Halton Jaz JSC – Nozzle diffuser

Overview

Halton Jaz JSC is the perfect choice for several different applications ranging from workplaces to hospitals, thanks to its high mixing effect. This square diffuser is available with three different front plate models, each with a different amount of nozzles and designed for specific airflow requirements.

Application area

• Ventilation in offices, hospital rooms, schools, and public spaces

Key features

• Adjustable nozzles
• Silent function also with large airflows
• Adjusting and measuring with Halton Pop PDI balancing plenum
• Ceiling adapters available for different ceiling types

Operating principle

Fig. 1. Operating principle of Halton Jaz JSC

Air is supplied into the space through the nozzles of the front panel. The two-channel design of the nozzles allows silent operation and high induction rate.

The throw pattern of the diffuser can be adjusted by turning nozzles to the desired direction. By default, the nozzle pattern is 4-directional. Other often used patterns are 3-, 2-, 1 ways, but the custom patterns are also possible thanks to the individually adjustable nozzles. The direction of the supply air jet has no effect on the noise level, pressure drop or airflow rate.

The recommended maximum temperature difference between the supply and room air is 10 °C.

Key technical data

Features and options

* Orderd separately

Quick selection

Values with adjustment module (MSM) fully open.

Fig. 2. Quick selection with unit l/s

Fig. 3. Quick selection with unit m³/h

Structure and materials

Dimensions and weight

Fig. 4. Dimensions of Halton Jaz JSC diffuser, 600×600 mm (left) and 420×420 mm (right)

Halton Jaz JSC with Halton Pop PDI plenum

Fig. 5. Halton Jaz JSC with Halton Pop PDI plenum, externally positioned connection spigot

Fig. 6. Halton Jaz JSC with Halton Pop PDI plenum, internally positioned connection spigot

Specification

Square nozzle diffuser for false ceiling installation, fulfilling the following requirements:

Structure

• Front panel openable and removable to allow general maintenance and cleaning.
• Front panel removable without special tools.
• Four directional air distribution.
• Individually adjustable nozzles to change air distribution upon need.
• Two-slot nozzle design to ensure efficient air mixing and silent operation.
• Unit sizes:
  • 595×595 mm, height 70 mm
  • 420×420 mm, height 50 mm
• Inlet duct diameter 125, 160, 200, 250 or 315 mm.

Materials

• Casing and front panel manufactured from steel.
• Casing and front panel white, powder painted in RAL 9003, 30 % gloss.
• Connection spigot manufactured from galvanized steel.
• Connection spigot equipped with a fixed gasket.

Model with balancing plenum

• Diffuser to be connected with a galvanised steel plenum Halton Pop PDI.
• Plenum has an integrated gasket to ensure airtight duct connection.
• Plenum has a removable adjustment module MSM for supply or MEM for exhaust.

Packaging and identification

• The product is protected by a removable plastic coating.
• The product is packed in a cardboard box.
• The product is identified by labels attached both to the product and the cardboard box.

Installation

Fig. 7. Halton Jaz JSC connected to a Halton Pop PDI plenum

The diffuser is connected usually to balancing plenum Halton Pop PDI (Fig. 7.). Alternatively, it can be connected direct to the duct by riveting or screwing. In that case, minimum safety distance to the next T-branch or curve is three times the duct diameter (3xD).

Fig. 8. Halton Jaz JSC, 420 with 595×595 mm ceiling adapter (CA) 

Commissioning

Fig. 9. Adjustment of airflow of diffuser and plenum combination

Airflow control

The diffuser itself has no airflow adjustment. To adjust and measure the supply airflow rate, the diffuser shall be combined with Halton Pop PDI balancing plenum with measurement and adjustment module MSM. In case of exhaust air, use of adjustment module MEM is recommended. It is not possible to measure exhaust airflow rate with adjustment module MEM.

Open the front plate and pass the tubes and control spindle through the front panel (Fig. 9.). Replace the front panel. 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 airflow rate (pressure difference) is achieved.

Set the tubes and spindle back into the plenum. Damper position can be locked with a knurled head screw of the adjuster.

Maintenance

Detach the front panel of the diffuser and let it balance on the hinges. If needed, each nozzle can be easily removed by pressing the stoppers and then pushing the nozzle through the front panel.

Wipe the diffuser casing, nozzles and front panel with a damp cloth.

The nozzles are replaced into the front panel by pushing. After cleaning, reattach the front panel.

Option with balancing plenum

Remove the measurement and adjustment module by gently pulling from the shaft; not from the control spindle or measurement tubes.

Wipe the components with damp cloth instead of immersing in water. Also wipe the inner part of the plenum; detach the attenuation material, if needed.

Reassemble the module by pushing the shaft until the unit meets the stopper.

After cleaning, reattach the front panel.

Order code

JSC-D-A; CO-ZT

Order code example

JSC-125-420; CO=SW, ZT=N