Type EN

For the precise control of normal and high constant volume flows

 

Rectangular self-powered volume flow controllers for the control of supply air or extract air in constant air volume systems

  • Suitable for volume flow rates up to 12,096 m³/h or 3,360 l/s
  • Volume flow rate can be set using an external scale, no tools required
  • High control accuracy
  • No on-site test measurements required for commissioning
  • Suitable for airflow velocities of up to 8 m/s
  • Casing air leakage to EN 1751, class C


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 switching between setpoint values
small_tab1_Serie EN
  • Application
  • Description

Application

  • Rectangular CONSTANTFLOW CAV controllers of Type EN for the precise supply air or extract air flow control in constant air volume systems
  • Mechanical self-powered volume flow control without external power supply
  • Simplified project handling with orders based on nominal size

Special features

  • Volume flow rate can be set using an external scale; no tools required
  • High volume flow rate control accuracy
  • Any installation orientation
  • Correct operation even under unfavourable upstream or downstream conditions (1.5 B straight section required upstream and 0.5 B required downstream)

Variants

  • EN: Volume flow controller
  • EN-D: Volume flow controller with acoustic cladding
  • Units with acoustic cladding and/or secondary silencer Type TX for demanding acoustic requirements
  • Acoustic cladding cannot be retrofitted

Construction

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

Parts and characteristics

  • Ready-to-commission controller
  • Damper blade with low-friction bearings
  • Bellows that acts as an oscillation damper
  • Cam plate with leaf spring
  • Scale with pointer to set the volume flow rate setpoint
  • Aerodynamic function testing of each unit on a special test rig prior to shipping

Attachments

  • Min/Max actuators: Actuators for switching between minimum and maximum volume flow rate setpoint values
  • Modulating actuators: Actuators for the stepless adjustment of volume flow rates or to switch between minimum and maximum volume flow rate setpoint values
  • Retrofit kits: Actuators and installation accessories

Useful additions

  • Secondary silencer Type TX
  • Heat exchanger Type WT

Construction features

  • Rectangular casing
  • Flanges on both sides, suitable for duct connection

Materials and surfaces

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


 

EN-D

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


 

Mineral wool

  • To EN 13501, fire rating class A2, non-combustible
  • RAL quality mark RAL-GZ 388
  • Biosoluble and hence hygienically safe according to the German TRGS 905 (Technical Rules for Hazardous Substances) and EU directive 97/69/EG

Información técnica

  • Function
  • Technik
  • Quick sizing
  • Specification text
  • Order code
en

Functional description

The volume flow controller is a mechanical self-powered unit and works without external power supply. A damper blade with low-friction bearings is adjusted by aerodynamic forces such that the set volume flow rate is maintained within the differential pressure range.

The aerodynamic forces of the airflow create a closing torque on the damper blade. The bellows extends and increases this force while at the same time acting as an oscillation damper. The closing force is countered by a leaf spring that unrolls over a cam plate. The shape of the cam plate is such that a change in the differential pressure leads to an adjustment of the damper blade in a way that the volume flow rate is maintained almost exactly.

Efficient commissioning

The volume flow rate setpoint value can be set quickly and easily using the pointer on the external scale; no measurements are required.

The advantage over flow adjustment dampers is that there is no need for repeat measurements or adjustments by an air conditioning engineer. 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 volume flow controllers. A mechanical self-powered controller reacts immediately and adjusts the damper blade such that the set constant volume flow rate is maintained.

en
en_1

 

Rectangular volume flow controllers for constant air volume systems, mechanical self-powered, without external power supply, suitable for supply or extract air, available in 19 nominal sizes.

Ready-to-commission unit consists of the casing containing a damper blade with low-friction bearings, bellows, external cam plate and leaf spring.

Volume flow controllers without actuators are factory set to a reference volume flow rate (customers can set the required volume flow rate on site).

Both ends suitable for the connection of air duct profiles.

Casing air leakage to EN 1751, class C (B + H ≤400, class B)

Special features

  • Volume flow rate can be set using an external scale; no tools required
  • High volume flow rate control accuracy
  • Any installation orientation
  • Correct operation even under unfavourable upstream or downstream conditions (1.5 B straight section required upstream and 0.5 B required downstream)

Materials and surfaces

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


 

EN-D

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


 

Mineral wool

  • To EN 13501, fire rating class A2, non-combustible
  • RAL quality mark RAL-GZ 388
  • Biosoluble and hence hygienically safe according to the German TRGS 905 (Technical Rules for Hazardous Substances) and EU directive 97/69/EG

Construction

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

Technical data

  • Nominal sizes: 200 × 100 to 600 × 600 mm
  • Volume flow rate range: 40 to 3360 l/s or 144 to 12096 m³/h
  • Volume flow rate control range: approx. 25 – 100 % of the nominal volume flow rate
  • Differential pressure: 50 – 1000 Pa
en

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Por favor mande su solicitud
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Contacto

Gracias por su mensaje.

Visual contact Visual contact

Su mensaje ha sido enviado correctamente, en breve será atendido.
En seguida nos pondremos en contacto con Vd.
Para información general sobre productos o servicios, por favor llamar al:
Tel.: +34 976 50 02 50 | Fax: +34 976 50 09 04