According to the invention, there is provided a composition. The composition-2-butene (Z-HFO-1336mzz) and 2,2-dichloro-1, 1-trifluoro-ethanone as a Z-1,1,1,4,4,4- hexafluoropropane ( It comprises HCFC-123). According to the present invention, the refrigerant charge topping-off or a method is provided for replacement. This is chilled containing HCFC-123 as the coolant, air conditioning, heat pump, or a power cycle system, Z-HFO-1336mzz and, optionally, by the addition of the second coolant containing HCFC-123, the coolant and generating a refrigerant composition comprising a second refrigerant. According to the present invention, another method is provided. The method comprises the steps of replacing a refrigerant composition comprising a refrigeration, air conditioning, heat pump, or an HCFC-123 in the power cycle system, Z-HFO-1336mzz and, optionally, HCFC-123. ;
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