Patent ID: 8479526

Claim:
A refrigerant charging method, comprising: installing on site a refrigeration device having an indoor unit and an outdoor unit and having carbon dioxide used as a refrigerant, the indoor unit and the outdoor unit being connected using interconnecting piping, and the refrigerant being subsequently charged on-site into the refrigeration device; connecting a container containing the refrigerant to a space in the refrigeration device that is intended to be charged by the refrigerant, a heater being interposed between the container and the refrigeration device; and moving the refrigerant from the container to the intended charging space via the heater, heating the refrigerant that has exited the container by the heater so that a specific enthalpy of the refrigerant when entering the intended charging space will be 430 kJ/kg or higher when moving the refrigerant from the container to the intended charging space via the heater.