Abstract: A refrigeration cycle apparatus according to the present invention performs cooling by circulation of refrigerant. The refrigeration cycle apparatus includes an evaporator, a condenser, a pump, a compressor, and a controller. The evaporator is arranged in a first space. The condenser is arranged in a second space. The pump is configured to compress refrigerant from the condenser and output the refrigerant to the evaporator. The compressor is configured to compress refrigerant from the evaporator and output the refrigerant to the condenser. The controller is configured to control the pump and the compressor to cool the first space. The controller is configured to turn on the pump after turn-on of the compressor while a temperature of the first space is higher than a temperature of the second space.

Abstract: A refrigeration cycle apparatus according to the present invention performs cooling by circulation of refrigerant. The refrigeration cycle apparatus includes an evaporator, a condenser, a pump, a compressor, and a control device. The evaporator is arranged in a first space. The condenser is arranged in a second space. The pump is configured to compress refrigerant from the condenser and output the refrigerant to the evaporator. The compressor is configured to compress refrigerant from the evaporator and output the refrigerant to the condenser. The control device is configured to control the pump and the compressor to cool the first space. The control device is configured to turn on the pump after turn-on of the compressor while a temperature of the first space is higher than a temperature of the second space.

Abstract: A refrigeration cycle apparatus includes: a refrigerant circuit, a use side heat exchanger, a pressure reducing device, and a heat source side heat exchanger; A fan is provided together with at least one, selected from between, the use side heat exchanger and the heat source side heat exchanger and that has a fan motor; a relay unit connected to a direct-current supply device via the direct-current circuit breaker; a resistor unit connected in parallel to the relay unit; a DC/AC converter configured to convert a direct-current voltage supplied from the direct-current supply device via either the relay unit or the resistor unit into an alternating-current voltage and to supply the alternating-current voltage to at least one, selected from between, the compressor motor and the fan motor; and an opening and closing control unit configured to bring the relay unit into an open state when the direct-current circuit breaker becomes open.

Abstract: An air-conditioning apparatus prevents a compressor from not starting for a long time when an actual air conditioning load is low or when exhaust heat from heat-generating devices in an air-conditioned indoor space is not returned to an indoor unit, and reduces the number of times the compressor is started and stopped. The air-conditioning apparatus includes a refrigerant circuit sequentially annularly connecting the compressor, a heat source-side heat exchanger, an expansion valve, and a use-side heat exchanger, a blowing temperature sensor detecting a blowing temperature of air brown into the air-conditioned indoor space after passing through the use-side heat exchanger in the indoor unit including the use-side heat exchanger, and a compressor control unit performing thermo-on and thermo-off controls to start and stop the compressor, to approximate the blowing temperature detected by the blowing temperature sensor to a preset temperature.

Abstract: A refrigeration cycle apparatus includes: a refrigerant circuit, a use side heat exchanger, a pressure reducing device, and a heat source side heat exchanger; A fan is provided together with at least one, selected from between, the use side heat exchanger and the heat source side heat exchanger and that has a fan motor; a relay unit connected to a direct-current supply device via the direct-current circuit breaker; a resistor unit connected in parallel to the relay unit; a DC/AC converter configured to convert a direct-current voltage supplied from the direct-current supply device via either the relay unit or the resistor unit into an alternating-current voltage and to supply the alternating-current voltage to at least one, selected from between, the compressor motor and the fan motor; and an opening and closing control unit configured to bring the relay unit into an open state when the direct-current circuit breaker becomes open.

Abstract: An air-conditioning apparatus prevents a compressor from not starting for a long time when an actual air conditioning load is low or when exhaust heat from heat-generating devices in an air-conditioned indoor space is not returned to an indoor unit, and reduces the number of times the compressor is started and stopped. The air-conditioning apparatus includes a refrigerant circuit sequentially annularly connecting the compressor, a heat source-side heat exchanger, an expansion valve, and a use-side heat exchanger, a blowing temperature sensor detecting a blowing temperature of air brown into the air-conditioned indoor space after passing through the use-side heat exchanger in the indoor unit including the use-side heat exchanger, and a compressor control unit performing thermo-on and thermo-off controls to start and stop the compressor, to approximate the blowing temperature detected by the blowing temperature sensor to a preset temperature.