COOLANT FILLING METHOD IN A REFRIGERATION DEVICE USING CARBON DIOXIDE AS COOLANT

摘要

Provided is a coolant filling method in a refrigeration device using carbon dioxide as a coolant, which method can reduce the time required for coolant filling and the time required until operation is enabled after the coolant filling. The coolant filling method in an air conditioner (1) using carbon dioxide as a coolant includes: a first coolant filling step and a second coolant filling step. The first coolant filling step fills a coolant in a gaseous state into a coolant filling object including coolant communication pipes (6, 7) until the pressure of the coolant filling object increases to a predetermined pressure from the filling start. The second coolant filling step fills a coolant in a liquid state into the coolant filling object until the coolant amount filled in the coolant filling object reaches a predetermined amount after the first coolant filling step.