Refrigeration cycle apparatus

A method for preventing refrigerant leakage, comprising:

• providing a refrigeration cycle apparatus including a heat source having a compressor, a plurality of utilization systems including a first utilization system that constitutes a refrigerant circuit together with the heat source, and a first opening degree adjustment valve provided for the first utilization system;
• controlling, by control circuitry of the refrigeration cycle apparatus, the first opening degree adjustment valve to adjust an evaporation temperature or a condensation temperature in the first utilization system;
• detecting, by a first sensor provided in the first utilization system, leakage of a refrigerant;
• and
• in response to the first sensor detecting leakage of the refrigerant, fully closing, by the control circuitry, the first opening degree adjustment valve to block the refrigerant leaking from the first utilization system.

A non-transitory computer-readable medium storing a program that, when executed by a processor of control circuitry in a refrigeration cycle apparatus including a heat source having a compressor, a plurality of utilization systems including a first utilization system that constitutes a refrigerant circuit together with the heat source, a first opening degree adjustment valve provided for the first utilization system, and a first sensor that detects leakage of a refrigerant in the first utilization system, causes the control circuitry to:

• control the first opening degree adjustment valve to adjust an evaporation temperature or a condensation temperature in the first utilization system;
• receive a detection signal from the first sensor indicating leakage of the refrigerant;
• and
• in response to receiving the detection signal, fully close the first opening degree adjustment valve to block the refrigerant leaking from the first utilization system.