Halton WDD – Universal grille

Overview

• For cooling and heating applications; suitable also for exhaust
• Adjustable vertical and horizontal vanes
• Aluminium construction

Accessories

• Wax-bulb actuator for directing the supply air jet in heating operation
• Airflow adjustment damper
• Plenum options with measurement and adjustment functions
• Installation frame

Dimensions

Halton WDD, rounded frame (R)

Halton WDD, flat frame 22 mm (F)

Halton WDD, flat frame 30 mm (F2)

With OD (airflow adjustment damper) total depth is 48 mm + 45 mm.

Special dimensions

In addition to these standard sizes, other dimensions are available by special order.
The maximum size is 1500 mm x 600 mm (LxH).

Structure and materials

The bevel angles of the outer frame have been welded so that the joints are almost invisible.

Features and options

Wax-bulb actuator

In applications, where both heating and cooling are provided, the air pattern can be changed automatically via the wax-bulb actuator.

The wax-bulb actuator alters the angles of the horizontal rear vane depending on the supply air temperature. Neither auxiliary energy nor dedicated control system are needed.

When cold air is supplied at a temperature up to 18 °C the supply jet is horizontal. The vane angle is 0°. As the supply air temperature rises, the actuator piston progressively changes the angle of the rear vanes to direct the supply air jet downwards. Vane angle reaches 45° in 10 to 20 minutes.

No maintenance is required for the wax-bulb actuator.

Product models

Halton WDD, rounded frame (R)

Halton WDD, flat frame (F, F2)

Operating principle

Supply air is supplied with horizontal and vertical deflection through the vanes into the space. The supply air mixes with the room air in front of the grille.

The supply air is directed with the horizontal adjustable vanes.
Moving the vertical vanes can change the length and form of the flow pattern.

In wall installations, the recommended distance from the ceiling is 200 mm, when the supply air is directed to the ceiling.The rear vane angle can also be controlled by optional wax-bulb actuator.

The Halton WDD grille can also be used for exhaust.

Installation

For ceiling installation, we recommend using visible screw fastening. The auto screws, 4.2×25 are supplied.

The grille is connected to the circular duct using either a Halton PRL balancing plenum or a Halton BDR plenum or alternatively directly to the rectangular duct using the IF/WDD installation frame.

Installation frame, IF/WDD             Balancing plenum, PRL          Plenum box, BDR

Fastening options

Clips, as standard (CL)

The grilles are delivered with clips fastening as standard.
Clips fastening is used with Halton PRL, Halton BDR and IF/WDD.

Concealed screw (CC)

Concealed screw fastening is possible when the grille is installed with an IF/WDD installation frame or with a Halton BDR plenum, not with a Halton PRL balancing plenum.

Pre-drilled screw holes are integrated into the Halton BDR for ease of installation.

For ceiling installation, concealed screw fastening is recommended.

The dimensions of the installation holes are LxH when an installation frame is used, and (L-5) x (H-5) without installation frame.

Visible screw (SF) – Frame 30×48 mm (F2)

Commissioning

Supply

In order to enable airflow adjustment and measurement of airflow rate we recommend connecting the diffuser to a Halton BDR plenum or Halton PRL balancing plenum equipped with the MSM module. The supply flow rate is determined by using the measurement and adjustment module MSM.

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

where

• q_v           Airflow rate [l/s] or [m³/h]
• ∆p_m      Measured pressure [Pa]
• k            The k-factor given as a function of mounting and diameter (see the table 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 grille.

The k-factor for installations with different safety distances
(D= duct diameter)

Exhaust

The airflow rate is selected by measuring the pressure difference between the measurement tap on the Halton PRL balancing plenum or Halton BDR plenum and theroom air.

The corresponding airflow rate is calculated and can be adjusted by turning the control spindle of the adjustment unit MEM.

Airflow adjustment damper OD

The airflow rate can also be adjusted by turning the damper blades behind the grille with a screwdriver. The measurement is carried out when grille is installed.

Maintenance

Remove the grille by gently drawing it out by the frame. Use a screwdriver if necessary. Clean the parts by wiping them with a damp cloth.

Push the grille back into place until the springs lock (or fix by screwing on the concealed screws).

Option with balancing plenum

Remove the measurement and adjustment module by gently pulling the shaft (NB notthe control spindle). Wipe the parts with a damp cloth, instead of immersing in water.

Remount the measurement and adjustment module by pushing in the shaft until the module meets the stopper.

Push the grille back into place so that the clips lock.

Specification

The grille is made of extruded aluminium, with an anodised or epoxy-painted with a white (RAL9003) standard colour.
The bevel angles of the outer frame are welded so that the joints are almost invisible.

The Halton WDD grille has horizontal and vertical adjustable vanes. The rear vanes direct the supply air jet horizontally. The length and form of the air pattern are adjusted by turning the front vanes.

The supply air jet shall be controlled according to supply air temperature by a waxbulb actuator.

The grille can be connected to the ductwork using a balancing plenum, which comprises sound attenuation material made of polyester fibre or mineral wool with a washable surface.

The plenum comprises an airflow measurement and adjustment unit.
The grille is removable in order to provide access to the measurement and adjustment module in the plenum.

Order code

WDD-L-H; FM-VP-FS-FI-CO-ZT-AC

L = Length [mm]
200, +1, .., 1500

H = Height (mm]
100, +1, .., 600

Other options and accessories

FM = Frame model
R        Rounded
F        Flat (22 mm)
F2      Flat (30 mm)

VP = Vane positioning
V       Vertical at front
H        Horizontal at front

FS = Fastening
CL      Clips
SF       Screw fastening
CC      Concealed screw fastening

FI = Finishing
PN      Painted
AN      Anodised
MF      Mill finished

CO = Colour
SW      Signal white (RAL 9003)
X         Special colour (RAL xxxx)

ZT = Tailored product
N         No
Y         Yes (ETO)

AC = Accessories
IF       Installation frame
OD     Opposed blade damper
WM   Wax-bulb actuator

Sub products

BDR   Plenum
PRL   Plenum

Order code example

WDD-200-100; FM=R, VP=V, FS=CL, FI=AN, CO=N, ZT=N, AC=IF