I have solved the run time error through a combination of things that I won't go into here, but I have new warning, and I am not sure how significant it is.
For 50% of the time steps I get a "Fan Mass Balance" warning.
However, the 2 fans are on open loops.
1 fan is pulling in outside air from the weather file, going through its coils, and then exhausts it.
The 2nd fan is similar, it gets temp and RH from a fictitious space (an equation), goes through a coil, and exhausts it to atmosphere.
There isn't something like the "water draw" that you could use to pull air from an infinite resource is there?
Fred
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