OTHER ALTERNATIVES TO CFC As blends make their way into the retrofit market, you will need to understand how blends function. Some of the blends are ternary, which means they area three part blend. Most ternary blends are used with an alkyl benzene lubricant. Blended refrigerants will leak from a system in uneven amounts due to different vapor pressures. Due to these varying vapor pressures, charging in the liquid phase is required. NOTE: If a blend contains HCFC‐22 all hoses must be replaced with barrier type hoses. EPA's SNAP program evaluates these substitutes to assess their effect on human health and the environment. Page 11 of this manual contains a partial list of alternative refrigerants and their status as of June 3, 1997. 9
