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VFR
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for the adjustment of volume flow rates

Contents · Description Description __________________________________ Type VFR – The System ________________________ Construction · Dimensions ______________________ Leakage flow rate ____________________________ VFR with hand wheel TROX type VFR dampers are used to adjust volume flow rates in air-conditioning and ventilation systems. They can be used in circular ventilation ducts with nominal sizes 80 to 250 and system pressures up to 1000 Pa. The damper blade is designed without a seal and with a circumferential gap between the case and blade tip of approximately 3 mm. For the flow rate...

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Type VFR – The System There are 3 configurations of the type VFR damper: • Manual operation • Actuator with potentiometers (E01, E02) • Actuator with mechanical stops (M01, M02) On each VFR, a diagram label is shown in order to determine the settings on site (example nominal size 125). Adjustment scale Diagram label Actuator with potentiometers (E01, E02) Actuator with mechanical stops (M01, M02) Hand wheel

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Construction · Dimensions Characteristics – – – – – – – For adjustment of flow rates and pressures Circular construction in 10 nominal sizes Manual adjustment Stepless adjustment of the damper blade from 0 to 10 Maximum system pressure 1000 Pa Damper blade mechanism maintenance-free Operating temperature: 10 to 50 °C Construction features Mechanical stops Keep clear to provide access for operation Adjustment with potentiometers Keep clear to provide access to actuator Adjustment with hand wheel 15 – Spigot connection with lip seal for circular connecting ducts according to EN 1506 or EN...

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Construction · Dimensions · Leakage flow rate Materials – Casing in galvanised sheet steel – Hand wheel, damper blade and bearings made of plastic flame retardant (V0) according to UL 94 Closed blade (0) leakage flow rate Adjustment with mechanical stops 232 Keep clear to provide access to actuator

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Nomenclature · Quick selection Nomenclature LPA in dB(A) : A-weighted sound pressure level of air-regenerated noise, including a 5 dB system attenuation in l/s or m³/h : Flow rate in Pa : Total differential pressure All sound pressure levels are based on 20 µPa. All noise levels determined in a reverberation chamber. Flow rate Sound pressure level LpA in dB(A)

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Min/max changeover Actuator with potentiometers Actuator 24 V (E01) Supply voltage: Service button Potentiometer Indicator light Actuator with mechanical stops Power rating: Control signal: Protection level: Actuator 230 V AC (E02) Supply voltage: 230 V AC ± 20 %, 50/60 Hz Power rating: 3 VA Control signal: 1- or 2-wire control Protection level: IP 42 Functional testing – Press service button – Actuator turns towards MIN – Actuator turns towards MAX – Actuator returns to control mode Indicator light provides functional information – Permanently on: Position set – Blinking once a second:...

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Order Details Specification text Circular damper in 10 nominal sizes for the adjustment of flow rates in air-conditioning and ventilation systems, can be used with system pressures up to 1000 Pa. Consists of the casing with damper blade and the hand wheel for stepless adjustment. Spigot connection with lip seal for circular connecting ducts according to EN 1506 or EN 13180. Casing air leakage complies with EN 1751, class B. Casing in galvanised sheet steel. Hand wheel, damper blade and bearings made of plastic flame retardant (V0) according to UL 94. Order code / asing Galvanised steel, no...

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