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Why economizer operation does not follow Time of Day Economizer Control Schedule

asked 2017-05-08 10:17:00 -0500

katsuya.obara's avatar

I set operation schedule specifying when air side economizer is available and set the schedule to the Field: Time of Day Economizer Control Schedule Name
However, checking at the result Air System Outdoor Air Economizer Status, air side economizer is operating even when it is specified 0(disable this feature).
I suspect that some other parameter has priority to this schedule but could not find any description in the document.
Does anyone know what is causing this situation?
Thank you.

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answered 2017-05-08 12:01:06 -0500

updated 2017-10-09 08:40:44 -0500

The time of day economizer control schedule only activates economizer mode according to the schedule. It does not disable economizer operation according to other inputs.

if ( EconomizerAirFlowScheduleValue > 0.0 ) {
    EconomizerOperationFlag = true;
    OutAirSignal = 1.0;

So the economizer should be on anytime the schedule values are > 0. If you set other inputs to not allow economizer operation (e.g., leave other limit input fields blank, for example Economizer Maximum Limit Dry-Bulb Temperature) then the schedule should work as you expect.

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Asked: 2017-05-08 10:17:00 -0500

Seen: 245 times

Last updated: Oct 09 '17