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TRG-TRC014-EN 31
period two
Components of a VAV System
notes
A digitally-controlled terminal unit has an airflow-modulation device
operated with an electric actuator in the same manner as the electronic control
option. The key difference between electronic control and direct digital control
is that the digital controller uses a microprocessor as the intelligence behind
the control of the terminal unit. This microprocessor enables digital
communication between the unit controller and the central building automation
system.
The result is a system that can be monitored from a central point, offers control
flexibility, and enables system-optimized control strategies. Buildings can be
controlled more intelligently because the data (such as airflow, damper
position, fan, and heat status) is available to perform complex system-control
strategies and diagnostics from a central monitoring station.
Direct Digital Control (DDC)
communicating
communicating
building automation
building automation
system (BAS)
system (BAS)
DDC/VAV
DDC/VAV
terminal units
terminal units
central air handler
central air handler
Figure 46