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SCHAKOVolumetric flow controllerVRAQ Leakage air flow with control damper closed according to DIN EN 1751, up to class 4 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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08/61 - 2 Construction subject to change. Version: 13.03.2020 No return possible!

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Volumetric flow controller VRAQ 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 VRAQ All volumetric flow controllers can be assembled with horizontal or vertical damper axis.

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Volumetric flow controller VRAQ Construction Housing - Galvanised sheet steel (-SV) - Galvanised sheet steel with DD coating inside (-DD) (only available for VRAQ-HKP and VRAQ-HKU) Damper leaf seal - made of PUR, silicone-free - for airtight sealing design to DIN EN 1751 Damper bearing - Brass (VRAQ H=100) - Plastic (VRAQ-HKP and VRAQ-JK-LP) - Sintered (VRAQ-HKU and VRAQ-JK-LU) Blades - Opposed, made of galvanised steel sheet, not air-tight (VRAQ-HKP and VRAQ-HKU) - opposed, made of extruded aluminium profiles, air-tight sealing to DIN 1751. (VRAQ-JK-LP and VRAQ-JK-LU) Measuring cross -...

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Volumetric flow controller VRAQ Models and dimensions DimensionsLouvre profileVRAQ-HKP / VRAQ-HKU H = 100-180 / W = 140-565 with electric controller VRAQ-...-DS0, without acoustic cladding VRAQ-JK-LP / VRAQ-JK-LU 40 mm thick sound-absorbing material is pressed to 35 mm, with sheet metal casing H = 100-180 / W = 140-565 with pneumatic controller not available Available sizes x = available -- = not available ca. = approx. All combined lengths and heights available. The VRAQ is only delivered in right-hand design. If the left-hand design, with the controller and motor on the left, is required,...

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with pneumatic controller VRAQ-...-DS0, without acoustic cladding Volumetric flow controller VRAQ H = 201-1003 / W = 201-1003 with electric controller VRAQ-...-DS0, without acoustic cladding VRAQ-...-DS4, with acoustic cladding 40mm VRAQ-...-DS4, with acoustic cladding 40mm 40 mm thick sound-absorbing material is pressed to 35 mm, with sheet metal casing 40 mm thick sound-absorbing material is pressed to 35 mm, with sheet metal casing Available sizes VRAQ-HKU-... / VRAQ-HKP-... x = available -- = not available All combined lengths and heights available. S* = Projection length with a damper...

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Volumetric flow controller VRAQStandard controller selection with electric controller (standard): Construction subject to change.

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Volumetric flow controller VRAQ Damper blade leakage VRAQ, classification according to DIN EN 1751 Construction subject to change.

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Volumetric flow controller VRAQAccessories - dimensions Mineral wool silencer (-ZSQ) with baffles MWK-OB Available sizes and insertion loss for mineral wool silencer (-ZSQ) H“ (mm) 100 140 160 180 201 225 252 318 357 400 449 503 565 634 711 797 894 1003 The possible width and height combinations are listed on page 7. Please note! The parameters KA (number of baffles), K (baffle strength ) and Mineral wool silencer ZSQ must be ordered separately! S (gap width ) depend on the width B. Construction subject to change.

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Volumetric flow controller VRAQ Technical data Information for parameterisation Attention, the following specifications are important for the programming of the volumetric flow controllers: - this table specifies the complete measuring range of the standard controller (volumetric flow range). - If the customer absolutely wants a calibration curve different from 12 m/s, it must be specified! - When the air volume drops below the Vmin shown in the chart, the correct functioning of the volumetric flow controller is no longer guaranteed! - If only one air volume is specified in the order (as...

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with electric controller (standard) H (mm) - MIN values refer to air velocity of 1 m/s - MAX values refer to air velocity of 12 m/s H=318 for VRAQ-JK-LP / VRAQ-JK-LU not available. -- = not available Construction subject to change.

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Volumetric flow controller VRAQ Acoustic data VRAQ H= 100-180 / W= 140-565 A-weighted sound power level LWA [dB(A)]Flow generated noiseH (mm) 100 140 160 vk (m/s) 12 12 12 140 49 Lwa [dB(A Radiated noise VRAQ-...-DS0 (without acoustic cladding) 08/61 - 13 Construction subject to change.

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Volumetric flow controller VRAQRadiated noise VRAQ-...-DS4 (with acoustic cladding)08/61 - 14 Version: 13.03.2020 Construction subject to change.

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Volumetric flow controller VRAQAcoustic data VRAQ H= 201-1003 / W= 201-1003 Inflow area A (m2) Construction subject to change.

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Volumetric flow controller VRAQ Technical data of the control components Measured value collection and control function The measured value collection is carried out via a flow-favouring double measuring cross. The measuring openings are distributed over the measuring cross according to the median line method. The pressure differential formed on the measuring cross is determined by means of a dynamic or static measuring sensor. The measured values are averaged to give an average value which represents a measuring quantity for the volumetric flow. The controller compares the actual value...

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Volumetric flow controller VRAQ MP bus activation with integrated switch Circuit diagrams Circuit diagram electric controller (standard) Compact controller Belimo make: LMV-D3-MP / NMV-D3-MP / SMV-D3-MP VAV with analogue command signal VAV with lock (CLOSED) Mode 2-10 V DC Cable designations Lock mode (CLOSED) In the 2...10 V mode, the following function can be carried out with a 0...10 V signal: Contact closed, function active Contact closed, function active, in mode 2 ...10 V only Contact open * not available for DC 24 V supply Construction subject to change.

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