Heat source side unit and air-conditioning apparatus

A heat source side unit connected to a load side unit configured to supply a capacity to a load by a pipe and constituting a refrigerant circuit, the heat source side unit comprising:

• a compressor configured to compress refrigerant and discharge the refrigerant;
• a heat source side heat exchanger configured to serve as an evaporator or a radiator;
• a channel switching valve configured to switch a flow of the refrigerant based on a function of the heat source side heat exchanger;
• a gas-liquid separator configured to separate inflow of the refrigerant into liquid refrigerant and gas refrigerant, the gas-liquid separator having a liquid refrigerant outlet from which the liquid refrigerant flows out and a gas refrigerant outlet of the gas-liquid separator from which the gas refrigerant flows out, the liquid refrigerant outlet being connected to a refrigerant inflow pipe at a refrigerant inflow side of the heat source side heat exchanger when the heat source side heat exchanger serves as the evaporator;
• a bypass pipe connecting the gas refrigerant outlet of the gas-liquid separator to a refrigerant outflow pipe at a refrigerant outflow side of the heat source side heat exchanger when the heat source side heat exchanger serves as the evaporator;
• and
• a connecting pipe configured to branch the refrigerant which flows from the load side unit to the channel switching valve into two branches when the heat source side heat exchanger serves as the radiator, one of the two branches configured to flow a part the refrigerant to the channel switching valve and another of the two branches configured to flow another part of the refrigerant into the gas-liquid separator and to bypass the channel switching valve.