R438A is a non-ozone depleting HFC-based refrigerant designed for the replacement of R22 in refrigeration and air conditioning direct expansion systems. R438A offers a similar performance to R22.
Kirby recommends alternative refrigerants with substantially lower GWP.

PERFORMANCE
• Capacity and energy efficiency is equivalent to R22
• Use of polyolester oil is recommended (contact OEM for
more information)
• Refrigerant must be charged from the liquid phase to
ensure accurate composition
• As with any retrofit, consideration should be given to all
seals and gaskets and should be replaced at the time of
retrofit