VHB - VAV diffuser

Square supply air for draught free ventilation

Exposed square active diffuser for variable airflows, which works in constant pressure duct system.

  • Installation for suspended ceiling
  • Stable throw length with variable supply airflow rates
  • Wide supply air temperature range
  • Suitable for systems with constant static pressure ductwork system
  • Designed for use with the VRI/V plenum
  • Maximum flow rate adjustment and measurement section available for supply (MSM)
  • Minimum airflow between10…15 l/s for sizes 160…250
  • airflow control with actuator, 24 VAC, signal 0-10V

 

ACCESSORIES

  • Balancing plenum VRI/V with connection cable

The active diffuser shall be made of painted steel with a white (RAL 9010) standard colour.
Air shall be introduced into the space through the side slots and perforated front panel, ensuring a high mixing rate. The diffuser shall maintain appropriate discharge velocity throughout the total airflow range.

The diffuser shall be connected to a balancing plenum designed for the active diffuser installation and equipped with a measurement and adjustment module.

The diffuser shall have a rubber gasket to ensure tight connection to the plenum.

Halton VHB

Active square VAV diffuser

  • Installation for suspended ceiling
  • Stable throw length with variable supply airflow rates
  • Wide supply air temperature range
  • Suitable for systems with constant static pressure ductwork system
  • Designed for use with the Halton TRI/V plenum
  • Maximum flow rate adjustment and measurement section available for supply (MSM)
  • Minimum airflow between 10…15 l/s for sizes 160…250
     

Accessories

  • Balancing plenum TRI/V with connection cable

Dimensions

NS  W  H  H1  ØD 
160  299 234 98 159
200  449 267 104 199
250  449 275 116 249

Dimensions with Halton TRI/V plenum

NS  VRI/V  L  L1  H  H1  K  ØD  ØD1 
160  160...160 458 299 222 96...126 432 159 162
200  200...200 618 449 272 100...130 592 199 202
250  250...250 618 449 336 111...141 592 249 252

 

Material


MATERIAL AND FINISHING

PART  MATERIAL  FINISHING  NOTE 
Upper plate Steel Powder painted, white RAL 9010  
Front panel Perforated steel Powder painted, white RAL 9010  
Control cone Steel Powder painted, black  
Gasket Rubber    

Accessories


ACCESSORIES

Actuator

In the standard delivery the VHB is always equipped with a Siemens GDB161.2E/HA damper actuator.

ACTUATOR  FORCE  CONTROL
SIGNAL
 
OPERATING
VOLTAGE
 
POWER
CONSUMPTION
 
GDB161.2E/HA 125 Nm 0...10 VDC 24 VAC 3VA


Function


FUNCTION



The VHB is an active ceiling diffuser for supply air.
Air is supplied to the room space mainly through the side slots of the diffuser. The air jet supplied horizontally through the side slots induces room air.
The unit maintains a high outlet air velocity between the minimum and maximum airflow rates, creating comfortable conditions and low residual air velocities in the occupied zone.
In the demand-based ventilation (DBV) and variable air volume (VAV) systems, room conditions can be guaranteed to be without a risk of draughts, at both the maximum and minimum airflow rate.
The pressure dependent function of the VHB operates in combination with a constant pressure duct zone.
An external room controller varies the room airflow rate by running the VHB diffuser actuator with a standard 0…10 VDC control signal.

Related Products


VRI/V PLENUM FOR SUPPLY AIR



Use of the VHB is most beneficial with a VRI/V plenum. The VRI/V plenum includes:
  • A measurement and adjustment module MSM

  • An electric junction box for power and control signal supply as well as an cable for easy connection of the variable air diffuser VHB

  • Installation safety and hanging wire for air diffuser


Installation


INSTALLATION



The active diffuser shall be installed in conjunction with the VRI/V plenum box. The VRI/V plenum shall have a safety distance of 3D minimum upstream, to ensure reliable measurement and accurate control of the airflow rate.

A hanging and safety wire for VHB diffuser is delivered with the VRI/V plenum. Hang the VHB diffuser to the wire by means of a key ring.

VHB is connected electrically to VRI/V with ready assembled cable plug.

Control that the actuator settings are in line with the factory pre-setted DIL switches.



Release the actuator clutch and pull the control cone to the fully open position.

Mount the VHB diffuser assembly to the VRI/V plenum box.

Note: The technical performance for the combination of supply air diffuser and plenum is presented separately for the two different installations.


Dimensions of installation hole in suspended ceiling



NS  ØD2 
160  211
200  265
250  333


Wiring


WIRING DIAGRAM


Junction box  Cable connection plug

Control signals in junction box

Terminal 3
  • 0 VDC  = minimum position / airflow

  • 10 VDC  = maximum position / airflow


Terminal 4 (feedback from actuator)
  • Not connected


Commissioning

Commissioning


Halton VHB




Make sure that the control cone of each active Halton VHB (and VHD) damper is fully open (at the lowest position). This can be done either mechanically or electrically: 

  • If the power is not connected to active diffuser, release the actuator clutch and pull the control cone to the fully open position.
  • If a 24 VAC power supply is connected to diffusers, please make sure that the control signal is constantly at 10 VDC.
     

Check that the duct zone constant pressure is at the intended level (for example, between 30 and 50 Pa).

If the duct zone pressure is too low and the zone pressure control damper is fully open, you should either adjust the supply fan pressure setpoint to be higher or adjust the MSM adjustment unit in the Halton VRI/V plenum.

The zone pressure control damper shall have a sufficient operative differential pressure over the damper (for example, 30 Pa or more).
 

Adjustment

The airflow rate of the active diffuser is measured and adjusted using the MSM module inside Halton VRI/V plenum.

Attach the measurement instrument to the measuring tubes on Halton VRI/V plenum and the airflow rate is calculated using the pressure difference reading and the k factor.
 

      

qv           Calculated airflow rate (l/s)
k              k factor from the table
Δpm         Measured pressure (Pa)
 

NS k factor
160 15.9
200 26.2
250 44.5


If the airflow rate of the active diffuser is too high, adjust the position of the MSM adjustment unit in the Halton VRI/V plenum to closer position. If maximum airflow can't be reached, open MSM module first full open and if this is not enought, increase the duct zone pressure

The minimum airflow is factory pre-adjusted. 

Servicing


SERVICING

Open the diffuser part and detach the perforated plate of the coupling sleeve. Remove the control cone part completely.

Loosen two screws which are holding the motor assembly on VHB body and let it hang on the wire.

The MSM is removed through VRI/V outlet by pulling from it's body - not the measurement tubes or control spindle.

Clean the parts with a damp cloth, instead of immersing in water.

Replace all parts in opposite order.

Specification


SUGGESTED SPECIFICATIONS

The active diffuser shall be made of painted steel with a white (RAL 9010) standard colour.
Air shall be introduced into the space through the side slots and perforated front panel, ensuring a high mixing rate. The diffuser shall maintain appropriate discharge velocity throughout the total airflow range.

The diffuser shall be connected to a balancing plenum designed for the active diffuser installation and equipped with a measurement and adjustment module.

The diffuser shall have a rubber gasket to ensure tight connection to the plenum.


Product Code


PRODUCT CODE


VHB-D

   D = Connection size
    160, 200, 250


Specifics and accessories

   CO = Colour
    W  White
    X  Special colour

Code example

   VHB-160, CO=W


Sub products

   VRI/V  Plenum


Downloads & Media

Halton VHB - fi
Type
Datasheet
Language
Finnish (Finland)
Size
903.5 kB
Halton VHB - ru
Type
Datasheet
Language
Russian (Russia)
Size
930.2 kB
Halton VHB - se
Type
Datasheet
Language
Swedish (Sweden)
Size
899.7 kB
Halton VHB - nl
Type
Datasheet
Language
Dutch (Belgium)
Size
901.2 kB
Halton VHB - fr
Type
Datasheet
Language
French (France)
Size
840.5 kB
Halton VHB - gb
Type
Datasheet
Language
English (United Kingdom)
Size
899.5 kB