TVA

This specification text describes just one variant of the product and applies to many applications. Texts for variants can be generated with our Easy Product Finder design program.

Application

Rectangular VAV terminal units for variable and constant air volume systems, suitable for extract air, available in 6 nominal sizes. High volume flow rate control accuracy. Ready-tocommission 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, a damper blade, and an integral sound attenuator. Factoryassembled control components complete with wiring and tubing.

Effective pressure sensor with 3 mm measuring holes, hence resistant to contamination. Baffle plate is fitted after the damper blade for optimum acoustic and aerodynamic performance.

Casing with acoustic and thermal insulation. Position of the damper blade indicated externally at shaft extension. Damper blade is supplied open so that the air flow will be ensured, even without the control function, except variants with defined safe position NC (normally closed). Meets the hygiene requirements of EN 16798, Part 3, of VDI 6022, Sheet 1, and of DIN 1946, Part 4.

Special features

• Integral attenuator with at least 26 dB insertion loss at 250 Hz
• Hygiene tested and certified
• Factory set-up or programming and aerodynamic function testing
• Setting and subsequent parameterisation on the control component possible, separate setting device may be required

• Casing and damper blade made of galvanised sheet steel
• Damper blade seal made of TPE plastic
• Lining is mineral wool
• Effective pressure sensor made of aluminium
• Plastic plain bearings

• To EN 13501, fire rating Class A1, non-combustible
• RAL quality mark RAL-GZ 388
• Non-hazardous to health thanks to being highly biosoluble in accordance with the Ordinance on Hazardous Substances and Note Q of the European Directive (EC) No. 1272/2008
• Faced with glass fibre fabric as protection against erosion through airflow velocities of up to 20 m/s
• Inert to fungal and bacterial growth

Connection type

Fan side spigot with groove for lip seal, suitable for connecting ducts according to EN 1506 or EN 13180. Room end suitable for the connection of ducts.

• Nominal sizes: 125 to 400 mm
• Volume flow rate range: 14 – 1602 l/s or 50 – 5768 m³/h
• Minimum differential pressure: Up to 258 Pa
• Maximum differential pressure: 1000 Pa
• Closed blade air leakage to EN 1751, Class 4
• Casing air leakage according to EN 1751, Class C (nominal sizes 125 - 250, Class B)

• Declaration of Hygiene Conformity in accordance with VDI 6022, Part 1 (01/2018), ÖNORM H 6020 (02/2007) and ÖNORM H 6021 (09/2003)
• Meets the hygiene requirements according to EN 16798 Part 3, VDI 6022 Sheet 1, DIN 1946 Part 4
• Acoustic data determined in accordance with ÖNORM EN ISO 5135:1999
• Setting of the volume flow rates without an adjustment device using Vmin- and Vmaxpotentiometers
• Electrical connections with screw terminals; no additional terminal boxes required
• A test report documenting factory parameterisation, functional testing and adjustment under airflow, based on reference measurements carried out on a regularly validated test rig in accordance with DIN EN ISO 9001, is available online

Specification text attachment

Variable volume flow control with electronic Easy controller to connect an external control signal; actual value signal can be integrated into the central BMS.

• Supply voltage 24 V AC/DC
• Signal voltages 0 – 10 V DC
• Possible override controls with external switches using voltfree contacts: CLOSED, OPEN, qᵥmin and qᵥmax
• Potentiometers with percentage scales to set the volume flow rates qᵥmin and qᵥmax without 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. 10 – 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]

• LPA [dB(A)]

Casing-radiated noise

• LPA [dB(A)]

No entry: none
D with acoustic cladding

D1 Double lip seal (one end)

Easy Volume flow controller, dynamic, analogue interface, setting of qᵥmin and qᵥmax with potentiometers (provided on site)