Swegon REACTa Installation manual

REACTa

Installation – Commissioning – Maintenance

Installation

Air flow measuring of REACT requires a straight section of duct before the unit (in air flow direction), according to installation figures. Modbus tables are available in a separate document (REACTa_Modbus-m).

Installation – circular version

Legend to figures 3-5:

1. Circular Variable-flow damper REACT

2. Clamp, FSR

3. Sound attenuator with baffle

20160307

Figure 1. Permissible ambient temperature.

Min. 500 mm

Min. 100 mm

Figure 3. Straight section requirements, circular ducts.

Figure 2. Space required for installation.

Figure 4. REACT requires a duct of ~2 x ØD between the REACT and a sound attenuator fitted with baffles. NOTE: Ducts must be fixed on both sides of REACT.

1

REACT

Figure 5. Installation in a duct system. The ducts must be firmly fixed to the frame of the building on each side of the REACT unit.

Installation measurements – circular version

Size

100

125

160

200

250

315

400

A (mm)

472

472

472

472

522

552

695

Inst. measurements (A + 10 mm)

482

482

482

482

532

562

705

500 822 832

Installation – rectangular version

Measurement B in the figure and table below can be found on page 11, in the table; "Dimension, air-flow and k-factors

– rectangular version".

Straight sections before REACT for rectangular ducts

Type of obstruction

One 90°-bend

One T-piece

E (m

2

=5%)

E = 3 x B

E = 3 x B

E (m

2

=10%)

E = 2 x B

E = 2 x B

E

Straight sections before/after REACT –

Sound attenuator with baffles

E

1 2 3

470 mm ≥500 mm

Figure 7. Straight section requirements, rectangular REACT and sound attenuator with baffles. Installation with a length of straight duct applies to both the supply air and the extract air.

1 = Rectangular Variable-flow damper REACT.

2 =

≥ 500 mm length of straight duct.

3 = Sound attenuator with baffles.

E

E = Straight section.

B = Width, duct.

H = Height, duct.

Figure 6. Straight section requirements, rectangular ducts. Dimensions B

and H (B = Width, H = Height) can be read off the label on the delivered

product.

2

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REACT

250

315

400

500

100

125

160

200

Dimensions and weights

REACT – circular

Dimensions (mm)

Size

ØD Ød A

125

150

185

225

275

340

425

525

249

314

399

499

99

124

159

199

472

472

472

472

522

552

695

822

C

45

45

57

57

45

45

45

45

3.4

4.4

6.0

9.0

1.9

2.0

2.1

2.3

REACT

Weight (kg)

REACT

GUAC

2,9

3,0

3,1

3,3

4,4

6,0

7,6

10,6

FSR

0.7

0.8

1.2

1.4

0.4

0.4

0.6

0.6

100

Ød

A

C

Figure 8. Circular REACT and REACT MB.

C

Figur 11. Circular REACT GUAC with spring return actuator.

92

Ø d

45

210

Figure 9. REACT CU, circular and rectangular versions.

D d

Figur 10. FSR.

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3

REACT

REACT insulated – circular version

Size

250

315

400

500

100

125

160

200

A

45

45

57

57

45

45

45

45

E

Dimensions (mm)

Ød F

305

370

462

563

180

180

215

255

99

124

159

199

249

314

399

499

451

481

595

723

401

401

401

401

G

395

465

553

653

245

245

285

335

Weight

(kg)

4,1

4,3

5,1

6,2

8,2

10,7

15,6

22,4

REACT – rectangular version

Dimensions B and H (B = Width, H = Height), can be found in the table; "Air flows and measures – rectangular version", see page 11.

250

25

220

Figure 14. REACT and REACT MB, rectangular version.

Figure 12. REACT and REACT MB insulated, circular.

REACT insulated GUAC - circular version

Size

100

125

160

200

250

315

400

500

I

242

242

282

332

392

462

550

650

Dimensions (mm)

Ød J K

99

124

159

199

249

314

399

499

472

472

472

472

522

572

684

810

177

177

212

252

302

367

459

558

M

399

399

399

399

449

479

593

721

Weight

(kg)

4,7

4,9

5,7

6,8

8,8

11,3

16,2

23

Figure 15. REACT CU, rectangular version.

250

Figure 13. REACT insulated GUAC - circular design.

4

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ød

J

Figure 16. REACT insulated GUAC - circular design.

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REACT

Technical data

To obtain the correct functionality. it is very important that the following is taken into account:

• REACT may only be installed in spaces with an ambient temperature in the range 0-50°C.

• All interconnected regulating equipment must have the same polarity. i.e. the neutral wire must be correctly connected.

• The product should always be installed with its flow meter facing downstream, see air direction arrows on the product label.

• REACT is not suitable for use in explosive environments.

• All service must be carried out with the power supply disconnected.

Operating data

Ambient air temperature:

Air-flow temperature:

Running time open/close (90 degrees):

0° – +50°C

0° – +50°C

5 Nm - 100 s

Storage and transport

Ambient temperature:

Electrical data

Supply voltage

-20° – +80°C

24 V AC/DC +-20%, 50/60 Hz

Power consumption. for transformer rating:

REACT 5 Nm 2.5 W

REACT 10 Nm 2,5 W

REACT 15 Nm 3 W

4 VA

4,5 VA

4,5 VA

GUAC DM3 controller 0,6 W

Spring return actuator 5 Nm 6,5 W (standby 2 W)

Spring return actuator 10 Nm 5 W (standby 2 W)

1,3 VA

7,5 VA

8 VA

Mechanical opening/closing of the spring return actuator

Mechanical handling of dampers can only be performed if the actuator is de-energized. The supplied key (attached to the motor cable) or a 2.5 mm hex key, is used for mechanical handling.

Spring return actuators on REACT GUAC are supplied as standard from the factory with the spring return of the damper set to deenergized/closed.

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5

REACT

Wiring, standard version

BU-BN – Operating voltage

BU-BK – Control signal

BU-GY – Feedback signal

Load for output GY: max 0.5 mA

24 V AC/DC

0..10/(2..10) V

0..10/(2..10) V

Wiring, Modbus version

BU-BN – Operating voltage

BU-BK – Control signal

BU-GY – Feedback signal

Load for output GY: max 0.5 mA

24 V AC/DC

0..10/(2..10) V

0..10/(2..10) V

5 Nm

3 W 5 VA

100s (90°) 95°

250 Pa max. 100 kPa

1 2 3 4

BU BN BK GY

+

Y U

1 2 3 4

BU BN BK GY

-

+

Y U

0..10 V DC

(2..10 V DC) a. b. c. d. e.

BU = Blue (1)

BN = Brown (2)

BK = Black (3)

GY = Grey (4)

N L

24 V AC/DC

0..10 V DC

(2..10 V DC)

Figure 17. Wiring diagram, standard version.

1 2 3 4

BU BN BK GY WH WH

-

+

Y U

5 Nm

3 W 5 VA

1000s (90°) 95°

2550 Pa max. 100 kPa

1 2 3 4 A B

BU BN BK GY WH WH

+

Y U

0..10 V DC

(2..10 V DC) a. b. c. d. e.

BU = Blue (1)

BN = Brown (2)

BK = Black (3)

GY = Grey (4)

WH = White (A, B)

N L

24 V AC/DC

A B

Modbus

0..10 V DC

(2..10 V DC)

Figure 19. Wiring diagram, Modbus version.

Connection GUAC version

Connections are made in accordance with the left-hand circuit diagram GUAC, see label on the inside of the cover.

1-2 – Operating voltage

1-3 – Control signal

1-4 – Feedback signal

Load for output GY: max 0.5 mA

24 V AC/DC

0..10/(2..10) V

0..10/(2..10) V

NOTE! Electrical connection of the spring-return actuator installed at the factory.

Override control and control signal

Various options for control can be preset.

See the relevant wiring diagram in figure 17-19.

a. Damper opens fully, 24 V AC (positive rectified half-wave). b. V max c. V min

, 24 V AC/DC.

, no signal, Mode: 0..10 V. d. Damper closes fully, ground/earth (-): 0..10 V – CLOSED if V min

= 0. e. Regulation with the control signal, default 0..10 V (alt. 2..10 V).

GUAC

1 2 3 4

+

Y U

0..10 V DC

(2..10 V DC) a. b. c. d. e.

N L

24 V AC/DC

0..10 V DC

(2..10 V DC)

6

Figure 18. Wiring diagram, GUAC version.

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3

Test

I/s m /h

REACT

I/s

Test m /h

Flow

Vmin

Adr

Mode

Test

Vmax

1

2

Vnom Flow

Adr Vmin

Mode

Test

Vmax

227VM

3

I/s

Test

4

3 m /h

Test

I/s m /h

Flow

Vnom

Vmin

Vmax

Flow

Adr

Mode

Vmin

Vmax

Figure 20. The REACT interface.

1 – Select desired mode by turning the "Mode" wheel.

2 – Set values and select sub-settings by turning the ”Edit" wheel.

Flow

4 – ”Gear release” button

Adr Vmin

Mode

Test

Vmax

Menus

Vnom

Flow

I/s

Test

Flow

Vnom

I/s

Test

• Toggle between l/s and m 3 /h using the edit wheel.

Adr

Mode

Test

Vmin

Adr

Vmax

Mode

Test

Vmax

Vmin the selected mode.

Vnom Flow

Adr Vmin

Mode

Test

Vmax

Vmin

I/s

Test m /h

• Select new value for Vmin with the edit wheel.

Vnom Flow

Adr Vmin

Mode

Test

Vmax

Vnom

Test

Mode

Adr

Vmax

I/s

Test

Vmax

Vmin

Flow

• Select new value for Vmax with the edit wheel.

• Vmax value should be greater than Vmin

Vnom Flow

Test

I/s

Test m /h

Adr Vmin

Mode

Test

Vmax

Test

Adr

Vmax

Vnom

Vmin m /h st

Te

I/s

on – Test mode is on, damper stays in current position.

oP – Opens the damper fully.

cL – Closes the damper fully.

Lo – Low flow, forces the actuator to Vmin.

Hi – High flow, forces the actuator to Vmax.

123 – Displays current software version.

Vnom Flow

Adr Vmin

Mode

Test

Vmax

Vnom

Vmax

Test

Flow

Vmin

Adr Vmin

Mode

Test

Flow

Vmax

Mode

Adr

Vnom

Mode

I/s

Test

• Displays selected input and reference signal.

• Toggle between 0-10 and 2-10 V using the edit wheel.

Adr

I/s

Test

• Used for Modbus. for particulars on how to use

Modbus, see next page.

Test

Adr

Vnom

Mode

Adr

Flow

Vmin

Mode

Test

Vmax

Vnom

I/s

Test

• Used for factory configuration, for particulars on how to use Modbus, see next page.

Maintenance

REACT is maintenance-free. Cleaning should only be done by vacuuming with a brush nozzle or dry wiping with a damp cloth. When cleaning the duct system, REACT must be dismounted, unless cleaning hatches are situated near the unit. Cleaning tools, such as feather dusters or soft brushes and the like must not be drawn through the damper.

Commissioning – Flows

• REACT is factory-calibrated and preset for a nominal airflow.

• The set values can be read off the product, see label on the product.

• It is extremely important that the requirement for the lengths of straight duct upstream or downstream are complied with.

• Providing only half the required length of straight duct, may result in up to 20% lower accuracy in flow calculations.

Control signals

• REACT is preset for a signal range of 0-10 V DC (can be reset to 2-10 V DC).

• The Control of the air-flow, using a direct-wired room thermostat, is regulated by a control voltage of <0.5V for min. airflow and 10 V for max. airflow.

• When controlled from a HVAC central/controller, min/ max air-flow settings are controlled by limiting the control signal, i.e. 2,3 - 7,6 V DC.

• If wired to a controller, the REACT is normally set to

0-100% of its operating range.

• At 2-10 V control the following applies:

– 0 - 0.8 V closes the damper.

– 0.8 - 2 V controlls the the damper to min. air-flow.

Airflows

• REACT has a nominal air-flow, Q nom

for each size.

• Max. air-flow: 30-100% of Q nom

.

• Min. air-flow: 0-100% of Q nom

.

NOTE: Min. value must always be lower than max value.

• At Q min

a measured pressure of 1 Pa is obtained and a measurement accuracy of ±5-20 % of the flow.

Wiring examples

When REACT is used for constant-flow regulation, only 24

AC is connected to the controller. Below and on page 9-10, different wiring examples are given, showing different types of control configuration.

CAV – Constant-flow regulation

REACT

Y U

227VM SWN

1 2 3 4

N

AC/DC

L

Figure 21. The wiring diagram shows the connections for constantflow regulation. Q

min

= required constant-flow and Q

max

= 0 l/s.

7

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10

11

12

13

14

15

16

17

18

Display number

1

2

3

4

5

6

7

8

9

REACT

How to use Modbus

Modbus tables are available in a separate document (REACTa_Modbus-m).

Function

Adr (Modbus only)

V nom

Description

V min

V max

Test

Mode

Adr.

Enables you to set the actuator's Modbus address, by turning the "edit wheel". It is possible to set the address from 1 till 247. If you turn the value selector to end stop "+", the display will show a "2". This makes it possible to select the second level. If you select the second level, this is indicated in the display by a small circle.

The following functions are available at the second level:

Flow Return to previous level

Not used

Normally shows "OFF"

In order to start a test run, you have to turn the mode wheel to "ON".

Shows the angle of the rotation (0…255 digital 0....100%).

V nom

Used for selecting communication settings for Modbus. See table below.

Used for setting response delay for the Modbus communication (see separate documents)

Set V nom

according to the preset values for circular dampers and rectangular dampers according to the specification in Section 4.7, Calibration list. If 999 is shown in the display, it is possible to enter a userspecific V nom

. The V nom

value can only be set using the Gruner winVAV

Software (applies to the 15 Nm version only). No password is required when entering the first settings. After entering the first settings, you must set the password to 201 and wait until the display flashes; then enter another password.

9

10

11

12

13

14

15

16

17

EEPROM value

0

1

2

3

4

5

6

7

8

Communcation speed

1200

1200

1200

2400

2400

2400

4800

4800

4800

9600

9600

9600

19200

19200

19200

38400

38400

38400

None

Even

Odd

None

Even

Odd

None

Even

Odd

Parity

None

Even

Odd

None

Even

Odd

None

Even

Odd

1

2

1

2

1

1

2

1

1

Stopbits

2

1

1

2

1

1

2

1

1

8

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Function

Adr (Modbus only)

V nom

Description

V min

V max

Test

Mode

Adr.

Enables you to set the actuator's Modbus address, by turning the "edit wheel". It is possible to set the address from 1 till 247. If you turn the value selector to end stop "+", the display will show a "2". This makes it possible to select the second level. If you select the second level, this is indicated in the display by a small circle.

The following functions are available at the second level:

Flow Return to previous level

Not used

Normally shows "OFF"

In order to start a test run, you have to turn the mode wheel to "ON".

Shows the angle of the rotation (0…255 digital 0....100%).

V nom

Used for selecting communication settings for Modbus. See table below.

Used for setting response delay for the Modbus communication (see separate documents)

Set V nom

according to the preset values for circular dampers and rectangular dampers according to the specification in Section 4.7, Calibration list. If 999 is shown in the display, it is possible to enter a userspecific V nom

. The V nom

value can only be set using the Gruner winVAV

Software (applies to the 15 Nm version only). No password is required when entering the first settings. After entering the first settings, you must set the password to 201 and wait until the display flashes; then enter another password.

REACT

Room thermostat

REACT

1 2 3 4

RTC

A B

227VM

SWN

0..10 (2..10) V DC

AC/DC

RTCT

REACT

1 2 3 4

A B

227VM

SWN

N

L

120 Ω

*

1 = REACT supply air

2 = REACT extract air

= Modbus

Figure 22. The diagram shows how to wire a RTC room unit with simultaneous control of the extract air. The figure also shows an alternative with RTCT duct temperature sensor.

CO

2

and temperature control

DETECT Q 1 & 2

REACT

1 2 3 4

A B

227VM

SWN

0..10 (2..10) V DC

REACT

1 2 3 4 A B

227VM

SWN

AC/DC

Figure 23. The diagram shows how to wire the CO

2

sensor with combined DETECT Q temperature control and simultaneous control of the extract air.

Two-flow control with presence detector

REACT

1 2

Y U

3 4

A B

227VM

SWN

DETECT O REACT

1 2

Y

3

U

4

A B

227VM

SWN

N

L

120

Ω

*

1 = REACT supply air

2 = REACT extract air

= Modbus

AC/DC

N

L

120 Ω

*

1 = REACT supply air

2 = REACT extract air

= Modbus

Figure 24. The diagram shows how to wire the DETECT O presence detector with simultaneous control of the extract air. Twoflow control, min. or max. airflow.

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*

Should only be used on the last REACT in the Modbus loop

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REACT

VAV regulation with room thermostat and presence detector

RTC DETECT O

REACT

Y U

227VM SWN

1 2 3 4

REACT

1

Y U

2 3 4

227VM SWN

G0

G

Figure 25. The diagram shows how to wire a RTC room unit and DETECT O with simultaneous control of the extract air. VAV is used for occupancy, otherwise min. airflow. The figure also shows the alternative with RTCT duct temperature sensor.

VAV regulation and heat regulation with thermo-actuators

1 = REACT supply air.

2 = REACT extract air.

REACT

1 2

Y U

3 4

A B

227VM

SWN

RTC

* )

0..10 (2..10) V DC

RTCT

REACT

1 2

Y

3

U

4

A B

227VM

SWN

AC/DC

Figure 26. The diagram shows how to wire and refit jumpers of the RTC room thermostat enabling operation of the on/off 24 V VAC thermo-actuator on output YH (4).

*)

The jumper connection in the RTC must be changed when wiring the thermo-actuator (3) to the system. More information is available in the

Installation/Commissioning documentation for RTC.

NOTE: The unit must be de-energized before reconnecting any jumpers!

N

L

1 = REACT supply air

2 = REACT extract air

3 = Thermo-actuator, heat

= Modbus

120 Ω

*

*

Should only be used on the last REACT in the Modbus loop

Slave control with REACT CU as a master

REACT CU

Y U

1 2 3 5

REACT

Y U

1 2 3 4

227VM

SWN

0..10 (2..10) V DC

AC/DC

N

L

Figure 27. The diagram shows the connections between master – slave unit.

In this wiring configuration, the REACT slave controller should be set to a flow range of 0-100% of the nominal airflow.

10

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REACT

Diagram, true value voltage/airflow

The diagram only applies to factory-calibrated products for nominal air-flow, according to the

Air-flow and K-factor table. U always refers to Q nom

. NOTE! Does not indicate damper position.

U Volt

10

Ø100 Ø125

Ø160

Ø200

Ø250 Ø315 Ø400

8

Ø500

6

4

2

0

100 200 300 400 500 600 700

Dimension, air-flow and k-factors

800 900

All REACT variants - Standard, Modbus, spring return

1000

Circular version

400 x 200

500 x 200

600 x 200

700 x 200

800 x 200

1000 x 200

300 x 300

400 x 300

500 x 300

600 x 300

700 x 300

800 x 300

1000 x 300

400 x 400

500 x 400

600 x 400

Size

100

125

160

200

250

315

400

Q

Air-flow (l/s) min

*

5

Q nom

62

9 102

16

25

40

63

102

176

280

456

730

1200 k-factor

5.3

8.7

15.5

24.8

40.0

63.4

102.0

Torque (Nm)

5

10

5

5

10

5

5

500 164 1850 164.0

10

* At Q min

a measurement pressure of 1 Pa is obtained with a measurement accuracy of ± 5-20%

Rectangular version

(B = Width, H = Height)

Size

(B x H mm)

200 x 200

300 x 200

Q min

Air-flow (l/s)

Q nom

75

112

367

548 k-factor

33.5

50.0

Torque

(Nm)

5

5

398

454

568

304

382

458

373

170

228

284

340

149

187

224

262

297

1950

2224

2782

1490

1873

2246

1829

833

1117

1391

1665

728

915

1095

1282

1457

178.0

203.0

254.0

136.0

171.0

205.0

66.5

83.5

100.0

117.0

133.0

167.0

76.0

102.0

127.0

152.0

10

10

10

5

10

10

10

5

5

5

5

5

5

5

5

5

1100 1200 1300 1400 1500 1600

Rectangular version – continued

Size

(B x H mm)

700 x 400

Q min

534

Air-flow (l/s)

Q nom

2618

800 x 400

1000 x 400

1200 x 400

610

762

915

1400 x 400 1069

1600 x 400 1221

500 x 500

600 x 500

700 x 500

479

575

671

800 x 500

1000 x 500

767

959

1200 x 500 1149

1400 x 500 1342

1600 x 500 1534

600 x 600

700 x 600

691

807

800 x 600 921

1000 x 600 1152

1200 x 600 1382

1400 x 600 1614

1600 x 600 1845

700 x 700

800 x 700

944

1078

1000 x 700 1348

1200 x 700 1617

1400 x 700 1887

1600 x 700 2156

3757

4699

5631

6573

7515

3385

3955

4513

5642

2991

3735

4480

5236

5981

2344

2815

3286

6770

7909

9037

4623

5280

6606

7920

9246

10560

1700 1800 k-factor

422.0

482.0

603.0

723.0

844.0

964.0

309.0

361.0

412.0

515.0

618.0

722.0

825.0

214.0

257.0

300.0

343.0

429.0

514.0

600.0

686.0

239.0

273.0

341.0

409.0

478.0

546.0

1900 2000 l/s

Torque

(Nm)

15

15

15

15

15

15

15

15

15

10

10

15

15

10

15

15

15

15

10

10

10

10

10

10

15

15

15

11

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REACT

Checking performance – REACT

Checking the min. airflow

The easiest way to do this is by disconnecting the white cable marked 3. The damper will then move to the closed position.

Measure the voltage U (between cables 1 and 4)and calculate the airflow using the formulas on this page.

Checking the max. airflow

Use the room thermostat, or some other control equipment, to override the system so the control voltage will be a 10 V input on the white cable 3. As an alternative, you can short circuit between cables 2 and

3. This will command the controller to go to the preset max. airflow setting. Before short circuiting, you must disconnect the cable from the room controller. If this is not done, you will destroy the output on the control equipment. The damper will move to the open position.

Measure the voltage U (between cables 1 and 4) and calculate the airflow using the formulas on this page.

Gear release

The controller of the 227VM SWN has a gear release button, enabling the damper shaft to be turned manually. Spring return actuators on REACT GUAC are supplied as standard from the factory with the spring return of the damper set to de-energized/closed.

Mechanical opening/closing of the spring return actuator

Mechanical handling of dampers can only be performed if the actuator is de-energized. The supplied key (attached to the motor cable) or a 2.5 mm hex key, is used for mechanical handling.

REACT as a constant-flow controller

When REACT is used as a constant-flow controller, the min. flow setting is used as the set point for the constant airflow. Only 24 V AC, should be connected to cable pair 1 and 2.

Troubleshooting – REACT

Incorrect polarity on control signal zero conductor

It is important that the neutral conductor follows the entire chain of connections from thermostat to controller. Check this, by measuring the control voltage between cables 1 and 3 on the REACT. Correctly wired it should be possible to vary the signal between 0-10 V

DC. Incorrectly wired, the delivered signal is ~ 27.4 - 29.1 V DC.

Airflow does not correspond

Inaccurate air-flow is primarily due to disruptions in the duct system. Above all, the straight duct length requirements should be checked. If the ducting deviates from these requirements, the error can be as large as 20%. In systems with dusty air (mostly extract air systems) the unit's sensors can become soiled.

The sensor can be cleaned by blowing it with clean air in the opposite direction to the air-flow, i.e. in the tube connection. We recommend compressed air in a low-pressure aerosol tube. The duct must also be cleaned, to keep the measurement flange and the pressure tappings from blocking up.

Checking performance – REACT CU

Checking signals

Since the REACT CU only uses the controller’s airflow measurement feature, no settings are needed. It is the true value signal from terminal 5 that must be wired further to the slave unit. This is not affected by the settings on the min./max. potentiometers.

Measure the voltage, U (between cables 1 and 5), and calculate the airflow using the formulas below for the relevant signal system;

0-10 or 2-10 V DC. REACT CU is normally supplied with a 0-10 true value signal. Check the marking, to see if it should be set for 2-10

V. For Q nom

see the tables on page 11.

Y U

1 2 3 4

227VM SWN

4,00 V

V DC

Figure 28. How to connect a voltmeter to check the true value.

Formulas for calculating airflows.

A control signal of 0..10 V DC, gives the following formulas:

• To calculate the current actual flow (Q act know the value of the control signal (Y):

) when you

Q act

= Q min

+

Y

10 V DC

(Q max

– Q min

)

• To calculate the current true value (U) when you know the value of the actual flow (Q act

):

U = 10 V DC

Q act

Q nom

A control signal of 2..10 V DC gives the following formulas:

• To calculate the current actual flow (Q act know the value of the control signal (Y):

) when you

Q act

= Q min

+

Y – 2 V DC

8 V DC

(Q max

– Q min

)

• To calculate the current true value (U) when you know the value of actual flow (Q act

):

U = 2 V DC + 8 V DC

Q

Q act nom

Explanations of the formulas above:

Y = Control signal in [V] DC

U

*

= True value signal in [V] DC

Q act

= Actual flow in [l/s]

Q min

= Required min. airflow in [l/s]

Q max

= Required max. airflow in [l/s]

Q nom

= Nominal flow in [l/s], see tables page 11.

* Always refers to Q nom

. NOTE! Does not indicate damper position.

12

Swegon reserves the right to alter the specifications. 20160307 www.swegon.com