The refrigerant R-22 is now commonly used in newer systems.

• A. Used only in automotive AC
• B. Phased out in newer systems
• C. A solvent used in cleaning
• D. Preferred for new installations

Answer: (B)

R-22 is being phased out in newer systems because of environmental regulations aimed at protecting the ozone layer. R-22 is an HCFC with ozone depletion potential, so rules under the Montreal Protocol and national environmental agencies have gradually reduced and then stopped its production for new equipment. In contrast, modern installations use refrigerants like R-410A that have no ozone depletion potential, even though they may require different equipment and handling due to higher operating pressures. So the statement that R-22 is commonly used in newer systems isn’t accurate; the trend for new equipment is to use alternatives, hence the idea that it has been phased out in newer systems.