Carrier Owners Manual - Enlarge page 1 of 2
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From inside (document excerpt):
25HPA4 PerformancetSeries Heat Pump with Puronr Refrigerant 1 1/2 to 5 Nominal Tons (Sizes 18 To 60) Heating Check Chart A06708 Fig. 2 25HPA4018-060 2006 Carrier Corp. S 7310 W. Morris St. S Indianapolis, IN 46231 Printed in U.S.A. Edition Date: 11/06 Catalog No. 25HPA4 1HCC Replaces: New Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.