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TRG-TRC014-EN 77
period six
Review
notes
A simple VAV system is comprised of the following components:
n Central air handler
n Supply duct
n VAV terminal unit with thermostats and supply diffusers for each
independently controlled space
n Thermostat and unit controller for each terminal unit
n Return plenum or duct
There are various types of VAV terminal units, each one unique in its response
to changing space loads.
Review—Period Two
fan-powered VAV
terminal unit
dual-duct VAV
terminal unit
single-duct, cooling-only
VAV terminal unit
Figure 106