Patent ID: 11898783
Assignee: DAIKIN INDUSTRIES, LTD.
Field: Thermal processes and apparatus (Mechanical engineering)
Classification: CPC F  Y | IPC F

Claim 5:
6. The performance degradation diagnosis system for a refrigeration cycle apparatus according to claim 1, wherein
the refrigeration cycle apparatus further includes
a heat-source-side fan configured to supply air to the heat-source-side heat exchanger and
an expansion valve disposed between the heat-source-side heat exchanger and the use-side heat exchanger in the refrigerant circuit to decompress refrigerant flowing in the refrigerant circuit, and

in a case in which a degree of subcooling in a refrigeration cycle of the refrigeration cycle apparatus which is operating has a value smaller than or equal to a third predetermined value, the control unit is configured to cause the refrigeration cycle apparatus to execute at least one of
an operation of increasing the number of rotations of the compressor,
an operation of increasing the number of rotations of the heat-source-side fan, and
an operation of decreasing an opening degree of the expansion valve,
to control the operation condition of the refrigeration cycle apparatus to the operation condition suitable to determine performance degradation of the refrigeration cycle apparatus.