JYL said what I was about to say when I was reading this thread and I'm pretty sure I said earlier. You never want to ventilate a basement because in the summer the dew point which will be much higher than every surface in your basement from the walls and mechanical equipment which will be a quick way to introduce serious mold issues and rust out your mechanical equipment. In the winter you'll dehumidify the basement ...along with the whole house if you use enough air to deal with the radon problem but that could also cause issues if the HRV manages to malfunction even slightly and have unbalanced (negative) pressure on the house causing suction on the sumps and an increase of your problem.
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