Patent attributes
A refrigerating and air-conditioning apparatus including a refrigerant circuit, which in turn includes an outdoor unit, and an indoor unit, connected by an extension pipe. The apparatus further includes a control unit having a memory, and is configured to calculate an internal volume of the extension pipe and calculate a standard refrigerant amount, serving as a criterion for determining whether the refrigerant is leaked from the refrigerant circuit, on the basis of the calculated refrigerant extension pipe internal volume. The memory is configured to store the refrigerant extension pipe internal volume and the standard refrigerant amount. The control unit is configured to calculate a total amount of refrigerant in the refrigerant circuit on the basis of the refrigerant extension pipe internal volume stored in the memory and operation data measured during normal operation, and compare the calculated total refrigerant amount with the standard refrigerant amount stored in the memory to determine whether refrigerant is leaked.
