Technical brochure Variable volume flow controller VRFvent Rectangular For special ventilation and air conditioning applications (e.g. hospitals and laboratories)

Technical brochure - Variable volume flow controller VRFvent, rectangular LTG ventilation technology Air-water systems Contents page Device view, application, measuring principle, advantages 4 Materials, surfaces, accessories, special 5 versions, connection, design, areas of application, control accuracy, installation recommendations Volume flow ranges, minimum pressure differences 7 Airborne sound transmission 8 Structure-borne sound radiation 9 Radiation calculation example 10 Radiation calculation example 11 Nomenclature, ordering code 12 Controller components makes 13 The dimensions in this...

Technical brochure - Variable volume flow controller VRFvent, rectangular Basics of volume flow control - which product for which application? System types Variable volume flow Constant volumetric flow In systems with variable volumetric flow (VAV), electronic volumetric flow controllers work to supply each room with the exact amount of air it requires - in line with demand and in an energy-efficient manner. In systems with constant volumetric flow (KVS), volumetric flow controllers are used that mechanically and automatically maintain a constant volumetric flow. As they do not require any wiring...

Technical brochure - Variable volume flow controller VRFvent, rectangularDevice viewApplication The VRFvent volume flow controller was developed for use in rectangular air ducts. It regulates volume flows electronically as a fixed value or variable setpoint, regardless of the inlet pressure in the air duct. The housing cross-sections match the recommended edge lengths for rectangular air ducts in accordance with DIN EN 1505, making it possible to select the largest possible flow cross-section even in confined installation conditions. The volume flow control is designed for air velocities between...

Technical brochure - Variable volume flow controller VRFvent, rectangularMaterials, surfaces - Housing, flap and axle: Galvanised steel - Measuring strips: Aluminium - Damper bearing: POM plastic - Gaskets: EPDM - 40 mm thick insulating shell made of mineral wool with 1 mm sheet steel casing, can be retrofitted without tools - Silencer matching the cross-section - Bus-compatible controllers Information and wiring diagrams for volume flow control can be found in the operating and maintenance instructions. - Pressure losses of the damper up to 500 Pa - If the sound radiation via the surface of...

Technical brochure - Variable volume flow controller VRFvent, rectangularDimensions, Masses Bf Front view without insulation shell 300 * Side view from left, without insulation shell L Front view with insulation shell Side view from left, with insulating shell L * Space required for access to the controller components .../B680, B681, B690, B672, B692. Width B © LTG Aktiengesellschaft, GrenzstraRe 7, 70435 Stuttgart, Germany Tel. +49 711 82010, Fax +49 711 8201-720, [email protected], www.LTG.de Previous editions are invalid. Subject to technical changes.

Technical brochure - Variable volume flow controller VRFvent, rectangularVolume flow ranges, Minimum pressure differences Width B V - Volume flow rate Vmjn - Minimum volume flow= Lower control limit Vnominal-Nominal volume flow Apmin- minimum pressure loss © LTG Aktiengesellschaft, GrenzstraRe 7, 70435 Stuttgart, Germany Tel. +49 711 82010, Fax +49 711 8201-720, [email protected], www.LTG.de Previous editions are invalid. Subject to technical changes.

Technical brochure - Variable volume flow controller VRFvent, rectangularAirborne sound Radiation Width B [mm] Aptotal- total pressure difference fm - Centre frequency of the octave band Lw - Sound power level Lwa - Sound power level, A-weighted LpA - Sound pressure level, A-weighted The conversion to other sizes is carried out at the same throttle point from air velocity and pressure loss using the AL values in the following table. The values refer to the same nominal height H. © LTG Aktiengesellschaft, GrenzstraRe 7, 70435 Stuttgart, Germany Tel. +49 711 82010, Fax +49 711 8201-720, [email protected],...

Technical brochure - Variable volume flow controller VRFvent, rectangularStructure-borne sound - Radiation Width B [mm] Aptotal- total pressure difference fm - Centre frequency of the octave band Lw - Sound power level Lwa - Sound power level, A-weighted LpA - Sound pressure level, A-weighted The conversion to other sizes is carried out at the same throttle point from air velocity and pressure loss using the AL values in the following table. The values refer to the same nominal height H. © LTG Aktiengesellschaft, GrenzstraRe 7, 70435 Stuttgart, Germany Tel. +49 711 82010, Fax +49 711 8201-720,...

Technical brochure - Variable volume flow controller VRFvent, rectangularEstimation of the sound pressure level in the room due to the throw noise of the controller (without airregenerated noise of the air diffusers) Insertion loss splitter silencer type SDF-SM (optional, taken into account in table on page 8) A-weighted total sound pressure level L(pA) = © LTG Aktiengesellschaft, GrenzstraRe 7, 70435 Stuttgart, Germany Tel. +49 711 82010, Fax +49 711 8201-720, [email protected], www.LTG.de Previous editions are invalid. Subject to technical changes.

Technical brochure - Variable volume flow controller VRFvent, rectangularEstimation of the sound pressure level in the room due to radiated noise from the controller fm Calculation example Radiation Given: VRFvent 500 x 200 with acoustic cladding Vmax= 1440 m3/h, corresponds to 4 m/s Apges= 150 Pa Requested: Sound pressure level LpAin the room due to radiated noise from the controller © LTG Aktiengesellschaft, GrenzstraRe 7, 70435 Stuttgart, Germany Tel. +49 711 82010, Fax +49 711 8201-720, [email protected], www.LTG.de Previous editions are invalid. Subject to technical changes.

Technical brochure - Variable volume flow controller VRFvent, rectangularNomenclature, Order code VRFvent / ... x ... / S / D / B 681 (1) (2) (3) (4) (5) (6) (7) (1) Series VRFvent = Rectangular volume flow controller = Width x height [mm] (see page 6) = Galvanised steel = coated, RAL 9010 (on request) = Stainless steel V4A (on request) = with insulating shell = without insulation shell = Belimo = Sauter = Gruner = Belimo LMV-D3W-E-MF (up to installation height 200 mm) = Belimo LMV-D3W-E-MP (up to installation height 200 mm) = Belimo NMV-D3W-E-MP = SauterASV215BF152E = SauterASV215BF132E = Sauter...