Variable air volume active supply diffuser for Halton Workplace systems. Suitable for demanding office conditions.
|Diffuser plate||Steel||Powder painted,
|Special colours available|
|Front panel||Steel||Powder painted,
|Special colours available|
|Control cone||Steel||Powder painted,
|Plenum casing||Galvanised steel||–||–|
|Control box||Galvanised steel||–||–|
|Spigot with gasket||Galvanised steel||–||Gasket of rubber compound|
The Halton Jaz Conical VAV is an active ceiling diffuser for supply air in variable conditions.
Air is supplied horizontally to the room space mainly through the slots of the diffuser.
The room air will circulate through the perforation in the front panel to the sensors located inside the diffuser.
The unit maintains a nearly constant outlet air velocity between the minimum and maximum airflow rates, create comfortable conditions and low residual air velocities in the occupied zone. Room conditions can be guaranteed without a risk of draughts, at both the maximum and minimum airflow rate.
Recommended maximum air temperature difference between supply and room air is 12 ° C.
An external room controller varies the room airflow rate by running the Halton Jaz Conical VAV diffuser actuator with a standard 0…10 VDC control signal.
The pressure dependent function of the Halton Jaz Conical VAV operates in combination with a constant pressure duct zone.
Exhaust diffuser do not include any airflow control function, will need a separate flow control damper (like Halton HFB).
Halton Workplace WRA is part of the Halton Workplace solution offering.
Fig.1. Halton Workplace WRA room automation controller integrated to Halton Jaz Conical VAV diffuser
Halton Workplace WRA is a controller especially designed for controlling the automation system of office spaces and meeting rooms. It is used for controlling the ventilation airflow, room temperature, and indoor air quality.
The Halton Workplace WRA room automation package consists of a controller unit and optional components depending on customer needs: a wall panel and sensors for temperature, CO2, occupancy, pressure, and condensation.
There are options available for the controller unit and wall panel, depending on the number of controls and sensors required. The Halton Workplace WRA room automation controller is always combined with other Halton products for adaptable and high-level indoor climate.
The Halton Workplace WRA room automation controller operates with Variable Air Volume (VAV) dampers and active chilled beams of the Halton Workplace system. These are used for adjusting the ventilation airflow, room temperature, and indoor air quality in office spaces.
Each room unit in an office space can have its own dedicated Halton Workplace WRA room automation controller, or a single controller can control multiple room units. The Halton Workplace WRA room automation controller can automatically adjust the system according to the indoor environment level preferred by users. Each room unit having its own dedicated controller brings maximum flexibility.
Fig.15. Two Halton Jaz Conical VAV (JDS) active diffusers controlled with Halton Workplace WRA room automation controllers in a single office room
In this configuration, two Halton Workplace WRA room automation controllers (type DXR2.E12P-102A) control two Halton Jaz Conical VAV active diffusers. Each active diffuser has integrated temperature, CO2, and occupancy sensors. The pressure sensor is integrated into the Halton Workplace WRA room automation controller. The system also includes an exhaust VAV damper, and radiator heating water valve control. One Halton Workplace WRA room automation controller can individually control up to four terminal units, and there can be several Halton Workplace WRA room automation controllers in the room.
Fig.16. Schematic drawing: Halton Jaz Conical VAV active diffuser controlled with Halton Workplace WRA room automation controller
|FG||Airflow damper actuator|
|H||Water valve actuator|
For the wiring diagram of similar configuration, see the product pages of the Halton Workplace WRA room automation controller.
Note: For more information, see the product pages of the Halton Workplace WRA room automation controller.
The Halton Jaz Conical VAV active diffuser shall have a minimum safety distance of 3 x duct dimension to ensure reliable measurement and accurate control of the airflow rate.
Hang the diffuser by using the brackets located on two sides of the plenum.
Clip-in ceilings Fineline-15 ceilings
The Halton Workplace WRA controller is a room controller dedicated to complete room applications providing the demand-controlled ventilation.
The Halton Workplace WRA room controller provides a wide variety of connections for sensors and actuators and the possibility to connect a wall mounted panel with or without a display for local set points adjustment e.g. temperature, and a wireless remote control.
Control that the actuator settings are in line with the factory pre-setted DIL switches.
Control signals in junction box:
Terminal 1 Power supply 24 VAV
Terminal 2 Ground
Terminal 3 0 VDC = minimum position airflow
10 VDC = maximum position/airflow
Terminal 4 Not connected (feedback form actuator)
Make sure that the control plate of diffuser is fully open (at the lowest position). This can be done either mechanically or electrically:
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 set point to be higher or adjust the MSM adjustment unit.
The zone pressure control damper shall have a sufficient operative differential pressure over the damper (for example, 30 Pa or more).
The maximum airflow rate of the active diffuser is measured and adjusted using the MSM module.
Airflow rate is calculated using the pressure difference reading and the k factor.
qv Calculated airflow rate (l/s)
k Factor from the table
Δpm Measured pressure (Pa)
The k-factors for installation with different safety distances
(D = duct diameter).
|NS||> 8 * D||min 3 * D|
If the airflow rate of the active diffuser is too high, adjust the position of the MSM adjustment unit to closer position. If maximum airflow can’t be reached, open MSM module first full open and if this is not enough, increase the duct zone pressure
The minimum airflow for the diffuser is fixed by factory and cannot be adjusted.
For servicing open the front panel of the diffuser and detach the flow control element.
Detach the flow control plate by opening the screw (1) and remove the plate (2).
Remove the motor assembly (3) on JDS body by pushing the mounting shaft and let it hang on the wire.
The MSM is removed through diffuser outlet by pulling from it’s body – not from the measurement tubes or control spindle.
Clean the parts with a damp cloth, instead of immersing in water.
Replace all parts in opposite order. Ensure that the actuator is locked and the control plate is in right position.
The Halton Jaz Conical VAV supply air diffuser is made of painted steel with a white (RAL 9003) standard colour.
Air is introduced into the space through the adjustable control plate and the side slots of front panel, ensuring a high mixing rate. The diffuser maintains appropriate discharge velocity throughout the total airflow range.
The diffuser is integrated to a balancing plenum designed for the active diffuser installation and equipped with a measurement and adjustment module.
The diffuser has a gasket of rubber compound to ensure tight connection to the duct work.
The diffuser enables to be equipped with sensors and control system.
S = Model
D = Duct connection (mm)
125, 160, 200, 250
SP = System package
CO = Colour
SW Signal white (RAL 9003)
X Special colour
IO = Ceiling type
NA Standard T-profile
DC Clip-In ceiling
ZT = Tailored product
Y Yes (ETO)
JDS/S-200, SP=N, CO=SW, IO=NA, ZT=N