National foreword

This British Standard is the UK implementation of ISO 5149‑1:2026. It supersedes BS ISO 5149‑1:2014+A2:2021, which is withdrawn.

The UK participation in its preparation was entrusted to Technical Committee RHE/18, Refrigeration safety.

A list of organizations represented on this committee can be obtained on request to its committee manager.

Contractual and legal considerations

This publication has been prepared in good faith, however no representation, warranty, assurance or undertaking (express or implied) is or will be made, and no responsibility or liability is or will be accepted by BSI in relation to the adequacy, accuracy, completeness or reasonableness of this publication. All and any such responsibility and liability is expressly disclaimed to the full extent permitted by the law.

This publication is provided as is, and is to be used at the recipient’s own risk.

The recipient is advised to consider seeking professional guidance with respect to its use of this publication.

This publication is not intended to constitute a contract. Users are responsible for its correct application.

Compliance with a British Standard cannot confer immunity from legal obligations.

This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 November 2026.

Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types of ISO document should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).

ISO draws attention to the possibility that the implementation of this document may involve the use of (a) patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a) patent(s) which may be required to implement this document. However, implementers are cautioned that this may not represent the latest information, which may be obtained from the patent database available at www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.

Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement.

For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISO's adherence to the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.

This document was prepared by Technical Committee ISO/TC 86, Refrigeration and air-conditioning, Subcommittee SC 1, Safety and environmental requirements for refrigerating systems.

This second edition cancels and replaces the first edition (ISO 5149‑1:2014), which has been technically revised. It also incorporates the Amendments ISO 5149‑1:2014/Amd 1:2015 and ISO 5149‑1:2014/Amd 2:2021.

The main changes are as follows:

the entire technical content has been moved to ISO 5149‑3, keeping only the vocabulary in this document.

A list of all parts in the ISO 5149 series can be found on the ISO website.

Any feedback or questions on this document should be directed to the user’s national standards body. A complete listing of these bodies can be found at www.iso.org/members.html.

Introduction

This document defines terms for the ISO 5149 series, the purpose of which is to specify requirements for the safety of persons and property involved with refrigerating systems, heat pumps and the recovery of refrigerants. The ISO 5149 series also provides guidance for the protection of the environment. The series establishes procedures for the following items as regards refrigerating systems, heat pumps and the recovery of refrigerants:

design;
construction;
testing;
marking and documentation;
installation;
operation;
maintenance;
repair;
refrigerating system disposal.

The ISO 5149 series 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 if they are not identical in function and capacity.

1 Scope

This document defines terms used in the specification, design, manufacture, construction, installation, commissioning, maintenance and decommissioning of refrigerating systems with regard to safety and environmental requirements.

The term "refrigerating systems" includes heat pumps and air conditioners.

2 Normative references

3 Terms, definitions and abbreviated terms

3.1 Terms and definitions

3.2 Abbreviated terms

Bibliography