HVAC Breaking News

Oct. 22, 2010: ASHRAE Publishes 2010 Editions of Refrigerant Safety Standards

October 22, 2010
/ Print / Reprints /
/ Text Size+

ATLANTA - The American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) announced that the 2010 editions of its refrigerant safety standards have been published as a package with 14 new refrigerant blends added.

Requirements in ANSI/ASHRAE Standard 34-2010, Designation and Safety Classification of Refrigerants, and ANSI/ASHRAE Standard 15-2010, Safety Standard for Refrigeration System, complement each other in that 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 sells the standards as a set.

Standard 34-2010 combines the 2007 standard and 37 published addenda. Among the key changes incorporated into the 2010 edition are:

• Assignment of designations and safety classifications for one new single compound refrigerant and 14 new refrigerant blends.

• Addition of occupational exposure limits for refrigerants to Tables 1 and 2.

• Addition of new data and updates of refrigerant concentration limits (RCL) and safety classifications for several existing refrigerants.

• Addition of an optional 2L subclass to the existing Class 2 flammability classification, which signifies Class 2 refrigerants with a burning velocity less than or equal to 10 cm/s.

• Introduction of a modified method of calculating the heat of combustion for refrigerants along with inclusion of an illustrative example of the calculation.

• Addition of an informative appendix showing an example of the calculation of the acute toxicity exposure limit and refrigerant concentration limit for a refrigerant blend.

Changes to Standard 15 include incorporation of nine new addenda. The changes made through these addenda include:

• Revision of requirements for terminating relief vent discharge lines.

• Revision to bring the standard into alignment with UL 984 (Hermetic Refrigerant-Motor Compressors).

• Addition of definitions so the standard can better provide for the safety of cascade refrigeration systems.

• Revision to provide appropriate guidance for the protection of positive displacement compressors when used in cascade refrigeration system configurations.

• Revision to bring the standard into alignment with Standard 34, by removing Table 1 for “refrigerant quantity limits,” and uniformly using the term “refrigerant concentration limits.”

Standard 15-2010 and Standard 34-2010 are sold together. The cost is $89 ($75 ASHRAE members). To order, contact ASHRAE Customer Service at 800-527-4723 (United States and Canada) or 404-636-8400 (worldwide), fax 404-321-5478, or visit www.ashrae.org/bookstore.

Publication date: 10/18/2010

Did you enjoy this article? Click here to subscribe to The NEWS Magazine

You must login or register in order to post a comment.



Image Galleries

2014 Energy Efficiency Forum

Highlights from the 25th annual Energy Efficiency Forum in Washington, D.C.


NEWSMakers: Jeremy Begley

Jeremy Begley, home-performance specialist and Web and social media manager with National Heating and Air Conditioning Co. in Cincinnati discusses how and why you should add home-performance philosophies to your contracting repertoire. Posted on Sept. 12.

More Podcasts


NEWS 09-15-14 cover

2014 September 15

Check out the weekly edition of The NEWS today!

Table Of Contents Subscribe

Venting R-22

The NEWS reported that a man received prison time for venting R-22. Should EPA step up enforcement?
View Results Poll Archive


2014 National Plumbing & HVAC Estimator

Every plumbing and HVAC estimator can use the cost estimates in this practical manual!

More Products

Clear Seas Research


Clear Seas ResearchWith access to over one million professionals and more than 60 industry-specific publications, Clear Seas Research offers relevant insights from those who know your industry best. Let us customize a market research solution that exceeds your marketing goals.


Magazine image
Register today for complete access to ACHRNews.com. Get full access to the latest features, Extra Edition, and more.


facebook icontwitter iconyoutube iconLinkedIn i con