R-438A Refrigerant (HFC, R-22 Retrofit)

R-438A Refrigerant – Versatile R-22 Retrofit Solution

R-438A refrigerant, also known as MO99, is a versatile HFC blend developed as a direct retrofit for R-22 systems. It is widely used in both air conditioning and refrigeration applications thanks to its strong compatibility with mineral oil, alkylbenzene, and POE lubricants. This makes R-438A a popular choice for contractors seeking a flexible and reliable replacement option for legacy R-22 systems.

Common Applications

  • Residential and commercial A/C systems originally charged with R-22
  • Medium- and low-temperature commercial refrigeration
  • Chillers, rooftop units, and packaged systems

Cylinder Sizes & Packaging

  • 25 lb cylinder (standard service size)

Key Advantages

  • Direct retrofit option for many R-22 systems without major component changes
  • Compatible with multiple oils (mineral, AB, and POE), reducing retrofit complexity
  • Broad usage across both A/C and refrigeration equipment

Important Notes

  • Not identical to R-22: Some capacity and efficiency differences may occur after retrofit.
  • Service-only refrigerant: Designed for replacing R-22 in existing systems, not for new OEM equipment.
  • Certification: EPA Section 608 certification may be required for handling and purchase.

Looking for alternatives? Compare R-422B for residential retrofits or R-407C for A/C service replacements.

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