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[EnergyPlus_Support] Ventilation Problem

I have the following situation.

A DOAS AHU ventilation is trying to cool a heated space. Space load cooling is taken care of by zone equipment. 

The AHU has only 2 functions.
1) prepare ODA to 18 degrees, no de-humidification is allowed.
2) keep zone CO2 levels at set point 800 ppm

Fan flow rates and coil flowrates are set to limit the amount of ventilation and cooling the AHU can bring, but as the CO2 level drops, the AHU does not drop it's ventilation rates accordingly, because it's still trying to meet the zone loads. How can I tell it to stop trying to meet the zone loads?



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