ISO 5149-4:2022

Overview

ISO 5149-4:2022 - "Refrigerating systems and heat pumps - Safety and environmental requirements - Part 4: Operation, maintenance, repair and recovery" - specifies safety and environmental requirements for the operation, maintenance, repair and recovery (including reuse and disposal) of refrigerants, refrigerant oil, heat transfer fluids and refrigerating system components. It is the 2022 second edition of Part 4 of the ISO 5149 series and is intended to minimize risks to persons, property and the environment arising from improper handling, contamination or emissions of refrigerants. Motor vehicle air conditioners covered by product standards (e.g., ISO 13043) are excluded.

Key topics and technical requirements

• Operation and personnel competence
  • Requirement for clear operation instructions and adequate training of operating, supervising and maintenance personnel.
  • Advises that operators be present during key activities (evacuation, charging, commissioning).
• Documentation and logbook
  • Mandates an updated logbook recording maintenance/repair work, refrigerant quantities (new, reused, recycled), analysis results for reused refrigerants, source of reused refrigerant, component changes, periodic test results and prolonged non‑use.
  • Logbook must be readily accessible.
• Maintenance, inspection and repair
  • Preventive maintenance per manufacturer instructions and regular in‑service inspections (see Annex D).
  • Tightness checks and leak detection; repair and re‑check after leaks are found.
  • Rules for who may perform routine tasks versus specialized repairs.
• Change of refrigerant type
  • Planning and execution requirements for converting systems to different refrigerants (scope and steps summarized in Clauses 5.4.x).
• Recovery, reuse, recycling and disposal
  • Hierarchy and requirements for recovery, reuse, recycling and reclaiming refrigerants (Clauses 6.1–6.3).
  • Specific provisions for handling refrigerant oil, absorbed ammonia (R‑717) and other components.
  • Documentation, transfer, transport and storage requirements for recovered refrigerants.
• Recovery equipment
  • Performance, operation and maintenance requirements for recovery/recycling equipment (Clause 6.6). Relevant normative reference: ISO 11650.
• Informative annexes
  • Practical guidance on draining oil, recycled refrigerant specification, handling/storage, in‑service inspection and repairs involving flammable refrigerants (Annexes A–E).

Practical applications and users

ISO 5149-4:2022 is used by:

• HVACR installers, service and maintenance technicians
• Facility and plant managers of refrigeration/heat pump systems
• OEMs and equipment designers for safe servicing procedures
• Environmental/compliance officers and safety managers
• Regulators and certification bodies referencing safe refrigerant handling and documentation

Typical applications include commissioning, preventive maintenance programs, leak management, refrigerant recovery and documented end‑of‑life disposal.

Related standards

• ISO 5149-1, -2, -3 (other parts of the series: definitions, design/construction, installation site)
• ISO 11650 (performance of refrigerant recovery/recycling equipment)
• IEC 60335-2-104 (requirements for refrigerant recovery/recycling appliances)

Keywords: ISO 5149-4:2022, refrigerating systems, heat pumps, operation, maintenance, repair, recovery, refrigerant handling, refrigerant recovery, environmental requirements, safety.