lindab | constant-/variable flow dampers Constant-/variable flow dampers About Lindab 1 Comfort and Design 2 Product overview / symbols 3 Theory 4 Ceiling diffusers 5 Ceiling diffusers - visible 6 Plenum boxes 7 Wall diffusers 8 Nozzles 9 Ventiduct 10 Grilles 11 Displacement units 12 VAV 13 Constant- / variable flow dampers 14 Air valves 15 Fresh air valves/overflow unit 16 Cleanroom diffusers 17 Contents 18 © 10.2011 Lindab Ventilation A/S. All forms of copying without written permission are forbidden. is Lindab AB’s registered trademark. 563 Lindab’s products, systems and product group and product designations are protected by intellectual property rights (IPR). lindab | constant-/variable flow dampers Constant-/variable flow dampers Constant-/variable flow dampers 1 Product Functions Page 2 DAU 567 3 DA2EU 568 4 DAVU 569 5 Technical data 570 6 7 8 9 10 11 12 13 14 15 16 17 18 Right to alterations reserved Right to alterations reserved 564 lindab | constant-/variable flow dampers Constant-/variable flow dampers 1 2 3 4 5 6 7 8 9 10 11 DAU, air flow regulator Lindabs constant-/variable Functions flow dampers 12 In many instances it will be necessary to maintain a con- DAU is a mechanical constant flow damper which auto- stant air flow in a room, a zone etc. In normal ventilation matically sustains a given air flow, that is manually set on 13 units, pressure variations usually for one reason or another the regulation handle. DA2EU has a mounted electrical makes it necessary to regulate the air duct system, in motor, which is able to switch between two previously order to achieve the desired air flow in the right room. chosen air volumes/flows. 14 DAVU has a mounted electrical motor so that a modulat- In a proportional ventilation system, the slightest pressure ing regulation is possible within the full scale. variation will influence the air flow coming into the room. 15 Requirements of minimum air volume/flow in individ- ual rooms, in order to comply with public authority requirements or law requirements are often in place. 16 With Lindabs series of mechanical constant-/variable flow dampers, the desired air volume/flow is ensured, despite 17 the variety of pressure in the ventilation system itself. DAU, mechanical constant flow damper 18 with manual setting of one flow Right to alterations reserved Right to alterations reserved 565 lindab | constant-/variable flow dampers Constant-/variable DAU, flow dampers DA2EU, DAVU Summary Disturbance tolerance 1 • DAU - manual single flow unit In order to achieve the stated accuracy for the pre-set • DA2EU - motorized twin flow unit flow a straight distance of at least 3×d before and at least • DAVU - motorized variable flow unit 1,5×d after the units are required. A mounting close to a 2 • Diameters Ø 80–315 source of disturbance (bend, saddle etc.) decreases the • Flow range 15–830 l/s (54–2988 m³/h) regulation accuracy and the flow may deverge from the • Pressure range 50–1000 Pa (over the unit) set value. 3 • Independent of mounting direction • Handles 50 mm duct insulation Change of direction The units are independent of their mounting direction and Function one may deviate from the specified direction and mount 4 The constant flow damper is an automatic damper, which them in any direction without affecting the accuracy. at varying pressures wholly mechanical and independent of external energy sources maintains a set flow constant. Combinations 5 The force, needed for regulation, is taken from the passing The units can be mounted together with e.g. a motorized air stream. The air stream across the blade attempts to shut off damper DTBU, see page side 276. Constant flow close it and generates a closing torque. This is balanced damper combined with shut off damper can with advan- 6 by an opposed opening force from a spring. The greater tage be used in groups at installations where you want: the pressure across the blade the more it closes. A bellow eliminates oscillations, which could occur at unfavourable • two flows, that lies too far away from each other for 7 conditions of operation. a two flow unit to handle Types or 8 The following types exists: • DAU – one flow unit – with knob and arrow for man- • more than two flows ual setting of one flow. 9 • DA2EU – two flows unit – with electric motor for Presume: Basic flow = 80 l/s switching between two flows. Forced flow 1 = 100 l/s • DAVU – variable flow unit – with electric motor for Forced flow 2 = 150 l/s continuous setting of one flow. 10 Four flows will then be posssible: Material Housing and damper blade are of galvanized sheet metal 80, 180, 230 and 330 l/s. 11 and shaft is of stainless steel. Temperature 12 Working range: +5 to +70 °C. Insulation The units can handle 50 mm duct insulation without the 13 BasicGroundflow flow scale or the motor being hidden. DAU is available with an 45 mm external insulation and ForcedForced flow flow 1 1 14 an outer sheet metal shell for lower sound radiation to the ForcedForced flow flow 2 2 surroundings. Is then called DALU. 15 Regulating accuracy The units are calibrated from factory within their whole working range. In this the units keep the flow constant 16 within approximately ±5 to ±10% of the set flow. Greater deviations occur at the lower flows, aspecially for small sizes. 17 Flow setting The units can not be delivered from factory with a preset flow. You can set the flow yourself very easy following to 18 the instruction for each product. Right to alterations reserved 566 lindab | constant- / variable flow dampers Constant- / variable flow dampers DAU Dimensions 1 B 2 122 65 3 1 Ød 4 l 5 Description Tightness class 6 Constant flow damper with manual setting of one flow Ød1 l B m across closed nom mm mm kg blade DAU is a constant flow damper, which facilitates balancing 80 240 122 1,35 0 7 of ventilation systems and gives correct flow from the start. 100 240 122 1,40 0 The unit compensates for e.g. connection and disconnec- 125 240 135 1,65 0 tion of system parts, clogging of filters and ducts, thermal lift 8 forces, wind effects, window opening etc. 160 250 170 1,85 0 200 268 210 2,26 0 Ø 80–315 fullfills pressure class A in closed position. 250 290 260 3,35 0 9 Fulfils tightness class C. 315 332 325 4,75 0 There is a separate assembly, measuring, balancing and DAU is available with an 45 mm external insulation and an maintenance instruction for this product. outer sheet metal shell for lower sound radiation to the sur- 10 roundings. Is then called DALU. Technical data 122 Flow setting 11 The flow is set by loosing the center nut and via the knob 20 turning the scale arrow so it points at the wanted flow on the scale. Then the center nut is tightened. 12 B l 13 Tightness class 14 Center nut Ød1 l B m across closed nom mm mm kg blade Scale arrow 80 240 170 2,35 0 100 240 190 2,50 0 15 125 240 215 2,90 0 160 250 250 3,45 0 16 200 268 290 4,06 0 250 290 340 6,05 0 315 332 405 8,60 0 17 Order code DAU aaa Product 18 Dimension Ød1 We reserve the right to make changes without prior notice 567 lindab | constant- / variable flow dampers Constant-/variable flow damper DA2EU Dimensions 1 B 2 130 3 1 4 Ød l 5 6 Description Tightness class Constant flow damper with electric motor for switching Ød1 l B m across closed between two flows nom mm mm kg blade 7 DA2EU is a constant flow damper, which facilitates 80 250 122 1,95 0 balancing of ventilation systems and gives correct flow from 100 250 122 2,00 0 the start. The unit compensates for e.g. connection and 125 250 135 2,25 0 8 disconnection of system parts, clogging of filters and ducts, thermal lift forces, wind effects, window opening etc. The 160 250 170 2,45 0 motors shall be completed with a switch. The switch can in 200 250 210 2,86 0 turn be controlled either manually with timer, with on/off- 250 290 260 3,95 0 9 thermostat, with attendance transmitter or similar. 315 332 325 5,35 0 Ø 80–315 fullfills pressure class A in closed position. Fulfils tightness class C. 10 There is a separate assembly, measuring, balancing and maintenance instruction for this product. Order code DA2EU aaa 24 LM Flow setting 11 Product The two flows are set Dimension Ød1 by moving the end Voltage stoppers screws. 0 End stop screws BELIMO R Motor type 12 Made in Switzerland At delivery the LM230A 1 screws are set at largest possible 13 distance. 14 Technical data for the motors LM 24 A LM 230 A Power supply............................. AC 19,2–28,8 V, 50/60 Hz AC 85–265 V, 50/60 Hz 15 DC 19,2–28,8 V Power consumption .................. 1 W 1,5 W – + – + For wire sizing ........................... 2 VA 4 VA Connection................................ Cable 1 m, 3×0,75 mm2 Cable 1 m, 3×0,75 mm2 16 Operating angle......................... Max. 95°, adjustable 0–100% Max. 95°, adjustable 0–100% 0 Torque at rated voltage ............. Min. 5 Nm Min. 5 Nm Direction of rotation................... Switch selectable Switch selectable 1 23 1 2 3 0 or 1 0 or 1 17 Position indication....................