to ensure an optimum velocity profile before entering the controller.

Operating Conditions

Maximum airflow velocity is 7 m/s for dimensions 100, 125 and 160 and 12 m/s for dimensions 200, 250, 315 and 400. The minimum air velocity for dimensions 100, 125 and 160 is 0.2 m/s, for dimensions 200, 250, 315 and 400 is 2 m/s. In the factory, it is possible to set airflow ranges different from the standard ranges listed in the technical parameters table (Vmin and Vmax ranges must be specified when ordering). The maximum possible pressure difference before and after the damper is
900 Pa. The temperature range of the conveyed air should be from 0 °C to +50 °C and the maximum relative humidity of the flowing air up to 95 % (condensation on the surface or inside the tubes must be prevented). The air flowing through the tubes must be free of adhesive and abrasive impurities to prevent fouling of the flow rate or pressure sensor probes and the control damper.

Accessories

- Remote room controllers:
- CRP24-B1 wall-mounted controller with rotary dial for power adjustment
- CR24-B1P wall-mounted controller with button for switching between 3 ventilation intensities
- CRA24-B3 wall-mounted controller with button for switching between 3 ventilation intensities and also with dial for power adjustment at "COMF" intensity
- MSKM-KB damper for zoning of extracted air (priority extraction) including actuator
- AIRSENS-CO2 air quality sensor
- MAA silencer
- MTS silencer
- SONOULTRA flexible silencer
- SPIRO circular duct
- SEMIFLEX SONO soundproof hose