R-407c

R-407c is a mixture of hydrofluorocarbons used as a refrigerant. It is a zeotropic blend of difluoromethane (R-32), pentafluoroethane (R-125), and 1,1,1,2-tetrafluoroethane (R-134a). Difluoromethane serves to provide the heat capacity, pentafluoroethane decreases flammability, tetrafluoroethane reduces pressure.^[1] R-407c cylinders are colored burnt orange.

This refrigerant is intended as a replacement for R-22. R-22 has been scheduled to be phased out by the year 2035. Already there is no equipment available with R-22 as its refrigerant. Currently some manufacturers are making replacement equipment available with a holding charge of nitrogen. It is best to put R-407c in these because they have polyolester oil.

It is not recommended to drop R-407c into R-22 systems on top of the existing charge in cases of low refrigerant levels. A licensed professional should be contracted to completely remove the R-22 and as much of the mineral oil as possible. In the case of compressor change-outs, replacement compressors are already manufactured with POE (polyolester) oil and are therefore more compatible with R-407c than returning the recovered R-22. The recovered R-22 can be sent to a facility for disposal.

It is cost effective to replace R-22 with R-407c before there is an emergency. Preventive maintenance programs should include strong suggestions to replace ozone depleting refrigerants such as R-22 with environmentally friendly refrigerants and it seems that R-407c has become the front runner. There are many millions of tons of R-22 in air conditioning and refrigeration equipment in use today and most of it is destined to end up in the atmosphere in spite of efforts to curtail this probability. These efforts have been in place since the late 1980s.

References

↑ A brief history of refrigerant

Halomethanes

Monosubstituted	CH₃F CH₃Cl CH₃Br CH₃I

Disubstituted	CH₂F₂ CH₂ClF CH₂BrF CH₂FI CH₂Cl₂ CH₂BrCl CH₂ClI CH₂Br₂ CH₂BrI CH₂I₂

Trisubstituted	CHF₃ CHClF₂ CHBrF₂ CHF₂I CHCl₂F CHBrClF CHClFI CHBr₂F CHBrFI CHFI₂ CHCl₃ CHBrCl₂ CHCl₂I CHBr₂Cl CHBrClI CHClI₂ CHBr₃ CHBr₂I CHBrI₂ CHI₃

Tetrasubstituted	CF₄ CClF₃ CBrF₃ CF₃I CCl₂F₂ CBrClF₂ CClF₂I CBr₂F₂ CBrF₂I CF₂I₂ CCl₃F CBrCl₂F CCl₂FI CBr₂ClF C*BrClFI CClFI₂ CBr₃F CBr₂FI CBrFI₂ CFI₃ CCl₄ CBrCl₃ CCl₃I CBr₂Cl₂ CBrCl₂I CCl₂I₂ CBr₃Cl CBr₂ClI CBrClI₂ CClI₃ CBr₄ CBr₃I CBr₂I₂ CBrI₃ CI₄

* Chiral compound.

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