Abstract: An air conditioning apparatus includes a plurality of third heat exchangers and flow rate control valves. In a heating mode, a controller opens a flow rate control valve corresponding to a heat exchanger that is being requested to perform air conditioning of the plurality of third heat exchangers, and closes a flow rate control valve corresponding to a heat exchanger that is not being requested to perform air conditioning of the plurality of third heat exchangers. In a defrosting mode, when a temperature of a second heat medium is lower than a first determination temperature, the controller opens a flow rate control valve corresponding to at least one of the heat exchangers that are not being requested to perform air conditioning. The at least one of the heat exchangers is assigned a higher priority than a remaining heat exchanger that is not being requested to perform air conditioning.

Abstract: A heat-pump water heater includes a refrigerant circuit, a water circuit, and a controller. The refrigerant circuit includes a main circuit and a bypass circuit. The main circuit includes a compressor, a water heat exchanger, a first pressure-reducing device, an air heat exchanger, and an air-sending device. The bypass circuit includes a second pressure-reducing device. The water circuit includes a hot water tank, a water pump, and the water heater exchanger. In a night-time hot-water supply mode, the controller causes the water pump with a lowest frequency set in advance, causes the compressor with a lowest frequency set in advance, and stops the air-sending device.

Abstract: A heat pump system includes a refrigerant circuit in which a compressor, a refrigerant flow path included in a heat medium heat exchanger, an expansion valve, and a heat source side heat exchanger are connected, the heat medium heat exchanger including the refrigerant flow path and a heat medium flow path; a heat medium feed path connected to the heat medium flow path included in the heat medium heat exchanger; an indoor unit connected to the heat medium feed path and configured to condition air inside a room; a room temperature sensor configured to detect an indoor temperature in the room; a heat medium temperature sensor configured to detect a temperature of a heat medium that flows into the indoor unit; and a controller configured to control the refrigerant circuit or the indoor unit by using a set temperature in the room.

Abstract: In a refrigeration cycle apparatus, at start-up of heating, a controller sets a first four-way valve to an ON state and sets a second four-way valve to an OFF state so as to form a flow path in which refrigerant flows through a compressor, a load-side heat exchanger, a first expansion valve, a heat-source-side heat exchanger, and an accumulator and returns to the compressor, and during a heating operation, the controller sets the first four-way valve to the ON state and sets the second four-way valve to the ON state so as to form a flow path in which the refrigerant flows through the compressor, the load-side heat exchanger, the first expansion valve, the receiver, and the heat-source-side heat exchanger and returns to the compressor.

Abstract: A chiller system includes: a chiller; a load; a feed pipe through which water flows from the chiller to the load; a return pipe through which water flows to the chiller from the load; a first controller configured to control the chiller; and a second controller configured to output a chiller operating command to the first controller, the chiller including a first sensor configured to measure an inlet water temperature of the water flowing through the return pipe to the chiller, a second sensor configured to measure an outlet water temperature of the water flowing through the feed pipe from the chiller, and a third sensor configured to measure an outside air temperature at a chiller installation location, and the first controller calculates a temperature range operational for the chiller based on an inlet water temperature, an outlet water temperature, and an outside air temperature, and then outputs information on the calculated temperature range to the second controller.

Abstract: A hot-water supply and heating system includes: a first pump that circulates a first heat medium between a heat source unit and a heat-medium heat exchanger; a second pump that causes a second heat medium to flow between a load-side device and the heat-medium heat exchanger; a first temperature sensor that detects a primary fluid temperature that is a temperature of the first heat medium that flows out of the heat source unit; a heat-source-unit controller; and a pump controller. The heat-source-unit controller transmits information indicating the heating capacity of the heat source unit reaches an upper limit value to the pump controller, when it is determined that the primary fluid temperature is lower than a target temperature and the heating capability of the heat source unit is equal to the upper limit value. The pump controller reduces an operation frequency of the second pump when receiving the above information.

Abstract: An air-conditioning device includes: a heat medium cycle circuit including: a pump, a plurality of indoor heat exchangers, and a plurality of flow control devices configured to control a flow rate of the heat medium through the heat medium cycle circuit; a heat-source-side device configured to heat or cool the heat medium; and a controller that includes a determination processing unit to determine whether the heat medium is caused to pass through the plurality of indoor heat exchangers where heat exchange is stopped, a selection processing unit to select, based on a determination from the determination processing unit, an indoor heat exchanger through which the heat medium is caused to pass from the plurality of indoor heat exchangers where heat exchange is stopped, and an instruction processing unit to instruct a release of a flow control device that corresponds to the indoor heat exchanger selected.

Abstract: A relay includes a first relay unit and a second relay unit provided between an outdoor unit and an indoor unit to allow refrigerant to circulate between the first relay unit and the outdoor unit and between the second relay unit and the outdoor unit, and a heat medium circuit connecting the first relay unit and the second relay unit to the indoor unit to allow a heat medium to circulate through the heat medium circuit. The second relay unit is installed above or on a top of the first relay unit.

Abstract: An outdoor unit of an air-conditioning apparatus, wherein the outdoor unit has a control box and an electrical box accommodated therein, in the control box, devices serving as a controller configured to control refrigeration cycle-related devices are accommodated, and in the electrical box, devices including a thermal relay are accommodated, the devices producing a smaller amount of heat compared to the devices accommodated in the control box, the electrical box being formed separately from the control box.

Abstract: An air-conditioning apparatus includes: an outdoor unit including a compressor that compresses and discharges refrigerant to a refrigerant circuit; an indoor unit including a load-side heat exchanger that causes heat exchange to be performed between air in an air-conditioned space and a heat medium subjected to heat exchange with the refrigerant; a flow rate detection unit that detects a flow rate of the heat medium; and an alarm unit provided in the indoor unit. The alarm unit includes a determination unit and an abnormality alarm unit. The determination unit determines whether an abnormality occurs in the indoor unit or not based on the flow rate detected by the flow rate detection unit. The abnormality alarm unit outputs an alarm when the determination unit determines that the abnormality occurs in the indoor unit.

Abstract: An air conditioning apparatus includes: a second heat exchanger; a plurality of third heat exchangers; and a plurality of flow rate control valves. In a defrosting mode, when a heat exchanger that is not being requested to perform air conditioning includes a first device having a set temperature lower than or equal to a current room temperature and a second device which is set so as not to perform air conditioning, a controller is configured to control a first flow rate control valve corresponding to the first device and a second flow rate control valve corresponding to the second device such that a degree of opening of the first flow rate control valve is higher than or equal to a degree of opening of the second flow rate control valve.

Abstract: An air-conditioning apparatus includes outdoor units each including a compressor and outdoor heat exchanger, refrigerant flowing through the outdoor units; an indoor unit including an indoor heat exchanger, a heat medium flowing through the indoor unit; relay devices to which the outdoor units are connected, and to which the indoor unit is connected, each relay device includes a heat medium heat exchanger that exchanges heat between the refrigerant and the heat medium; and a controller. The controller controls action of the outdoor units, the indoor unit, and the relay devices. The controller determines necessity for a defrosting operation; responsive the defrosting operation being necessary, compares an indoor unit total load with an outdoor unit total capacity; and controls an operating frequency of the compressor of an outdoor unit other than the outdoor unit on which the defrosting operation is to be performed to increase the outdoor unit total capacity.

Abstract: An air-conditioning apparatus includes: a heat medium circulation circuit including: a heat medium device, a heat medium pipe, a pump, a heat medium detection unit, and a controller that includes a count unit to count an air-conditioning operation time and count a pump operation time based on heat medium detection information of the heat medium detection unit, a storage unit storing a set air-conditioning time and a set pump time, a comparison unit to compare the air-conditioning operation time with the set air-conditioning time and compare the pump operation time with the set pump time, and a device control unit to control driving of the pump so that the pump operation time reaches or exceeds the set pump time when the air-conditioning operation time is longer than or equal to the set air-conditioning time and the pump operation time is shorter than the set pump time.

Abstract: An air-conditioning apparatus according to the present disclosure includes a heat medium circulation circuit, a heat-source-side device, and a voltage drop device. In the heat medium circulation circuit, a pump, an indoor heat exchanger, and a flow control device are connected by pipes to circulate the heat medium. The pump sends a heat medium that contains water or brine and transfers heat. The indoor heat exchanger causes heat exchange to be performed between the heat medium and an indoor air in an air-conditioned space. The flow control device controls a flow rate of the heat medium in the indoor heat exchanger. The heat-source-side device heats or cools the heat medium before the heat medium is sent to the indoor heat exchanger. The voltage drop device reduces a voltage that is applied to the pump based on a value of a current that is supplied to the pump, in association with a flow rate of the heat medium in the heat medium circulation circuit.

Abstract: A free cooling outdoor unit includes: a refrigerant circuit through which refrigerant circulates; a brine circuit through which brine circulates; a water circuit through which water circulates; a fan configured to send air to the second heat exchanger; a flow control valve configured to control a circulation amount of the brine in the brine circuit; a water temperature detection sensor configured to detect a water temperature in the water circuit; an outside air temperature sensor; and a controller configured to control, where the outside air temperature is equal to or lower than a freezing temperature of the brine, the circulation amount of the brine based on the water temperature such that a brine temperature is prevented from reaching a temperature equal to or lower than the freezing temperature of the brine.

Abstract: An outdoor unit for a refrigeration cycle apparatus includes: a heat exchanger having an outer surface inclined downward; a drain pan on which the heat exchanger is set; a top frame on which a fan is set, the top frame being disposed at a top of the heat exchanger; and a support attached to the drain pan and the top frame, the support extending between the drain pan and the top frame.

Abstract: The heat-medium cycle circuit includes a discharge mechanism including a discharge valve, the discharge mechanism being configured to, when the discharge valve is open, discharge air present inside the heat-medium cycle circuit to the outside of the heat-medium cycle circuit. The air-conditioning apparatus is configured to execute an air discharge operation mode in which the air present inside the heat-medium cycle circuit is discharged to the outside of the heat-medium cycle circuit. The air discharge operation mode includes a first operation mode, and a second operation mode performed after the first operation mode. The first operation mode is an operation mode in which, with the discharge valve being closed, an operation similar to a cooling operation is performed. The second operation mode is an operation mode in which, with the discharge valve being open, an operation similar to a heating operation is performed.

Abstract: When heating is being performed, and a temperature detected by a temperature sensor is lower than a first determination value, a controller opens the flow rate control valve corresponding to a heat exchanger, of the third heat exchangers, to which a request for air conditioning has not been made, and closes the flow rate control valve corresponding to a heat exchanger, of the third heat exchangers, to which the request for air conditioning has been made. When heating is being performed, and the temperature detected by the temperature sensor is higher than a second determination value, the controller opens the flow rate control valve corresponding to the heat exchanger to which the request for air conditioning has been made, and closes the flow rate control valve corresponding to the heat exchanger to which the request for air conditioning has not been made.

Abstract: An air-conditioning apparatus includes: a heat-medium transfer device including a pump provided to transfer a heat medium that contains water or brine and transfers heat; a plurality of indoor units each of which includes an indoor heat exchanger provided to cause heat exchange to be performed between indoor air and the heat medium, and a flow control valve provided to adjust a flow rate of the heat medium that flows through the indoor heat exchanger, the plurality of indoor units being connected to the heat-medium transfer device by respective heat medium pipes; and a controller provided to control an opening degree of the flow control valve.