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

Claim 2:
3. 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,

the performance degradation factors include a decrease in an amount of refrigerant, and
in a case in which the first determining unit determines perforenone degradation of the refrigeration cycle apparatus due to the decrease in the amount of refrigerant, and a degree of subcooling in a refrigeration cycle of the refrigeration cycle apparatus which is operating has a value greater than a second predetermined value, the control unit is configured to cause the refrigeration cycle apparatus to execute at least one of
an operation of decreasing 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 increasing an increase 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.