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VRS-M • Motorized Constant air volume control dampers

  • Circular
  • Galvanized steel
  • Motorized 24V or 230V
  • 50-1000Pa

Motorized CAV controllers for flow control at 2 constant air flows. The minimum and maximum flow can easily be set. To be used for controlling the airflow at a pressure between 50 and 1000 Pa.

Application

  • For flow control in ventilation and air conditioning systems at 2 set flow rates (Vmin-Vmax) with the following duct sizes and air volumes
    • Ø80: adjustable between 40 & 125 m³/h
    • Ø100: adjustable between 70 & 220 m³/h
    • Ø125: adjustable between 100 and 280 m³/h
    • Ø150: adjustable between 170 and 450 m³/h
    • Ø160: adjustable between 180 & 500 m³/h
    • Ø200: adjustable between 250 & 900 m³/h
    • Ø250: adjustable between 500 & 1500 m³/h
    • Ø315: adjustable between 800 & 2800 m³/h
    • Ø355: adjustable between 900 & 3200 m³/h
    • Ø400: adjustable between 1000 and 4500 m³/h
  • Accuracy: +/- 10% of the set air volume

Material

  • Galvanized steel housing
  • Aluminium regulation blade with piston and spring
  • Mechanism for positioning with scale for setting the minimum and maximum air flow

Composition

  • Round housing made out of laser welded galvanised steel in standard duct sizes according to DIN EN 12237
  • Airtight connection up to class D with EPDM rubber according to DIN EN 12237
  • Balanced self-regulating aluminium blade with PTFE bearing and piston to prevent oscillations
  • Adjustable scale
  • Servomotor 24V or 230V for Vmin - Vmax flow setting with mechanical end stops.

Technical data

  • Nominal voltage: AC / DC 24 V or AC 230 V
  • Nominal frequency: 50/60 Hz
  • Power consumption Ø80 - Ø250
    • In operation: 1.5 W @ nominal torque CM230-L / 0.5 W @ rated torque CM24-L
    • At rest: 1 W CM230-L / 0.2 W CM24-L
    • For measuring wires: 3 VA CM230-L / 1 VA CM24-L
    • Cable 1m, 3 x 0.75 mm²
  • Power consumption Ø315 - Ø400
    • In operation: 1.5 W @ rated torque LM230A / 1 W @ nominal torque LM24A
    • At rest: 0.5 W LM230A / 0.2 W LM24A
    • For measuring wires: 3,5 VA LM230A / 1,5 VA LM24A
    • Cable 1m, 3 x 0.75 mm²
  • Direction of rotation: depending on circuit CW or CCW
  • Manual shut-off protection: uncoupled locking mechanism with push button, self-resetting
  • Angle of rotation: limited on both sides by adjustable, mechanical end stops. The actuator is protected against overload, requires no limit switches and stops automatically when the end stop is reached
  • Torque CM-L: 2 Nm, Torque LM A: 5 Nm
  • Rotation time CM-L: 75 s / 90 °, Running time LM A: 150 s / 90 °
  • Noise level: max. 35 dB (A)
  • Designation position: mechanical, pluggable
  • Integrated magnet for manual operation (magnetic gear release)
  • Protection level: IP54 in every mounting position
  • Ambient temperature range of servomotor during operation: -30 ... 50 ° C

Mounting

  • Set minimum and maximum flow rates by setting the mechanical end stops of the servomotor according to the scale
  • To be inserted at both sides into a round duct and to be equipped with a silencer if necessary
  • Horizontal or vertical mounting

Accessories

  • Insulation shells available upon request

Text for tender

Copy
  • The regulation of the airflow of the duct network is done by means of motorized valves for constant air volume control for Vmin - Vmax switching. The round controlvalves are constructed from a galvanized steel laser welded tunnel in which an aluminum control valve with rotating blade is incorporated. It controls the airflow with a constant flow rate within an operating range between 50Pa and 1000Pa. The regulator is resistant to varying pressures in the duct and is provided with an airtight maintenance-free bearing made of PTFE. The air flow rate is preset at the factory, but can be adjusted manually. The calibrated scale outside the regulator allows very accurate adjustment of the flow. The valves are available in duct diameters 80, 100, 125, 150, 160, 200, 250, 315, 355 and 400. The control valves are mounted between 2 channels where a rubber double lip seal provides an air-tight connection to air-tightness class D with the duct.
  • Cairox Type VRS-M

Order example

  • VRS-M, 125, 24V

Explanation

VRS-M= Type of constant air valve

125 = Duct diameter

24V = With actuator CM24-L (24V)

Other available products

  • Stainless steel models available on request

Dimensions

VRS-M

ØD [mm]

L1 [mm]

L2 [mm]

A1 [mm]

B1 [mm]

80

79

140

40

158

105

100

99

170

40

158

105

125

124

170

40

158

105

150

149

240

40

158

105

160

159

240

40

158

105

200

199

240

40

158

105

250

249

240

40

158

105

315

314

225

60

158

105

355

354

295

60

158

105

400

398

295

60

158

105

Sound data

Øv [m/s]Q [m³/h]Lw [dB/Oct] - 100 PaLw(A)
63Hz125Hz250Hz500Hz1kHz2kHz4kHz8kHz
802.240373735333333282738
4.582494744413939333245
6.9125525148454444383749
1002.570403938363536302941
4.8135504845424140343346
7.1200545249474545393851
1252.3100414038363536302941
4.3190514946424140343246
6.3280545350474545393750
1402.7150434240383737313042
4.9270535147444342363448
7.2400565552494747413952
1502.4150434240383737313042
4.2270525046434141343347
6.3400565450474645393851
1602.5180444341393838323143
4.7340535148444342363448
6.9500575552494747403952
2002.2250454341393837313043
5.1575555350464444373650
8900---------
2502.8500484745434141353447
5.71000575552494746393852
8.51500---------
3152.9800484644413939323144
51400575552484645393751
7.82200---------
3552.5900504846434241353347
5.62000595753504847403953
93200---------
4002.21000504845424140333146
4.92200585652494746393752
8.43800---------
Øv [m/s]Q [m³/h]Lw [dB/Oct] - 250 PaLw(A)
63Hz125Hz250Hz500Hz1kHz2kHz4kHz8kHz
802.240394243444446414150
4.582515150494849444454
6.9125616057545353474658
1002.570434546464749444353
4.8135595754515049434255
7.1200636158555454484759
1252.3100454747484849444354
4.3190555453515151464556
6.3280636158555453474659
1402.7150474949495051464555
4.9270615956535151444357
7.2400656360575655494861
1502.4150474949495051454455
4.2270565654525252464657
6.3400646259565454484660
1602.5180485050505051464556
4.7340626056535151444357
6.9500666461585655494861
2002.2250515252515151454456
5.1575646258555353464559
8900686663605858525064
2502.8500545655555455494860
5.71000666461575555484761
8.51500706865626060535265
3152.9800555655545353464458
51400666460575554474660
7.82200716965626059535165
3552.5900575857565555494760
5.62000686662595756494762
93200737167646261555468
4002.21000585957565554474559
4.92200676561575554484661
8.43800737167646261555367
Øv [m/s]Q [m³/h]Lw [dB/Oct] - 500 PaLw(A)
63Hz125Hz250Hz500Hz1kHz2kHz4kHz8kHz
802.240464949505153484857
4.582585856555556515161
6.9125686663615959535265
1002.570495252535455505060
4.8135606058575758535263
7.1200706865626160545366
1252.3100525454545556504960
4.3190616159585758525263
6.3280646462616162575667
1402.7150535656565658525162
4.9270636361605960545465
7.2400727067646262565568
1502.4150545656565657525162
4.2270636260595859535264
6.3400656564626263575768
1602.5180555757575758535163
4.7340646462606060555465
6.9500727067646262565468
2002.2250575958585758525063
5.1575666664626262565667
8900757370676565585770
2502.8500616262616162565466
5.71000696867656464595869
8.51500777572686766605872
3152.9800626362616059535165
51400706967656464585769
7.82200777572696766605872
3552.5900646564636262555367
5.62000727169676666605971
93200797774716968626074
4002.21000656564626161545166
4.92200727168666565595770
8.43800797774706868616074

Symbols and specifications

  • Q [m³/h] = Air volume in m³/h
  • Ø = Duct diameter in mm
  • 100Pa, 250Pa of 500Pa = Static pressure in Pa
  • Lw (0m (int.)) = Generated sound power in the duct divided into dB per octave band at 0 m
  • Lw ext. duct L = 6m = The radiated sound of a duct with a length of 6 m expressed as Lw in dB

Radiated sound data

ØΔLw [dB/Oct] - non insulated duct
63Hz125Hz250Hz500Hz1kHz2kHz4kHz8kHz
803633322317121111
1003432302216121110
1252929312421191511
1402728272118141210
150252523191412119
16023232018111098
20022191616151198
25019161312121098
31518141213111188
35517121111101077
4001711101010976
         
ØΔLw [dB/Oct] - insulated duct (25mm)
63Hz125Hz250Hz500Hz1kHz2kHz4kHz8kHz
803935393532333429
1003835383431333428
1253533373632333627
1402929323232333326
1502827303029323225
1602726282927313125
2002318232629292924
2502318202426302824
3152217192327292824
3552015182226282723
4001914172225282723
         
ØΔLw [dB/Oct] - insulated duct (50mm)
63Hz125Hz250Hz500Hz1kHz2kHz4kHz8kHz
804237454647545647
1004138464547545747
1253536424851605845
1403130374245525444
1503029364144515444
1602928354044515444
2002622293742515343
2502520263541505242
3152618263842515345
3552317243540495142
4002016233339485040

LW2 = LW - ΔLW
LW2 = Case radiated noise in dB
LW = Sound power given for the frequencies f[Hz] from 63 up to 8000 Hz
ΔLW = Correction values for case radiated noise in dB

Wiring diagram

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