A system and a method for defrosting/de-icing an air-conditioner are provided, the system comprising: a 3D depth sensor disposed inside an air-conditioner outdoor unit casing, for acquiring information regarding outer diameters of pipes of an outdoor heat exchanger, distances between the pipes, and distances between the respective pipes and an air-conditioner outdoor unit casing side plate; and a controller connected to the 3D depth sensor, for receiving the information acquired by the 3D depth sensor and controlling the air conditioner to enter or exit a defrosting-deicing mode. The system and method for defrosting/de-icing an air-conditioner provided by the present disclosure can effectively and timely perform defrost/de-ice operation on the outdoor heat exchanger to prevent freezing; besides, it can prevent the impact on the air-conditioner's heating function to the utmost extent so as to significantly improve user experience.

A system for remote diagnostic analysis of a heating, ventilation and air condition (HVAC) system is provided. The system includes a thermostat in operable communication with at least one peripheral component of the HVAC system and configured to receive information relating to the at least one peripheral component, and a server in operable communication with the thermostat for receiving and analyzing the information. The server causes the at least one peripheral component to conduct a diagnostic test and analyzes the test result to perform a root cause analysis of a system malfunction.

An air-conditioning device includes: a main circuit in which a refrigerant circulates; a flow channel-switching unit configured to select a certain parallel heat exchanger as a defrosting target; a bypass pipe; a temperature-detecting unit; an operation control unit configured to operate the flow channel-switching unit such that an operation mode is switched between a normal heating operation mode in which the plurality of parallel heat exchangers serve as evaporators and a defrosting heating operation mode in which one parallel heat exchanger is selected as the defrosting target to cause part of the refrigerant to flow thereinto via the bypass pipe and the other parallel heat exchangers serves as an evaporator; and an erroneous installation-sensing unit configured to sense erroneous installation of an installed component based on a magnitude relationship between the detected temperatures in the plurality of parallel heat exchangers detected by the temperature-detecting unit.

A load control device for improving energy efficiency of a heating, ventilating, and air-conditioning (HVAC) system by controlling shed times of a compressor of the HVAC system. The load control device includes a compressor cutoff switch, a sensing circuit, and a processor. The processor determines a subsequent mandatory shed time based upon a previous shed time, a previous run time, and a minimum run time. A subsequent mandatory shed longer than the previous mandatory shed time causes a subsequent run time to be increased, thereby increasing system efficiency.

A variable air volume controller includes a communications interface and a processing circuit. The communications interface is configured to facilitate communication with an external device and building equipment. The processing circuit is configured to store a plurality of predefined, selectable-applications; receive a selection of one of the plurality of predefined, selectable-applications; and implement the selected application such that the building equipment is controlled according to the selected application.

An air conditioning system, including a compressor, two outdoor heat exchange units, a liquid pipe used for communicating with indoor units, a high-pressure gas tube and a low-pressure gas tube; the air conditioning system further includes a valve assembly. One outdoor heat exchange unit has a first state in which one end thereof communicates with the high-pressure gas tube and another end thereof communicates with the liquid pipe, and has a second state in which one end thereof communicates with the low-pressure gas tube and the other end thereof communicates with the liquid pipe. Further disclosed is a control method for the air conditioning system.

Provided is an air conditioning visualization system including an image capturing unit to capture an image, an air conditioner setting acquisition unit to specify at least one air conditioner exerting an influence on a space included in the captured image from a plurality of air conditioners and to acquire the operation setting of this at least one air conditioner, and a display unit to display a visualization image obtained by visualizing the influence exerted on the space by this at least one air conditioner.

The present invention relates to a steam generator comprising: a steam housing which forms the exterior and has a space in which water is stored; a steam heater disposed inside the steam housing and generating heat by means of an applied power; a water pipe disposed on one side of the peripheral surface of the steam housing and having a communication hole through which water is introduced from the outside into the steam housing or water inside the steam housing is discharged to the outside; an air inlet part disposed on the upper surface of the steam housing and having an air inlet through which air is introduced into the steam housing; a steam outlet part disposed on the upper surface of the steam housing apart from the air inlet part by a predetermined distance and having a steam outlet through which steam generated inside the steam housing and the air introduced through the air inlet part are discharged to the outside.

Internal control devices (41A to 41D) included respectively in air conditioners (10A to 10D) in an air conditioning system (1) are communicably connected one by one correspondingly to external control devices (42A to 42D). Each of the external control devices (42A to 42D) is configured to execute command generating operation of generating an operation command to a corresponding one of the air conditioners (10A to 10D). The external control devices (42A to 42D) constitute an external control system (50). In the external control system (50), one of the external control devices (42A) functions as a master control device configured to execute the command generating operation whereas remaining ones of the external control devices (42A to 42D) other than the external control device (42A) functioning as the master control device function as sub control devices configured not to execute the command generating operation.

An indoor comfort control system for controlling an indoor comfort system includes a microprocessor, a display, wireless transceiver and a specialized control system computer program. The control is accessible over the Internet via the transceiver. The control is diagnosed and configured by a third-party operating a third-party communication device. The control communicates with the third-party communication device over the Internet. The multi-party access is granted by a principal of the control, and communicated to the third-party communication device by a cloud server system. The control receives connection requests and commands from the third-party communication device over the Internet. The control further communicates responses to the third-party communication device over the Internet. The connection can be timed out based on an access time limit set by the principal. The date and time of the multi-party access is configured by the principal via the principal communication device and the cloud server system.