This standard applies to factory-made residential, commercial and
industrial water-source heat pumps, as defined in Section 3.

     Energy Source.  This standard applies only to electrically-driven,
     mechanical compression type systems.

     Alternate Applications.  Equipment designed for rating under this
     standard may not be suitable for alternative applications covered
     in related ARI Standards 325 and 330.

Exclusions.  This standard does not apply to individual assemblies for
separate use.

Purpose. The purpose of this standard is to establish for
water-source heat pumps:  definitions and classifications; requirements
for testing and rating; performance requirements; marking and nameplate
data; and conformance conditions.

     This standard is intended for the guidance of the industry,
     including manufacturers, engineers, installers, contractors and
     users.

     Review and Amendment.  This standard is subject to review and
     amendment as technology advances.