BronYrAur,
One more thing. I noticed in a prior remark, you wondered about the low temp chiller. This is in order to dehumidify to the level required for the lower temperatures that these rooms usually are operated at. (Mid 60s F) Dessicant is another method, especially if you have a heat...
BronYrAur,
Not sure whether you are still working on the O/R issue, but thought I would chime in.
I'll give you the the design requirements for California, which are slightly more stringent than other states.
If recirc is used, total ACH = 20, 5 of which is OSA.
If 100% OSA, ACH = 12.
Temp...