var - swegon

1

VARVariable-fl ow commissioning damper

VAR

Quick guideQuick Facts ► Pressure-independent air fl ow regulation

► Compact and robust design

► Only for use in areas where temperature is kept between 0 and 50°C

► Individually factory-calibrated on delivery and pro-grammed for minimum and maximum airfl ows

► Available in circular sizes up to Ø500 mm and in rectangular versions up to 1600 x 700 mm

► 0 V control signal allows for complete shut down

► Can be set in open or closed position manually

► Ductwork Leakage Class 4 for circular and Class 3 for rectangular dampers

F L O W R A N G E

VAR l/s

Size min max(nom)

100 12 58

125 19 95

160 35 170

200 55 272

250 89 438

315 142 695

400 228 1117

500 367 1797

2

VAR

Swegon reserves the right to alter specifications. 20111128 www.swegon.com

Technical descriptionDesign VAR comprises a duct section with a damper and mea-suring device. VAR should only be installed in areas with an ambient temperature within the range of 0 to 50 °C, outside this range functions are not guaranteed. The rectangular versions are built on opposed blade dampers with a measuring station and are available in most sizes common to the market, up to 1600 x 700 mm. For rec-tangular versions H > 700 mm only VAR 2 can be used.

In circular design the damper fulfils the sealing class 4 requirements and in rectangular design the class 3 requi-rements. This enables complete air flow shut off. The flow through VAR is measured over a measuring rod (several are interconnected in the rectangular version), unaffected from disturbances and smirching. In extract air systems with dust-rich air the use of VAR 4, with static air flow measuring and minimal risk of clogging, is recommended.

VAR is available in three models:

VAR 1: A compact model in which changes in the min/max flow are performed using special instruments ZTH-GEN or BelImos software, PC-tool.

VAR 2: A universal model. Min/max air flows are changed via the built-in potentiometers or with the instrument ZTH-GEN. VAR 2 can in a special version be equipped with a spring-return motor.

VAR 4: A Siemens compact model in which changes in the min/max air flows are performed using special instru-ment AST 10.

Materials and surface treatmentAll sheet metal parts in VAR are made of galvanised sheet steel as standard. The measurement rod is manufactured of extruded aluminum.

Accessories RTC. Room thermostat with output for air cooling via VAR and heating control.

DETECT Quality. Carbon dioxide sensor med integrerad temperaturgivare. with integrated temperature sensor. Available for either room, DETECT Q 1 or duct installation, DETECT Q 2.

DETECT O, Occupancy sensorfor switching to minimum air flow when no one present or two-step function min-max.

VART 5,sensor unit for slave control of VAR.

FSR, quick fit connector for simple dismantling when cleaning.

Figure 1. VAR 1

Figure 2. VAR 2

Figure 3. VAR 4

Figure 4. VAR 1-IR

3

VAR


VAR

Figure 6. VART-5 for slave control of VAR.

Figure 7. Room thermostat RTC, carbon dioxide- and tempe-rature sensor DETECT Quality and occupancy sensor DETECT Occupancy.

Figure 8. Effect of set working range 0-100% on minimum and maximum air flows.

Explanation of figure 8.A. = Control voltage V DCB. = Relative airflow

PlanningVAR is designed for demand-controlled ventilation in rooms with variable loads, caused by occupants’ heat and carbon dioxide emission, heat from lighting, compu-ters etc. VAR is not designed for ventilation of industrial processes. VAR may not be installed in humid, cold nor aggressive environments. Due to components like rubber sealing and shaft bearings environmental and/or air tem-peratures may not exceed 50 °C.

VAR is suitable for installation in extract and supply air sys-tems alike. VAR is pressure-independent but requires a mini-mum air flow equivalent to the open damper pressure drop to function properly, see graph in "Technical Data" section.

VAR is factory calibrated with a nominal air flow (Qnom

) and in those cases where min/max are stated on the order these will be preprogrammed as well. However, VAR 2 is always delivered with the setting 0-100%.

There are many ways of controlling VAR, including forced control for maximum and minimum air flow or open or closed damper, see the wiring diagrams. When carrying out design work, the minimum air flow required by VAR has to be taken in to consideration.

When VART 5 or VAR is used as master, it is necessary to use the same dimension for the slave unit as the master unit. The regulators are delivered with a standard 0-10 V actual and set value signal. VAR 1 and 2 can be delivered with a 2-10 V signal.

It is possible to set the minimum air flow to 0% (applies only to VAR 1 and 2) and hence make the damper close under the following conditions:

The control voltage must be < 0.5 V DC. Between around 1.5 V*) and 0 V the airflow changes as shown in figure 8. The example applies to VAR set for 0–100%. When the damper moves towards the closed position the airflow is held at the 1.5 V*) setting until the voltage drops to < 0.5 V, then the damper closes. When opening, the damper remains closed until 1.5 V*) is reached. Additional features can be obtained if the unit is controlled manually using an external switch, see explanation under wiring diagrams.

*) Volt refers to control Voltage. See air flow tables on pages 8 and 10 to 11.

Building Management Systems BMSAll VAR versions may be analogically connected to Buil-ding Management Systems (BMS). VAR has actual and set value signals in accordance with the 0-10 V system. VAR 1 (Belimo compact) can also be connected digitally to all versions of the Belimo UK24 system for communication over LonTalk etc.

Figure 5. VAR, rectangular

4

VAR


Figure 9. Air flow control with temperature sensor or CO2 sensor

(supply and extract air controlled in parallell by the temperature sensor).

Figure 10. Individual room control with overflow air. Extract air is slave controlled by the total supply air volume.

Explanations of Figures 9-10.1 = Room thermostat RTC2 = Temperature sensor Detect Q3 = VAR unit

ControlSome examples of how a demand-controlled ventilation system can be designed are shown below. When regulation via a CO

2 sensor is chosen, the room

thermostat is not required as Detect Q has an integrated temperature sensor that combines its output with the value from the CO

2 sensor. The greatest signal from

Detect Q is sent to VAR to regulate the air flow. With the help of the occupancy sensor Detect O, the 0-10 V signal can be broken so that VAR shuts down to minimum air flow when no one is present and does not, thereby, venti-late unnecessarily. Detect O can also be connected so that VAR is turned off completely.

Slave controlA VAR unit can be slave controlled from another VAR or from VART 5. Slave control can also be achieved by parallel connection, that is, by connecting the room thermostat signal to both the extract and supply air units. Parallel connection is recommended because the control signals are sent to both units at the same time and air flow can be freely set within the working range of the VAR units. Slave control is limited as the slave unit cannot have a greater air flow than the master unit and because lower flows can only be obtained as a percentage of the master unit air flow. In systems with VART 5 as sensor unit, the slave control principle is always applicable.

5

VAR


VAR

Installation measurements.

Size (1) A A + 10 mm

100 472 482

125 472 482

160 472 482

200 472 482

250 522 532

315 552 562

400 684 694

500 810 820

Figure 13. Installation in a duct system. The ducts must be firmly fixed to the frame of the building on each side of the VAR unit.

Figure 12. VAR requires a duct of ~2 x ØD between the VAR and a sound attenuator fitted with baffles.

InstallationTo obtain the correct distribution of air across the mea-suring rods in VAR a straight section is required before the unit in the direction of the air flow, according to installation, see figures 11-15. Assembly instructions are included with the product and are also available from www.swegon.com.

Figure 11. Straight section requirements, circular ducts.

Explanations of figures 11-13.1. Terminal VAR2. Quick fit connector, FSR3. Sound attenuator with baffle.

6

VAR


12

Straight sections before VAR for rectangular ducts

Type of obstruction m2=5% m

2=10%

One 90°-bend 3 x B 2 x B

One T-piece 3 x B 2 x B

Sound attenuator with baffles 3 x t 2 x t

t = baffle width, m2 = method error

Figure 15. Straight section requirements, rectangular ducts.

Wiring diagramsVAR-1For forced control to fixed positions the following applies: The control signal to 3 must be broken, this gives the set minimum flow.

a) opens the damper completely. b) closes the damper completely when setting the 2-10 V working range, while for the 0-10 V range the set mini-mum air flow will be obtained.

d) gives the set maximum flow.

NOTE! Unless the control signal to 3 is broken, the room regulator exit will short circuit and the equipment will be damaged.

- + PP Z1 Z2

0-10 alt. 2-10 V DC

2-10 V DC

Figure 16. Wiring diagram VAR-1.


Figure 14. Straight section requirements, rectangular sound attenuators with baffles.

Explanation of figures 14-15.1. Terminal VAR.2. Sound attenuator with baffle Mesurement A in Figure 15 according to table above.

VAR-2For forced control to fixed positions the following applies:

a) opens the damper completely b) closes the damper completely c) gives set minimum flow d) gives set maximum flow.


U

1 2 3 5

~ Y

24V AC 0-10 alt. 2-10 V DC

MP-bus

NMV-D3-MP SWNLMV-D3-MP SWN

adb

2-10 V DC

7

VAR


VAR


CommissioningSee separate commissioning instructions.

MaintenanceVAR is maintenance-free. Clean only using a vacuum cleaner or with a dry cloth. When cleaning the duct system, VAR must be dismantled if there are no inspection covers nearby. Cleaning equipment such as whisks must not be fed through VAR.

EnvironmentThe Declaration of construction materials is available at www.swegon.com.

Control and regulating equipmentFor correct functioning of the control and regulating equipment it is of great importance that the following is observed.

• VAR must only be installed in rooms where the tempe-rature is between 0 and 50 °C.

• All the interconnected regulating equipment must have the same polarity.

Operating dataAmbient temperature: 0° – +50°C

Air flow temperature: -20° – +60°C

Electrical data

Feed voltage 24 V AC ±20%, 50-60 Hz

Power consumption, for transformer rating:

VAR 1 with Belimo compact 6 VA

VAR 2 with Belimo universal 9,5 VA

VAR 4 with Siemens compact 6 VA

VAR-4For forced control to fixed positions or functions when 0-10V control is connected:

a) closed gives completely open damper. b) closed gives completely closed damper.

When 0-10V control is not connected, the following fun-ctions are obtained:

a and b) open gives set min. air flow. a and b) closed gives set max. air flow.


8

VAR


Sound dataSound power levelGraphs below shows the total sound power (L

WtotdB), as

a function of the velocity and pressure drop across the damper. By correcting L

Wtot with the correction factors

from table, the sound power levels for respective octave bands will be obtained(L

W = L

Wtot + K

OK ).

Correction factor Kok

for cirkular design

SizeMid-frequency (Octave band) Hz

63 125 250 500 1000 2000 4000 8000

100 0 -5 -9 -16 -18 -25 -33 -39

125 0 -5 -9 -18 -19 -26 -33 -41

160 0 -5 -10 -17 -19 -24 -30 -39

200 0 -4 -10 -16 -17 -22 -29 -39

250 0 -5 -9 -13 -17 -21 -27 -37

315 0 -5 -9 -11 -14 -19 -26 -36

400 0 -6 -8 -11 -13 -17 -25 -32

500 0 -5 -7 -12 -13 -17 -26 -36

Tol ± 2 2 2 2 2 2 2 2

Transmitted soundThe sound transmitted from VAR can be calculated using the following formula:

LW, out

= LW, duct

+ Ktrans

Technical dataCircular versionAir flowsAll versions of VAR have a nominal air flow, Q

nom, for each

size.

The maximum air flow can be set between 30 and 100 % of Q

nom. The regulating range for the maximum air flow is

given in Table 2.

The minimum flow is adjusted in relation to Qnom

and can be set between 0 and 80% of Q

nom.

The regulators cannot function at air flows less than Qmin

, as the measured pressure is too low and the regulation ceases.

VAR 1, 2 and 4 can be supplied in special versions with larger max flow, mesured pressure up to 200 Pa. The Con-sequence is less accuracy in the lower area. N.B. In some cases, high airflows can generate increased sound levels.

Air flows

Sizeair flows l/s

Qmin

(5 Pa) Qnom/max

(120 Pa) k-factor

100 12 58 5,3

125 19 95 8,7

160 35 170 15,5

200 55 272 24,8

250 89 438 40,0

315 142 695 63,4

400 228 1117 102,0

500 367 1797 164,0Correction factor K

ok, uninsulated version


63 125 250 500 1000 2000 4000 8000

100 -5 -9 -7 -5 -2 0 1 0

125 -6 -10 -8 -6 -3 -1 0 -1

160 -7 -11 -9 -7 -4 -2 -1 -2

200 -8 -12 -10 -8 -5 -3 -2 -3

250 -9 -13 -11 -9 -6 -4 -3 -4

315 -10 -14 -12 -10 -7 -5 -4 -5

400 -11 -15 -13 -11 -8 -6 -5 -6

500 -12 -16 -15 -12 -9 -7 -6 -7

9

VAR

Swegon reserves the right to alter specifi cations. 20111128 www.swegon.com

VAR

ps Pa

40 50 100 200 300 400 500 1000 2000 m3/h

10 20 30 40 50 100 200 300 400 500 l/s 100010

20

30

4050

100

200

300

400500

1000

50

55

60

65

70 dBWtotL

20%

100%

ps Pa

20 30 40 50 100 200 300 400 500 1000 m3/h

4 5 10 20 30 40 50 100 200 300 l/s 40010

20

30

4050

100

200

300

400500

1000

50

55

60

20%

100%

70dBWtotL65

Engineering graphsAir fl ow – Pressure drop – Sound level• The data is for the sound created in ducts.

• The sound levels, Lwtot

, shown in the graphs are for 50, 55, 60, 65 and 70 dB.

ps Pa

10 20 30 40 50 100 200 300 400 500 m3/h

2 3 4 5 10 20 30 40 50 100 l/s 20010

20

30

4050

100

200

300

400500

1000

50

55

20%

100%

60

70dBWtotL65

ps Pa

20 30 40 50 100 200 300 400 500 1000 m3/h

4 5 10 20 30 40 50 100 200 300 l/s 40010

20

30

4050

100

200

300

400500

1000

50

55

60

20%

100%

70dBWtotL

65

VAR 125

VAR 160

VAR 100

VAR 200

ps Pa

100 200 300 400 500 1000 2000 3000 40005000 m3/h

20 30 40 50 100 200 300 400 500 1000 l/s 200010

20

30

4050

100

200

300

400500

1000

50

55

60

65

20%

100%

70dBWtotL

ps Pa

40 50 100 200 300 400 500 1000 2000 m3/h

10 20 30 40 50 100 200 300 400 500 l/s 100010

20

30

4050

100

200

300

400500

1000

50

55

60

20%

100%

70dBWtotL65

VAR 250 VAR 315

10

VAR

Swegon reserves the right to alter specifi cations. 20111128 www.swegon.com

Rectangular versionAir fl owsAll versions of VAR have a nominal air fl ow, Q

nom, for each

size.

The maximum air fl ow can be set between 30 and 100 % of Q

nom.

The minimum fl ow is adjusted in relation to Qnom

and can be set between 0 and 100% of Q

nom.

The regulators cannot function at air fl ows less than Qmin

, as the measured pressure is too low and the regulation ceases.

VAR 1, 2 and 4 can be supplied in special versions with larger fl ow ranges, mesured pressure up to 200 Pa. The Conse-quence is less accuracy in the lower area. N.B. In some cases, high airfl ows can generate increased sound levels.

ps Pa

300 400 500 1000 2000 3000 4000 5000 10000 m3/h

100 200 300 400 500 1000 2000 3000 4000 5000 l/s10

20

30

4050

100

200

300

400500

1000

50

55

60

65

70 dB WtotL

20%

100%

ps Pa

200 300 400 500 1000 2000 3000 4000 5000 m3/h

30 40 50 100 200 300 400 500 1000 2000 l/s 300010

20

30

4050

100

200

300

400500

1000

50

55

60

65

20%

100%

70dBWtotL

VAR 500VAR 400

Air fl ows

SizeAir fl ows l/s

Qmin.

(5Pa) Qnom.

(120Pa) k-factor

300 x 200 112 548 50,0

400 x 200 149 728 66,5

500 x 200 187 915 83,5

600 x 200 224 1095 100,0

700 x 200 262 1282 117,0

800 x 200 297 1457 133,0

1000 x 200 373 1829 167,0

300 x 300 170 833 76,0

400 x 300 228 1117 102,0

500 x 300 284 1391 127,0

600 x 300 340 1665 152,0

700 x 300 398 1950 178,0

800 x 300 454 2224 203,0

1000 x 300 568 2782 254,0

11

VAR


VAR

Sound dataSound power levelThe graph below shows the total sound power (L

WtotdB),

as a function of the velocity and pressure drop across the damper. By correcting L

Wtot with the correction factors of

each table below, the sound power levels for respective octave bands are obtained (L

W = L

Wtot + K

OK + K

K).

Correction factor KOK

for rectangular design.


63 125 250 500 1000 2000 4000 8000

All -1 -5 -7 -8 -13 -22 -31 -30

Tol. ± 4 4 3 2 2 2 2 2

Correction factor Kk for the area m2 of the face

damper, rectangular design.

Correction factor – area in m2 of the face damper

Area m2 0,1 0,15 0,25 0,4 0,6 1,0 1,6 2,5

Kk

-3 -2 0 2 4 6 8 10

Transmitted soundThe sound transmitted from VAR can be calculated using the following formula:

LW, out

= LW, duct

+ Ktrans

%Ps500

200

100

50

20

10

5

Pa 30% 40% 50% 60%

70%

80%

90%

100%

1 2 3 4 5 m/s 10

40

50

60

70

Engineering graphsAir flow – Pressure drop – Sound level• Data applies to sound generation in the duct

• Minimum flow applies at 1.5 m/s in the duct

Calculate the face velocity across the damper and read the sound data and pressure drop at an appropriate damper position.

100% the damper is fully open. Correct with data from each table.

SizeAirflows l/s

Qmin.

(5Pa) Qnom.

(120Pa) k-factor

400 x 400 304 1490 136,0

500 x 400 382 1873 171,0

600 X 400 458 2246 205,0

700 x 400 534 2618 239,0

800 x 400 610 2991 273,0

1000 x 400 762 3735 341,0

1200 x 400 915 4480 409,0

1400 x 400 1069 5236 478,0

1600 x 400 1221 5981 546,0

500 x 500 479 2344 214,0

600 x 500 575 2815 257,0

700 x 500 671 3286 300,0

800 x 500 767 3757 343,0

1000 x 500 959 4699 429,0

1200 x 500 1149 5631 514,0

1400 x 500 1342 6573 600,0

1600 x 500 1534 7515 686,0

600 x 600 691 3385 309,0

700 x 600 807 3955 361,0

800 x 600 921 4513 412,0

1000 x 600 1152 5642 515,0

1200 x 600 1382 6770 618,0

1400 x 600 1614 7909 722,0

1600 x 600 1845 9037 825,0

700 x 700 944 4623 422,0

800 x 700 1078 5280 482,0

1000 x 700 1348 6606 603,0

1200 x 700 1617 7920 723,0

1400 x 700 1887 9246 844,0

1600 x 700 2156 10560 964,0

12

VAR


250

Dimensions and weightsVAR 1, 2 and 4

50210

Ø D

92

Figure 24. VART 5, rectangular.

SizeØd A B C E H L Weight, kg Weight, kg

mm mm mm mm mm mm mm uninsulated VAR insulated VAR

100 99 472 245 61 90 180 401 2,6 3,9

125 124 472 245 61 77 180 401 2,9 4,0

160 159 472 285 61 60 215 401 3,3 4,8

200 199 472 335 61 40 255 401 4,0 5,8

250 249 522 395 61 15 305 452 4,9 7,8

315 314 552 465 61 - 370 452 6,5 9,7

400 399 684 553 61 - 462 614 10,7 14,9

500 499 810 653 61 - 565 740 15,7 21,3

Figure 21. VART 5, circular.

Figure 23. VAR 4, rectangular.

Figure 22. VAR 1-IR, rectangular (insulated casing).Figure 19. VAR 1, circular.

Figure 20. VAR 2, circular.

13

VAR


VAR

Ordering keyProduct designationCircular design

Terminal unit for DCV-system

VAR d -a -bbb -cc -ddd/eee

Version:

Variant: 1 = compact (Belimo) 2 = universal (Belimo) 4 = compact (Siemens)

Dimensions: 100, 125, 160, 200, 250, 315, 400, 500

Insulation: IR (Insulated casing)

Factory set air flow (l/s): min/max

If no air flows are stipulated, VAR is supplied with the settings max 100% = nom l/s and min = 0%. Also state whether VAR 1 or VAR 2 models are to be supplied with a 2 -10 V DC working range.

Rectangular design

Terminal unit for DCV-system

VAR d -a -bbb-ccc -ddd/eee

Version:

Variant: 1 = compact (Belimo) 2 = universal (Belimo) 4 = compact (Siemens)

Dimensions: W x H

Factory set air flow (l/s): min/max

If no air flows are stipulated, VAR is supplied with the settings max 100% = nom l/s and min = 0%. Also state whether VAR 1 or VAR 2 models are to be supplied with a 2 -10 V DC working range.

Accessories

Room thermostat RTC

Carbon dioxide/temperature sensor for room DETECT Q 1

Carbon dioxide/temperature sensor for duct DETECT Q 2

Occupancy sensor for wall installation DETECT O V110

Occupancy sensor for ceiling installation DETECT O T360

Hand terminal, works with VAR 1 & 2 BELIMO ZTH-GEN

Quick fit connector to ventilation duct: FSR -aaa

Dimensions: 100, 125, 160, 200, 250, 315, 400 and 500

Sensor unit for slave control VART 5 -aaa

Dimensions: 200, 250, 315, 400 and 500

Specification example

Swegon terminal unit for DCV-system of type VAR, with the following functions:

• Pressure independent VAV unit for demand-controlled ventilation

• Factory calibrated air flow

• Pressure-independent electronic air flow regulation

• Must be installed with minimum straight duct sections as stated in relevant catalogue data, only for tempera-tures between 0 and 50 °C

Accessories:

Room thermostat RTC xx items

Carbon dioxide sensor DETECT Q with integrated temperature regulationg

xx items

Quick fit connector to duct system FSRR xx items

Sensor unit for slave control of VART 5 xx items

Occupancy sensor DETECT O xx items

Size:

VARd a - bbb - cc - ddd/eee xx items

VARd a - bbb - cc - ddd/eee xx items

etc.

var - swegon

Documents