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

Dear all,
Regarding this 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.'

Please, can anyone explain how this HVACTemplate:System:VAV works? I feel lost in questions, like:
Should heating and cooling coils run independently of each others and only depend on thermal zones thermostats? Then, what if two thermostats provided contradicting signals: a request for heating and another for cooling?
And in case there are no contradicting signals, why there is a possibility both coils are running together when heating coil setpoint is higher than cooling coil setpoint? Is there some 'invisible' thermostat E+ object between these two coils?

Maybe my questions are too basic, but I really need help here.

Thank you very much.

Hisham

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "hisham.rashrash" <hisham.rashrash@...> wrote:
>
> Dear all,
> 
> I got this warning:
> 
> Program Version,EnergyPlus-Windows-64 8.1.0.008, YMD=2013.12.17 17:18,IDD_Version 8.1.0.008
>    ** 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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