This specification text describes the general properties of the product. Texts for variants can be generated with our Easy Product Finder design program.

Specification text

Rectangular VAV terminal units for variable and constant air volume systems, suitable for supply or extract air, available in 39 nominal sizes. High volume flow rate control accuracy. Ready-to-commission unit which consists of the mechanical parts and the electronic control components. Each unit contains an averaging effective pressure sensor for volume flow rate measurement and damper blades. Factory mounted control components complete with wiring and tubing. Position of the damper blades indicated externally at the shaft extension. The damper blade is factory set to open position, which allows a ventilation airflow even without control; this does not apply to variants with defined safe position NC (normally closed).

Special features

• Integral effective pressure sensor with 3 mm measuring holes (resistant to dust and pollution)
• Factory set-up or programming and aerodynamic function testing
• Parameters can also later be set on the control component. Depending on the control component, an additional adjustment device may be necessary

Materials and surfaces

• Casing made of galvanised sheet steel
• Shafts made of galvanised steel
• Damper blades and differential pressure sensor made of aluminium
• Gears made of anti-static plastic (ABS), resistant to temperatures up to 50 °C
• Plastic plain bearings

Connection type

• Flanges on both ends, suitable for duct connection

Technical data

• Nominal sizes: 200 × 100 to 1000 × 1000 mm
• Volume flow rate range: 42 – 10454 l/s or 149 – 37635 m³/h
• Minimum differential pressure: up to 109 Pa (without secondary silencer)
• Maximum differential pressure: 1000 Pa
• Casing air leakage to EN 1751, class B
• Closed blade air leakage to EN 1751, Class 1 (B + H ≥ 600 mm)

Equivalence criteria

• Acoustic data to ÖNORM EN ISO 5135:1999
• Setting of the volume flow rates without adjustment device using qvmin and qvmax potentiometers
• Electrical connections with screw terminals, no junction box required
• Aerodynamic functional testing of each volume flow controller on a test rig at the factory; the test result is given on a sticker on the controller

Specification text attachment

Variable volume flow control with electronic Easy controller for applying a reference value and capturing an actual value to be integrated with the central BMS.

• Supply voltage 24 V AC/DC
• Signal voltages 0 – 10 V DC
• Possible override controls with external switches using volt free contacts: CLOSE, OPEN, qᵥmin and qᵥmax
• Potentiometers with percentage scales to set the volume flow rates qᵥmin and qᵥmax without an adjustment device
• The actual value signal relates to the nominal volume flow rate such that commissioning and subsequent adjustment are simplified
• Volume flow rate control range: approx. 20 – 100 % of the nominal volume flow rate
• Clearly visible external indicator light for signalling the functions: Set, not set, and power failure
• Electrical connections with screw terminals
• Double terminals for looping the supply voltage, i.e. for the simple connection of voltage transmission to the next controller

Sizing data

• qᵥ _______________________ [m³/h]
• Δpst _______________________[Pa]

Air-regenerated noise

• LPA _______________________[dB(A)]

Case-radiated noise

• LPA _______________________[dB(A)]

Life cycle assessment

A life cycle assessment is available for the product type in the form of an environmental product declaration (EPD), which has been checked and published by a programme holder.