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[EnergyPlus_Support] Heating Coil and Cooling Coil are running simultaneously!?!?

Dear all,

I got this warning:

Program Version,EnergyPlus-Windows-64, YMD=2013.12.17 17:18,IDD_Version
   ** Warning ** Output:PreprocessorMessage="ExpandObjects" has the following Warning conditions:
   **   ~~~   ** Warning:  In HVACTemplate:System:VAV "VAV" the Heating Coil Design Setpoint
   **   ~~~   ** is greater than the Cooling Coil Design Setpoint. This may cause the
   **   ~~~   ** heating coil and cooling coil to operate simultaneously. Check results
   **   ~~~   ** carefully and adjust controls if needed.

It seems like EnergyPlus puts a thermostat between coils? why should they run at the same time?

Please advise.


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