Technical Documentation Flow rate controllers type VRF-W (short) LTG Aktiengesellschaft 70435 Stuttgart, Grenzstraße 7, Germany Tel. +49 711 8201-0, Fax +49 711 8201-720 [email protected] www.LTG-AG.com 105 Corporate Drive, Suite E Spartanburg S.C. 29303, USA Tel. +1 864 599-6340, Fax +1 864 599-6344 [email protected] www.LTG-INC.net Via Matilde Serao 5, 20144 Milano (MI), Italia Tel. +39 02 9550535, Fax +39 02 9550828 [email protected] www.LTG-SRL.com

Flow rate controllers type VRF-W (short) Air-Water Systems Content Page View of unit, application, measuring principle, 3 Materials, finishes, accessories, special 4 versions, connection, selection, application ranges, control accuracy, installation Flow rates, minimum pressure differences 6 Airborne sound transmission 7 without sound absorber Airborne sound transmission 8 with sound absorber Casing radiation without insulating case 9 Casing radiation with insulating case 10 Sample calculation sound transmission 11 Sample calculation radiation 12 Specification and schedule of prices Dimensions...

The Innovation Company LTG Aktiengesellschaft Flow rate controllers type VRF-W (short) View of unit Casing leakage meets DIN EN 1751 Class C and damper leakage Class 3 requirements (optional Class 4). All flow rate controllers are suitable for use with limit differential pressures of up to -750 Pa and +1000 Pa based on ambient pressure conditions. Measuring principle The flow rate is determined using two pressure-integrating measuring probes inside the duct casing. The measuring front probe determines the total pressure and the rear probe measures static pressure inside the jetlike damper-accelerated...

The Innovation Company LTG Aktiengesellschaft Flow rate controllers type VRF-W (short) Materials, finishes Application ranges and limits - Minimum air speed 1 m/s - Nominal air speed 10 m/s - Maximum air speed in the free case section 12 m/s with specific factory-set adjustment - Static over-pressure in the air duct up to 1000 Pa (Pressure Class 2, DIN EN 1507) - Static under-pressure in the air duct based on ambient pressure -750 Pa max. (tightness Class C, DIN/BS EN 1507) - Leakage flow rate via shut damper blade (standard version) Class 3 (optional Class 4) acc. to DIN/BS EN 1751 - Leakage...

The Innovation Company LTG Aktiengesellschaft Flow rate controllers type VRF-W (short) Dimensions, weights LAntrieb Without Insulation case With Insulation case Excess length LAntrieb [mm] E LTG Aktiengesellschaft Grenzstraße 7 70435 Stuttgart Deutschland Tel. +49 711 8201-0 Fax +49 711 8201-720 [email protected] www.LTG-AG.com Printed in Germany · Former editions are invalid · Subject to technical modifications Height with insulation HDS [mm]

The Innovation Company LTG Aktiengesellschaft Flow rate controllers type VRF-W (short) Flow rates, minimum pressure differences At 1 m/s Width B [mm] Legend V Vmin Vnenn ∆pmin - Flow rate Minimum flow rate = lower limit of control Nominal flow rate Minimum pressure loss E LTG Aktiengesellschaft Grenzstraße 7 70435 Stuttgart Deutschland Tel. +49 711 8201-0 Fax +49 711 8201-720 [email protected] www.LTG-AG.com Printed in Germany · Former editions are invalid · Subject to technical modifications

The Innovation Company LTG Aktiengesellschaft Flow rate controllers type VRF-W (short) Airborne sound transmission without sound absorber ∆pges = 500 Pa Sum Conversion to other model sizes is realized at the same throttle point of air speed and pressure loss using the ∆L values from the following chart. The values are applicable to the associated unit height H. LWA = LWA Chart + ∆L LW Okt = LW Chart + ∆L Legend ∆pges - Total pressure diff. - Octave mid-band fm frequency - Sound power level LW LWA - Sound power level, A-weighted LpA - Sound pressure level, A-weighted Reverberation room E LTG Aktiengesellschaft...

The Innovation Company LTG Aktiengesellschaft Flow rate controllers type VRF-W (short) Airborne sound transmission with sound absorber ∆pges = 500 Pa The values on which the attenuation is based are applicable to an active silencer length of 1000 mm. Conversion to other model sizes is realized at the same throttle point of air speed and pressure loss using the ∆L values from the following chart. The values are applicable to the associated unit height H. LWA = LWA Chart + ∆L LW Okt = LW Chart + ∆L Legend ∆pges - Total pressure diff. - Octave mid-band fm frequency - Sound power level LW LWA - Sound...

The Innovation Company LTG Aktiengesellschaft Flow rate controllers type VRF-W (short) Casing radiation without insulating case Conversion to other model sizes is realized at the same throttle point of air speed and pressure loss using the ∆L values from the following chart. The values are applicable to the associated unit height H. LWA = LWA Chart + ∆L LW Okt = LW Chart + ∆L Height H [mm] Controller and air duct without insulating case Reverberation room Flow rate controller Total pressure difference Octave mid-band frequency Sound power level Sound power level, A-weighted Sound power level,...

The Innovation Company LTG Aktiengesellschaft Flow rate controllers type VRF-W (short) Casing radiation with insulating case Conversion to other model sizes is realized at the same throttle point of air speed and pressure loss using the ∆L values from the following chart. The values are applicable to the associated unit height H. LW Okt = LW Chart + ∆L LWA = LWA Chart + ∆L Height H [mm] Controller and air duct with insulating case Reverberation room Flow rate controller Total pressure difference Octave mid-band frequency Sound power level Sound power level, A-weighted Sound power level, A-weighted...

The Innovation Company LTG Aktiengesellschaft Flow rate controllers type VRF-W (short) Room sound pressure level calculation from controller sound transmission (excluding flow noise from the air diffusers) Insertion sound attenuation for the splitter attenuator type SDF-SM (optional, included in chart on page 8) fm System attenuation according to VDI 2081 fm Deflection Room attenuation Outlet reflection Branching attenuation for distributing the sound power over multiple rooms, Vroom = 540 m³/h V Sample calculation sound transmission Given: VRF-W 500 x 200 with silencer type SDF-SM Vmax = 1440...