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SCHAKOVolumetric flow controllerVRAR Leakage air flow with control damper closed according to DIN EN 1751, up to class 3 Ferdinand Schad KG SteigstraBe 25-27 D-78600 Kolbingen Telephone +49 (0) 74 63 - 980 - 0 Fax +49 (0) 74 63 - 980 - 200 info@schako.de schako.com

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08/60 - 2 Construction subject to change. Version: 30.03.2020 No return possible!

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Volumetric flow controller VRAR Description A volumetric flow controller is used for pressure-independent volumetric flow regulation in ventilation and air-conditioning systems. It is used to keep the volumetric flow constant (CAV) within specified limits or to control it variably (VAV) as a function of a command variable, for example a room temperature controller, DDC or bus system. For constant volumetric flows, the operating stages CLOSED/Vmin/Vmid/Vmax/OPEN are available in stage operation, controlled via relays or switches. The housing, measuring sensor, control flap, PI controller...

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Volumetric flow controller VRAR All volumetric flow controllers can be assembled with horizontal or vertical damper axis. Field of application - for supply and return air systems - for constant CAV or variable VAV installations. - for positive control Vmin, Vmid, Vmax, “OPEN" or "CLOSED" - For volumetric flow and linear pressure control - in the differential pressure range 50 - 1,000 Pascal - at ambient temperatures 0 ...+...50 °C, requirement: measuring air 0...+ +50 °C/5...95% rH, non-condensing - with command signal 0...10 V DC, 2...10 V DC, via MP bus (Belimo) or Lon, Modbus, KNX,...

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Volumetric flow controller VRAR Construction Housing - Galvanised sheet steel (-SV) - Galvanised sheet steel with DD coating inside (-DD) - Stainless steel 1.4301 (-V2) or 1.4571 (-V4) Damper blade - Galvanised sheet steel (-SV) - Stainless steel 1.4301 (-V2A) or 1.4571 (-V4A) Damper leaf seal - made of PUR, silicone-free - for airtight sealing design to DIN EN 1751 Damper bearing - Brass Measuring cross - Extruded aluminium profile (for stainless steel design with DD coating) Measuring cross support - Plastic (PA6) Model VRAR-... - round design, for spiral duct connection to DIN EN 1506,...

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Volumetric flow controller VRAR Models and dimensions Dimensions with electric controller VRAR-...-DS0, without acoustic cladding with pneumatic controller VRAR-...-DS0, without acoustic cladding Available sizes VRAR-... Construction subject to change.

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Volumetric flow controller VRAR Accessories - dimensions Rubber lip seal (-GD1), on both sides Detail X Flat flange (-FF1/-FF2, pair), on both sides according to DIN 24 154/5 Please note! Duct silencers must be ordered separately! For further information, see duct silencer RS documentation. Available sizes flat flange (-FF1/-FF2)

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Volumetric flow controller VRAR Insertion loss Duct silencer (-RS-N) RS-N-...-50/100, L1=500, without central baffle RS-N-...-50/100, L1=1450, without central baffle RS-N-...-50/100, L1=950, without central baffle Version: 30.03.2020 Construction subject to change. No return possible!

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Volumetric flow controller VRARTechnical data Volumetric flow range VRAR-A..., with electric controller NW (mm) VRAR-A..., with pneumatic controller Attention, the following specifications are important for the programming of the volumetric flow controllers: - this table merely specifies the complete measuring range of the controller (volumetric flow range) - If the customer absolutely wants a calibration curve different from 12 m/s, it must be specified! Once it is approved by the competent department, it can be adjusted correspondingly. - When the air volume drops below the Vmin shown in...

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Volumetric flow controller VRAR Static minimum pressure difference VRAR-A..., with electric controller Construction subject to change.

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