Provided is a refrigerant cycle apparatus capable of suppressing detects caused by iodine even when a refrigerant containing iodine is used. An air conditioner includes a refrigerant circuit through which a refrigerant containing iodine circulates. The refrigerant circuit includes a component that is in contact with a refrigerant containing iodine, the component being made of metal other than aluminum or an aluminum alloy, or having a content of aluminum which is equal to or less than a ratio at which corrosion of aluminum occurs by iodine. The component is at least one of a component of a compressor, a component of a heat-source-side heat exchanger or a utilization-side heat exchanger, a component of an expansion valve, a drier, and a connection pipe.

Embodiments of the present disclosure are directed to an interface for a fan that includes a first bracket coupled to the fan, where the fan is configured to direct a flow of air through an opening of a duct, and the opening comprises a central axis extending therethrough, a second bracket coupled to a frame surrounding the opening of the duct, where the first bracket and the second bracket are configured to surround the opening of the duct, the second bracket is configured to support the first bracket, and the second bracket is partially radially within the first bracket relative to the central axis of the opening, and a gasket disposed between the first bracket and the second bracket, where the first bracket, the second bracket, and the gasket are configured to sealingly engage with one another without mechanical securement.

An air-conditioning apparatus includes a compressor and an outdoor heat exchanger that operates as an evaporator. A first heat exchange unit of the outdoor heat exchanger includes: first heat transfer tubes extending in an upward/downward direction, and arranged apart from each other in a lateral direction; a first junction pipe extending in the lateral direction, and connected to the lower ends of the first heat transfer tubes; an outflow pipe connected to the first junction pipe at or below a center position of the first junction pipe in the upward/downward direction; second heat transfer tubes extending in the upward/downward direction, and arranged apart from each other in the lateral direction; a first distribution pipe extending in the lateral direction, and connected to the lower ends of the second heat transfer tubes, and a first connection part connecting upper ends of the first heat transfer tubes and upper ends of the second heat transfer tubes.

A curb assembly for a heating, ventilation, and/or air conditioning (HVAC) system includes a frame configured to couple to a curb of a structure, a pedestal system configured to couple to a housing of the HVAC system and to the frame, such that the pedestal system extends from the housing to the frame, and an adjustable duct connector configured to fluidly couple an air flow passage of the housing with ductwork of the structure. The pedestal system is configured to enclose a space formed between the frame and the housing and the adjustable duct connector configured to be disposed within the space.

A curb assembly for a heating, ventilation, and/or air conditioning (HVAC) system includes a frame configured to couple to a curb of a structure, a pedestal system configured to couple to a housing of the HVAC system and to the frame, such that the pedestal system extends from the housing to the frame, and an adjustable duct connector configured to fluidly couple an air flow passage of the housing with ductwork of the structure. The pedestal system is configured to enclose a space formed between the frame and the housing and the adjustable duct connector configured to be disposed within the space.

A system for fault detection and diagnostics of equipment. The system may also be capable of disaggregation and/or virtual submetering of energy consumption by equipment, such as that of heating, ventilation and air conditioning, lighting, and so forth, in a building. Vibration and current sensors, along with one or more algorithms, may be utilized for fault detection and diagnostics of equipment. Models may be developed to aid in deducing energy consumption of individual components of equipment, and the like, for a building.

The present disclosure relates to a heating, ventilating, and air conditioning (HVAC) unit configured to supply conditioned air to a conditioned space. The HVAC unit includes a first exhaust fan capable of operating at variable speeds and a second constant-speed fan. The HVAC unit also includes a controller configured to determine a target airflow to be provided to the conditioned space, cause actuation of the first exhaust fan at a variable fan speed when the target airflow is greater than zero, and cause actuation of the second exhaust fan when the target airflow is greater than an airflow threshold.

An access panel assembly and a heating, ventilation, and/or air conditioning (HVAC) system incorporating the access panel assembly are provided. The HVAC system includes a heat exchanger assembly with a first heat exchanger coil and a second heat exchanger coil (e.g., in a V-shaped configuration). The first heat exchanger coil and the second heat exchanger coil each respectively include an exterior surface, an interior surface, a first edge, and a second edge. The access panel assembly is adjacent to the first edge of the first heat exchanger coil and the first edge of the second heat exchanger coil. The access panel assembly is configured to provide access (e.g., for cleaning and/or maintenance) to at least one of: the interior surface of the first heat exchanger coil and the interior surface of the second heat exchanger coil.

A system for passively exhausting air from a structure includes at least one pair of modules arranged on a roof of the structure. Each module has an exhaust face on one side and a sloped surface on the opposite side, and can receive exhaust air that flows upward from inside the structure. The modules can be arranged in pairs facing one another, with one of the sloped surfaces facing a direction of an environmental flow of air, so that the environmental air can flow up the sloped surface of one module and down the sloped surface of the other module without impinging on the exhaust faces of either module. The pairs can also be arranged side-by-side in an array, which can be expanded with additional pairs of modules to exhaust from the structure at a greater rate.

A multifunction adaptive whole house fan system can include a whole house fan to pull large volume of air through a building structure. The whole house fan can pull air from a window or damper into the building structure and expel air through an attic. The system can monitor the environment to operate the whole house fan when desired conditions are present in coordination with other systems of the building structure to reduce overall energy consumption.