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ASHRAE Publishes Refrigerant Safety Standard
Revisions to Standard 34 from the American Society of Heating, Refrigeration and Air Conditioning Engieers (ASHRAE) should make it easier for manufacturers to prepare applications for refrigerant number assignment and safety classification.
ANSI/ASHRAE Standard 34-2007, Designation and Safety Classification of Refrigerants, establishes a simple means of referring to common refrigerants in place of chemical names, formulas or trade names. It also establishes safety classifications based on toxicity and flammability data. The 2007 standard contains a total of 16 new refrigerants.
The new standard contains revisions to the flammability classification and details on the flammability and fractionation testing procedures. These revisions should make it easier for manufacturers to prepare applications for refrigerant number assignment and safety classification.
Also, new section has been added specifying the criteria to determine recommended refrigerant concentration limits (RCL) in occupied spaces. The addition of RCL values will be useful in application of the refrigerants in the field.
For more information, visit www.ashrae.org.