.Buildings.Examples.VAVReheat.BaseClasses.Controls.Economizer

Information

This is a controller for an economizer, that adjusts the mixed air dampers to fulfill three control functions.

1. Freeze protection, based on the mixed air temperature measurement
2. Minimum outside air requirement, based on the outdoor air flow rate measurement
3. 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.

Revisions

• 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.