Feature

LED indicators – the alarm unit has three LED indicators :-

Red – Alarm

Amber – Caution

Green – Safe

Digital Display

Emergency – will be displayed when the Emergency input is activated ( when enabled) This display will be alternate on/off with the velocity reading.

Air Fail – will be displayed if the airflow is less than the Low air alarm point. This display will alternate on/off with the velocity reading.

High Air - will be displayed if the airflow is less than the High air alarm point. This display will alternate on/off with the velocity reading.

Fan ON / OFF – will be displayed if the Fan button is operated (when enabled)

Lights ON / OFF – will be displayed if the Light button is operated (when enabled)

Purge ON / OFF – will be displayed Purge button is operated (when enabled)

Advantages of VAV System

It monitors and controls pressurization in laboratories for increased safety, it readily adapts to adding or moving fume hoods around during remodeling, and it improves fume hood safety monitoring. The advantages of the VAV system make up for the fact that the system may not have the lowest first cost.

Able to meet the comfort requirements of different zones in a building without heating and cooling at the same time.

The fan capacity control, especially with modern electronic variable-speed drives, reduces the energy consumed by fans, which can be a substantial part of the total cooling energy requirements of a building. Dehumidification is greater with VAV systems than it is with constant-volume system, which modulate the discharge air temperature to attain part load cooling capacity.