ISO 5149-1:2014/Amd 2:2021

Overview

ISO 5149-1:2014/Amd 2:2021 is an essential amendment to the International Standard ISO 5149-1, which addresses safety and environmental requirements for refrigerating systems and heat pumps. This amendment focuses on updating the definitions, classification, and selection criteria by revising Annex A and the refrigerant tables, reflecting the latest industry insights and regulatory developments as of January 2021.

Maintained by ISO Technical Committee ISO/TC 86, Subcommittee SC 1, this document ensures that refrigerating systems and heat pumps comply with rigorous safety and environmental standards, fostering the responsible use of refrigerants while supporting innovation and sustainability in HVACR technologies.

Key Topics

• Updated Definitions and Classifications: Aligns terminology with ISO 817 and IEC Electropedia, refining key terms related to refrigerants and system safety.
• Refined Selection Criteria: Clarifies capacity limits for appliances with multiple indoor units, specifying thresholds such as a 35 kW cooling or heating capacity when tested under relevant ISO methods (ISO 5151, ISO 13253, ISO 15042).
• Revised Annex A: Updates toxicity limits, room volume considerations, and classification criteria to eliminate misunderstandings related to location classifications and toxicity application.
• Comprehensive Refrigerant Tables (Annex B): Provides meticulously updated tables (B.1, B.2, B.3) that list refrigerants, including chemical formulas, safety groups, flammability, vapor density, ozone depletion potential (ODP), and global warming potential (GWP).
  • Includes details on pure refrigerants, zeotropic blends (R-400 series), and azeotropic blends.
  • Highlights newly recognized refrigerants, their practical applications, and relevant safety parameters such as lower flammability limits (LFL), auto-ignition temperatures, and Acute-Toxicity Exposure Limits (ATEL).
• Environmental Impact Data: Supplies updated ODP and GWP values based on IPCC, UNEP, and WMO assessments, assisting in selecting environmentally responsible refrigerants.
• Safety Considerations: Emphasizes toxicological and flammability data critical for risk assessment and compliance with national and international regulations.

Applications

• Refrigerating System Design: Assists engineers and designers in selecting safe, efficient refrigerants based on detailed safety classifications and environmental data.
• Heat Pump Manufacturing: Supports manufacturers in adhering to updated safety and environmental protocols while choosing refrigerants compatible with regulatory requirements.
• Regulatory Compliance: Provides national standards bodies and regulatory agencies with authoritative reference tables and definitions to guide legislation and certification.
• Risk Management: Enables facility operators and safety inspectors to evaluate refrigerant toxicity and flammability risks, ensuring safer installation and operation of refrigeration and heat pump systems.
• Sustainability Initiatives: Facilitates transition to low-GWP refrigerants, aiding industries in meeting global climate targets and Montreal Protocol obligations.

Related Standards

• ISO 817: Refrigerants - Designation and safety classification - Provides foundational definitions and safety groups referenced in ISO 5149-1.
• ISO 5151, ISO 13253, ISO 15042: Testing standards for refrigerant system capacity and performance under various conditions.
• ISO/IEC Directives, Part 1 and 2: Governance documents guiding the preparation and maintenance of ISO standards.
• Montreal Protocol: International treaty influencing refrigerant phase-out schedules aligned with environmental data in ISO 5149-1 amendments.
• UNEP, IPCC, WMO Reports: Scientific assessments incorporated for up-to-date ozone depletion and global warming potentials of refrigerants.

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