PLC - Plenum

Plenum for diffusers

Easy to install and clean.

  • Plenum for connecting SLL and SLN linear slot diffuser supply/exhaust unit to ductwork 
  • Ensures proper function of the supply air diffuser 
  • Access for ductwork cleaning

PRODUCT MODELS & ACCESSORIES

  • 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 diffuser shall be detachable in order to provide access to the measurement and adjustment module in the plenum.

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

The plenum shall reduce duct pressure and air velocity in order to spread the supply air evenly in the diffuser and improve the air distribution quality.

Introduction


PLC

Plenum (Ceiling Diffusers)
 


 

  • Plenum for connecting ceiling diffuser/exhaust 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 adjustment module available.
     

Dimensions

DIMENSIONS


 

NS W W1 W2 H ØD ØD1
100 300 340 63 225 99 102
125 300 340 63 225 124 127
160 300 340 63 225 159 162
200 450 490 63 315 199 202
250 450 490 63 315 249 252
315 500 540 63 465 314 317
355 500 540 63 465 354 357
400 500 540 63 465 399 402
450 650 690 63 665 449 452
500 650 690 63 665 499 502
560 650 690 63 665 559 562
630 750 790 63 680 629 632

Material


MATERIAL AND FINISHING

PART  MATERIAL  NOTE 
Plenum / spigot Galvanised steel  
Insulation Mineral wool The mineral wool is fixed with nails


Accessories


ACCESSORIES


ACCESSORY  CODE  DESCRIPTION 
Balancing plenum PLC For balancing & equalising the airflow
(with airflow adjustment and measurement unit)
Sound attenuation I3 Mineral wool in the
PLC plenum on 3 sides
Sound attenuation I5 Mineral wool in the
PLC plenum on 5 sides
Airflow measurement and
adjustment unit
MSM For supply installation
(for spigot with diameter <= 315)


Function


FUNCTION




The duct pressure and air velocity are reduced inside the PLC plenum.
Air is spread evenly in the diffuser ensuring proper air distribution function.
The airflow rate can be adjusted using the optional measurement and adjustment module MSM.

Installation


INSTALLATION




CODE  DESCRIPTION
1  PLENUM
2  MEASUREMENT AND ADJUSTMENT MODULE

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

Adjustment


ADJUSTMENT

In order to enable airflow adjustment and measurement of airflow rate, it is recommended that the diffuser be connected to the plenum equipped with the MSM module.
The supply flow rate is determined by using the measurement and adjustment module MSM.

Detach the diffuser and pass the tubes and control spindle through the diffuser.
Replace the diffuser.
Measure the differential pressure using a manometer. The flow rate is calculated using the formula below.


Adjust the airflow rate by rotating the control spindle until the desired setting is achieved.
Lock the damper position with a screw.
Replace the tubes and spindle into the plenum and replace the diffuser.

K -factors for installations with different safety distances (D= duct diameter)

PLC  >8xD  min 3xD 
125  9.9 12.6
160  16.9 21.9
200  28.3 31.0
250  47.9 51.5
315  78.6 -

Servicing


SERVICING

Remove the measurement and adjustment module by gently pulling the shaft (not the control spindle).
Wipe the parts with a damp cloth, instead of immersing in water.
Remount the measurement and adjustment module by pushing the shaft back into place until the module meets the stopper.

Specification


SUGGESTED SPECIFICATIONS

The plenum shall be made of galvanised steel.

The plenum shall comprise an airflow measurement and adjustment module.
The diffuser shall be detachable in order to provide access to the measurement and adjustment module in the plenum.

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

The plenum shall reduce duct pressure and air velocity in order to spread the supply air evenly in the diffuser and improve the air distribution quality.

Product Code


PRODUCT CODE


PLC-D-IS

   D = Connection size
    100, 125, 160, 200, 250, 315, 355, 400, 450, 500, 560, 630

   IS = Sound attenuation material (mineral wool)
    N  No attenuation material
    I3  Sound attenuation material on 3 sides
    I5  Sound attenuation material on 5 sides


Specifics and accessories

   MS = Measurement/adjustment module MSM
    N  No
    Y  Yes

Code example

   PLC-100-N, MS=N
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