Halton Jaz JMC – Nozzle diffuser

Overview

Halton Jaz JMC is a square diffuser with a circular nozzle area that supplies air in a swirl pattern. The adjustable nozzle pattern makes the diffuser flexible for various use cases and the throw pattern easy to adjust.

Application area

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

Key features

• Swirl function with adjustable nozzles
• Silent function also with large airflows
• Adjusting and measuring with balancing plenum Halton Pop PDI

Operating princple

Fig. 1. Operating principle of Halton Jaz JMC

Air is supplied into the space through nozzles of the front panel. 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 desired direction. By default, each nozzle is oriented tangentially to the circular shape, which leads to swirl function of the throw pattern. Custom patterns are also possible thanks to the individually adjustable nozzles. Direction of the supply air jet has no effect on the noise level, pressure drop or airflow rate.

The recommended maximum temperature difference between 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 JMC diffuser

Halton Jaz JMC with Halton Pop PDI plenum

Fig. 5. Dimensions of Halton Jaz JMC with Halton Pop PDI plenum, externally positioned connection spigot

Fig. 6. Dimensions of Halton Jaz JMC with Halton Pop PDI plenum, internally positioned connection spigot

Specification

Square nozzle diffuser with circular pattern 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.
• Round nozzle pattern with swirl air distribution.
• Individually adjustable nozzles to change air distribution upon need.
• Two-slot nozzle design to ensure efficient air mixing and silent operation.
• Unit width 595 mm, height 70 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 fixed gasket.

Model with balancing plenum

• Diffuser to be connected with a galvanised steel plenum Halton Pop PDI.
• Plenum has 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 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 JMC diffuser connected to a Halton Pop PDI plenum

The diffuser is available in size 595×595 mm for direct installation to the modular T-bar ceiling (600×600) either above or below the list.

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).

Commissioning

Fig. 8. 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. 8). 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 (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 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. Wipe also 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

JMC/D-A, CO-ZT

Order code example

JMC-200-600; CO=SW, ZT=N