This standard applies to Positive Displacement Ammonia Compressors (Ammonia Compressors) and Compressor Units (Ammonia Compressor Units) for use in commercial and industrial refrigeration applications.

Refrigerant. This standard applies to compressors and compressor units using ammonia (R717), as defined in ANSI/ASHRAE Standard 34 with Addenda.

Purpose. The purpose of this standard is to establish for Positive Displacement Ammonia Compressors and Compressor Units: definitions; test requirements; rating requirements; minimum data requirements for Published Ratings; marking and nameplate data and conformance conditions.

Intent. 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.