Air conditioner

An air conditioner comprising:

• a heat pump cycle including a compressor configured to compress and discharge a refrigerant, a heating part configured to heat air to be blown into a space to be air-conditioned using a high-pressure refrigerant discharged from the compressor as a heat source, and a low-temperature side water-refrigerant heat exchanger configured to cause a low-pressure refrigerant to absorb heat of a heat medium;
• a heat medium circuit in which the heat medium is circulated, the heat medium circuit being provided with a heat medium passage of the low-temperature side water-refrigerant heat exchanger, and a heat generating part configured to heat the heat medium to flow into the heat medium passage of the low-temperature side water-refrigerant heat exchanger;
• a blower configured to blow the air toward the space to be air-conditioned;
• and
• a controller configured to set a heating preparation control in a case where a heating capability of the heating part is increased by using the heat generated by the heat generating part, wherein
• in the heating preparation control, the controller is configured to set a refrigerant discharge capability of the compressor to be equal to or less than a predetermined reference discharge capability, and to set a blowing capability of the blower to be equal to or less than a predetermined reference blowing capability, until an inlet-side heat medium temperature of the heat medium flowing into the heat medium passage of the low-temperature side water-refrigerant heat exchanger becomes equal to or higher than a target heat medium temperature.