TYPE EN

For the precise control of normal to 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 12,600 m³/h or 3,500 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 tested to EN 1751, class C
  • Visual display of 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 of Type WT for reheating the airflow
  • Actuator for switching between setpoint values or steady operation
Volume flow controller Type EN 00136149_0


  • Application
  • DESCRIPTION
  1. Application

  • Rectangular CONSTANTFLOW CAV controllers of Type EN for supply air / extract air volume 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 setpoint can be set from outside by rotary knob
  • High control accuracy of the set volume flow
  • Any installation orientation
  • Correct operation even under unfavourable upstream conditions
  • Visual display of 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: 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


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
  • Rotary knob with pointer and scale for setting the volume flow setpoint value
  • Aerodynamic functional testing of each unit on a special test rig prior to shipping
  • Visual display of damper blade position for operating point optimisation

Construction

  • Min/Max actuators: Actuators for switching between minimum and maximum volume flow rate setpoint values
  • Modulating actuators: Actuators for the infinite adjustment of volume flow rates or to switch between minimum and maximum volume flow rate setpoint values
  • EN with actuator only up to H = 300 mm


Parts and characteristics

  • 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
  • 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 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/EC


Standards and guidelines
  • Casing air leakage tested to EN 1751, class C
  • Hygiene conforms to VDI 6022

Nominal sizes

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


Technical information

FUNCTION, TECHNICAL DATA, QUICK SIZING, SPECIFICATION TEXT, ORDER CODE, RELATED PRODUCTS

  • 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)

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 expand and increase 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. As a result, the volume flow rate remains constant withinnarrow tolerances.


 


Efficient commissioning


The volume flow rate setpoint value can be set quickly and easily using the rotary knob 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 during commissioning. If the system pressure changes, e.g. by opening or closing a string when using flow adjustment dampers, the volume flow rates in the entire system changes. This is not the case with the use of mechanically independent volumetric 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 – 600 × 600 mm
Volume flow rate range39 – 3500 l/s or 140 – 12600 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 to 50 °C


Quick sizing tables provide a good overview of the room sound pressure levels that can be expected. The first selection criteria for the nominal size are the actual volume flow rates qᵥmin and qᵥmax. Intermediate values can be interpolated. Precise results and spectral data can be calculated with our Easy Product Finder design programme. The quick sizing tables are based on generally accepted attenuation levels. If the sound pressure level exceeds the required level, a larger air terminal unit and/or a silencer or acoustic cladding are required.




EN, sound pressure level at differential pressure 150 Pa


NSqv [l/s]qv [m³/h]Air-regenerated noise [dB(A)]Case-radiated noise
200 x 1003914040232618
200 x 1006824644293123
200 x 10010437647343527
200 x 10016459050383831
300 x 1006523441262820
300 x 10013749247353528
300 x 10019971648383833
300 x 10026093649404136
300 x 1508229543263021
300 x 15015254747323527
300 x 150294105949364033
300 x 150460165650384438
300 x 20012043244293123
300 x 20019771047333629
300 x 200349125749374236
300 x 200515185451394641
400 x 20020072045303425
400 x 200337121347333931
400 x 200585210650374538
400 x 200875315053404943
500 x 20018064847293423
500 x 20027197748303727
500 x 200554199549334233
500 x 200900324050364538
600 x 20022581048283625
600 x 200381137048293929
600 x 200689248048324334
600 x 2001010363649334537
400 x 25020072044283223
400 x 250333119846303728
400 x 250537193248334133
400 x 250885318649364538
500 x 25023584647283524
500 x 250460165547303929
500 x 250815293247324234
500 x 2501190428447344437
600 x 250300108047293726
600 x 250499179547303930
600 x 250897323147324335
600 x 2501310471647344537
400 x 300310111644293527
400 x 300553199247334133
400 x 300902324950364639
400 x 3001280460852395043
500 x 300365131447303828
500 x 300535192848314031
500 x 300998359348334436
500 x 3001580568849354739
600 x 300350126047293726
600 x 300669240947304131
600 x 3001137409447324335
600 x 3001750630047344639
400 x 400400144045293728
400 x 400674242547334234
400 x 4001170421250374841
400 x 4001750630053405246
500 x 400360129647283726
500 x 400715257448314232
500 x 4001330478749344638
500 x 4001800648050364841
600 x 400450162048283928
600 x 400958344848304334
600 x 4001595574148324738
600 x 4002020727249334840
500 x 500470169247283827
500 x 5001143411347314334
500 x 5001882677647334538
500 x 5002380856847344740
600 x 500600216047294029
600 x 5001246448747314435
600 x 5002084750347324739
600 x 5002620943247344840
600 x 600700252047294029
600 x 6001948701447314637
600 x 60029211051747334840
600 x 60035001260047344942

EN, LPA
EN, LPA1, with secondary silencer TX
EN, LPA2
EN-D, LPA3
The sound power levels for calculating the sound pressure levels were measured in the TROX laboratory according to DIN EN ISO 5135 – see "Basic information and nomenclature".

 










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. The volume flow controllers are factory-adjusted and preset to reference volume flow rate. Sound power level measured according to DIN EN ISO 5135. Meets the hygiene requirements according to VDI 6022.


Special characteristics


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


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 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/EC


Construction

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


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 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/EC


Technical Data

  • Nominal sizes: 200 × 100 to 600 × 600 mm
  • Volume flow rate range:  39 – 3500 l/s or 140 – 12600 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
  • Casing air leakage to EN 1751, class C


Sizing data

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

 

 

Air-regenerated noise

 

 

  • LPA _______________________ [dB(A)]

 

 

Case-radiated noise

 

 

  • LPA _______________________ [dB(A)]

 

 

 

 

 


EN DP1 / 400 × 200 / E01

|
|
|
|
|

1
2
3
4
5


1 Type
EN
Volume flow controller

2 Acoustic cladding
No entry: none

D
With acoustic cladding

3 Material
No entry: galvanised sheet steel

P1
Powder-coated RAL 7001, silver grey

4 Nominal size [mm]
B × H

5 Actuator
No entry: none

E01
24 V AC/DC, 3-point (Min/Max), potentiometer
E02
230 V AC, 3-point (Min/Max), potentiometer
E03 24 V AC/DC, modulating 0–10V DC, potentiometer


 

 

 

 


VARIANTS, PRODUCT DETAILS

  • VARIANTS
  • DIMENSIONS
  • PRODUCT DETAILS

  • Volume flow controller for constant air volume flow control
  • Volume flow controller with acoustic cladding for constant air volume flow control
  • For rooms where the case-radiated noise of the unit is not sufficiently reduced by a false 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

NSBHB₁B₂H₁H₂kg
200 × 1002001002302601301604
300 × 1003001003303601301605
300 × 1503001503303601802106
300 × 2003002003303602302606
400 × 2004002004304602302607
400 × 2504002504304602803108
400 × 3004003004304603303608,5
400 × 40040040043046043046013
500 × 2005002005305602302608,5
500 × 2505002505305602803109
500 × 3005003005305603303609,5
500 × 40050040053056043046014,5
500 × 50050050053056053056015,5
600 × 20060020063066023026010
600 × 25060025063066028031010,5
600 × 30060030063066033036011,5
600 × 40060040063066043046017
600 × 50060050063066053056018
600 × 60060060063066063066020
,
NSBHB₁B₂H₁H₂kg
200 × 1002001002302601301606,5
300 × 1003001003303601301608
300 × 1503001503303601802109
300 × 20030020033036023026010
400 × 20040020043046023026012
400 × 25040025043046028031013
400 × 30040030043046033036014
400 × 40040040043046043046018
500 × 20050020053056023026014
500 × 25050025053056028031014,5
500 × 30050030053056033036015,5
500 × 40050040053056043046020,5
500 × 50050050053056053056022
600 × 20060020063066023026015,5
600 × 25060025063066028031016,5
600 × 30060030063066033036018
600 × 40060040063066043046023
600 × 50060050063066053056025
600 × 60060060063066063066027,5
Installation and commissioning
  • Vertical air ducts: CAV-Controller in any installation orientation
  • Horizontal air ducts: CAV-Controller must be installed so that the operating side is positioned to the side (right/left) or below
  • Volume flow rate setpoint can be set from outside by rotary knob
  • Loosen and lock the rotary knob with hexagonal socket screw
  • No repeat measurements or adjustments required during commissioning
  • EN-D: For constructions with acoustic cladding, ducts on the room side should have cladding up to the acoustic cladding of the controller


Upstream conditions
The volume flow rate accuracy Δq
v applies to a straight upstream section of the duct. Bends, junctions or a narrowing or widening of the duct cause turbulence that may affect measurement. Duct connections, e.g. branches off the main duct, must comply with EN 1505. Free air intake only with a straight duct section of 1.5B or 1,5H upstream.

 


Space required for commissioning and maintenance


Sufficient space must be kept clear near any attachments to allow for commissioning and maintenance. It may be necessary to provide sufficiently sized inspection access openings.


 


 


 


 


 

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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