lindab | constant -/variabWe reserve the right to make changes without - PDF document

lindab | constant -/variabWe reserve the
lindab | constant -/variabWe reserve the right to make changes without prior notice5953Constant-/variable flow damperDAVUConstant flow damper with electric motor for continuous setting of one flowr, which facilitates balancingof ventilation systems and gives correct flow from the start.Tightness class across closed blade 802461221,950 1002461222,000 1252461352,250 1602461702,450 2002462102,860 2502842603,950 3153343255,3501301Order codeProductDAVU12524LMSXDimension Ød–+YDC 0–10 VDC 2–10 VTechnical data for the motorLM 24 A-SXPower supply..............................AC 19,2–28,8 V, 50/60 HzDC 21,6–28,8 VPower consumption....................2 WFor wire sizing............................4 VAConnection.................................Cable 1 m, 4×0,75 mmOperating angle..........................Max. 95°, adjustable 0–100 %Torque at nominal voltage..........Min. 5 NmDirection of rotation....................Switch selectable 0/1Position at Y=0 V........................Switch selectable 0 or 1 Position indication.......................MechanicalRunning time for 90° ..................150 sSound power level......................35 dB (A)Protection class..........................III Safety extra-low voltageProtection type.....

.......................IP 54Ambient temp
.......................IP 54Ambient temperature range........-30 to +50 °CAmbient humidity........................95 % RHDAVUconstant -/variable flow dampers1Technical dataDAU, DA2EU, DAVUWe reserve the right to make changes without prior notice601Technical dataPressure and flow ranges and sound to the surroundings30 40 50 75 100 220 125 150 175 200 200 300 500 600 700 q
pt v LWA200 250 300 350 300 400 800 1000 1200 q
pt v LWA400 500 600 400 600 800 1000 2000 q
pt v L400 500 600 700 800 1000 1500 2500 q
pt v LWAconstant -/variable flow dampers13Technical dataDAU, DA2EU, DAVU600We reserve the right to make changes without prior noticeTechnical dataPressure and flow ranges and sound to the surroundingsThe graphs show A-weighted sound power level, L [dB], to the surroundings.Given: Diameter125 mmFlow 70 l/sPressure drop 200 PaA-weighted sound power level approx. 40 dBThe A-weighted sound pressure level in the mittle of theroom becomes approx. 8 dB lower than these graph values.With insulation shell around the unit (the DALU unit) the A-weighted sound pressure level in the mittle of the roombecomes appox. 26 dB lower than the graph values on con-dition that also the connected ducts are attenuated (insu-lated) to the same

extent.Still lower sound pressure level
extent.Still lower sound pressure level can be achieved with addi-tional constructional sound attension measures (false ceil-ing, high room attenuation). 405060701520100150250q
pt L40506070809095100150250300
pt L405060708090100150165200300500
pt LWAlindab | le flow dampersWe reserve the right to make changes without prior noticeTechnical dataDAU, DA2EU, DAVUTechnical dataSound to duct [dB], to duct in octave bands 1…8, 63…8000 Hz, as function of diameter, pressure drop and flow.Pressure dropopVelocity app. 9 [m/s]Velocity app. 12 [m/s]Centre frequency [Hz] Centre frequency [Hz] 631252505001k2k4k8k631252505001k2k4k8kFlow 45 [l/s]Flow 70 [l/s]1000500200100585959595859585355565555545554505051515150515045––––––––––––––––616465656363615759616262606059555558595957575551––––––––––––––––Flow 70 [l/s] Flow 95 [l/s]10010005002001006162616261626156565857575657565151525151505150464748474746474642––––––––626465656363625859606161596058545355565654545349––––––––––––––––Flow 110 [l/s]Flow 165 [l/s]12510005002001006667676766676661616262626162615654555555545554495051505049504945––––––––687171727070686463666667656563595759606058585752––––––––––––––––Flow 180 [l/s]Flow 220 [l/s]16010005002001006970696968696864636463636263625855565656555655505051

505049504945––––––––70717171707169656466
505049504945––––––––7071717170716965646666666465645956585858575756525152525251525046––––––––Flow 280 [l/s]Flow 360 [l/s]20010005002001007071717170717065646564646364635956575656555655515051505049504945––––––––7173737372727167656767676566656057585959575856525153535352525147––––––––Flow 450 [l/s]Flow 600 [l/s]25010005002001007172717170717066656665656465646057585757565756525152525251525146––––––––7273747472737167666869696767666258606161595958545455565654555349––––––––Flow 700 [l/s]Flow 830 [l/s]31510005002001007172727271727166666766666566656158595959585958535253535352535247––––––––727373737273716766676768666766615960606059605854––––––––––––––––598We reserve the right to make changes without prior noticeconstant -/variable flow dampers13Technical dataDAU, DA2EU, DAVUTechnical dataSound to duct [dB], to duct in octave bands 1…8, 63…8000 Hz, as function of diameter, pressure drop and flow.Pressure dropopVelocity app. 2,5 [m/s]Velocity app. 6 [m/s]Centre frequency [Hz] Centre frequency [Hz]631252505001k2k4k8k631252505001k2k4k8kFlow 15 [l/s]Flow 30 [l/s]1000500200100514944444649494445433838404343383735303032353530323025252730302526241919212424195656535353555550515149494951504645454343434544404141393939414035––––––––Flow 20 [l/s] Flow 45 [

l/s]100100050020010056534848505354484946
l/s]1001000500200100565348485053544849464141434747423937313133373732343126262832322726241818202424195959575757595853545451515153534847474444454746414242393940424136–––––––– Flow 30 [l/s] Flow 70 [l/s]1251000500200100605852525458585354524646485252474644383840444439403832323438383334322626283232276464626262646359595956575759585352524949495151464646444444464540–––––––– Flow 40 [l/s] Flow 120 [l/s]1601000500200100625952525559605456534747495354484946393942464741434033333640413537342727303435296767656565676661616159595961605553535151515352474848464646484742–––––––– Flow 70 [l/s] Flow 180 [l/s]2001000500200100666357575963635859565050535757525047414143474742434034343640403537342828303434296969666666686863626260606062615754545151525453484747454545474642–––––––– Flow 110 [l/s] Flow 300 [l/s]25010005002001006764595961656560605751515357575250474141434747424340343436404035353226262832332770706768676969646363616161636257555553535354544949494747474848434343404140424237 Flow 170 [l/s] Flow 470 [l/s]3151000500200100696660606266676161585252545859535047414144484843424034343640403535322626293333287070686868706965646462626264635956565454545655505050474747494944––––––––constant -/variable flow dampers1Technical dataDAU, DA2EU, DAVUWe reserve the right to m

ake changes without prior notice597Techn
ake changes without prior notice597Technical dataPressure and flow ranges and sound to duct40 50 75 100 125 150 175 200 220 200 300 500 600 700 q
pt v LWA70 100 150 200 250 300 350 300 600 800 1000 1200 110 200 300 400 500 600 400 600 1000 1500 2000 500 600 700 800 1000 1500 2500 constant -/variable flow dampers13Technical dataDAU, DA2EU, DAVU596We reserve the right to make changes without prior noticeTechnical dataPressure and flow ranges and sound to ductA-weighted sound [dB], to duct. These curvs are intended for brief comparision. For more accurate calculation, please use the tables.Given: Diameter 125 mmFlow 70 l/sPressure drop 200 PaA-weighted sound power level approx. 57 dBThe table gives:Sound power level as belowExplanation to Diagramsv:Air velocity:pressure lossq:VolumeflowCentre frequency [Hz]631252505001 k2 k4 k8 kSound power level [dB]5252494949515146 15 20 30 40 50 60 70 100 150 200 250 40 [l/s] [Pa] [m³/h][m/s] WA [dB] Ø 80 20 30 40 50 60 70 80 90 95 100 150 200 250 300 s] [Pa] [m/s] [dB] Ø 100 q
pt v LWA405060708090100125150165200300500
pt LWADAU, DA2EU, DAVU592DAVU - motorized variable flow unitPressure range 50–1000 Pa (over the unit)Independent of mounting directionThe constant flow da

mper is an automatic damper, which at va
mper is an automatic damper, which at varying pressures wholly mechanical and independent of external energy sources maintains a set flow constant. The force, needed for regulation, is taken from the passing air stream. The air stream across the blade attempts to close it and generates a closing torque. This is balanced by an opposed opening force from a spring. The greater the pressure across the blade the more it closes. A bellow eliminates oscillations, which could occur at unfavourable TypesDAU – one flow unit – with knob and arrow for manual setting of one flow.DA2EU – two flows unit – with electric motor for switching between two flows. DAVU – variable flow unit – with electric motor for continuous setting of one flow.Housing and damper blade are of galvanized sheet metal TemperatureWorking range: +5 to +70 °C.The units can handle 50 mm duct insulation without the DAU is available with an 45 mm external insulation and an outer sheet metal shell for lower sound radiation to the surroundings. Is then called DALU.Regulating accuracyThe units are calibrated from factory within their whole working range. In this the units keep the flow constant within approximately ±5 to ±10% of the set flow. Greater dev

iations occur at the lower flows, aspeci
iations occur at the lower flows, aspecially for small Flow settingThe units can not be delivered from factory with a preset flow. You can set the flow yourself very easy following to the instruction for each product.Disturbance toleranceIn order to achieve the stated accuracy for the pre-set flow a straight distance of at least 3×d before and at least 1,5×d after the units are required. A mounting close to a source of disturbance (bend, saddle etc.) decreases the regulation accuracy and the flow may deverge from the Change of directionThe units are independent of their mounting direction and one may deviate from the specified direction and mount them in any direction without affecting the accuracy.The units can be mounted together with e.g. a motorized shut off damper DTBU, see page side 276. Constant flow damper combined with shut off damper can with advantage be used in groups at installations where you want:two flows, that lies too far away from each other for more than two flowsPresume: Forced flow 1 Forced flow 2 Four flows will then be posssible: GroundflowForced flow Forced flow Forced flow 2Forced flow 1DA2EU,DAVUConstant-/variableow dampers123456789101112131415161718Right to alterations reserv