APPLICATION
VAV units with built-in fan are specifically designed to prevent cold fall and when using very cold (<12°C) of primary air. Cold fall is the cause of “draught complaints” in ventilation complaints and is not caused by the VAV unit, but by poor selection of the grilles. Most grilles only have a control range of 60-100% (Vmin-Vmax). VAV units have a much larger range and the rosters are usually not taken into account when selecting the VAV units. Often this is also a different supplier.
The VFS units with built-in series fan have a constant air volume to the room, When regulating back the primary air, room air is sucked in and mixed with the (cold) primary air and the air volume to the room remains constant. With very cold primary air, the total air volume is usually 20-30% higher than Vmax pimair, so that the air temperature blown in is never lower than 10°C below the room temperature. VAV units with built-in fan operate with a low pre-pressure and the secondary pressure drop is not critical.
FEATURES AND BENEFITS
- Reticle: the FloXact™ has a linear gain factor of at least 2.5x, and measures the average over a large number of measuring points according to the Log-Tchebycheff method. Due to the special profile shape of the FloXact™, it can regulate from 0.7 m/s inlet speed and has a very large control range and a maximum deviation of 2% at 3xD straight flow.
- Housing: Magnelis steel (S235+ZM310). This steel with a modern surface treatment with a very high corrosion resistance. It is less harmful to the environment and has a beautiful appearance (comparable to anodized aluminum.
- Fan: axial fan with forward-curved blades. EC motor (230VAC) and 2-10V control signal.
- Insulation: 50mm heavy pressing mineral wool with fiberglass cover and 20mm K-Fonik open cellular thermal and acoustic insulation
- Valve blade: Extruded aluminum contra rotary valve blades 100 mm. Airtightness Class-4 according to LUKA and EN-1751
- Controller: As standard, we supply the VAV units without control equipment or complete with Belimo controllers. Air-Concepts also installs control equipment supplied by third parties such as Priva, Johnson Controls, EasyIO, Distech, KMC, Sauter, Siemens, Honeywell, etc.