From inside (document excerpt):
25HNA9 InfinitytSeries Heat Pump with Puronr Refrigerant 2 to 5 Nominal Tons (Sizes 24 To 60) Heating Check Chart 24 36 48 60 A06710 Fig. 2 25HNA924-060 2006 Carrier Corp. S 7310 W. Morris St. S Indianapolis, IN 46231 Printed in U.S.A. Edition Date: 11/06 Catalog No. 25HNA9 1HCC Replaces: New Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.