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Standards 15 & 34

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Standard 15-2016 (packaged w/ Standard 34-2016) -- Safety Standard for Refrigeration Systems and Designation and Classification of Refrigerants (ANSI Approved)

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ASHRAE’s key standards guiding refrigerant identification and usage have been revised to meet governmental regulation and achieve improved performance. Standards 15 and 34 provide essential guidance to manufacturers, design engineers and operators who need to stay current with new air conditioning and refrigerating requirements.

Standard 34 describes a shorthand way of naming refrigerants and assigns safety classifications based on toxicity and flammability data, while Standard 15 establishes procedures for operating equipment and systems when using those refrigerants. ASHRAE offers the standards as a set.



Standard 15 features updates to improve the safe design, construction, installation, and operation of refrigeration systems. It also includes updated safety relief system requirements and design pressure requirements for CO2 systems. Standard 34 now classifies 161 refrigerants and includes an updated refrigerant application process. What's New:

Standard 15-2016:

  • Incorporated changes to improve in the safe design, construction,installation, and operation of refrigeration systems.
  • Updated requirements for safety relief systems, including revisions to relief vent pipe discharge locations and design provisions for headered relief vent systems
  • Updated design pressure requirements applicable to systems using carbon dioxide;
  • Modified overpressure protection for heat exchangers and pressure limiting devices for positive displacement compressors

 Standard 34-2016:

  • Added thirty new refrigerants.
  • Changed the source of the WEEL (Workplace Environmental Exposure Levels) values from AIHA (American Industrial Hygiene Association) to TERA OARS-WEEL (Toxicology Excellence for Risk Assessment/Occupational Alliance for Risk Science).
  • Changed requirements for the refrigerant application process.
  • Changed the requirement for submission of standard test result data to validate the method used to determine burning velocity.
  • Changed units required for refrigerant designation to require the submission of dual units.
  • Revised R-744 toxicity data for the RCL, LC 50, cardiac sensitization NOEL, anesthesia NOEL, ATEL, RCL, and ATEL source

Other Refrigeration Resources

Refrigeration is critical for industrial processes, food storage, and medical applications and the cooling cycle lies at the heart of air conditioning. Expert guidance is essential.

Refrigeration Commissioning Guide 


The Essential Guide for Commissioning Refrigeration Systems

The first of its kind, Refrigeration Commissioning Guide for Commercial and Industrial Systems provides guidance to owners and managers of commercial and industrial facilities that use refrigeration systems to help ensure that project requirements are met and owners' expectations are achieved.

Learn More

Also Available:

McGraw-Hill- Industrial Refrigeration Handbook

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