Wall/Bulkhead Electronic VAV Diffusers
Wall/Bulkhead Electronic VAV Diffusers
- Airflow can be adjusted by simply changing angle of blades within housing.
- Maintains constant air volumes from 10% to 100%.
- Very effective at distributing air across long areas.
- Multiple diffusers available.
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The Rickard electronic wall/bulkhead VAV diffusers are normally used in sidewalls or bulkheads where restricted ceiling voids exist or covered ceilings are not available. When multiple units are mounted in a row they are very effective at distributing air across long areas.
Features and Benefits
A comfortable room temperature is maintained by varying the supply air volume in accordance with demand. This is achieved by opening or closing the diffuser’s aperture, which is a set of air foil shaped aluminum vanes driven by an electric actuator. The Electronic Wall/Bulkhead VAV Diffusers are available in 100mm and 150mm heights. The 100mm size is available in lengths from 300 to 650mm and the 150mm size comes in lengths from 500 to 700mm; see range dimension diagrams for more detail. Like the linear slot diffuser, the wall/bulkhead diffuser must be connected to a wall thermostat for it to become a master diffuser.
Diffusers can be individually controlled by either a wall thermostat or the on-board master controller that sends its signal back to the BMS. The entire system is then monitored and changes can be made via a computer either on-site or remotely using the Rickard stand-alone software or a BMS. These intelligent VAV Diffusers operate on a low pressure ductwork design, making them highly energy efficient, but the pressure in the duct work must be controlled for optimal performance. For new installations duct design that achieves static regain is highly recommended. If retrofitting to existing ducting, a relief ring can be fitted to the diffuser to release air pressure when the diffusers close.
The Rickard Electronic diffuser system can be as simple as one diffuser in a single room or scaled up to work within large open areas with multiple diffusers on multi levels of a building. 60 diffusers can be accommodated on a single Rickard Master Communication Unit (MCU) and multiple MCU’s can be connected to a BMS.
Air volume control shall be achieved with the opening and closing of the diffusers aperture which varies the volume of conditioned air to enter the occupied space. The aperture shall be driven by a 12V DC electric actuator which receives a signal from a Rickard diffuser’s master controller. The system shall be supplied with Rickard MLM software that is used for commissioning, setting diffuser parameters, monitoring the network, logging diffuser activity and converting slave diffusers to master diffusers, all from below the ceiling via a computer. The system can also be controlled through the building’s BMS.
Diffusers are made from sheet steel and finished in a chip resistant epoxy powder coating. Matte white is but specific colours can be ordered to suit the architectural requirements. All internal components of nonmetallic construction are moulded in fire retardant Makrolon glass reinforced plastic.
Air volume control is achieved through the opening and closing of the air outlet mechanism within the diffuser. This mechanism is driven by an electric actuator and allows more or less air to enter the occupied space.
Power Supply Unit
The PSU is able to power up to 15 Electronic VAV Diffusers. It requires an input of 85-265 Vac and an output of 36 Vdc regulated at 1.2 Amps. Maximum operating temperature is 0°C to +50°C. The unit has an overall power consumption of 50 Watts. It features industry standard DIN rail mounting.
Methods of testing the performance of air outlets and air inlets. ANSI/ASHRAE Standard 70-2006 (RA 2011)
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