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[EnergyPlus_Support] Supply fan and Return Fan Air Flow Rate

Dear All,
   
  I experienced a problem when I modelled supply constant volume fan and return fan in the same air system. The air system uses 100% outdoor air flow with heat recovery. The supply fan air flow rate is 0.62m3/s. When I did not add the return fan, the system node check shows the system air flow rate is 0.62m3/s.  To represnt the real situation, a return fan was added to the air system with the fan air flow rate of 0.56m3/s (90% of supply flow rate so that room has 10% positive pressure).  However, I found that the system supply air flow rate was also reduced to 0.56m3/s.  When I change the return fan airflow rate, the system supply air flow rate always keeps the same as the return fan airflow rate.
   
  In my air system, the component configuration sequencey is "return fan-cooling coil-heating coil-supply fan".  The heat recovery unit is also in the air system but not listed in the air system branch.  Could somebody help me out of this problem?  I have no ideal what is wrong with the configuration. I cannot find an example that includes both return fan and heat recovery unit in the air system.
   
  Thanks a lot for your help in advance.
   
  Regards,
   
  Zhen
   

 
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