REFRIGERANT CHARGING METHOD IN REFRIGERATION SYSTEM USING CARBON DIOXIDE AS REFRIGERANT

摘要

The present invention provides a refrigerant charging method in a refrigeration system that uses carbon dioxide as a refrigerant, which refrigerant charging method can shorten the amount of time for charging the refrigeration system with the refrigerant and the amount of time until the refrigeration system becomes operable after being charged with the refrigerant. A refrigerant charging method in an air conditioner (1) that uses carbon dioxide as a refrigerant includes a first refrigerant charging step and a second refrigerant charging step. The first refrigerant charging step is a step of charging a refrigerant charging target portion including refrigerant communication pipes (6,7) with refrigerant in a gas state until the pressure of the refrigerant charging target portion rises to a predetermined pressure after the start of charging. The second refrigerant charging step is a step of charging the refrigerant charging target portion with refrigerant in a liquid state until the amount of refrigerant charging the refrigerant charging target portion becomes a predetermined amount after the first refrigerant charging step.