ISO 5149-3:2026

This document specifies:

• the classification and selection criteria applicable to refrigerating systems;
• safety requirements for the installation site of refrigerating systems and their ancillary components.

These classification and selection criteria are used in ISO5149-2 and ISO5149-4.

This document is applicable to:

1. refrigerating systems, stationary or mobile, of all sizes, except vehicle air conditioning systems covered by a specific product standard, e.g. ISO13043 and SAEJ639;
2. secondary cooling or heating systems;
3. the location of the refrigerating systems;
4. parts replaced and components added after publication of this document if they are not identical in function and in capacity.

This document is applicable:

• to new refrigerating systems, extensions or modifications of already existing systems;
• for used systems, being transferred to and operated on another site;
• in the case of the conversion of a system for another refrigerant.

This document is only applicable to systems containing refrigerants which have a safety group classification and are listed in ISO817.