ISO 5149-3:2026

Refrigerating systems and heat pumps — Safety and environmental requirements — Part 3: Installation site, classification and selection criteria ISO 5149-3:2026

Publication date:   Nov 5, 2026

Scope

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 ISO 5149-2 and ISO 5149-4.
This document is applicable to:

refrigerating systems, stationary or mobile, of all sizes, except vehicle air conditioning systems covered by a specific product standard, e.g. ISO 13043 and SAE J 639;
secondary cooling or heating systems;
the location of the refrigerating systems;
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 ISO 817.