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The standard also identifies requirements to apply for designations and safety classifications for refrigerants and to determine refrigerant concentration limits. Refrigerant detector/detection and mitigation actionsĪSHRAE Standard 34 establishes a uniform system for assigning reference numbers, safety classifications, and refrigerant concentration limits to refrigerants.

Updated volume and refrigerant charge limit calculations.

Changes to the use of non-A1 refrigerants.

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

ANSI/ASHRAE Standard 15-2022, Safety Standard for Refrigeration Systems and ANSI/ASHRAE Standard 34-2022, Designation and Safety Classification of RefrigerantsĪSHRAE’s key standards guiding refrigerant identification and usage have been revised to meet governmental regulation and achieve improved performance.