00132140_0
CAV controller variant VFC, with rotary knob


00132715_0
Tested to VDI 6022


00131800_0
Actuator with potentiometers


00134669_0
Actuator with mechanical stops


00136822_0
Variant with rotary knob


00132140_0
00132715_0
00131800_0
00134669_0
00136822_0

VFC 

For low airflow velocities

Circular mechanical self-powered volume flow controllers for the control of supply air or extract air in constant air volume systems with low airflow velocities

  • Suitable for airflow velocities from 0.8 m/s
  • Very simple commissioning
  • Volume flow rate can be set using a rotary knob and a scale on the outside of the casing
  • Simple retrofit of an actuator for variable volume flows
  • Any installation orientation; maintenance-free
  • Casing air leakage to EN 1751, class C


Optional equipment and accessories

  • Circular silencer Type CA or CF for the reduction of air-regenerated noise
  • Hot water heat exchanger Type WL and electric air heater Type EL for reheating the airflow
  • Actuator for variable volume flows or for qvmin - qvmax switching

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    Application

    Application

    • Circular CAV controllers of Type VFC 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
    • For low airflow velocities
    • Simplified project handling with orders based on nominal size

    Special features

    • Volume flow rate can be set using an external scale; no tools required
    • Simple retrofit of an actuator is possible
    • Correct operation even under unfavourable upstream or downstream conditions (1.5 D straight section required upstream)
    • Any installation orientation
    • Aerodynamic function testing of each unit on a special test rig prior to shipping

    Nominal sizes

    • 80, 100, 125, 160, 200, 250

    Description

    Parts and characteristics

    • Ready-to-commission controller
    • Damper blade with low-friction bearings
    • Bellows that acts as an oscillation damper
    • Leaf spring
    • Rotary knob with pointer for setting the volume flow rate
    • Lip seal

    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

    Useful additions

    • Secondary silencer Type CA or CF
    • Heat exchanger Type WL
    • Electric air heater Type EL

    Construction features

    • Circular casing
    • Spigot with lip seal, for circular connecting ducts to EN 1506 or EN 13180
    • Damper blade with low-friction bearings and special bellows

    Materials and surfaces

    • Casing made of galvanised sheet steel
    • Damper blade and other parts made of high-quality plastic, to UL 94, V1; to DIN 4102, material classification B2
    • Leaf spring made of stainless steel
    • Polyurethane bellows

    Standards and guidelines

    • Hygiene conforms to VDI 6022
    • Casing air leakage to EN 1751, class C

    Maintenance

    • Maintenance-free as construction and materials are not subject to wear

    Technical information

    Function, TECHNICAL DATA, QUICK SIZING, SPECIFICATION TEXT, ORDER CODE, Produktbeziehungen

    • Function
    • TECHNICAL DATA
    • QUICK SIZING
    • SPECIFICATION TEXT
    • ORDER CODE
    Schematic illustration of the VFC 00132975_0
    ① Damper blade
    ② Leaf spring
    ③ Volume flow rate scale
    ④ Rotary knob locking screw
    ⑤ Rotary knob
    ⑥ Lip seal
    ⑦ Diagram with setting values
    ⑧ Bellows inlet


    Functional description

    The volume flow controllers work without an external power supply.

    A damper blade with low-friction bearings is adjusted by aerodynamic forces such that a 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. As the differential pressure changes, the leaf spring adjusts the position of the damper blade such 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 sizes

    80 – 250 mm

    Volume flow rate range

    6 – 370 l/s or 22 – 1332 m³/h

    Volume flow rate control range

    Approx. 10 – 100 % of the nominal volume flow rate

    Volume flow rate accuracy

    Approx. ± 10 % of the nominal volume flow rate

    Minimum differential pressure

    30 Pa

    Maximum differential pressure

    500 Pa

    Operating temperature

    10 – 50 °C


    Quick sizing tables provide a good overview of the room sound pressure levels that can be expected. Approximate intermediate values can be interpolated. Precise intermediate values and spectral data can be calculated with our Easy Product Finder design programme.

    The first selection criteria for the nominal size are the actual volume flow rates Vmin and Vmax. 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 is required.

    VFC, Sound pressure level at differential pressure 50 Pa

    Nominal size V Air-regenerated noise Case-radiated noise
    Nominal size V ① ② ③ ④ ①
    Nominal size V LPA LPA1 LPA2
    Nominal size l/s m³/h dB(A)

    80

    6

    22

    25

    <15

    <15

    <15

    <15

    80

    10

    36

    28

    16

    <15

    <15

    <15

    80

    20

    72

    33

    21

    <15

    <15

    <15

    80

    42

    151

    39

    27

    18

    16

    17

    100

    6

    22

    29

    15

    <15

    <15

    <15

    100

    15

    54

    33

    20

    <15

    <15

    15

    100

    30

    108

    37

    26

    18

    17

    18

    100

    65

    234

    41

    33

    26

    25

    21

    125

    10

    36

    22

    <15

    <15

    <15

    <15

    125

    20

    72

    27

    16

    <15

    <15

    <15

    125

    45

    162

    34

    25

    18

    16

    <15

    125

    100

    360

    41

    34

    29

    27

    16

    160

    18

    65

    25

    16

    <15

    <15

    <15

    160

    45

    162

    32

    24

    18

    16

    18

    160

    85

    306

    36

    29

    24

    22

    22

    160

    185

    666

    41

    35

    30

    28

    27

    200

    25

    90

    27

    16

    <15

    <15

    <15

    200

    60

    216

    31

    22

    16

    <15

    18

    200

    120

    432

    35

    27

    21

    19

    22

    200

    250

    900

    37

    30

    25

    24

    26

    250

    37

    133

    31

    21

    <15

    <15

    18

    250

    100

    360

    35

    25

    18

    16

    22

    250

    185

    666

    36

    28

    21

    19

    25

    250

    370

    1332

    37

    29

    23

    22

    29

    ① VFC

    ② VFC with secondary silencer CF, insulation thickness 50 mm, length 500 mm

    ③ VFC with secondary silencer CF, insulation thickness 50 mm, length 1000 mm

    ④ VFC with secondary silencer CF, insulation thickness 50 mm, length 1500 mm


    Circular volume flow controllers for constant and variable air volume systems with low airflow velocities, mechanical self-powered, without external power supply, suitable for supply or extract air, available in 6 nominal sizes.

    Ready-to-commission unit consists of the casing containing a damper blade with low-friction bearings, bellows, leaf spring, and a rotary knob to set the volume flow rate setpoint.

    Differential pressure: 30 – 500 Pa

    Volume flow rate: max. 10 : 1

    Spigot with lip seal, for circular connecting ducts to EN 1506 or EN 13180.

    Casing air leakage to EN 1751, class C.

    Special features

    • The Volume flow rate can be set using an external scale; no tools required
    • Simple retrofitting of an actuator is possible
    • Correct operation even under unfavourable upstream or downstream conditions (1.5 D straight section required upstream)
    • Any installation orientation
    • Aerodynamic functional testing of each unit on a special test rig before prior to shipping

    Materials and surfaces

    • Casing made of galvanised sheet steel
    • Damper blade and other parts made of high-quality plastic, to UL 94, V1; to DIN 4102, fire rating class B2
    • Leaf spring made of stainless steel
    • Polyurethane bellows

    Technical data

    • Nominal sizes: 80 to 250 mm
    • Volume flow rate range: 6 to 370 l/s or 22 to 1332 m³/h
    • Volume flow rate control range: approx. 10 – 100 % of the nominal volume flow rate
    • Volume flow rate accuracy: approx. ± 10 % of the nominal volume flow rate
    • Minimum differential pressure: 30 Pa
    • Maximum differential pressure: 500 Pa

    Sizing data

    • qv [m³/h]
    • Δpst [Pa]

    Air-regenerated noise

    • LPA [dB(A)]

    Case-radiated noise

    • LPA [dB(A)]

    This specification text describes the general properties of the product. Texts for variants can be generated with our Easy Product Finder design programme.

    Life cycle assessment
    A life cycle assessment is available for the product series in form of an Environmental Product Declaration (EPD) that has been checked and published by a programme holder.

    00131326_0

     Type
    VFC       Volume flow controller

    		 

     Nominal size [mm]
    80, 100, 125, 160, 200, 250

     Actuator
           No entry: manual adjustment

    E01       24 V AC/DC, 3-point (min/max), potentiometer
    E03       24 V AC/DC, modulating 0 – 10 V DC, potentiometer
    M01       24 V AC/DC, 3-point (min/max), mechanical stops

    Order example: VFC/100/E03

    Nominal size [mm]

    100

    Actuator

    Variable volume flow, 24 V AC/DC, potentiometer, control signal 0 to 10 V DC


     

    Variants, Attachments, Dimensions and weight, Product details

    • Variants
    • ATTACHMENTS
    • Dimensions and weight
    • Product details
    CAV controller variant VFC, with rotary knob
    00132140_0


    00132140_0
    00132130_0
    00132134_0

    VFC, actuators

    Order code detail Actuator Supply voltage Auxiliary switch

    Min/Max actuators




    E01

    Actuator with potentiometers TROX/Gruner

    24 V AC/DC

    –

    E02

    Actuator with potentiometers TROX/Gruner

    230 V AC

    –

    M01

    Actuator with mechanical stops TROX/Belimo

    24 V AC/DC

    –

    M02

    Actuator with mechanical stops TROX/Belimo

    230 V AC

    –

    Modulating actuators




    E03

    Actuator with potentiometers TROX/Gruner

    24 V AC/DC

    –


    Anbauteile: VARYCONTROL Regelkomponenten

    ☒ Regel- größe Schnittstelle Vmin -/ Vmax - Verstellung Differenzdruck- transmitter Stellantrieb Fabrikat LVC TVR TVJ TVT TZ-S TA-S TVZ TVA TVM TVRK TVLK





















    Easyregler

    Dynamisch













    Easy

    V

    Integriert

    Integriert

    ①

    ●

    ●

    ●

    ●

    ●

    ●

    ●

    ●




    Compactregler

    Dynamisch













    BC0

    V

    MP-Bus

    Integriert

    Integriert

    ②

    ●

    ●

    ●

    ●

    ●

    ●

    ●

    ●


    BF0

    V

    MP-Bus

    Integriert

    Integriert

    ②








    ●

    BL0

    V

    LonWorks

    Integriert

    Integriert

    ②

    ●

    ●

    ●

    ●

    ●

    ●

    ●


    BM0

    V

    Modbus

    Integriert

    Integriert

    ②











    BM0-J6

    V

    Modbus und steckerfertiger Anschlussleitung

    Integriert

    Integriert

    ②











    XG0

    V

    Integriert

    Integriert

    ③








    ●

    XB0

    V

    Integriert

    Integriert

    ③

    ●

    ●

    ●

    ●

    ●

    ●

    ●


    LN0

    V

    Integriert

    Integriert

    ⑤

    ●

    ●

    ●

    ●

    ●

    ●

    ●


    LK0

    V

    KNX


    ⑤











    LY0

    V

    Integriert

    Integriert

    ⑤








    ●



    Compactregler

    Statisch













    SA0

    V

    Integriert

    Integriert

    ④











    SC0

    Δp

    Integriert

    Schnelllaufender Stellantrieb integriert

    ④













    Universalregler

    Dynamisch













    B11

    V

    Integriert

    Stellantrieb, Drehmoment für TVT

    ②



    ●






    B13

    V

    Integriert

    Stellantrieb

    ②

    ●

    ●

    ●

    ●

    ●

    ●


    B27

    V

    Integriert

    Stellantrieb

    ②








    ●

    B1B

    V

    Integriert

    Federrücklaufantrieb

    ②

    ●

    ●

    ●

    ●

    ●

    ●

    ●


    XC3

    V

    Integriert

    Federrücklaufantrieb

    ③

    ●

    ●

    ●

    ●

    ●

    ●

    ●




    Universalregler

    Statisch













    BP1

    V

    MP-Bus

    Separates Bauteil

    Stellantrieb, Drehmoment für TVT

    ②



    ●






    BP3

    V

    MP-Bus

    Separates Bauteil

    Stellantrieb

    ②

    ●

    ●

    ●

    ●

    ●

    ●

    ●

    ●

    BPB

    V

    MP-Bus

    Separates Bauteil

    Federrücklaufantrieb

    ②

    ●

    ●

    ●

    ●

    ●

    ●

    ●

    ●

    BPG

    V

    MP-Bus

    Separates Bauteil

    Schnelllaufender Stellantrieb

    ②

    ●

    ●

    ●

    ●

    ●

    ●

    ●

    ●

    ●

    BB1

    V

    Separates Bauteil

    Stellantrieb, Drehmoment für TVT

    ②



    ●






    BB3

    V

    Separates Bauteil

    Stellantrieb

    ②

    ●

    ●

    ●

    ●

    ●

    ●

    ●

    ●

    BBB

    V

    Separates Bauteil

    Federrücklaufantrieb

    ②


    ●

    ●

    ●

    ●

    ●

    ●

    ●

    XD1

    V

    Integriert

    Stellantrieb

    ③

    ●

    ●

    ●

    ●

    ●

    ●

    ●

    ●

    XD3

    V

    Integriert

    Federrücklaufantrieb

    ③

    ●

    ●

    ●

    ●

    ●

    ●

    ●

    ●

    BR1

    Δp

    MP-Bus

    100 Pa

    Stellantrieb, Drehmoment für TVT

    ②



    ●






    BR3

    Δp

    MP-Bus

    100 Pa

    Stellantrieb

    ②

    ●

    ●

    ●

    ●

    ●

    ●

    ●

    BRB

    Δp

    MP-Bus

    100 Pa

    Federrücklaufantrieb

    ②

    ●

    ●

    ●

    ●

    ●

    ●

    ●

    ●

    BRG

    Δp

    MP-Bus

    100 Pa

    Schnelllaufender Stellantrieb

    ②

    ●

    ●

    ●

    ●

    ●

    ●

    BS1

    Δp

    MP-Bus

    600 Pa

    Stellantrieb, Drehmoment für TVT

    ②



    ●






    BS3

    Δp

    MP-Bus

    600 Pa

    Stellantrieb

    ②

    ●

    ●



    ●

    ●

    BSB

    Δp

    MP-Bus

    600 Pa

    Federrücklaufantrieb

    ②

    ●

    ●

    ●




    ●

    BSG

    Δp

    MP-Bus

    600 Pa

    Schnelllaufender Stellantrieb

    ②

    ●

    ●

    ●




    ●

    BG1

    Δp

    100 Pa

    Stellantrieb, Drehmoment für TVT

    ②



    ●






    BG3

    Δp

    100 Pa

    Stellantrieb

    ②

    ●

    ●

    ●

    ●

    ●

    ●

    ●

    BGB

    Δp

    100 Pa

    Federrücklaufantrieb

    ②

    ●

    ●

    ●

    ●

    ●

    ●

    ●

    ●

    BH1

    Δp

    600 Pa

    Stellantrieb, Drehmoment für TVT

    ②



    ●






    BH3

    Δp

    600 Pa

    Stellantrieb

    ②

    ●

    ●





    ●

    BHB

    Δp

    600 Pa

    Federrücklaufantrieb

    ②

    ●

    ●

    ●




    ●

    XE1

    Δp

    Integriert, 100 Pa

    Stellantrieb

    ③

    ●

    ●

    ●

    ●

    ●

    ●

    ●

    ●

    XE3

    Δp

    Integriert, 100 Pa

    Federrücklaufantrieb

    ③

    ●

    ●

    ●

    ●

    ●

    ●

    ●

    ●

    XF1

    Δp

    Integriert, 600 Pa

    Stellantrieb

    ③

    ●

    ●

    ●




    ●

    XF3

    Δp

    Integriert, 600 Pa

    Federrücklaufantrieb

    ③

    ●

    ●

    ●




    ●

    ① TROX, ② TROX/Belimo, ③ TROX/Gruner, ④ Sauter, ⑤ Siemens

    ☒ Bestellschlüsseldetail, V Volumenstrom, Δp Differenzdruck


    Anbauteile: VARYCONTROL Regelkomponenten

    ☒ Regel- größe Schnittstelle Vmin -/ Vmax - Verstellung Differenzdruck- transmitter Stellantrieb Fabrikat


    Easylabregler

    Statisch

    Elab

    RS, RE, PC, C

    TCU3

    Integriert

    Schnelllaufender Stellantrieb

    Elab

    RS, PC, C

    TCU3

    Integriert

    Schnelllaufender Stellantrieb

    Elab

    RE, PC, C

    TCU3

    Integriert

    Schnelllaufender Stellantrieb

    Elab

    RS, RE, PC, FH, C

    TCU3

    Integriert

    Schnelllaufender Stellantrieb


    Elektronischer Regler

    Statisch

    Elektronischer Regler

    TMA

    RS, RE, PC

    TCU-LON-II mit LonWorks-Schnittstelle

    Integriert

    Schnelllaufender Stellantrieb

    TMB

    RS, RE, PC

    TCU-LON-II mit LonWorks-Schnittstelle

    Integriert

    Schnelllaufender Stellantrieb (bürstenloser Motor)

    TMA

    RS, RE,

    TCU-LON-II mit LonWorks-Schnittstelle

    Integriert

    Schnelllaufender Stellantrieb

    TMB

    RS, RE,

    TCU-LON-II mit LonWorks-Schnittstelle

    Integriert

    Schnelllaufender Stellantrieb (bürstenloser Motor)

    TMA

    RE ,PC

    TCU-LON-II mit LonWorks-Schnittstelle

    Integriert

    Schnelllaufender Stellantrieb

    TMB

    RE ,PC

    TCU-LON-II mit LonWorks-Schnittstelle

    Integriert

    Schnelllaufender Stellantrieb (bürstenloser Motor)

    TMA

    RS, RE ,PC, FH

    TCU-LON-II mit LonWorks-Schnittstelle

    Integriert

    Schnelllaufender Stellantrieb

    TMB

    RS, RE ,PC, FH

    TCU-LON-II mit LonWorks-Schnittstelle

    Integriert

    Schnelllaufender Stellantrieb (bürstenloser Motor)
























































    XF3

    Δp

    Integriert, 600 Pa

    Federrücklaufantrieb

    ③

    BB3

    V

    Separates Bauteil

    Stellantrieb

    ②

    ① TROX, ② TROX/Belimo, ③ TROX/Gruner, ④ Sauter, ⑤ Siemens

    ☒ Bestellschlüsseldetail, V Volumenstrom, Δp Differenzdruck


    VFC
    00188248_0


    00188248_0
    00188255_0
    00188261_0


    VFC system 00137034_0
    ① CAV controller with rotary knob
    ② Actuator E0* with potentiometers
    ③ Actuator M0* with mechanical stops


    Installation details, Basic information and nomenclature

    • Installation details
    • Basic information and nomenclature
    Bend
    00137278_0

    A bend with a curvature radius of at least 1D – without an additional straight duct section upstream of the CAV controller – has only a negligible effect on the volume flow rate accuracy.


    00137278_0
    00136019_0
    00149821_0

    Installation and commissioning

    • Any installation orientation
    • Take the adjustment value from the characteristic on the sticker (on each volume flow controller)
    • Volume flow rate setpoint can be set on external scale

    Upstream conditions

    The volume flow rate accuracy ΔV 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. Some installation situations require straight duct sections upstream.

    Free air intake only with a straight duct section of 1D 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.

    Space required

    Attachments ① ② ③
    Attachments mm

    Without actuator

    200

    200

    200

    With actuator E0*

    200

    200

    300

    With actuator M0*

    200

    200

    230


    Definition of noise
    00136089_0
    ① Air-regenerated noise
    ② Case-radiated noise


    00136089_0
    00136092_0

    Prinipal dimensions

    ØD [mm]

    Outer diameter of the spigot

    L [mm]

    Length of unit including connecting spigot

    L₁ [mm]

    Length of casing or acoustic cladding

    m [kg]

    Weight

    Acoustic data

    fm [Hz]

    Octave band centre frequency

    LPA [dB(A)]

    A-weighted sound pressure level of air-regenerated noise of the CAV controller, system attenuation taken into account

    LPA1 [dB(A)]

    A-weighted sound pressure level of air-regenerated noise of the VAV terminal unit with secondary silencer, system attenuation taken into account

    LPA2 [dB(A)]

    A-weighted sound pressure level of case-regenerated noise of the VAV terminal unit, system attenuation taken into account

    qvnom [m³/h] and [l/s]

    Nominal volume flow rate (100 %)

    • The value depends on product type and nominal size
    • Values are published on the internet and in technical leaflets, and stored in the Easy Product Finder design software.
    • Upper limit of the setting range and maximum volume flow rate setpoint value for the CAV controller

    qv [m³/h] and [l/s]

    Volume flow rate

    ΔV [± %]

    Volume flow rate accuracy in relation to setpoint (tolerance)

    Δpst [Pa]

    Static differential pressure

    Δpst min [Pa]

    Static differential pressure, minimum

    • The static minimum differential pressure is equal to the pressure loss of the CAV controller when the damper blade is open, caused by flow resistance (bellows, crossbar)
    • If the pressure on the CAV controller is too low, the setpoint volume flow rate may not be achieved, not even when the damper blade is open
    • Important factor in designing the ductwork and in rating the fan including speed control
    • Sufficient duct pressure must be ensured for all operating conditions and for all controllers, and the measurement point or points for speed control must have been selected accordingly to achieve this

    Galvanised sheet steel

    • Casing made of galvanised sheet steel
    • Parts in contact with the airflow as described for the product type
    • External parts, e.g. mounting brackets or covers, are usually made of galvanised sheet steel

    Downloads

    product information

    • Product Data Sheet Retrofit Kits

      Retrofit+kits_PD_2020_02_11_DE_en Product Data Sheet 590 KB pdf

    • Product data sheet Type VFC

      VFC_PD_2022_12_07_DE_en Product data sheet 580 KB pdf

    certificates

    • Certificate concerning statistical leakage tests

      LC_v1_2024_10_DE_en Certificate  660 KB pdf

    • Declaration of conformity or declaration of incorporation Type VFC

      Declaration of conformity or declaration of incorporation 93 KB pdf

    • Declaration of conformity or declaration of incorporation Type VFC

      Declaration of conformity or declaration of incorporation 66 KB pdf

    • Declaration of hygiene conformity VFC

      VFC_HC_2024_05_DE_en Hygiene certificate  2,2 MB pdf

    operation manuals

    • Operating manual VFC

      VFC_OM_M_VFC_EN3_2021_09_GB_en Operating manual 3,6 MB pdf

    TROX Services

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