Abstract: An air-conditioning apparatus includes a refrigerant circuit formed by connecting, with pipes, a compressor, a first refrigerant flow switching device, a heat-source-side heat exchanger, an expansion device, and a plurality of intermediate heat exchangers. A heat medium circuit is formed by connecting, with pipes, a plurality of pumps configured to pressurize and circulate the heat medium subjected to heat exchange in the plurality of intermediate heat exchangers, a plurality of use-side heat exchangers each configured to exchange heat between the heat medium and air in an air-conditioned space, and a heat-medium flow switching/control device configured to switch which of the heat medium is to be allowed to flow into and out of each of the use-side heat exchangers; and a controller configured to perform processing for controlling the switching performed by the heat-medium flow switching/control device, in accordance with a capacity of each of the use-side heat exchangers.

Abstract: An apparatus including a refrigerant circuit having a compressor, a heat source side heat exchanger and two or more heat exchangers related to heat medium. A heat medium circuit includes two heat medium loops each including a pump. A bypass piping is provided at the refrigerant circuit for bypassing the heart exchanger related to heat medium. A controller is configured to perform a defrosting operation, a heating operation, a heat recovery defrosting operation mode, and a bypass defrosting operation that melts frost attached to the heat source side heat exchanger during the heating operation mode by passing a portion or all of the heat source side refrigerant through the bypass piping.

Abstract: An air-conditioning apparatus includes at least a use side heat medium flow control device and a heat medium flow switching device disposed in an outlet side of the heat medium passage of a use side heat exchanger, and a heat medium backflow prevention device disposed in an inlet side of the heat medium passage of a use side heat exchanger.

Abstract: To provide an air-conditioning apparatus that reduces large refrigerant noise generated when changing an operation mode. In an air-conditioning apparatus, when switching to a second operation mode from a first operation mode, switching to the second operation mode is performed after a predetermined time has elapsed after controlling either or all of expansion devices, controlling either or all of second flow switching devices, and controlling either or all of a first on-off device and a second on-off device such that a pressure difference of a heat source side refrigerant before and after each of the expansion devices is smaller compared to that in an operation state of the first operation mode.

Abstract: An air-conditioning apparatus including an outdoor unit having a compressor for compressing a refrigerant and a heat source side heat exchange for exchanging heat between the refrigerant and air, a plurality of indoor units having use side heat exchangers for exchanging heat between a heat transfer medium that flows therein and air, and relay unit disposed between the outdoor unit and the indoor units. The relay unit exchanges heat between the refrigerant conveyed from the outdoor unit and the heat transfer medium flowing in the indoor units. The relay unit includes a main relay unit that is connected to the outdoor unit with two pipes and a sub relay unit that is connect to the main relay unit with three pipes.

Abstract: An air-conditioning apparatus includes a refrigerant circuit having a plurality of expansion devices that controls a flow rate of the refrigerant flowing in each of a plurality of heat exchangers related to heat medium; a heat medium circuit having the heat exchangers related to heat medium and a use side heat exchanger that exchanges heat between the heat medium and air; heat medium flow switching devices disposed on an inflow side and an outflow side of the use side heat exchanger to mix or diverge the heat medium pertaining to the heat exchangers related to heat medium; and a controller that controls at least the heat medium flow switching device on the inflow side or the outflow side that controls the amount of heat exchange in each of the heat exchangers related to heat medium during cooling only operation mode or heating only operation mode.

Abstract: In a heat medium relay unit, a drain pan is configured to have width and depth dimensions larger than dimensions of an outer shell of a heat medium relay unit main body, the outer shell including side panels and, upper frames and, and lower frames and, and an upper end surface whose position is higher than those of upper end surfaces of the lower frames and.

Abstract: A refrigeration cycle is configured by connecting a compressor that compresses the refrigerant, a four-way valve that switches the circulation path of the refrigerant, a heat source side heat exchanger that exchanges heat, expansion valves that adjust the pressure of the refrigerant, and two or more intermediate heat exchangers that exchange heat between the refrigerant and the heat medium to heat and cool the heat medium, by piping. A heat medium circulation circuit is configured by connecting two or more intermediate heat exchangers, pumps that pressurize the heat medium, two or more use side heat exchangers that exchange heat between the heat medium and the air in the indoor space, and flow path switching valves that switch paths of the heated heat medium or the cooled heat medium to the use side heat exchangers, by piping.

Abstract: For each of a plurality of use-side heat exchangers, a plurality of heat medium flow switching devices respectively corresponding to the plurality of use-side heat exchangers are entirely or partially integrated, and the thus obtained integrated heat medium flow switching device is driven by a single driving device.

Abstract: In a case where frost is deposited a heat-source-side heat exchanger during a heating operation mode, an air-conditioning apparatus executes either a “heat recovery defrosting operation mode” using a heat capacity held in a heat medium or a “bypass defrosting operation mode” not using the heat capacity held in the heat medium.

Abstract: A multi-chamber air conditioner including a heat-source side refrigerant circuit in which a compressor, an outdoor heat exchanger, a first heat exchanger, a refrigerant flow-rate controller, and a second heat exchanger are connected in series, a first use-side refrigerant circuit in which the first heat exchanger and an indoor heat exchanger are connected in series, and a second use-side refrigerant circuit in which the second heat exchanger and the indoor heat exchanger are connected in series, and a heat-source side refrigerant circulating in the heat-source side refrigerant circuit and a use-side refrigerant circulating in the use-side refrigerant circuit are heat-exchanged in the first heat exchanger. The heat-source side refrigerant circulating in the heat-source side refrigerant circuit and the use-side refrigerant circulating in the use-side refrigerant circuit are heat-exchanged in the second heat exchanger.

Abstract: All of pumps are in operation for a predetermined period of time in an air-conditioning apparatus and, after that, the number of pumps in operation is changed depending on an operation capacity for indoor units each including a use side heat exchanger.

Abstract: An air-conditioning apparatus including, a first housing (an outdoor unit) that accommodates a compressor and a heat source side heat exchanger; a second housing (a heat medium relay unit) that accommodates a heat exchanger related to heat medium, an expansion device, and a pump; a third housing (a heat medium regulating unit) that accommodates a first heat medium flow switching device, a second heat medium flow switching device, and a heat medium flow control device; and a fourth housing (indoor unit) that accommodates a use side heat exchanger have separately different casings.

Abstract: When starting a cooling operation mode from a non-operating mode, the blower device of the indoor unit from which the start command is originated is operated. When starting a heating operation mode from a non-operating mode, the blower device of the indoor unit from which the start command is originated is operated after the heat medium temperature becomes equal to or greater than a preconfigured temperature.

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: Upon switching of an air-conditioning apparatus from an operation mode in which all of indoor units each including a use side heat exchanger are in non-operation to another operation mode in which at least one of the indoor units starts a cooling operation mode or a heating operation mode, a heat medium conveyed to the use side heat exchanger included in the indoor unit which has received a start instruction is cooled or heated to a predetermined temperature by a heat source side refrigerant, and after that, an air-sending device included in the indoor unit which starts the cooling operation mode or the heating operation mode is actuated.

Abstract: An air conditioning apparatus includes a refrigerant circuit in which a compressor for compressing heat source-side refrigerant, a first refrigerant channel switching device, a heat source side heat exchanger, an expansion device, and intermediate heat exchangers for performing heat exchange between the heat source-side refrigerant and a heat medium different from the heat source-side refrigerant are connected by pipes. Also, the air conditioning apparatus includes a heat medium circuit in which pumps for circulating the heat medium to be used for the heat exchange performed by the intermediate heat exchangers, a use-side heat exchanger, and channel switching devices for switching passages of the heat medium heated or cooled to the use-side heat exchanger are connected by pipes.

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: 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: An air-conditioning apparatus includes actuation control means including an actuation unit that sequentially opens heat medium flow switching devices or heat medium flow control devices on a one-by-one basis. The actuation control means performs control in such a manner that start time of driving of pumps is later than start of actuation of the heat medium flow switching devices and the heat medium flow control devices.