There is a custom chiller curve document written by Steve Gates that I found to be much easier to follow than the EDR guide. You can download the document and an example spreadsheet from the following site:
http://www.esimforums.com/equest/viewtopic.php?f=13&t=116&start=0&view=viewpoll
Jeremy
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Jeremy McClanathan, P.E., BEMP, HFDP, LEED(r) AP BD+C