Air conditioner

An air conditioner comprising:

• a heat-source-side unit comprising:
• a compressor;
• and
• a heat-source-side heat exchanger;
• use-side units each comprising a use-side heat exchanger;
• an intermediate unit that causes the use-side heat exchanger of each of the use-side units to individually function as an evaporator or a radiator of a refrigerant;
• and
• two connection pipes that each connect the heat-source-side unit and the intermediate unit, wherein
• the intermediate unit comprises:
• an ejector that pressurizes the refrigerant evaporated in the use-side heat exchanger that is functioning as an evaporator by using a driving flow;
• and
• a gas-liquid separator into which the refrigerant flowing out from the ejector flows,
• the ejector pressurizes the refrigerant in a cooling main operation of a cooling-heating mixed operation in which a sum of cooling operation loads of the use-side units is greater than a sum of heating operation loads of the use-side units,
• the air conditioner further comprises a pipe that allows the refrigerant evaporated in the use-side heat exchanger that is functioning as the evaporator to be sucked into the ejector,
• the pipe comprises an on-off valve,
• one of the two connection pipes is a low-pressure-side gas connection pipe,
• the intermediate unit further comprises a switching mechanism that switches a path of the refrigerant between:
• a path flowing from an outlet of the use-side heat exchanger that is functioning as the evaporator to the low-pressure-side gas connection pipe, and
• a path from a gas-side outlet of the gas-liquid separator to the low-pressure-side gas connection pipe, and
• the air conditioner further comprises a controller that controls:
• the on-off valve, and
• the switching mechanism.