CONTROL STRATEGIES FOR HVAC SYSTEMS
CONTROL STRATEGIES FOR HVAC SYSTEMS
CONTROL STRATEGIES FOR HVAC SYSTEMS
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Control Strategies For <strong>HVAC</strong> Systems<br />
Exhaust Air<br />
Dampers<br />
NC<br />
T<br />
H<br />
EA<br />
Return Air<br />
Dampers<br />
NC<br />
CHWR<br />
NC<br />
Chilled Water<br />
Valve<br />
NC<br />
CHWS<br />
NO<br />
NO<br />
Hot Water<br />
Valve<br />
HWR<br />
RE<br />
OA<br />
T<br />
Outside Air<br />
Dampers<br />
NC<br />
Filter<br />
T<br />
HWS<br />
3 o C<br />
LL<br />
T<br />
SA<br />
DI<br />
Analog Inputs<br />
DDC Panel<br />
Controller<br />
Algorithm<br />
Logic<br />
Code<br />
Schedules<br />
DO<br />
Analog Outputs<br />
High Limit Humidity Control Strategy<br />
5<br />
Control Strategies For <strong>HVAC</strong> Systems<br />
DDC<br />
DI<br />
Analog Inputs<br />
DDC Panel<br />
Controller<br />
Algorithm<br />
Logic<br />
Code<br />
Schedules<br />
DO<br />
Analog Outputs<br />
Direct Digital Control or Distributed Digital Control<br />
Terms Direct and Distributed differences between<br />
these control systems and analogue electronic or<br />
pneumatic control systems.<br />
Term Distributed underscores ability to increase<br />
system reliability, speed, computing power by dividing<br />
the control functions of a facility among a number of<br />
smaller microprocessor based panels. Each of these<br />
panels can operate alone or as a part of larger system.<br />
6<br />
3
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