Another thing to consider is the number of chillers in your plant. If you have a single chiller application, you have a lot of diversity in your load profile and the weather conditions are favorable (as indicated by VSSriram) then the variable speed chiller might be appropriate. However, if...
The Trane website also has a lot of good information available. When you are in the commercial section of Trane.com, look in the Bookstore. The Air Conditioning Clinics are particularly informative.
I would strongly recommend that you update your software. While this may not fix your specific problem, there have been many significant enhancements to the program since it was first released.
According to your input, 246 cfm seems like an appropriate airflow (i.e. 500 sq ft at 0.5 cfm/sq ft)...
Robinxie:
There are a couple of questions that are typically asked when you call the Trane TRACE support center that might help you in this case.
1) What version are running? The most recent version is 4.1. If you are not running this version, I recommend that you update. Contact Trane to...