An air treatment device includes a casing, a drain pan provided in the casing, a camera configured to capture an inner surface of the drain pan to obtain image data, and a lighting device configured to apply, to a photographing target of the camera, visible light having a maximum peak wavelength in a wavelength band from 400 nm to 500 nm.

The present disclosure describes a supply fan assembly including a controller, a memory operably coupled with the controller. The supply fan assembly further includes at least one environment sensor operably coupled with the controller and a fan supplying fresh air from an exterior environment into a structure according to instructions from the controller. Additionally, the operational data is generated by the at least one of the environment sensor and the controller, and the controller instructs the fan in response to the operational data generated during a pre-defined time period.

An air conditioner includes a heat exchanger provided in an indoor unit, a drain pan that receives drain water generated in the heat exchanger, an irradiation unit that irradiates the drain pan with ultraviolet rays, and a control unit that controls ultraviolet intensity of the irradiation unit. The control unit controls the irradiation unit to make the ultraviolet intensity after a cooling operation is larger than the ultraviolet intensity during the cooling operation.

A dehumidifier without a condensate tank is provided. The dehumidifier may include a housing, one or more outlets, and no condensate tank. The dehumidifier may be positioned directly above a floor drain and/or a drain within a utility sink during operation. The dehumidifier may include a pump. The dehumidifier may include one or more sensors.

An HVAC system includes an evaporator. The evaporator includes a sensor configured to measure a property value (i.e., a saturated suction temperature or a saturated suction pressure) associated with saturated refrigerant flowing through the evaporator. The system includes a variable-speed compressor configured to receive the refrigerant and compress the received refrigerant. The system includes a controller communicatively coupled to the sensor and the variable-speed compressor. The controller monitors the property value measured by the sensor and detects a system fault, based on the monitored property value. In response to detecting the system fault, the controller operates the compressor in a freeze-prevention mode, which is configured to maintain the property value above a setpoint value by adjusting a speed of the variable-speed compressor. This prevents or delays freezing of the evaporator during operation of the system during the detected system fault.

Controlling heating and cooling in a conditioned space utilizes a fluid circulating in a thermally conductive structure in fluid connection with a hydronic-to-air heat exchanger and a ground heat exchanger. Air is moved past the hydronic-to-air heat exchanger, the air having fresh air supply and stale air exhaust. Sensors located throughout the conditioned space send data to a controller. User input to the controller sets the desired set point temperature and humidity. Based upon the set point temperature and humidity and sensor data, the controller sends signals to various devices to manipulate the flow of the fluid and the air in order to achieve the desired set point temperature and humidity in the conditioned space. The temperature of the fluid is kept less than the dew point at the hydronic-to-air heat exchanger and the temperature of the fluid is kept greater than the dew point at the thermally conductive structure.

The electrical connections of a chamber or enclosure for a water tub can be protected through the use of spill element sensors. The spill element sensors can help to disable the delivery of power to the heater of a water tub in the event that the electrical connections become wet.

When an outdoor air handler performs a heating humidifying operation and an air conditioner performs a cooling operation, a control device adjusts at least one of a to-be-supplied air temperature of the outdoor air handler, a to-be-supplied air flow rate of the outdoor air handler, a to-be-supplied water flow rate of the outdoor air handler, and a cooling temperature that is a temperature at an air heat exchanger of the air conditioner. The control device adjusts the to-be-supplied air temperature and the cooling temperature on the basis of dehumidification information, operation information, temperature information, and humidity information. The operation information is information regarding an operating state of the air conditioner.

A damper control assembly includes a damper body movable between a first threshold position and a second threshold position. A motor is operably connected to the damper body, wherein the motor drives the damper between the first threshold position to determine an open position and the second threshold position to determine a closed position. A controller is operably connected to the motor and has a stall detection module that detects a first rotor-lock condition when the motor drives the damper body to the first threshold position and a second rotor-lock condition when the motor drives the damper body to the second threshold position. The controller includes a memory module for storing the first and second threshold positions for use by the controller. The damper control assembly is calibrated to drive the damper body within an operating range having the open and closed positions and that is less extensive than a mechanical range defined by the first and second threshold positions.

One aspect, as provided herein, is directed to a multi-stage fluid control system for a fluid source heat pump system. This embodiment comprises compressors configured to operate as separate, heat exchange stages, condensers each being fluidly coupled to at least one of the compressors by refrigerant tubing and having intake ends coupled together by a fluid intake manifold. This embodiment further includes output conduits coupled to each of the condensers and that are couplable to a distal location. Further included is a modulating valve control system interposed the output conduits. The modulating valve control system is configured to stage a flow of fluid through the condensers based on a number of operating compressors.