Abstract: A refrigerating system including an air conditioning system and a cooler system is provided. An air conditioner-side refrigerant passage may be connected to a cooler-side refrigerant passage to allow refrigerant to flow between the air conditioning system and the cooler system. Thus, if a cooler-side compressor experiences abnormal operation, cooler-side refrigerant may be compressed by an air conditioner-side compressor so as to maintain cooling performance of the refrigerating system.

Abstract: An air conditioning system includes a compressor, an outdoor heat exchanger that discharges evaporated refrigerant, and a first pipe coupling the outdoor heat exchanger and the compressor, where the first pipe allows the outdoor heat exchanger to receive at least a portion of the compressed refrigerant from the compressor.

Abstract: An air conditioner is provided, in which some of a plurality of outdoor heat exchangers implement a defrosting operation and others implement a heating operation. The air conditioner includes a compressor to compress refrigerant, a hot gas pipe to which a part of the refrigerant compressed in the compressor is moved, a 4-way valve to which the remaining refrigerant compressed in the compressor is moved, an indoor heat exchanger in which the refrigerant, having passed through the 4-way valve, undergoes heat exchange with indoor air, and a plurality of outdoor heat exchangers, some of which implement a heating operation as the heat-exchanged refrigerant from the indoor heat exchanger is moved therethrough while others implement a defrosting operation as the refrigerant having passed through the hot gas pipe is moved therethrough.

Abstract: An air conditioner and a method for controlling the air conditioner are provided. The air conditioner may include an air-conditioning device having a variety of components that provide air-conditioning of an indoor space, an input device that receives signals to manipulate the air-conditioning device and signals to select a sleep mode, and a controller that, when the input device receives a signal to select the sleep mode, controls the air-conditioning device to perform a rapid eye movement sleep operation at least one time to air-condition the indoor space at a temperature higher than a temperature that is set in accordance with the sleep mode.

Abstract: An air conditioner includes a compressor, a first heat exchanger, and a first pipe configured to allow refrigerant to flow from the first heat exchanger. A bypass pipe is branched off from the first pipe and is configured to expand refrigerant flowing through the bypass pipe. A second heat exchanger is configured to allow the expanded refrigerant of the bypass pipe to heat-exchange with the refrigerant flowing along the first pipe. A second pipe couples the second heat exchanger to the compressor so that the refrigerant expanded by the bypass pipe and heat-exchanged at the second heat exchanger can be introduced into the compressor.

Abstract: An air conditioner and a method for controlling an air conditioner are provided. The air conditioner includes an air-conditioning device that air-conditions an indoor space, a lighting device that illuminates the indoor space, an input device that receives signals to operate the air-conditioning device and for selecting a sleep mode, and a controller that controls the lighting device and the air-conditioning device. When the input device receives the signal for selecting the sleep mode, the lighting device is controlled to sequentially perform a sleep entry operation in which the indoor space is illuminated to have a predetermined luminance and color temperature for a predetermined time, a sleep operation in which the indoor space is illuminated to have a predetermined luminance and color temperature until a wakeup time, and a wakeup operation in which the indoor space is illuminated to have a predetermined luminance and color temperature.

Abstract: A combined refrigerating/freezing and air conditioning system is provided. The system may include an air conditioning circuit, a refrigerating circuit, a freezing circuit, a first heat exchanger, and a second heat exchanger. The air conditioning circuit may include a compressor, an outdoor heat exchanger, and an indoor heat exchanger. The refrigerating circuit may include compressor, a condenser, and an evaporator. The freezing circuit may include a compressor, a condenser, and an evaporator. The refrigerant of the air conditioning circuit may be heat-exchanged with the refrigerant of the refrigerating circuit in the first heat exchanger, and the refrigerant of the refrigerating circuit may be heat-exchanged with the refrigerant of the freezing circuit in the second heat exchanger to improve air conditioning efficiency and refrigerating/freezing efficiency of the system.

Abstract: An air conditioning system including an outdoor heat-exchanging unit, at least one indoor heat-exchanging unit, a gaseous refrigerant line connected between the outdoor heat-exchanging unit and the indoor heat-exchanging unit, to allow a refrigerant in a gaseous state to flow between the outdoor heat-exchanging unit and the indoor heat-exchanging unit, and a pressure compensation device for increasing a pressure of the gaseous refrigerant flowing through the gaseous refrigerant line. The pressure compensation device is located along the gaseous refrigerant line at a position closer to the indoor heat-exchanging unit than to the outdoor heat-exchanging unit. A pressure compensation device for use in an air conditioning system is also provided.

Abstract: A heat pump capable of performing heating and cooling simultaneously is provided. The heat pump includes a compressor, indoor devices that heat or cool an indoor space, outdoor heat exchangers, and switching devices. The outdoor heat exchangers are configured to individually operate as a condenser or an evaporator depending on a ratio of heating to cooling of the indoor devices. When an operation mode is changed, continuous heating and cooling is performed without stopping the system.

Abstract: An air conditioner including an indoor heat exchange unit to perform a heat exchange process by the supply and absorption of heat through the circulation of a first refrigerant, at least one outdoor heat exchange unit to perform a heat exchange process by the absorption and supply of heat through the circulation of a second refrigerant, and an intermediate connection unit to perform a heat exchange between the first refrigerant and the second refrigerant.

Abstract: A combined refrigerating/freezing and air conditioning system is provided. The system may include an air conditioning circuit, a refrigerating circuit, a freezing circuit, a first heat exchanger, and a second heat exchanger. The air conditioning circuit may include a compressor, an outdoor heat exchanger, and an indoor heat exchanger. The refrigerating circuit may include compressor, a condenser, and an evaporator. The freezing circuit may include a compressor, a condenser, and an evaporator. The refrigerant of the air conditioning circuit may be heat-exchanged with the refrigerant of the refrigerating circuit in the first heat exchanger, and the refrigerant of the refrigerating circuit may be heat-exchanged with the refrigerant of the freezing circuit in the second heat exchanger to improve air conditioning efficiency and refrigerating/freezing efficiency of the system.

Abstract: A refrigerating system including an air conditioning system and a cooler system is provided. An air conditioner-side refrigerant passage may be connected to a cooler-side refrigerant passage to allow refrigerant to flow between the air conditioning system and the cooler system. Thus, if a cooler-side compressor experiences abnormal operation, cooler-side refrigerant may be compressed by an air conditioner-side compressor so as to maintain cooling performance of the refrigerating system.

Abstract: A method for detecting a clogged state of a pipe of a heat pump type multi-air conditioner includes: detecting a temperature of a pipe of an arbitrary indoor heat exchanger among a plurality of indoor heat exchangers; detecting a pressure of a refrigerant sucked into an arbitrary outdoor unit among a plurality of outdoor units in case of performing an air-conditioning operation, and detecting a pressure of a refrigerant introduced into the arbitrary indoor heat exchanger after being discharged from an arbitrary outdoor unit among the plurality of outdoor units in case of performing a heating operation; and comparing a pressure corresponding to the detected temperature of the pipe and the detected pressure of the refrigerant and determining whether the pipe is clogged based on the comparison result. By detecting a clogged state of a pipe, the heat pump type multi-air conditioner is prevented from being damaged due to a clogged state of the pipe.

Abstract: A compression system for an air conditioning system includes first and second compressors. The first compressor includes a first compression chamber in which a fluid introduced from an outside of the first compressor is compressed, and a first case defining a first space into which the fluid compressed in the first compression chamber is introduced. The second compressor includes a second case defining a second space into which the fluid compressed in the first compressor is introduced, and a second compression chamber in which the fluid introduced from the second space is compressed. The second compressor operates independently of the first compressor, and a connecting line connects the first and second compressors.

Abstract: An air conditioner includes a compressor, a first heat exchanger, and a first pipe configured to allow refrigerant to flow from the first heat exchanger. A bypass pipe is branched off from the first pipe and is configured to expand refrigerant flowing through the bypass pipe. A second heat exchanger is configured to allow the expanded refrigerant of the bypass pipe to heat-exchange with the refrigerant flowing along the first pipe. A second pipe couples the second heat exchanger to the compressor so that the refrigerant expanded by the bypass pipe and heat-exchanged at the second heat exchanger can be introduced into the compressor.

Abstract: An air conditioner includes a plurality of compressors, a common intake pipe, and a plurality of oil equalizing pipes that connect the compressors to the common intake pipe such that oil existing above a reference oil level in the compressors can be transferred to the common intake pipe. An oil equalizing valve provided on at least two of the oil equalizing pipes controls oil flowing through the oil equalizing pipes, where at least two of the oil equalizing valves can be opened together during performance of oil equalizing operation such that amounts of the oil in at least two compressors can be equalized.

Abstract: An air conditioner and a method for controlling the air conditioner are provided. The air conditioner may include an air-conditioning device having a variety of components that provide air-conditioning of an indoor space, an input device that receives signals to manipulate the air-conditioning device and signals to select a sleep mode, and a controller that, when the input device receives a signal to select the sleep mode, controls the air-conditioning device to perform a rapid eye movement sleep operation at least one time to air-condition the indoor space at a temperature higher than a temperature that is set in accordance with the sleep mode.

Abstract: An air conditioner and a method for controlling an air conditioner are provided. The air conditioner includes an air-conditioning device that air-conditions an indoor space, a lighting device that illuminates the indoor space, an input device that receives signals to operate the air-conditioning device and for selecting a sleep mode, and a controller that controls the lighting device and the air-conditioning device. When the input device receives the signal for selecting the sleep mode, the lighting device is controlled to sequentially perform a sleep entry operation in which the indoor space is illuminated to have a predetermined luminance and color temperature for a predetermined time, a sleep operation in which the indoor space is illuminated to have a predetermined luminance and color temperature until a wakeup time, and a wakeup operation in which the indoor space is illuminated to have a predetermined luminance and color temperature.

Abstract: An air conditioner is provided, in which some of a plurality of outdoor heat exchangers implement a defrosting operation and others implement a heating operation. The air conditioner includes a compressor to compress refrigerant, a hot gas pipe to which a part of the refrigerant compressed in the compressor is moved, a 4-way valve to which the remaining refrigerant compressed in the compressor is moved, an indoor heat exchanger in which the refrigerant, having passed through the 4-way valve, undergoes heat exchange with indoor air, and a plurality of outdoor heat exchangers, some of which implement a heating operation as the heat-exchanged refrigerant from the indoor heat exchanger is moved therethrough while others implement a defrosting operation as the refrigerant having passed through the hot gas pipe is moved therethrough.

Abstract: An apparatus and method for monitoring state information in a trial run mode of a multi-airconditioning system in which a plurality of indoor units are controlled by only one outdoor unit is disclosed. The apparatus and method connects a dedicated controller to the outdoor unit in a trial run mode of the multi-airconditioning system, such that it controls the indoor units and monitors state information of the indoor and outdoor units. The apparatus includes a trial-run-mode controller and a control input & state display unit. The trial-run-mode controller connected to the outdoor unit includes a trial-run-mode program for automatically detecting poor installation of the multi-airconditioning system.