period two

 

Components of a VAV System

notes

 

 

 

 

 

 

When in cooling mode, the supply airflow to the space equals the primary

airflow. When in tempering and heating modes, the space receives a constant

 

supply airflow equal to the minimum primary airflow plus the plenum airflow

 

delivered by the terminal fan. Usually the primary airflow is not allowed to shut

 

off completely because of the space requirement for ventilation air.

 

 

 

 

 

 

Series, Fan-Powered

 

primary air

plenum air

terminal mixing fan

supply air

Figure 30

A series, fan-poweredterminal unit consists of an airflow modulation device and a small, constant-volume fan, packaged so that their airflow paths are in series. The terminal unit fan operates continuously whenever the space is occupied. The fan draws air from either the primary air stream or the plenum, based on the thermostat in the space. This results in a constant volume of supply air delivered to the space at all times.

TRG-TRC014-EN

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Trane TRG-TRC014-EN manual Series, Fan-Powered

TRG-TRC014-EN specifications

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