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BOCaLow velocity terminal with BOOSTER

GeneralBOC Booster is designed for both temperature controlled and mixing ventilation. The rooms are normally sup-plied with under tempered air. When heating is required the supply air temperature is increased and the BOC is switched to Booster level, and the warm air is pressed down into the room by the Booster nozzles.

Quick factsFor rooms heated by air

Electric actuator or manual setting

For rooms with high ceilings

Requires no floor space

Included in the MagiCAD and CadVent databases

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Quick guideA I R F L O W - S O U N D L E V E L

BOCa l/s

Size 30 dB(A) 35 dB(A) 40 dB(A)

200 �80 2�5 250

250 260 300 350

3�5 375 440 5�0

400 590 690 790

500 9�0 �0�5 �300

630 �400 �600 �800

Data apply to open damper and �6 dB room damping (�50 m² equivalent absorption area. All values is valid without distrurbance on straight duct section.)

Heating principles.

Cooling principle.

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BOCa

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Technical descriptionDesignBOC is designed for rooms with high ceilings such as industrial premises, large shops, sports halls etc. It has an octagonal shape and the upper section of the terminal next to the connection spigot is equipped with the aero-dynamic discs which are unique to our products.

The lower section has a perforated, removable front cover. Inside this there is a distribution plate which is equipped with flexible distribution system, Varizon®.

The disc section and the perforated section are separated by a damper function. This is controlled by means of an electric motor (�) or manual control (2). BOC is mounted to a wall or pillar using the brackets supplied with the terminal.

Materials and surface treatmentBOC is manufactured in galvanized sheet steel. The discs are manufactured in S/ABS plastic and the Varizon® system in PP. The whole terminal unit is powder painted in a dusty grey shade, RAL 7037. The unit is also available in other standard colours: White aluminium RAL 9006, jet black RAL 9005, grey aluminium RAL 9007 and signal white RAL 9003 (NCS 0500).

Special versionsBesides the standard range, it is possible to adapt the product to customer specifications. Please contact your nearest sales office for more information.

AccessoriesCRM 1Commissioning damper with measuring unit for commis-sioning the air volume.

MDBManual damper control

VHC controller:VHC controller resets motor controlled diffusers intended both for cooling and heating with supply air. The control-ling parameter is the temperature difference between supply air and room air. See separate product sheet for VHC.

InstallationMounting brackets (3) are supplied. These are fastened to the wall and then to BOC. See figure �.

PlanningBOC is designed to be mounted at a height of 2.5 – 5 m, measured from floor level to the lower edge of the termi-nal. The height is related to the size of the terminal, the volume of air and temperature drop (see technical data). The changeover damper is most simply controlled from the air handling unit which gives the current supply air temperature. A control signal may also be taken from a duct sensor.

N.B. The sound level in he engineering diagram's is valid at �50 m2 equivalent sound absorption area. This fact makes it important to check the air velocities in the con-necting ducts to the terminals. Extra consideration has to be taken on how the ducts can be connected to the terminals. See figure 4.

CommissioningThe airflow is commissioned using the adjustable measur-ing unit (4) which is placed in the duct before the BOC unit. See figure �.

MaintenanceBOC is cleaned when necessary using lukewarm water with detergent added. Access to the inner parts is possi-ble via the removable perforated front plates.

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

Figure 1. Installation.

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BOCa

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ConnectionVHC is connected to a 24 AC power supply according to wiring diagrams, Figure 2 and figure 3.

Key to Figure 2� = VHC control unit 2 = Duct temperature sensor (DT) 3 = Room temperature sensor (RT) 4 = Setting the switch over temperature

Figure 2. The wiring diagram shows the supply terminal connec-tions for a Sauters damper actuator fitted to the BOC.

Key to Figure 3� = VHC control unit with duct temperature sensor 2 = Room temperature sensor 3 = Connection box, not included 4 = Fixed actuator cable 0,4 m

Figure 3.

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BOCa

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SizingSound level dB(A) applies to rooms with �50 m² absorption area and measured 2 m from the dis-placement unit and with at a straight section without distrurbance on straight duct section.

Data for electric motor Sauter ASM ��4 SF 24 V Supply voltage AC 24 V Power consumption 5 VA Operating time �20 sek (50 Hz)

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Figure 4. E.g. of how different duct connections affect thesound level of the terminal. See also the Technical chapter under Acous-tics - Planning Tips.

Table duct connections.

Duct connections

m/s A B C D

4-5 m/s + 2 + 6 + 3 + 3

6-8 m/s + 4 + �0 + 6 + 6

Effects on sound levels (dB) for different duct connections and different equivalent sound absorption areas, �50 and �0m.

Sound data - BOCSound power level L

w(dB)

Table KOK

Size Mid-frequency (octave band) Hz

BOCa 63 �25 250 500 �000 2000 4000 8000

200 �7 �5 �6 �5 �2 2 -�2 -�4

250 �5 �7 �6 �8 �� 0 -�3 -�5

3�5 �5 �7 �6 �8 �0 -2 -�3 -�0

400 �8 �8 �9 �6 9 -3 -�4 -�2

500 �8 �7 �8 �6 �0 -2 -�3 -��

630 �9 20 �9 �6 8 -3 -�� -7

Tol. ± 2 2 2 2 2 2 2 2

Sound attenuation DL (dB) Table DL

Size Mid-frequency (octave band) Hz

BOCa 63 �25 250 500 �000 2000 4000 8000

200 �6 �2 6 2 2 3 5 4

250 �5 �0 5 2 2 3 4 5

3�5 �4 9 4 � 0 � 2 2

400 �0 6 4 � � � � �

500 8 4 3 � � � � �

630 6 3 2 � � � 0 0

Tol. ± 2 2 2 2 2 2 2 2

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BOCa

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Dimensioning graphs - BOC- Supply air Airflow - Throw - Over temperatures

The graphs must not be used for commissioning.

The graphs show the airstream penetration depth in the room measured from the lower edge of the termi-nal.

Example: At an airflow of 660 l/s from a BOC 400, a downward penetration depth of 3.0 m is obtained at +5ºC over-tem-perature. If +�0ºC over-temperature is desired, the penetration depth decreases by a factor of 0.66, i.e. 3.0 m x 0.66 = �.98 m.

Penetration depth (m) at +5 °C over temperature.

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Correction factor for other over temperatures (kf)

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BOCa

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Dimensioning graphs - BOC - Supply air - Wall mountedAirflow - Affected zone - Under temperature

The graphs must not be used for commissioning.

The graphs illustrate the affected zone a0,20

and b0,20

for the selected size, airflow and mounting height. The affected zone refers to the distance to the isovel limit 0.2 m/s at a given Dt. In this case Dt designates the dif-ference between the room air temperature measured �.2 m above the floor and the supply air temperature. N.B. not the difference between supply and exhaust air temperature.

Example: Decide mounting height and terminal size. BOC 3�5 with a mounting height of 3.2 m has a 4 m affected zone a

0,2 & b

0,2 at an airflow of l/s 240

6 m affected zone a0,2

& b0,2

at an airflow of l/s 360

If other affected zones are required, the following

formula may be used:

q = required air flow

a = required affected zone

q = air flow at known affected zone

a = known affected zone

Example:

Data at Dt -6°C are calculated in accordance with: a

0,20Dt 3° x �,25

Affected zone - wall mounting at Dt = 3°C

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BOCa

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Dimensioning graphs - BOC- Supply air - Free suspensionAirflow - Affected zone - Under temperature

The graphs must not be used for commissioning.

The graphs illustrate the affected zone a0,20

and b0,20

for the selected size, airflow and mounting height. The affected zone refers to the distance to the isovel limit 0.2 m/s at a given Dt. In this case Dt designates the dif-ference between the room air temperature measured �.2 m above the floor and the supply air temperature. N.B. not the difference between supply and exhaust air temperatures.

Example: Decide mounting height and terminal size. BOC 3�5 with a mounting height of 3.4 m has a 4 m affected zone a

0,2 & b

0,2 at an airflow of l/s 500

6 m affected zone a0,2

& b0,2

at an airflow of l/s 750

If other affected zones are required, the following formula may be used:

q = required air flow

a = required affected zone

q = air flow at known affected zone

a = known affected zone

Example:

Data at Dt -6°C are calculated in accordance with: a

0,20Dt 3° · �,25

Affected zone - free suspension at Dt = 3°

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200 250 315400

500 630

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BOCa

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Dimensioning graphs - BOC Airfl ow - Pressure drop - Sound levels

The graphs must not be used for commissioning.

The graph shows data for sound levels in a room with an equivalent absorption area of �50 m 2 and measured 2 m from the displacement unit and with at a straight section without distrurbance on straight duct section. See fi gure 4 how different duct connetions will affect the sound level.

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BOCa 200 pt Papt Pa

200 300 400 500 1000 m3/h

pt Papt Pa

40 50 100 200 300 l/s 400345

10

20

304050

100

2025

3035

40 dB(A)

BOCa 250 pt Papt Pa

400 500 1000 2000 m3/h

pt Papt Pa

100 200 300 400 500 l/s 10002

345

10

20

304050

100

2025

3035

40 dB(A)

BOCa 315 pt Papt Pa

400 500 1000 2000 m3/h

pt Papt Pa

100 200 300 400 500 l/s 10002

345

10

20

304050

100

2025

3035

40 dB(A)

BOCa 400 pt Papt Pa

1000 2000 3000 4000 m3/h

pt Papt Pa

200 300 400 500 1000 l/s2

345

10

20

304050

100

2025

3035

40 dB(A)

BOCa 500 pt Papt Pa

1000 2000 3000 4000 5000 m3/h

pt Papt Pa

200 300 400 500 1000 l/s 20002

345

10

20

304050

100

2025

3035

40 dB(A)

BOCa 630 pt Papt Pa

2000 3000 4000 5000 10000 m3/h

pt Papt Pa

400 500 1000 2000 3000 l/s 40002

345

10

20

304050

100

2025

3035

40 dB(A)

The dB(C) vaule is normally 6-9 dB higher than the dB(A) value. For more accurate calculations, refer to the calculation template in the technical section in the chapter on Acoustics.

The graph shows the pressure line for open booster damper. When the damper is closed, the sound level increases by approx. 5 dB and the total pressure by approx. 8 Pa.

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BOCa

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Dimensions and weightsSize A B C ØD E Weight, kg

200 �300 320 �7 200 264 �8.0

250 �400 353 �7 250 28� 2�.0

3�5 �500 38� �7 3�5 295 23.0

400 �600 464 �7 400 336 29.0

500 �800 6�2 �7 500 4�0 35.0

630 2000 762 �7 630 485 45.0

Figure 5. BOC.

Order keyProduct

Combination terminal with boosterfunction

BOCa -aaa -b

Size: 200, 250, 3�5, 400, 500, 630

With electrical motor mounted: �

With mounted manual damper control MDB: 2

Alternative electric motor: Specify clearly.

Accessories

Commissioning damper with measuring unit

CRMc � -aaa - �

Size: 200, 250, 3�5, 400, 500, 630

Manual damper control MDBa

Controller VHCa

Specification example SD XX Swegons octagonal low velocity terminal with built-in forcing function of type BOCa Booster, with the following functions:

Adjustable spread pattern and near zone

Non-fouling

Designed for both under-temperature and over-tem-perature air

Mounting brackets included

Inbuilt switchover of air supply method

Cleanable

Powder-coated in white

Accessories:

Commissioning damper with measuring unit

CRMc � - aaa - � xx items

Size: BOCa aaa - b xx items

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