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CAV controllers

EN (Generation 3) with actuator

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EN  

For precise control of normal to high constant volume flow rates

Rectangular, mechanically self-powered air terminal units for supply and extract air systems with constant air volume flows


  • Suitable for volume flow rates up to 12600 m³/h or 3500 l/s
  • Volume flow rate adjustment from outside by rotary knob
  • Easy retrofitting of an actuator for volume flow setpoint adjustment
  • High control accuracy
  • No on-site test measurements required for commissioning
  • Casing air leakage to EN 1751, class C
  • Visual display of the damper blade position for operating point optimisation

 


Optional equipment and accessories


  • Acoustic cladding for the reduction of case-radiated noise
  • Secondary silencer Type TX for the reduction of air-regenerated noise
  • Hot water heat exchanger Type WT for reheating the airflow
  • Actuator for setpoint value switching or steady operation

General information

Application

  • Rectangular CAV terminal units for supply or extract air volume flow control in constant volume flow systems
  • Mechanical self-powered volume flow control without external power supply
  • Simplified project handling by ordering based on nominal size


Special features

  • Setting of the volume flow setpoint from the outside by rotary knob
  • High control accuracy of the set volume flow rate
  • Correct operation even under unfavourable upstream conditions
  • Visual display of the damper blade position for operating point optimisation
  • Easy retrofitting of an actuator for volume flow setpoint adjustment


Nominal sizes

  • 19 nominal sizes from 200 × 100 – 600 × 600 mm



Variants

  • EN: Air terminal units
  • EN-D: Air terminal units with acoustic cladding
  • Air terminal units with acoustic cladding and/or secondary silencer type TX for high acoustic requirements


Construction



  • Galvanised sheet steel
  • P1: Powder-coated, silver grey (RAL 7001)



Parts and characteristics

  • Air terminal unit ready for commissioning
  • Damper blade with low-friction bearings
  • Bellows for vibration damping
  • Cam plate with leaf spring
  • Rotary knob pointer and scale for adjusting the flow rate setpoint
  • Each air terminal unit is tested in the factory on a special ventilation test rig
  • Visual display of the damper blade position for operating point optimisation


Attachments

  • Min/Max actuators: Actuators for switching between minimum and maximum volume flow rate setpoint values
  • Variable actuators: actuators for variable volume flow or for switching volume flow setpoints
  • EN with actuator only up to H = 300 mm



Useful additions

  • Secondary silencer Type TX
  • Heat exchangers Type WT



Construction features

  • Rectangular casing
  • Flanges on both ends, suitable for duct connections
  • Air terminal units from H = 400 mm as double version (2 dampers with separate setting scales)
  • Acoustic cladding cannot be retrofitted


Materials and surfaces

Galvanised sheet steel construction



  • Casing and damper blade made of galvanised sheet steel
  • Leaf spring made of stainless steel
  • Polyurethane bellows
  • Plain bearings with PTFE coating
  • Cam plate and adjusting unit made of galvanised sheet steel


 



Powder-coated construction (P1)



  • Casing and damper blade made of galvanised sheet steel, powder-coated
  • Leaf spring made of stainless steel
  • Polyurethane bellows
  • Plain bearings with PTFE coating
  • Cam plate and adjusting unit made of galvanised sheet steel


 



Variant with acoustic cladding (-D)



  • Acoustic cladding made of galvanised sheet steel
  • Rubber seal for the insulation of structure-borne noise
  • Lining made of mineral wool


 



Mineral wool



  • Acc. to EN 13501, fire rating class A1, non-combustible

  • RAL quality mark RAL-GZ 388

  • Non-hazardous thanks to high biosolubility according to the German Ordinance on Hazardous Substances and Note Q of the European Regulation (EC) No. 1272/2008


Standards and guidelines

Meets the hygiene requirements of



  • EN 16798, Part 3
  • VDI 6022, Sheet 1
  • DIN 1946, Part 4
  • For further standards and guidelines, please refer to the hygiene certificate



Casing air leakage



  • EN 1751, Class C


Maintenance

Maintenance-free as construction and materials are not subject to wear



Technical information

Function Technical data, Quick sizing, Specification text, Order code

  • FUNCTION
  • TECHNICAL DATA
  • QUICK SIZING
  • SPECIFICATION TEXT
  • ORDER CODE
Schematic illustration of the EN EN3_gc_01.ai.png

① Damper blade

② Bellows

③ Bellows inlet

④ Scale sticker

⑤ Visual display of the damper blade position

⑥ Rotary knob

⑦ Actuator (optional)

Functional description

The air terminal unit is a mechanical self-powered unit and works without external power supply. A damper blade with low-friction bearings is adjusted by aerodynamic forces so that the set volume flow rate is kept constant within the differential pressure range. The aerodynamic forces of the airflow create a closing torque on the damper blade. An inflating bellows amplifies this force and at the same time acts as a damping element. The closing torque is countered by a leaf spring that unrolls over a cam plate. The cam plate is adapted in such a way that the damper blade moves when the differential pressure changes. As a result, the volume flow rate remains constant within narrow tolerances.

Efficient commissioning

Using the rotary knob, the desired volume flow setpoint can be set quickly on the external scale, no prior measurement required. The advantage over conventional flow adjustment dampers is that no repeated measurements or adjustments during commissioning are required. Should the system pressure change, e.g. by opening or closing of duct sections, the flow rates in the entire system will also change if flow adjustment dampers are used; however, this is not the case with mechanical self-powered air terminal units. The air terminal unit reacts immediately and keeps the set air volume constant.

Variants, Product details

  • VARIANTS
  • PRODUKT DETAILS

  • Air terminal units for constant air volume flow control

,

  • Air terminal units with acoustic cladding for constant air volume flow control
  • For rooms in which the case-radiated noise of the unit is not sufficiently reduced by a suspended ceiling
  • The rectangular ducts for the room under consideration must have adequate acoustic insulation (provided by others) on the fan and room ends
  • Acoustic cladding cannot be retrofitted

Downloads

certificati

manuali d'uso

Referenze

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Per domande di carattere generale riguardanti i nostri prodotti o servizi, è possibile contattare:
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