Refrigeration cycle apparatus

A refrigeration cycle apparatus that is connected to a load through a water return header pipe and a water delivery header pipe connected with each other by a bypass pipe at which a bypass valve is provided, the refrigeration cycle apparatus comprising:

• a compressor configured to compress refrigerant and discharge the refrigerant to a refrigerant pipe;
• an air heat exchanger configured to exchange heat between air and the refrigerant flowing through the refrigerant pipe;
• an expansion valve configured to adjust pressure of the refrigerant flowing through the refrigerant pipe;
• a water heat exchanger configured to exchange heat between water supplied from the water return header pipe and the refrigerant and send out the water to the water delivery header pipe;
• an outlet pressure sensor provided on a water outlet side of the water heat exchanger and configured to measure water pressure;
• and
• a controller configured to control the compressor and the expansion valve,
• wherein
• an open tank is connected to the water return header pipe via a water pipe, the open tank being used for water replenishment,
• the water heat exchanger, a water pipe connected to the water heat exchanger, the water return header pipe and the water delivery header pipe are provided at a substantially equal height from the ground such that a difference in a maximum height and a minimum height of the water heat exchanger, the water pipe connected to the water heat exchanger, the water return header pipe, and the water delivery header pipe is no greater than 100 centimeters, and
• the controller is configured to control an opening degree of the bypass valve such that a value of water pressure measured by the outlet pressure sensor is equal to a preset target value.