I always thought AHRI rating conditions were 400 cfm per ton, 67 wb and 80 db entering the coil. Carrier's product data for several 4 ton combinations with variable speed fan coils list the same ratings at 1400 cfm for a 4 ton system (350 cfm/ton), or as low as 1300 cfm for the new 25VNA. What do these systems need to be set up for in order to achieve the AHRI ratings?
Similar story with Trane, for instance: https://www.comfortsite.com/Resource...s/4385456.html. 1490 cfm is what's needed to get the AHRI ratings. Presumably, if the installer set it up for 1600 cfm, you'd get more capacity and efficiency.
Do manufacturers test these combinations at particular airflows (data you'd need to get from the manufacturer) and provide the ratings to AHRI? I'm trying to understand how the process works.