Halton Jaz JRC – Perforated diffuser

Overview

Halton Jaz JRC is a perforated diffuser with the combination of excellent indoor climate conditions and iconic design. It is available for both supply and exhaust installation, which enables a unified ceiling design.

Application area

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

Key features

• Perforated
• Suitable for air supply and exhaust
• Silent function also with large airflows
• Adjusting and measuring with balancing plenum Halton Pop PDI
• Ceiling adapters available for different ceiling types

Operating principle

Fig.1. Operating principle od Halton Jaz JRC, supply

Air is supplied into the space through the perforated front panel of the diffuser. There is a deflector disc in the middle of the front panel, which turns the air vertically parallel to the ceiling, so that Coanda-effect would work.

The supply air pattern is 4-directional. However, the pattern can be directed to 3, 2 or 1 ways by using with separate deflector parts (DP, delivered as accessory, see section Installation).

The recommended maximum temperature difference between supply and room air as follows:

• 8 °C for 4- and 3 –way air supply direction
• 6 °C for 2- and 1–way air supply direction

Diffuser can also be used as an exhaust unit by removing the deflector disc from the middle of the front panel (Fig. 2).

Fig.2. Operating principle od Halton Jaz JRC, exhaust

Key technical data

Features and options

* Ordered separately

Quick selection

Values with adjustment module (MSM) fully open.

Fig. 3. Quick selection with unit l/s  

Fig. 4. Quick selection with unit m³/h

Structure and materials

Dimensions and weight

Fig. 5. Dimensions of Halton Jaz JRC diffuser, 600×600 mm (left) and 420×420 mm (right)

Halton Jaz JRC with Halton Pop PDI plenum

Fig. 6. Halton Jaz JRC with Halton Pop PDI plenum, externally positioned connection spigot

Fig. 7. Halton Jaz JRC with Halton Pop PDI plenum, internally positioned connection spigot

Specification

Square perforated diffuser for supply or exhaust air 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.
• Adjustable air throw pattern with separate deflection panel set (DP)
• Unit sizes:
  o 595×595 mm, height 70 mm
  o 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 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. 8. Halton Jaz JRC 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 usually connected to the balancing plenum Halton Pop PDI (see Fig. 6). Alternatively, it can be connected directly 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’s diameter (3xØD).

Adaptations for different ceiling types can be made with size 420×420 mm and a separate ceiling adapter (CA,
to be ordered as an accessory, see Fig. 9). See the section Download for more information about the ceiling
adapters.

Fig. 9. Halton Jaz JRC, 420 with 595×595 mm ceiling adapter (CA)

Throw pattern can be adjusted by using separate deflection panel package DP. In Fig. 10., the possible directions are shown.

Fig. 10. Deflection part options

Code description
R4        Radial jet, 4 direction
R3        Radial jet, 3 direction
R2        Radial jet, 2 direction
R1        Radial jet, 1 direction
E          Exhaust

Commissioning

Fig. 11. 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. 11.). 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.

Wipe the diffuser casing and front panel with damp cloth. Ensure that the deflector panels are directed as requested. 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

JRC-D-A, CO-ZT

Order code example

JRC-125-420, CO=SW, ZT=N