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12 TRG-TRC014-EN
notes
Next, we will examine the individual components that compose a VAV system.
A simple VAV system includes the following:
n Central air handler with a variable-volume supply fan, a cooling coil,
possibly a heating coil, controls, filters, a mixing box, and a return or relief
fan
n Supply duct
n VAV terminal unit, or “box,” with a thermostat and supply diffusers for each
independently controlled space
n Thermostat and unit controller for each terminal unit
n Return plenum or duct
The VAV terminal units modulate the airflow supplied to each space.
VAV Systems
period two
Components of a VAV System
Figure 19
supply
supply
ductwork
ductwork
VAV
VAV
box
box
thermostat
thermostat
return air path
return air path
Components of a VAV System
central
central
air handler
air handler
supply
supply
fan
fan
relief
relief
fan
fan
Figure 20
period two
Components of a VAV System