Unlike most non-azeotrpoic refrigerants R-410A can be topped off?
Unlike most non-azeotropic refrigerants, R-410A cannot be topped off. This is because R-410A is a blend of two different refrigerants, HFC-32 and HFC-125. When these two refrigerants are mixed together, they form a constantboiling mixture, which means that they will always vaporize and condense at the same temperature.