An electrode humidifier device having a cartridge and a reconfigurable steam nozzle, connected to the cartridge that may be changeable between a direct and a remote mounting. Fill and drain valves on a manifold may be operated to add or drain water, respectively, in the cartridge. A sensor may indicate a water level in the cartridge. A controller may be connected to the sensor, and the fill and drain valves. A steam output capacity of the cartridge may be maintained at a predetermined magnitude by controlling the level of water with a controller. The cartridge may have one or more handles for easily inserting or removing the cartridge in a housing. The manifold may be installed in the drain pan for easier cartridge replacement. The humidifier device may be directly mounted on an air duct of a heating system or can be installed remotely.

An air-conditioning system includes an air-conditioning apparatus including an outdoor unit storing outdoor-unit identification information an indoor unit storing indoor-unit identification information, and a remote controller including a third memory configured to store the outdoor-unit identification information and the indoor-unit identification information and a display unit configured to display error information when an abnormal condition occurs in the air-conditioning apparatus. The remote controller is configured to obtain the outdoor-unit identification information from the outdoor unit and to obtain the indoor-unit identification information from the indoor unit. The remote controller is configured to store the obtained outdoor-unit identification information and indoor-unit identification information into the third memory. The remote controller is configured to cause the display unit to display the stored outdoor-unit identification information and indoor-unit identification information together with the error information when an abnormal condition occurs in the air-conditioning apparatus.

Disclosed herein are related to a system, a method, and a non-transitory computer readable medium for operating an energy plant. In one aspect, a system determines schematic relationships of a plurality of heat, ventilation, and air conditioning (HVAC) devices of the energy plant based on connections of the plurality of HVAC devices. Each HVAC device is configured to operate according to a corresponding operating parameter. The system determines, from a plurality of HVAC devices, a reduced subset of the HVAC devices based on the schematic relationships. The system predicts thermodynamic states of the reduced subset. The system determines a set of operating parameters of the plurality of HVAC devices based on the thermodynamic states. The system operates the plurality of HVAC devices according to the set of operating parameters.

A leakage sensing apparatus for sensing refrigerant leakage from an air-conditioner in an air-conditioned space air-conditioned by the air-conditioner includes a leakage sensing unit configured to sense the refrigerant leakage, a communication unit configured to transmit notification information indicating that the leakage has been sensed to an external apparatus via a communication network in a case where the leakage sensing unit has sensed the refrigerant leakage, and a power source unit configured to supply power to the leakage sensing apparatus independently of ON/OFF of a power supply to the air-conditioner.

Disclosed is an inline flow control system with parallel flow solenoid valves. In particular, in certain embodiments, the flow control system includes a flow control device with switch ports in electrical communication with a high float switch and a low float switch. The flow control device includes a first solenoid valve to control fluid flow through a first fluid pipe based on the high float switch, and a second solenoid valve to control fluid flow through a second fluid pipe based on the low float switch. In certain embodiments, the flow control system includes a manual bypass valve for a third fluid pipe. The fluid pipes are in parallel flow. In certain embodiments, the flow control system is devoid of an electronic controller. Accordingly, the inline flow control system can be retrofitted for existing flow systems with minimal cost and effort.

A building HVAC control system is provided, including at least one wireless mesh network. The wireless mesh network includes a plurality of wireless mesh nodes, the wireless mesh nodes include: at least one sensing node, configured to communicate with sensors installed in a building and obtain measured environment data collected by the sensors; at least one control node, configured to communicate with HVAC equipment, and send control commands to the HVAC equipment; at least one router node, configured to transmit data between the wireless mesh nodes, and transmit data between the wireless mesh nodes and the router. The wireless mesh nodes can perform device-to-device communications by transmitting and receiving wireless signals through the mesh without passing through the server, thereby enabling efficient, multi-node control loops that add no additional computational load to the server while increasing the safety of data transmission and the overall reliability of the HVAC control system.

A heating, ventilation, and/or air conditioning (HVAC) system including a baffle disposed vertically adjacent to a heat exchanger, and a method for controlling the flow of a refrigerant leak are provided. The baffle may direct at least a portion of a refrigerant leak toward a refrigerant detection assembly. The refrigerant detection assembly may include a nondispersive infrared (NDIR) sensor. The baffle may include a fishbone configuration or a helical configuration. The baffle may direct substantially all of the refrigerant leak away from a control box, which may include at least one potential ignition source (e.g., an electrical component, such as a contactor). When the heating, ventilation, and/or air conditioning (HVAC) system utilizes a flammable refrigerant, the baffle may help mitigate potential ignition of the flammable refrigerant.

A heating, ventilation, and/or air conditioning (HVAC) system includes a compressor, a fan, an inverter configured to drive operation of the compressor, and a controller communicatively coupled to the fan and the inverter. The controller includes a tangible, non-transitory, computer-readable medium with computer-executable instructions that, when executed by processor circuitry, are configured to cause the processor circuitry to determine an operating parameter of the fan in response to an interruption in receiving communication signals from the inverter and operate the fan based on the operating parameter during the interruption.

A self-orienting sensing system for a heating, ventilation, and air conditioning (HVAC) system includes a housing having a main body. The housing defines a sensing aperture in a first portion of the main body and a mounting channel in a second portion of the main body. The self-orienting sensing system includes a sensing element retained within the housing. The sensing element is configured to detect leaked refrigerant that enters the housing via the sensing aperture. The self-orienting sensing system also includes a mounting retainer configured to extend through the mounting channel and couple the housing to an interior surface of an air handling enclosure of the HVAC system. The mounting retainer enables the mounting channel to rotate about the mounting retainer to automatically align the sensing aperture in a target sensing orientation based on a weight of the housing under the force of gravity.

A heating, ventilation, and air-conditioning (HVAC) system includes a first control unit and a second control unit. The first control unit is communicatively coupled to a first plurality of HVAC units, a first interactive display, and a first plurality of wireless sensors using a Wi-Fi direct protocol. The second control unit is communicatively coupled to a second plurality of HVAC units, a second interactive display, and a second plurality of wireless sensors over a Wi-Fi network. The first control unit is operable to connect to the second control unit using the Wi-Fi direct protocol. Upon connecting to the second control unit, the first control unit switches communications with the first plurality of HVAC units, the first interactive display, and the first plurality of wireless sensors from the Wi-Fi direct protocol to the Wi-Fi network.