An HVAC system is described having components of a variable refrigerant flow (VRF) outdoor compressor unit connected to an indoor fan coil unit. The indoor fan coil unit supplies air to ducts that condition a plurality of zones. Each zone has a volume modulating air damper that can maintain a predetermined volume of air flowing through it. As the dampers for some zones vary between open and close positions, the air pressure in the ducts changes. The volume modulating dampers compensate for these pressure changes, ensuring that only the predetermine volume of air is passing into the zones. By regulating the volume of into each zone, the volume modulating air dampers can restrict the air volume through the fan coil causing the outdoor unit to reduce compressor speed, thereby saving energy.

Configuration of flow paths for the output (e.g., chilled or heated air) of an HVAC system is described. In one embodiment, a demand response message can be received from a resource provider requesting that the HVAC system increase or decrease consumption of the resource. If the request is satisfied, then the output from the HVAC device will be increased or decreased resulting in potential discomfort for occupants. This output, however, rather than being distributed in a uniform manner, can instead be distributed, via ventilation elements of the HVAC system in a non-uniform way according to the flow paths. The flow paths can be determined to direct sufficient output to high priority zones in order to, e.g., satisfy a comfort level in the high priority zones.

A zoning system for a heating, ventilation, and/or air conditioning (HVAC) system includes a temperature control device configured to monitor a temperature in a zone of a structure for conditioning by the HVAC system and configured to send a wireless control signal including data based on the temperature, and a damper actuator configured to be associated with the zone and configured to adjust a position of a damper to control an airflow into the zone, where the damper actuator is configured to receive the wireless control signal from the temperature control device and configured to adjust the position of the damper based on the data.

An HVAC system includes an evaporator coil disposed between a supply air duct and a return air duct. A re-circulation duct fluidly couples the supply air duct and the return air duct. A damper is disposed in the re-circulation duct and is moveable between an open position and a closed position. A controller is operatively coupled to a variable-speed compressor, a variable-speed circulation fan, and the damper. Responsive to a determination that the variable-speed circulation fan is operating at the minimum speed and the suction pressure is above the pre-determined threshold, the controller signals the damper to move to the open position. Responsive to a determination that the variable-speed circulation fan is not operating at the minimum speed or the suction pressure is below the pre-determined threshold, the controller signals the damper to move to the closed position.

A method includes generating, by a processing circuit, a building component tree for the graphical user interface, wherein the building component tree comprises one or more draggable building components and one or more non-draggable building components and causing, by the processing circuit, the graphical user interface to include the building component tree comprising the draggable building components and the non-draggable building components. The method includes receiving, by the processing circuit via the graphical user interface, a selection of one of the one or more draggable building components and a user interaction dragging the one of the one or more draggable building components into a window of the graphical user interface.

The present disclosure relates to a heating, ventilation, and/or air conditioning (HVAC) system that includes a return air section of an HVAC unit configured to receive a return airflow from a conditioned space. The HVAC system also includes an outdoor air section of the HVAC unit configured to receive an outdoor airflow from an environment surrounding the HVAC unit. Furthermore, the (HVAC) system includes a panel dividing the return air section and the outdoor air section. The panel includes a bypass damper actuatable to enable mixing of the return airflow and the outdoor airflow to produce a mixed airflow in the outdoor air section.

Various embodiments are described herein for an environmental control system. In one example embodiment, the system is an HVAC system including an HRV or ERV unit, a first distribution system, and an ambient energy distribution system. The first distribution system has a first end in thermal communication with the HRV or ERV unit and a second end in thermal communication with the interior of a domicile. The ambient energy distribution system extends between first and second locations in the domicile and is isolated from fluid flow communication with the first distribution system. The ambient energy distribution system transfers heat between the first and second locations.

Configuration of flow paths for the output (e.g., chilled or heated air) of an HVAC system is described. In one embodiment, a demand response message can be received from a resource provider requesting that the HVAC system increase or decrease consumption of the resource. If the request is satisfied, then the output from the HVAC device will be increased or decreased resulting in potential discomfort for occupants. This output, however, rather than being distributed in a uniform manner, can instead be distributed, via ventilation elements of the HVAC system in a non-uniform way according to the flow paths. The flow paths can be determined to direct sufficient output to high priority zones in order to, e.g., satisfy a comfort level in the high priority zones.

An air conditioning system is provided and includes a unit receptive of refrigerant having a moderate-to-low global warming potential (GWP) value for thermal interaction with a fluid, an enclosure, a fan disposed and configured for urging a flow of the fluid through the unit, a refrigerant detection sensor and a controller. The refrigerant detection sensor is disposed in the enclosure to be operable in a first mode in which a baseline response is established and a second mode in which refrigerant leak detection is executed based on the baseline response. The refrigerant detection sensor is further configured to generate a binary output of leak and non-leak signals in accordance with a result of the refrigerant leak detection. The controller is configured to control operations of the fan and the vent based on the binary output.

A heating and cooling system or installation for heating or cooling air within a building space, including a water chiller for chilling water and a coil to which the chilled water can be delivered. Air can then be driven by a fan through the coil to cool the air and the cooled air can be delivered into the building space for cooling the building space. The system can include a water heating facility to heat water that is delivered to the coil so that air driven through the coil can be heated. The coil is connected to ducting for delivering cooled or heated air to the building space.