ÂHi Jean,
I know that there is the possibility to manipulate a schedule via an EMS program, but the thing that is not very clear to me is how the Time of day economizer control schedule works. Readign the manual I intend that it simply defines when the controller is on or off, or better in abetter way, when the rule described by the Economizer min/max Limit dbt is applied.
I tryed 2 runs, with the schedule blank and a with a schedule defined. I see that even if the Outdoor air economizer status follow correctly the schedule, the supply side outlet temperature of the air loop in my opinion are not what they should be.
To be more clear i upload 2 graph for the summertime, whene the cooling is on. The first one is without the schedule implemented in the controller:outdoorair and I obtain a "right" result for the supply side outlet temperature fpr the air loop. The second graph is the result with the schedule implemented. The bypass is active so the supply side outlet should be at the same temperature of the outdoor air, but I obtain a supply side outlet temperature greater that the outdoor dbt. I can't understand why. The fans heat loss is not the cause of the difference.Â
I'm very interested in you opinion,
Thanks.
Marco
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Posted by: Jean Marais <jeannieboef@xxxxxxxxx>
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