Vehicle air-conditioning device

A vehicle air-conditioning device comprising:

• a refrigerant circuit including a compressor, an indoor heat exchange unit, and an external heat exchange unit;
• an air-conditioning unit in which the indoor heat exchange unit is disposed;
• and
• a control device that controls the refrigerant circuit and the air-conditioning unit,
• wherein the refrigerant circuit has a hot gas bypass that decompresses at least part of refrigerant compressed by the compressor without the refrigerant passing through the indoor heat exchange unit and the external heat exchange unit, and returns the decompressed refrigerant to the compressor, and
• the control device
• is capable of executing a hot gas heating operation of heating an inside of a cabin by causing part of the refrigerant compressed by the compressor to dissipate heat in the indoor heat exchange unit without causing the refrigerant to absorb heat in the external heat exchange unit,
• performs, at a start of the hot gas heating operation, a preparatory operation of circulating refrigerant in the refrigerant circuit without heat dissipation in the indoor heat exchange unit or with the heat dissipation suppressed until the refrigerant is brought into a predetermined state, and
• limits air quantity adjustment by an occupant on a quantity of air blown from the air-conditioning unit into the cabin at least during the preparatory operation.