EN | TROX GmbH

Visual display of the damper blade position

Actuator for switching between setpoint values or steady operation

Unit with two controllers

Tested to VDI 6022

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

Mechanical system-powered, without external power supply
Suitable for supply and extract air
Correct operation, even under unfavourable upstream and downstream conditions (straight length required upstream 1.5 B, downstream 0.5 B)
Close tolerances on flow rate
Flow rate setting using pointer on external scale, scale accuracy approximately ± 4 %
Flow rate range 4 : 1
Damper blade shaft supported in bearings
Bellows also acts as an oscillation damper
Differential pressure range 50 to 1000 Pa
Independent of orientation
Damper blade mechanisms maintenance-free
Operating temperature range 10 to 50 °C

Simplified installation

The Type EN and END volume flow controllers are fitted with flanges on both ends. This ensures very low leakage at the joint.

Acoustic requirements

Depending on requirements, a TX silencer may be supplied to reduce the air-regenerated noise.(installed by others).

General information

Constructional features

Rectangular form, rigid frame Flanged at both ends, suitable for fitting System 30 connecting sections.

Casing

Casing and damper blade made of galvanised sheet steel.
Stainless steel leaf spring.
Polyurethane bellows
Plain bearings with PTFE coating

Nominal sizes

Nominal sizes from 400 × 30000 – 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

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
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

Actuators

For setpoint readjustment
24 VAC or 230 VAC power
Factory-fitted
Small footprint thanks to compact construction

Useful additions

TX silencer

-Suitable for EN/END controllers

– Casing in galvanised sheet steel

– Mineral wool lining conforming to DIN 4102, fire rating class A2, with RAL quality mark RAL-GZ 388, biodegradable as defined by TRGS 905 as well as EU directive 97/69/EC

– Mineral wool faced with glass-fibre fabric providing protection against erosion by air flow up to a maximum air velocity of 20 m/s, inert to fungal and bacterial growth

Air heater

– Suitable for EN/END controllers

– See leaflet 5/20/EN/... for dimensions and technical data

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
Acoustic cladding cannot be retrofitted

Technical information

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

Schematic illustration of the EN

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 volume flow controller is a mechanical self-powered unit and works without external power supply. A damper blade with lowfriction 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 within narrow 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.

Volume flow rate ranges and minimum differential pressure values 1/2

Nominal sizes	200 × 100 to 600 × 600 mm
Volume flow rate range	39 – 3500 l/s
Volume flow rate range	140 – 12600 m³/h
Volume flow rate control range	Approx. 25 to 100% of the nominal volume flow rate
Scale accuracy	± 4 %
Min. and max. differential pressure	50 – 1000 Pa
Operating temperature	10 – 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

			①	②	③	④
NS	qv [l/s]	qv [m³/h]	Air-regenerated noise [dB(A)]		Case-radiated noise
200 x 100	39	140	40	23	26	18
200 x 100	68	246	44	29	31	23
200 x 100	104	376	47	34	35	27
200 x 100	164	590	50	38	38	31
300 x 100	65	234	41	26	28	20
300 x 100	137	492	47	35	35	28
300 x 100	199	716	48	38	38	33
300 x 100	260	936	49	40	41	36
300 x 150	82	295	43	26	30	21
300 x 150	152	547	47	32	35	27
300 x 150	294	1059	49	36	40	33
300 x 150	460	1656	50	38	44	38
300 x 200	120	432	44	29	31	23
300 x 200	197	710	47	33	36	29
300 x 200	349	1257	49	37	42	36
300 x 200	515	1854	51	39	46	41
400 x 200	200	720	45	30	34	25
400 x 200	337	1213	47	33	39	31
400 x 200	585	2106	50	37	45	38
400 x 200	875	3150	53	40	49	43
500 x 200	180	648	47	29	34	23
500 x 200	271	977	48	30	37	27
500 x 200	554	1995	49	33	42	33
500 x 200	900	3240	50	36	45	38
600 x 200	225	810	48	28	36	25
600 x 200	381	1370	48	29	39	29
600 x 200	689	2480	48	32	43	34
600 x 200	1010	3636	49	33	45	37
400 x 250	200	720	44	28	32	23
400 x 250	333	1198	46	30	37	28
400 x 250	537	1932	48	33	41	33
400 x 250	885	3186	49	36	45	38
500 x 250	235	846	47	28	35	24
500 x 250	460	1655	47	30	39	29
500 x 250	815	2932	47	32	42	34
500 x 250	1190	4284	47	34	44	37
600 x 250	300	1080	47	29	37	26
600 x 250	499	1795	47	30	39	30
600 x 250	897	3231	47	32	43	35
600 x 250	1310	4716	47	34	45	37
400 x 300	310	1116	44	29	35	27
400 x 300	553	1992	47	33	41	33
400 x 300	902	3249	50	36	46	39
400 x 300	1280	4608	52	39	50	43
500 x 300	365	1314	47	30	38	28
500 x 300	535	1928	48	31	40	31
500 x 300	998	3593	48	33	44	36
500 x 300	1580	5688	49	35	47	39
600 x 300	350	1260	47	29	37	26
600 x 300	669	2409	47	30	41	31
600 x 300	1137	4094	47	32	43	35
600 x 300	1750	6300	47	34	46	39
400 x 400	400	1440	45	29	37	28
400 x 400	674	2425	47	33	42	34
400 x 400	1170	4212	50	37	48	41
400 x 400	1750	6300	53	40	52	46
500 x 400	360	1296	47	28	37	26
500 x 400	715	2574	48	31	42	32
500 x 400	1330	4787	49	34	46	38
500 x 400	1800	6480	50	36	48	41
600 x 400	450	1620	48	28	39	28
600 x 400	958	3448	48	30	43	34
600 x 400	1595	5741	48	32	47	38
600 x 400	2020	7272	49	33	48	40
500 x 500	470	1692	47	28	38	27
500 x 500	1143	4113	47	31	43	34
500 x 500	1882	6776	47	33	45	38
500 x 500	2380	8568	47	34	47	40
600 x 500	600	2160	47	29	40	29
600 x 500	1246	4487	47	31	44	35
600 x 500	2084	7503	47	32	47	39
600 x 500	2620	9432	47	34	48	40
600 x 600	700	2520	47	29	40	29
600 x 600	1948	7014	47	31	46	37
600 x 600	2921	10517	47	33	48	40
600 x 600	3500	12600	47	34	49	42

① EN, L_PA
② EN, L_PA1, with secondary silencer TX
③ EN, L_PA2
④ EN-D, L_PA3
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]
Δp_st _______________________ [Pa]

Air-regenerated noise

L_PA _______________________ [dB(A)]

Case-radiated noise

L_PA _______________________ [dB(A)]

EN	–	D	–	P1	/	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, Dimensions, Product details

Application

▪ Volume flow controller for constant air volume flow control

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

Product specific data EN

NS	B	H	B₁	B₂	H₁	H₂	kg
200 × 100	200	100	230	260	130	160	4
300 × 100	300	100	330	360	130	160	5
300 × 150	300	150	330	360	180	210	6
300 × 200	300	200	330	360	230	260	6
400 × 200	400	200	430	460	230	260	7
400 × 250	400	250	430	460	280	310	8
400 × 300	400	300	430	460	330	360	8,5
400 × 400	400	400	430	460	430	460	13
500 × 200	500	200	530	560	230	260	8,5
500 × 250	500	250	530	560	280	310	9
500 × 300	500	300	530	560	330	360	9,5
500 × 400	500	400	530	560	430	460	14,5
500 × 500	500	500	530	560	530	560	15,5
600 × 200	600	200	630	660	230	260	10
600 × 250	600	250	630	660	280	310	10,5
600 × 300	600	300	630	660	330	360	11,5
600 × 400	600	400	630	660	430	460	17
600 × 500	600	500	630	660	530	560	18
600 × 600	600	600	630	660	630	660	20

For construction with actuator, add 0.32 kg additionally.

Product specific data EN-D

NS	B	H	B₁	B₂	H₁	H₂	kg
200 × 100	200	100	230	260	130	160	6,5
300 × 100	300	100	330	360	130	160	8
300 × 150	300	150	330	360	180	210	9
300 × 200	300	200	330	360	230	260	10
400 × 200	400	200	430	460	230	260	12
400 × 250	400	250	430	460	280	310	13
400 × 300	400	300	430	460	330	360	14
400 × 400	400	400	430	460	430	460	18
500 × 200	500	200	530	560	230	260	14
500 × 250	500	250	530	560	280	310	14,5
500 × 300	500	300	530	560	330	360	15,5
500 × 400	500	400	530	560	430	460	20,5
500 × 500	500	500	530	560	530	560	22
600 × 200	600	200	630	660	230	260	15,5
600 × 250	600	250	630	660	280	310	16,5
600 × 300	600	300	630	660	330	360	18
600 × 400	600	400	630	660	430	460	23
600 × 500	600	500	630	660	530	560	25
600 × 600	600	600	630	660	630	660	27,5

For construction with actuator, add 0.32 kg additionally.

Bend, horizontal

The stated volume flow rate accuracy Δqv can only be achieved with a straight duct section of at least 1.5B upstream between any bend and the controller.

Installation and commissioning

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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EN

EN

FOR THE PRECISE CONTROL OF NORMAL TO HIGH CONSTANT VOLUME FLOWS

General information

Technical information

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

Variants, Dimensions, Product details

References

Downloads

product information

Print page EN

TROX Services

EN

FOR THE PRECISE CONTROL OF NORMAL TO HIGH CONSTANT VOLUME FLOWS

General information

Technical information

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

Variants, Dimensions, Product details

References

Downloads

product information

Print page EN

TROX Services

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