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[EnergyPlus_Support] calculation of indoor humidity

I have a question about the indoor humidity. I try to evaluate the 
the performance of an energy recovery ventilator (I use air-to-air 
exchanger model in EnergyPlus). My base case is a single-zone 
building with a constant air volume system. The alternative case is 
the same building, same HVAC system, but I add the ERV on top of it. 
When I look at the resulting indoor conditions, I find that the 
indoor RH for the base case is about 40-50% most of the time, which I 
think is reasonable. But the indoor RH for the alternative case is 
very low, always below 40%, even when the ERV is not running 
(accordint to its available schedule). I am surprised about the 
results. Can anyone help me with it? 

I have uploaded two files to the "Files" area, one named as CAV.idf 
and another named as ERV.idf. I run the simulation for Pittsburgh. I 
got warning messages about the psychrometric chart. I am not sure if 
it is the reason for the problem.


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