Abstract: In an air-conditioning apparatus including a plurality of indoor units connected to a heat medium converter and a plurality of remote controllers respectively provided for the indoor units, the remote controllers each include a temperature sensor that detect a temperature of a corresponding space to be air-conditioned, and are each configured to communicate with a heat medium converter controller of the heat medium converter and an indoor unit controller of the corresponding indoor unit, transmit an instruction to start and stop an operation and data related to rotation speed of an indoor air-sending device to the corresponding indoor unit controller, and transmit the instruction to start and stop the operation, and a target temperature and a temperature detected by the temperature sensor or a difference therebetween, to the heat medium converter controller.

Abstract: In an air-conditioning apparatus, a heat source side heat exchanger, intermediate heat exchangers, and use side heat exchangers are formed in separate bodies respectively and adapted to be disposed at separate locations one another. In a heat medium circulation circuit where the intermediate heat exchanger and the use side heat exchanger are connected, temperature sensors are installed. An anti-freezing operation mode is provided in which, when the detection temperatures of the temperature sensors become equal to or lower than a set temperature Ts while a compressor or pumps are stopped, the heat medium is circulated to perform anti-freezing of the heat medium.

Abstract: An air-conditioning apparatus is capable of completing heat medium freeze prevention control more quickly by performing heat medium temperature rise control for raising the temperature of a cooled heat medium and includes a controller that adjusts a current opening degree of a bypass device at a bypass pipe to an opening degree, and that makes an adjustment such that the flow passage resistance in the case of the opening degree becomes equal to the flow passage resistance in the case of an opening degree before an expansion device is adjusted to a minimum opening degree.

Abstract: A compound valve includes a body having a valve chamber; a cylindrical-shaped valve element having opening portions in its lateral side surface for allowing heat media to flow inside of the valve element, and a partition member there inside in the longitudinal direction; and a motor for controlling a rotation angle of the valve element, and the opening portions communicate with either one of a first heat-medium inflow port or a second heat-medium inflow port, and with either one of a third heat-medium outflow port or a fourth heat-medium outflow port; two heat media having different properties flow adjacent to the partition member; and, by controlling, by a rotation angle of the motor, areas of the communicating inflow ports and the opening portions, and those of the communicating outflow ports and the opening portions, the quantities of flow are controlled.

Abstract: An air-conditioning apparatus includes a refrigerant circuit in which a compressor, a heat-source-side heat exchanger, an expansion device, and a refrigerant flow path in at least one intermediate heat exchanger are connected by a refrigerant pipe, and a heat medium circuit in which a pump, a use-side heat exchanger, and a heat-medium flow path in the at least one intermediate heat exchanger are connected by a heat-medium conveying pipe, the heat medium circuit being configured to cause a heat medium to circulate therethrough. The at least one intermediate heat exchanger comprises a plurality of intermediate heat exchangers. The plurality of intermediate heat exchangers are operative in a heating only operation mode, a cooling only operation mode, and a cooling and heating mixed operation mode in which some of the intermediate heat exchangers serve as the condenser and others of the intermediate heat exchangers serve as the evaporator.

Abstract: An air-conditioning apparatus, including an outdoor unit including a compressor and an outdoor heat exchanger, a plurality of indoor units each including an indoor heat exchanger, and a relay unit configured to distribute refrigerant supplied from the outdoor unit to the plurality of indoor units, the relay unit including a first branch unit in which liquid-side pipes connected to the plurality of indoor units join together, and a refrigerant shutoff valve, which is configured to control bidirectional flow of the refrigerant, and is provided to the first branch unit, the number of the refrigerant shut off valve being smaller than a number of the plurality of indoor units.

Abstract: In a heating medium channel switching device, a valve body whose interior is partitioned into two channels by a partition plate is axially rotated by a motor, whereby a relative position of the valve body in a valve chamber is controlled. Because of this, one of a first heating medium and second heating medium can be selected and caused to flow out in one channel, and one of a third heating medium and fourth heating medium can be selected and caused to flow in the other channel. Also, heating medium flow can be controlled by an angle of rotation of the valve body being controlled.

Abstract: A heat-medium flow-path switching device and a heat-medium flow-rate adjusting device are integrated into an integrated heat-medium flow-rate adjusting device. The integrated heat-medium flow-rate adjusting device is configured to perform the heat-medium flow-path switching function and the meat-medium flow-rate adjusting function by driving and controlling a single drive unit. Moreover, the integrated heat-medium flow-path switching device is configured to perform a function of closing flow paths from/to a use-side heat exchanger added to the heat-medium flow-rate adjusting function.

Abstract: To obtain an air-conditioning apparatus that does not make a refrigerant circulate up to an indoor unit and further can achieve energy-saving. A refrigeration cycle is configured by connecting a compressor that pressurizes a refrigerant, a four-way valve that switches a circulation path of the refrigerant, a heat source side heat exchanger that performs heat exchange, expansion valves for pressure-adjusting the refrigerant, and a plurality of intermediate heat exchangers that performs heat exchange between the refrigerant and the heat medium to heat and cool the heat medium, with piping. A heat medium circuit is configured by connecting intermediate heat exchangers, pumps that pressurize the heat medium, and a plurality of use side heat exchangers that perform heat exchange between the heat medium and the air in the indoor space, with piping.

Abstract: In an air-conditioning apparatus, when a plurality of pumps are all operating and a heat exchange amount in use-side heat exchangers is equal to or lower than a lower limit of a thermal capacity that can be conveyed in a heat medium circuit B, before at least one of the plurality of pumps is stopped, a refrigerant flow path in the intermediate heat exchanger connected to the pump that is to be stopped is closed. Then, the at least one of the plurality of pumps is stopped, and the thermal capacity required in at least one of the use-side heat exchangers in the rest of the plurality of pumps is conveyed.

Abstract: Obtained is a heat medium relay unit capable of having improved serviceability and an air-conditioning apparatus equipped with the heat medium relay unit. Heat medium flow control devices are each disposed below a corresponding one of the first heat medium flow switching devices. The heat medium flow control devices are similarly disposed in a zigzag manner along with the zigzag arrangement of the first heat medium flow switching devices.

Abstract: Provided are a refrigeration cycle that is formed by connecting a compressor, a condenser, expansion means, and an evaporator and that performs cooling operation; an evaporator heating device that heats the evaporator; a drain pan that receives drain-water from the evaporator and drains the drain-water; a drain-pan heating device that heats the drain pan; frost detecting means including a light-emitting element that emits light to the evaporator and a light-receiving element that receives reflected light from the evaporator and outputs a voltage according to the reflected light; and a control device that controls on-off operation of the evaporator heating device and the drain-pan heating device. The control device determines a frosting condition on the evaporator from an output of the frost detecting means and individually controls the evaporator heating device and the drain-pan heating device in accordance with the determination result.

Abstract: A refrigeration cycle is configured by connecting a compressor, a four-way valve, a heat source side heat exchanger, expansion valves, and intermediate heat exchangers by piping. A heat medium circulation circuit is configured by connecting intermediate heat exchangers, pumps, and use side heat exchangers by piping. The outdoor unit accommodates the compressor, the four-way valve, and the heat source side heat exchanger, and the relay unit that is installed in a non-subject space which is different from an indoor space and is on an installation floor separated by two or more floors and accommodates the expansion valves, the pump, and intermediate heat exchangers are connected by two pipelines. The relay unit and an indoor unit that accommodates use side heat exchangers and is installed at a position where an indoor space can be air-conditioned are connected by two pipelines.

Abstract: In an air-conditioning apparatus, an expansion device, a second refrigerant flow switching device, and heat exchangers related to heat medium, connected between the expansion device and the second refrigerant flow switching device such that a heat source side refrigerant flows in parallel, are connected in a part of refrigerant passages, and an expansion device, a second refrigerant flow switching device, and heat exchangers related to heat medium, connected between the expansion device and the second refrigerant flow switching device such that the heat source side refrigerant flows in series, are connected in the rest of the refrigerant passages.

Abstract: A refrigeration cycle that is formed by connecting a compressor, a condenser, an expansion valve, and an evaporator and that performs cooling operation; an evaporator heating device that heats the evaporator; a drain pan that receives drain-water from the evaporator and drains the drain-water; a drain-pan heating device that heats the drain pan; a frost detecting device including a light-emitting element that emits light to the evaporator and a light-receiving element that receives reflected light from the evaporator and outputs a voltage according to the reflected light; and a control device that controls on-off operation of the evaporator heating device and the drain-pan heating device. The control device determines a frosting condition on the evaporator from an output of the frost detecting device and individually controls the evaporator heating device and the drain-pan heating device in accordance with the determination result.

Abstract: An air-conditioning apparatus includes a refrigerant circuit including a compressor, a first refrigerant flow switching device, a plurality of intermediate heat exchangers, a first expansion device, and a heat-source-side heat exchanger, through all of which a refrigerant circulates and all of which in combination form a refrigeration cycle; and a heat medium circuit including the plurality of intermediate heat exchangers, a pump, and a plurality of use-side heat exchangers, through all of which a heat medium circulates. The air-conditioning apparatus further includes a heat medium energy storage that is connected to the heat medium circuit and stores the heat medium; and an intra-storage heat exchanger that is connected to the refrigerant circuit and heats or cools the heat medium in the heat medium energy storage by using the heat-source-side refrigerant supplied thereto.

Abstract: When using at least one of heat exchangers related to heat medium that exchange heat between a heat source side refrigerant and a heat medium as an evaporator, in a case where an air-conditioning apparatus has detected, in the heat exchanger related to heat medium that functions as the evaporator, an evaporating temperature of the heat source side refrigerant which causes the temperature of the heat medium passing through this heat exchanger related to heat medium to become equal to or lower than a freezing temperature, the air-conditioning apparatus performs a heat medium anti-freezing operation by blocking entry of the heat source side refrigerant into the heat exchanger related to heat medium that functions as the evaporator, and causing the heat source side refrigerant to flow to a bypass pipe.

Abstract: To provide an air-conditioning apparatus which achieves improvement of safety and further achieves saving of energy without circulating a refrigerant in or near an indoor unit. The air-conditioning apparatus includes one expansion device disposed on an outlet side of a heat exchanger related to the heat medium on the heating side. Another expansion device is disposed on an inlet side of a heat exchanger related to the heat medium on the cooling side such that the expansion devices are directly connected through a connecting pipe.

Abstract: An object is to provide a refrigeration cycle apparatus that does not cause unevenness of capacity among branch units and a failure in controlling a refrigerant circuit. At least one of branch units is a first branch unit having a minimum pressure loss in distribution of refrigerant in a high-pressure refrigerant pipe between a heat source unit and the branch units, and at least another one of the branch units is a second branch unit having a maximum pressure loss in distribution of refrigerant in the high-pressure refrigerant pipe between the heat source unit and the branch units. An opening degree of an expansion device is controlled in such a manner that a differential pressure between a refrigerant pressure detected by a high-pressure detecting device of the first branch unit and a refrigerant pressure detected by an intermediate-pressure detecting device is greater than or equal to a set value ?PHM.