PDA - Plenums

Plenum for diffusers

Plenum for DAC.

  • Plenum for connecting DAC diffuser (supply, exhaust,filtration) unit to ductwork
  • Ensures proper function of the supply air diffuser
  • Access for ductwork cleaning
     

PRODUCT MODELS & ACCESSORIES

  • Model with sound attenuation material
  • Detachable airflow rate measurement and balancing module available.

The plenum shall be made of galvanised steel.

The plenum shall comprise an airflow measurement and adjustment module.

The plenum shall comprise sound attenuation material made of mineral wool.

The plenum reduces duct pressure and air velocity in order to supply air throughout the entire face area of the DAC diffuser and improve the air distribution quality and the noise level.

Introduction


PDA

Plenum for DAC diffuser 


 

  • Plenum for connecting DAC diffuser (supply, exhaust,filtration) unit to ductwork
  • Ensures proper function of the supply air diffuser
  • Access for ductwork cleaning
     

Product Models & Accessories

  • Model with sound attenuation material
  • Detachable airflow rate measurement and balancing module available.
     

Dimensions

DIMENSIONS

PDA/H

Nb : For plenum without filter (PDA/H-S and PDA/H-R), the height is reduced to D+50

 

PDA/V


Nominal dimensions L
600x600 595
675x675 670

Material

 MATERIAL AND FINISHING

PART MATERIAL NOTE
Plenum box / spigot Galvanised steel  
Sound attenuation material Mineral wool The mineral wool is fixed
with nails
Filter Media G3  


Accessories

 ACCESSORIES

ACCESSORY CODE DESCRIPTION
Sound attenuation material IN Mineral wool in the PDA/H plenum on 2 sides (IN=2)
Sound attenuation material IN Mineral wool in the PDA/H plenum on 5 sides (IN=5)
Sound attenuation material IN Mineral wool in the PDA/V plenum on 4 sides (IN=5)
Airflow measurement and
adjustment unit
OM For supply installation


Function

 FUNCTION

 



The duct pressure and air velocity are reduced inside the PDA plenum.
Air is supplied into the space through the diffuser, improving the air distribution quality and the noise level.
The airflow rate can be adjusted using the optional measurement and adjustment module MSM.

Installation

 INSTALLATION



 

  1. Plenum
  2. Spigot
  3. Clips
  4. Front plate

Plenum installation
The plenum is installed into the suspended ceiling with M8 drop rods (not supplied in the delivery) and connected to the ductwork with a spigot.
When equipped with a measurement and adjustment module, the recommended safety distance upstream of the device is at least 3xD, in order to ensure a reliable airflow rate measurement.
The units control spindle must not be excessively bent.

Diffuser installation
For integral diffusers with 600x600  tiles, the diffuser is attached to the plenum via clips.
For integral diffusers with 675x675 tiles, the diffuser is attached to the plenum with screws or pop rivets (not supplied). 

Adjustment

 ADJUSTMENT 

To aid in adjusting and measuring the air flow rate, it is recommended that the diffuser is connected to a plenum equipped with a MSM.
The supply air flow is determined by measuring the pressure difference with a measurement module.
Measure the differential pressure with a manometer. The air flow rate is calculated according to the following formula:
 

where:

∆Pm is the measured pressure (Pa)
is a factor given as a function of mounting and diameter
Qv is the airflow rate

 

The k factor for installations with different safety distances (distance of other items from the MSM):

  Safety distance
Sigot Diameter > 6XD min 3XD
200 28 32
250 49 51
315 78 -


Adjust the air flow rate by rotating the control spindle until the desired setting is achieved.
Lock the damper in position with a screw.
Replace the tubes and spindle in the plenum, and return the diffuser to its position.

Servicing

 SERVICING

 

Supply and exhaust without filter
Detach the diffuser, clean the parts by wiping with a damp cloth.
Push the diffuser back into place by clipping the plenum.

Exhaust with filter
Activate the push-pull system by pressing on the diffusers’ front panel.
Open the front panel and rotate 90°.
Rotate the brackets 90°, and pull out the filter.
Install a new filter in the same position, close the front panel by pressing the push-pull release.

Option: MSM
Remove the measurement and adjustment module by gently pulling the shaft; (not the control spindle or measurement tubes!).
Wipe the parts with a damp cloth, instead of immersing in water.
Reassemble the measurement and adjustment module by pushing the shaft back into place until the module meets the stopper.
Push the diffuser back into place.

  

Specifications

SUGGESTED SPECIFICATIONS

  • The plenum shall be made of galvanised steel.
  • The plenum shall comprise an airflow measurement and adjustment module.
  • The plenum shall comprise sound attenuation material made of mineral wool.
  • The plenum reduces duct pressure and air velocity in order to supply air throughout the entire face area of the DAC diffuser and improve the air distribution quality and the noise level
     

Product Code

 PRODUCT CODE

PDA/S-C-XXX-D IN= OM=

S = Configuration

   V  Vertical
   H  Horizontal

C = Application
   S Supply
   R Return
   F Filtration (opening front)   

 XXX = False ceiling dimensions 
   600 : 600x600
   700 : 675x675    

D = Diameter
   200 : 200mm diameter spigot
   250 : 250mm diameter spigot
   315: 315mm diameter spigot   


Other options and accessories

IN = Insulation
   2 : 2 face insulation (PDA/H)
   4 : 4 face insulation (PDA/V)
   5 : 5 face insulation (PDA/H)

 OM = MSM
   N : No
   Y : Yes
   

Downloads & Media

Halton PDA - fr
Type
Datasheet
Language
French (France)
Size
1,2 MB