at addressing B2 refrigerants specifically applicable to those systems using ammonia as the refrigerant. One of the most significant modern-era changes to Standard 15 occurred in 1994 with this edition being rewritten in a "code language" (enforceable) format. Revising the standard to incorporate mandatory language was intended to enable its ease of adoption and enforcement by model both code developers and other state or local code jurisdictions. In addition to now using mandatory language, the contents of Standard 15 were organized into four major sections: General, Restrictions, Design & Construction, and Operation & Testing. This arrangement of information was intended to provide users of the standard with a means to more quickly access pertinent information. www.info.hotims.com/49810-19 Change Drives Change The next edition of ANSI/ASHRAE Standard 15 did not appear until 2001. The 2001 edition brought with it a title change to reflect its broader applicability and coverage of absorption refrigeration technology. This newest edition of Standard 15 was titled "Safety Standard for Refrigeration Systems." A number of other revisions to the standard were incorporated into the 2001 edition including changes to definitions, machinery room ventilation requirements, refrigerant safety classifications (with the addition of more new refrigerants), field test procedures, and others. One somewhat controversial change in the 2001 edition was the removal the following requirement for SCBAs that existed in prior versions of Standard 15: 11.6 Self-Contained Breathing Apparatus (SCBA). When a machinery www.info.hotims.com/49810-4 N OVEM BER 2014 ashrae.org ASHRAE JOURNAL 41