TDX 20 refrigerant is a multi-functional refrigerant that can replace R22 in the direct expansion air conditioning and refrigeration system. It is used for medium and low temperature commercial refrigeration systems such as domestic and commercial air conditioning, catering refrigeration, supermarket display case, food storage and processing. The replacement process does not need to change the expansion valve and line, no need to replace the frozen oil, direct replenishment, no need to drain the filled refrigerant.