Question-and-Answer Resource for the Building Energy Modeling Community
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There is a really good conversation about this topic I recommend here: https://unmethours.com/question/22504/part-load-performance-for-ashrae-901/
Several approaches are outlined in the conversation linked above each with their own merits.
Unfortunately the full load kW/ton and IPLV requirements do not correspond to a realistic piece of equipment on the market but is rather intended to be a set of maximum limits inclusive of multiple manufacturers. I suspect this is intentional as it would not necessarily be a fair for the ASHRAE 90.1 committee to designate a particular manufacturer's equipment as the "code minimum" and of course various competing manufacturers provide input to the committee and the standard.
