Abstract: An air conditioning system includes: an outdoor unit including a first refrigerant circuit that includes a compressor and a first heat exchanger; a first indoor unit disposed in a first indoor space and that includes a second heat exchanger; a second indoor unit including a third heat exchanger; an intermediate unit including an intermediate refrigerant circuit that causes the second heat exchanger and the third heat exchanger to individually function as an evaporator or a condenser; and a first auxiliary refrigerant circuit including a first auxiliary heat exchanger and a second auxiliary heat exchanger connected in series to the first auxiliary heat exchanger via a refrigerant pipe.

Abstract: An air conditioning system includes: an outdoor unit that includes a first refrigerant circuit including a compressor, and a first heat exchanger; an indoor unit in a first space and that includes a second refrigerant circuit including a second heat exchanger; a liquid side pipe and a gas side pipe each connecting the first refrigerant circuit to the second refrigerant circuit; an outdoor air treatment unit including a first auxiliary refrigerant circuit including a first auxiliary heat exchanger connected to a first branching pipe branching from the liquid side pipe, and a second branching pipe branching from the gas side pipe, and a supply fan that supplies outdoor air having passed through the first auxiliary heat exchanger to the first space; a first shutoff valve on the first branching pipe; and a second shutoff valve on the second branching pipe.

Abstract: An air conditioner includes an indoor unit, an outdoor unit, an outdoor expansion valve, an indoor expansion valve, and a controller. The controller executes first control and second control. The first control includes stopping cooling operation or heating operation if a first condition is satisfied during cooling operation or heating operation, and then starting cooling operation or heating operation if a second condition is satisfied. The first condition indicates that a heat load in a target space is low. The second condition relates to the heat load in the target space. The second control includes setting opening degrees of the outdoor expansion valve and the indoor expansion valve upon a start of cooling operation or heating operation according to the first control to be larger than opening degrees upon satisfaction of the first condition.