This is a controller for an economizer, that adjusts the mixed air dampers
to fulfill three control functions.
-
Freeze protection, based on the mixed air temperature measurement
-
Minimum outside air requirement, based on the outdoor air flow rate
measurement
-
Supply air cooling, based on the logic implemented in
Buildings.Examples.VAVReheat.BaseClasses.Controls.SupplyAirTemperature,
with the additional condition that when the outside air dry bulb is greater
than the return air dry bulb, economizer cooling is disabled.
-
August 31, 2021, by Michael Wetter:
Corrected selection of control signal during freeze protection.
-
October 27, 2020, by Antoine Gautier:
Refactored for compatibility with new supply air temperature control.
This is for
#2024.
-
July 10, 2020, by Antoine Gautier:
Added optional reset signal.
Corrected connections to yOATFre.
This is for
#2019
and
#1995.
-
December 20, 2016, by Michael Wetter:
Added type conversion for enumeration when used as an array index.
This is for
#602.
-
April 26, 2016, by Michael Wetter:
Changed controller for freeze protection as the old implementation closed
the outdoor air damper during summer.
This is
for #511.
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