Relay unit and air-conditioning apparatus including the same

A relay unit to be connected between a heat source side unit and a load side unit, the relay unit comprising:

• a heat medium heat exchanger that is to be connected to the heat source side unit via refrigerant pipes and that is to be connected to the load side unit via heat medium pipes;
• a casing containing the heat medium heat exchanger;
• a first refrigerant pipe connection port to be connected to one of the refrigerant pipes, the refrigerant pipes including a refrigerant pipe through which refrigerant flows from the heat source side unit into the heat medium heat exchanger and a refrigerant pipe through which the refrigerant flows out from the heat medium heat exchanger into the heat source side unit;
• a second refrigerant pipe connection port to be connected to an other of the refrigerant pipes;
• a first heat medium pipe connection port to be connected to one of the heat medium pipes, the heat medium pipes including a heat medium pipe through which a heat medium flows from the load side unit into the heat medium heat exchanger and a heat medium pipe through which the heat medium flows out from the heat medium heat exchanger into the load side unit;
• and
• a second heat medium pipe connection port to be connected to an other of the heat medium pipes,
• wherein the first refrigerant pipe connection port, the second refrigerant pipe connection port, the first heat medium pipe connection port, and the second heat medium pipe connection port are provided on a top surface of the casing and face in a direction opposite to a direction of gravity,
• the casing has a cuboid shape and has the top surface, a first side, a second side facing the first side, a third side adjacent to the first side and the second side, a fourth side facing the third side, and a bottom surface facing the top surface,
• the first heat medium pipe connection port is provided closer to the first side,
• the second heat medium pipe connection port is provided closer to the second side, and
• a height of the first heat medium pipe connection port is lower than a height of the second heat medium pipe connection port.