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, up to 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 of Type WT for reheating the airflow
  • Actuator for switching between setpoint values

Volume flow controller Type EN 00136149_0
  • 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 characteristics

  • 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 conditions (1.5 B straight section required upstream)

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
  • EN with actuator only up to H = 300 mm

Useful additions

  • Secondary silencer Type TX
  • Heat exchanger Type WT

Construction features

  • Rectangular casing
  • Flanges on both sides, suitable for duct connection
  • Volume flow controllers from H = 400 mm are fitted with two damper blades and two volume flow rate scales

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


Powder-coated construction (P1)

  • Casing and damper blade made of galvanised sheet steel, powder-coated


Variant with acoustic cladding (-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 A1, 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

Technical information

  • Function
  • Technical data
  • Quick sizing
  • Specification text
  • Order code
Schematic illustration of the EN 00131435_0

① Volume flow rate scale

② Volume flow rate scale lock

③ Crossbar

④ Cam plate

⑤ Leaf spring

⑥ Bellows inlet

⑦ Bellows

⑧ Damper blade

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.

Nominal sizes200 × 100 to 600 × 600 mm
Volume flow rate range40 – 3360 l/s or 144 – 12096 m³/h
Volume flow rate control rangeApprox. 25 to 100 % of the nominal volume flow rate
Scale accuracy± 4 %
Minimum differential pressure50 Pa
Maximum differential pressure1000 Pa
Operating temperature10 – 50 °C


Quick sizing: Sound pressure level at differential pressure 150 Pa

Nominal sizeVVAir-regenerated noiseAir-regenerated noiseCase-radiated noiseCase-radiated noise
Nominal sizeVV
Nominal sizeVVLPALPA1LPA2LPA3
Nominal sizel/sm³/hdB(A)dB(A)dB(A)dB(A)
200 × 100 40 144 351921<15
200 × 100 80 288 41282821
200 × 100 120 432 44343326
200 × 100 160 576 46383530
300 × 100 65 234 38222416
300 × 100 130 468 44303224
300 × 100 195 702 45353629
300 × 100 260 936 47383932
300 × 150 105 378 41242819
300 × 150 210 756 44313426
300 × 150 315 1134 46353932
300 × 150 420 1512 47384135
300 × 200 130 468 45243121
300 × 200 260 936 46293526
300 × 200 390 1404 46333829
300 × 200 520 1872 47354032
400 × 200 210 756 42233020
400 × 200 420 1512 43273526
400 × 200 630 2268 44313830
400 × 200 840 3024 44334033
500 × 200 230 828 40212818
500 × 200 460 1656 40263324
500 × 200 690 2484 41293628
500 × 200 920 3312 42313831
600 × 200 255 918 38202717
600 × 200 510 1836 39243123
600 × 200 765 2754 39283527
600 × 200 1020 3672 40313731
400 × 250 220 792 44233222
400 × 250 440 1584 45283727
400 × 250 660 2376 45313930
400 × 250 880 3168 45344133
500 × 250 300 1080 41213121
500 × 250 600 2160 42263627
500 × 250 900 3240 43303930
500 × 250 1200 4320 43334133
600 × 250 320 1152 40203020
600 × 250 640 2304 40253425
600 × 250 960 3456 41283729
600 × 250 1280 4608 42313932
400 × 300 315 1134 45255325
400 × 300 630 2268 46294030
400 × 300 945 3402 47344334
400 × 300 1260 4536 47364536
500 × 300 375 1350 43223423
500 × 300 750 2700 44283829
500 × 300 1125 4050 44314132
500 × 300 1500 5400 45334335
600 × 300 420 1512 41213322
600 × 300 840 3024 42263728
600 × 300 1260 4536 42304031
600 × 300 1680 6048 43324234
400 × 400 420 1512 47273929
400 × 400 840 3024 49324434
400 × 400 1260 4536 49364737
400 × 400 1680 6048 50384940
500 × 400 460 1656 45243727
500 × 400 920 3312 46294232
500 × 400 1380 4968 47334435
500 × 400 1840 6624 47354637
600 × 400 510 1836 43223625
600 × 400 1020 3672 44274030
600 × 400 1530 5508 44314333
600 × 400 2040 7344 45334536
500 × 500 600 2160 47264030
500 × 500 1200 4320 48314535
500 × 500 1800 6480 49354839
500 × 500 2400 8640 49375041
600 × 500 640 2304 45243928
600 × 500 1280 4608 46294333
600 × 500 1920 6912 46324636
600 × 500 2560 9216 46354839
600 × 600 840 3024 46264131
600 × 600 1680 6048 47304636
600 × 600 2520 9072 48354939
600 × 600 3360 12096 48375142

① EN

② EN with secondary silencer TX

③ EN-D


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 ducts.

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

Special characteristics

  • 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 conditions (1.5 B straight section required upstream)

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


Powder-coated construction (P1)

  • Casing and damper blade made of galvanised sheet steel, powder-coated


Variant with acoustic cladding (-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 A1, 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
  • Minimum differential pressure: 50 Pa
  • Maximum differential pressure: 1000 Pa

00134835_0

 Type
EN       Volume flow controller

 Acoustic cladding
       No entry: none
D       With acoustic cladding

 Material
       No entry: galvanised sheet steel
P1       Powder-coated (RAL 7001), silver grey

 

 Nominal size [mm]
       B × H

 Actuator
       No entry: without
       For example
B50       24 V AC/DC, 3-point
B52       24 V AC/DC, 3-point, with auxiliary switch
B70       24 V AC/DC, modulating 2 – 10 V DC

 Volume flow rates [m3/h or l/s]
       only actuators
       Vmin – max for factory setting

 

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For general question regarding products or services you can also call:
Tel.: +7 495 221-5161 | Fax: +7 495 221-5171