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ASHRAE Refrigeration Resources

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ANSI/ASHRAE Standard 15-2022, Safety Standard for Refrigeration Systems and ANSI/ASHRAE Standard 34-2022, Designation and Safety Classification of Refrigerants

Safety Standard for Refrigeration Systems.jpg

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.


ASHRAE Standard 15 specifies requirements for the safe design, construction, installation, and operation of refrigeration systems.

What's New in Standard 15-2022:

  • Changes to the use of non-A1 refrigerants
  • New overpressure protection
  • New piping requirements
  • Updated volume and refrigerant charge limit calculations
  • Refrigerant detector/detection and mitigation actions

ASHRAE Standard 34 establishes a uniform system for assigning reference numbers, safety classifications, and refrigerant concentration limits to refrigerants. The standard also identifies requirements to apply for designations and safety classifications for refrigerants and to determine refrigerant concentration limits. Safety classifications based on toxicity and flammability data are included along with refrigerant concentration limits for the refrigerants.

What's New in Standard 34-2022:

  • Safety designations for twenty new refrigerants
  • Modernized submission application requirements for new refrigerants
  • Updates to capture flammability limits used for non-A1 refrigerant maximum charge calculations

ANSI/ASHRAE Standard 15.2-2022, Safety Standard for Refrigeration Systems in Residential Applications (ANSI Approved)

ASHRAE Standard 15.2 is the low-rise residential refrigeration safety standard that all stakeholders can depend on.

Standard 15.2 is designed to accommodate the use of A2L-classifi ed refrigerants in low-rise residential applications and is intended for use by manufacturers, installers, contractors, service technicians, building code officials, and others.

Specific requirements are included for which refrigerants can be used, the maximum allowable refrigerant charge, accessories, and interconnecting piping, so that in the event of a full release of the refrigerant charge, the concentration in the space remains safely below the lower flammability limit of the refrigerant.


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

UNEP/ASHRAE Refrigerant Factsheet

The purpose of this fact sheet is to provide an update on ASHRAE standards for refrigerants and to introduce the new refrigerants that have been awarded an "R" number over the last few years and introduced into the international market.

pdf_icon.png Update on New Refrigerants Designations and Safety Classification (July 2024)

Translations:  pdf_icon.png Spanish 

Also Available:

McGraw-Hill- Industrial Refrigeration Handbook

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