period two

Components of a VAV System

notes

minimum setting of the unit for the cooling mode. When warm, buoyant air is

 

During the heating mode, the primary airflow must often be greater than the

 

supplied from the ceiling, a certain velocity is required to effectively deliver

 

it down to the occupied portion of the space. Increased airflow may also be

 

needed to meet the minimum requirement for proper operation of the

 

heating coil.

 

VAV reheat is more efficient than the constant-volume reheat system discussed

 

earlier because heat is provided at reduced airflow and only when required.

Fan-Powered Terminal Units

warm

parallel

plenum air

 

cool primary air

series

Figure 27

Another method that a single-duct VAV terminal unit can employ to heat a space is to mix warm plenum air with cool primary air. Because this method uses a small fan to draw warm air from the plenum and mix it with the primary air, they are called fan-poweredterminal units.

They come in two configurations, parallel and series.

TRG-TRC014-EN

17

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Image 22
Trane TRG-TRC014-EN manual Fan-Powered Terminal Units, Series

TRG-TRC014-EN specifications

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