Variable air volume active supply diffuser for Halton Vario system. 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|
| Measurement and
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 air flow 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).
The Halton Jaz Integrated 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 Vario Jaz controller is a room controller dedicated to complete room applications providing the demand controlled ventilation.
The Halton Vario Jaz 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.
See documents from the Documents-section for more information.
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
125, 160, 200, 250
CO = Colour
SW White (RAL 9003, standard)
X Special colour
IO = Ceiling type installation options
NA Standard T-profile
DC Clip-In ceiling
RC = Room controller
NA Not assigned
LA1 LON, HVL-527 for single unit
LA2 LON, HVL-527 for up to 6 units
LA3 LON, without room controller
BA1 BACnet, HVB-527 for single unit
BA2 BACnet, HVB-527 for up to 6 units
BA3 BACnet, without room controller
All room controller models include unit integrated temperature sensor.
SE = Sensors
NA Not assigned
SA1 Occupancy (only with LA- and BA- series)
SA2 Occupancy and CO2 (only with LA- and BA- series)
SA3 CO2 (only with LA- and BA- series)
ED = Exhaust air diffuser control
CP = Control panel
NA Not assigned
PA2 With setpoint shift and display (BACnet and LON only)
PA3 Remote control unit (BACnet and LON only)
ZT = Tailored product
Y Yes (ETO)
JDS/S-200, CO=SW, IO=NA, RC=LA1, SE=SA3, ED=N, CP=PA2, ZT=N