Savings result from the elimination of variable speed drives for the air handling system fan(s). At reduced zone loads, cool primary air is returned to the air handler via the plenum or return air duct without experiencing zone heat gains. The lower return air temperature allows the air handler to operate more eficiently.
The AV-100 Series unit comes standard in several different configurations.
System Principle of Operation
A variable Air Volume, by-pass system consists of VAV units connected to the supply air duct of a constant air volume source. A constant volume of conditioned air is supplied to each VAV unit. The primary damper modulates in response to a zone thermostat demand, to vary the amount of conditions air delivered to the occupied zone.
Damper operation On / Off or Modulating will range from full shut-off to full open by supplying variable air volume, or to a minimum air volume to the conditioned zone. As the primary damper modulates in response to room thermostat, demand and once it is satisfied to reduce the air volume to the occupied zone, the excess air is diverted through the by-pass secondary damper into the ceiling plenum for free or ducted return.
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