Installation and modification of A/C systems for US and imported vehicles


By Ward Atkinson

Members have requested information regarding requirements that apply to vehicles produced by OEM vehicle manufacturers, commercial upfitters and independent A/C repair or service facilities that install or modify mobile A/C systems.
All A/C refrigerants listed as acceptable, including R-134a and R-1234yf, are subject to use conditions requiring labeling and the use of unique fittings. EPA is requiring the same use conditions for R-1234yf in newly manufactured medium duty passenger vehicles, HD pickup trucks and complete HD vans as it mandates in newly manufactured cars and light duty trucks.

A/C systems designed to use R-1234yf must meet the requirements of SAE J639, Safety Standards for Motor Vehicle Refrigerant Vapor Compression Systems. This document sets safety standards that include unique fittings; a warning label indicating the refrigerant’s identity and notification that it is a mildly flammable refrigerant (class A2L); and requirements for engineering design strategies that include a high-pressure compressor cutoff switch and location of pressure relief devices.

Designing the refrigerant circuit and connections to avoid refrigerant seeping into the passenger cabin ensures it is unlikely to enter the passenger cabin if there is a leak. Keeping refrigerant out of the passenger cabin minimizes the possibility there would be sufficient levels of refrigerant to reach flammable concentrations or hydrogen fluoride (HF) would be formed and transported where passengers might be exposed.
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About macsworldwide

Mobile Air Conditioning Society (MACS) Worldwide Founded in 1981, MACS is the leading non-profit trade association for the mobile air conditioning, heating and engine cooling system segment of the automotive aftermarket. Since 1991, MACS has assisted more than 600,000 technicians to comply with the 1990 U.S. EPA Clean Air Act requirements for certification in refrigerant recovery and recycling to protect the environment. The Mobile Air Conditioning Society (MACS) Worldwide’s mission is clear and focused--as the recognized global authority on mobile air conditioning and heat transfer industry issues. www.macsw.org
This entry was posted in #off road vehicles, ACtion Magazine, Uncategorized. Bookmark the permalink.

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