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[EnergyPlus_Support] heat exchanger:Air to air: general

I have a heat exchanger:air to air:general in a model that only transfers sensible heat between the relief airflow and the outdoor air flow.  Running it in the summer design day, I have discovered that no matter what control strategy for the out door air system, there are hours where the "Heat Exchanger Sensible Heating Rate" is positive.  I have looked at the  HVACStandAloneERV_Economizer.idf example for help,  and it has the same issue.   I have also looked at DesiccantCVRh.idf and in this file the sensible heating rate is zero for the summer,  but if I remove the desiccant unit from the loop you have the same issue.  
Is there a control strategy that can be used along with an outdoor air controller (with economizer) to eliminate this? 
Thank you,
Joe Lewis

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