ISO 817-2024 PDF

Full title and description

St ISO 817-2024 — Refrigerants — Designation and safety classification. This International Standard defines an unambiguous system for assigning designation codes to refrigerants and establishes a safety classification scheme (toxicity and flammability) together with methods to determine refrigerant concentration limits and tables of designations and safety data for use in refrigeration and air‑conditioning applications.

Abstract

ISO 817:2024 provides a numbering and designation system for refrigerants, a harmonized safety‑classification scheme based on toxicity and flammability data, procedures to determine refrigerant concentration limits (RCLs), and consolidated tables listing refrigerant designations, safety classifications and data necessary for safe use. The publication includes the maintenance/registration arrangements for updates and replacement of earlier editions.

General information

• Status: Published.
• Publication date: Edition 4, published 27 November 2024 (ISO record: 2024-11 / publication stage 2024-11-27).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 71.100.45 (Refrigerants and antifreezes).
• Edition / version: Edition 4 (2024).
• Number of pages: 34 (ISO published PDF/ePub/paper formats).

Scope

This standard specifies a clear system for assigning numerical and compositional designations to both pure and blended refrigerants and establishes a safety classification framework based on toxicity and flammability data. It provides the method for calculating refrigerant concentration limits and includes tables of refrigerant designations, safety classifications, concentration limits and other data submitted for registered refrigerants to support safe selection and use across refrigeration and air‑conditioning equipment.

Key topics and requirements

• Uniform designation system for refrigerants (numerical codes and composition prefixes).
• Safety classification scheme combining toxicity and flammability categories.
• Definition and calculation method for Refrigerant Concentration Limit (RCL) and related practical limits.
• Tabulated registry of refrigerant designations, safety classifications and RCLs based on submitted data.
• Requirements for data submission and maintenance (Maintenance Agency / Registration Authority arrangements).
• Guidance to support compatibility with related safety and equipment standards used in HVAC&R design and regulation.

Typical use and users

Used by refrigerant manufacturers, chemical registries, HVAC&R equipment designers and manufacturers, safety engineers, test laboratories, certification bodies, regulatory agencies and standards developers. It is referenced when specifying refrigerant identity on equipment documentation, assessing safe charge limits in occupied spaces, and coordinating safety classification information across product standards and regulations.

Related standards

ISO 817:2024 is maintained under ISO/TC 86/SC 8 and replaces ISO 817:2014 and its amendments (ISO 817:2014/Amd 1:2017, ISO 817:2014/Amd 2:2021). It is commonly used together with equipment and safety standards such as ISO 5149 (safety and environmental requirements for refrigerating systems) and other refrigerant property and testing standards maintained by the same technical committee.

Keywords

refrigerants, designation, refrigerant codes, safety classification, toxicity, flammability, refrigerant concentration limit, RCL, HVACR, ISO 817, ISO/TC 86/SC 8, refrigerant registry

FAQ

Q: What is this standard?

A: ISO 817:2024 is the International Standard that defines the designation system and safety classification for refrigerants (Edition 4, published November 27, 2024).

Q: What does it cover?

A: It covers the method for assigning unique designations to refrigerants, classifying them by toxicity and flammability, determining refrigerant concentration limits (RCLs), and publishing tables of designations and safety data used to support safe selection and application.

Q: Who typically uses it?

A: Refrigerant producers, HVAC&R equipment designers and manufacturers, safety and compliance engineers, testing laboratories, certification bodies and regulators use the standard to ensure consistent identification and safety handling of refrigerants.

Q: Is it current or superseded?

A: It is current. ISO 817:2024 (Edition 4) was published in November 2024 and supersedes ISO 817:2014 and its amendments. The older editions and amendments have been withdrawn.

Q: Is it part of a series?

A: ISO 817 is part of the cluster of ISO standards for refrigerants and refrigeration safety maintained by ISO/TC 86/SC 8; it is commonly referenced by equipment‑safety standards (for example ISO 5149) and other refrigerant property and testing standards.

Q: What are the key keywords?

A: Refrigerants, designation, RCL, safety classification, flammability, toxicity, refrigerant registry, HVACR, ISO 817.