To solve a problem on a risk of adversely affecting personnel in a building in a case when a carbon dioxide refrigerant leaks to an indoor unit side, as the carbon dioxide refrigerant is harmful to humans, in an air conditioning device using a refrigeration circuit applying carbon dioxide as the refrigerant.
This air-conditioning indoor unit A includes a sensor 11 disposed at a supply-side space 32 of a ventilation flue 33, a ventilation air trunk 20 for communicating an outdoor circulation port connected to an outdoor side with a ventilation flue circulation port 35 connected to a suction-side space 31 of the ventilation flue 33, a ventilator 13 disposed in the ventilation air trunk 20 for distributing the air outdoors or to the suction-side space 31 of the ventilation flue 33, and a first control means for stopping an air blower 2 and operating the ventilator 13 to blow off the air in the suction-side space 31 outdoors from the ventilation air trunk 20, when a concentration of carbon dioxide detected by the sensor 11 reaches a first concentration value or more immediately badly affecting a person staying indoors.
TAMURA NAOMICHI
Tadahiko Inaba
Kanako Murakami
Nakatsuru Kazutaka