A Fluid Flow Control System (FFCS) door assembly includes a continuous belt and a plurality of rollers. The plurality of rollers support the continuous belt and define a first segment, a second segment, a third segment, and a fourth segment. The continuous belt includes a plurality of openings that selectively allow fluid flow to pass through the first segment, the second segment, the third segment, and the fourth segment when two openings of the plurality of openings align with the first segment, the second segment, the third segment, or the fourth segment.

A network of wireless remote climate sensors in a heating, ventilation, and air conditioning (HVAC) system permits the creation of personalized microclimates within an enclosed space. In addition to collecting temperature and humidity data, the wireless remote climate sensors can detect whether the enclosed space is occupied by a human. Human detection is made possible by optional cameras, microphones, and gas sensors on the wireless remote climate sensors. As the human moves throughout the enclosed space, the HVAC system is able to track the human's movement using the wireless remote climate sensors. The HVAC system may adjust airflow to different portions of the enclosed space based on the human's location. The result is an efficient use of system resources to keep users at their ideal temperature.

A damper assembly in a heat recovery ventilator, comprising a rotor, a bearing, drive means, and sealing means. The rotor rotates about an axis of rotation and includes a pair of end walls in spaced-apart relation to define a substantially open periphery. The rotor also includes an air-deflecting member connected between the end walls. The bearing is associated with one of the end walls and is located at the axis of rotation, to support rotation of the rotor. The drive means rotates the rotor about the axis of rotation and positions the air-deflecting member in first and second orientations. The sealing means is in slide contact engagement with the rotor and seals between the rotor and a surrounding damper compartment of the ventilator. The sealing means isolates the exhaust airstream from the supply airstream in the damper compartment while the air-deflecting member is in the first or the second orientation.

Systems, apparatus and methods for operating an environmental control system that delivers dehumidified outdoor air into a conditioned space through an air valve. The method includes establishing CO.sub.2 setpoints corresponding to a ventilation outdoor air flow rate and a dehumidification outdoor air flow rate, determining a humidity metric of the conditioned space, and delivering outside air to the conditioned space at the ventilation outdoor air flow rate or dehumidification outdoor air flow rate based upon the humidity metric. The outside air may be tempered with return air from the conditioned space. The dehumidification CO.sub.2 set point is determined by predicting the dehumidification CO.sub.2 set point based on the airflow quantity per occupant and the relationship of the occupant predicted water vapor emission rate and CO.sub.2 emission rate.

A movable media air handling unit includes cooling media panels that may be moved into or out of an airflow based on whether or not additional cooling is required from the movable cooling media panels. Moving the cooing media panels out of the air flow reduces flow restrictions/pressure drop through the movable media air handling unit. In some embodiments, various types of movable cooling media panels may be used, such as liquid coolant coil panels, gaseous coolant coil panels, evaporative cooling panels, or other types of panels.

A system for controlling airflow in a plenum, that comprises a worm gear and planetary gear that are removably coupled to a worm shaft and planetary shaft, respectively. The planetary shaft controls the movement of a damper between an open position permitting maximum airflow through the plenum, and a closed position restricting airflow through the plenum. A motor or gear-motor is positioned at the plenum for driving the worm shaft. The motor is controlled by a remotely located controller that includes a power supply for operating the motor and that has a display providing a continuous indication of the position of the damper between the open and closed positions. The controller is connected to the motor through a cable with a detachable electrical connection between the cable and the controller, such as a jack and plug. A wall plate for housing the electrical connection is mounted on a wall or other structure. The wall plate has a first plate for housing the jack and a second plate with a flexible flange for removably securing the jack in the housing by snap fit insertion.

An HVAC actuator configured to actuate an HVAC component may include a rotatable output shaft having a full range of rotation between a first end position and a second end position, a drive mechanism configured to selectively drive the output shaft, and a housing having a front side that faces away from the HVAC component. The HVAC actuator may include a range adjustment lever manipulatable from the front side of the housing that allows a user to selectively limit rotation of the output shaft to a reduced range that is a subset of the full range. In some instances, the range adjustment lever allows the user to select between two or more predetermined reduced ranges. The two or more predetermined reduced ranges may each include the first end position but have a different second stop position, or include the second end position but have a different first stop position.

A method for calibrating a product valve disposed along a flow path in a duct, with a calibration valve in a duct remote from the product valve and having a geometric shape and operational parameters corresponding to those of the product valve. A calibration controller establishes calibration conditions and, in responsive thereto, generates a calibration flow rate (CFM) function by measuring for the calibration valve, a sparse set of flow rates and determining a surface-fit mathematical representation of fluid flow through the calibration valve over applied calibrated flow rates and the measured pressure drops. The CFM Function is transferred to a product blade controller, which in turn, processes the representation of the mathematical surface, and controls fluid flow through product valve based on values extracted from the received CFM Function as well as at least one parameter control signal indicative of a desired set point.

According to certain embodiments, a thermostat is configured for use in a climate control system. The thermostat is operable to use two-way communication for communicating operational information between the thermostat and at least one rooftop unit (RTU) within the climate control system. For example, the two-way communication comprises sending first operational information to the RTU and receiving second operational information from the RTU. The operational information comprising one or more climate control commands, setpoints, configuration information, diagnostics, and/or sensor data. The thermostat is further operable to operate the climate control system based on the operational information communicated between the thermostat and the RTU.

A heating, ventilation, and air conditioning (HVAC) system includes a reheat valve configured to receive a refrigerant flow and regulate division of the refrigerant flow provided to a reheat coil and a condenser. The HVAC system also includes a condenser fan configured to draw a flow of outdoor air across the condenser and a controller communicatively coupled to the reheat valve and the condenser fan. The controller is configured to monitor a position of the reheat valve and to control operation of the condenser fan based on a correspondence between the position of the reheat valve and a threshold degree of opening.