Economizer lockout is a control setting that does what?

• A. A feature that always enables economizer
• B. A sensor that measures outdoor temperature only
• C. A valve that blocks outdoor air entirely
• D. A control setting that disables economizer operation due to humidity, IAQ concerns, or high cooling demand

Answer: (D)

Economizer lockout is a control feature that prevents the outside-air economizer from operating when conditions aren’t favorable. It disables economizer use due to humidity levels, IAQ concerns, or high cooling demand, ensuring indoor comfort and air quality aren’t sacrificed and that mechanical cooling can handle the load.

This isn’t about always turning the economizer on, nor is it simply a thermometer sensor or a damper that blocks outdoor air by itself. It’s a protective setting that decides not to use outdoor air when humidity is high, air quality would be compromised, or the cooling demand is already high.