Abstract: An airflow sensor system for an air duct including a damper positioned therein is provided. The controller is configured to determine, via a first pressure sensor, a first airflow measurement based on a first one or more pressure measurements. The controller is further configured to determine, via a second pressure sensor and a damper position sensor, a second airflow measurement based on a second one or more pressure measurements and one or more damper position measurements. The first airflow measurement and the second airflow measurement have a first uncertainty value and a second uncertainty value associated therewith. The controller is further configured to determine an estimated airflow based on weighted values of the first airflow measurement and the second airflow measurement. The weighted values are based on the airflow measurements and the uncertainty values associate therewith.

Abstract: A system for controlling a flow rate through an HVAC component is provided. The system includes a controller communicably coupled with a potentiometer and an actuator configured to drive the HVAC component between multiple positions to affect the flow rate. The controller configured to determine an actuator position setpoint based on a flow rate setpoint, drive the actuator to the actuator position setpoint using a calculated travel period, and set a current actuator position based on a voltage signal received from the potentiometer upon stopping the actuator at an expiration of the calculated travel period.

Abstract: An illustrative embodiment disclosed herein is a circuit for sensing heating, ventilation, air conditioning, and refrigeration (HVACR) equipment. The circuit includes an input port that has an input voltage signal. The circuit includes an analog-to-digital converter (ADC) generating a first digital signal based on receiving a representation of a supply voltage, generating a second digital signal based on receiving the divided input voltage signal, and outputting the first digital signal, the second digital signal, and an output voltage reference. The circuit includes an amplifier coupled to the ADC and amplifying the output voltage reference to generate a supply voltage. The circuit includes a microprocessor coupled to the ADC and configured to calculate a first ratio of the first digital signal and the supply voltage. The microprocessor is configured to determine the input voltage signal by calculating a second ratio of the second digital signal and the first ratio.

Abstract: A controller for controlling operation of an actuator in an HVAC system is shown. The controller includes a processing circuit configured to receive, via a position sensor communicatively coupled to the actuator, a first voltage value, the first voltage value indicative of a first position of the actuator. The processing circuit is further configured to provide a control signal to the actuator to move to a second position. The processing circuit is further configured to, in response to the actuator moving to the second position, determine that the actuator is located in a different position than the second position based on a second voltage value via the position sensor. The processing circuit is further configured to automatically perform a fault correction process to calculate an updated stroke range of the actuator.

Abstract: A controller for controlling power consumption of devices within a building management system (BMS) is shown. The controller includes a processing circuit configured to determine, via a plurality of devices, an active device. The processing circuit is further configured to determine a power consumption of the active device using at least one of an address of the active device or an attribute from a device object associated with the active device. The processing circuit is further configured to compute a total power consumption value of one or more active devices of the plurality of devices, the one or more active devices comprising the active device. The processing circuit is further configured to compare the total power consumption value with a threshold value and, in response to determining that the total power consumption value is greater than the threshold value, arbitrating the power supplied from the bus to the active device.

Abstract: An illustrative embodiment disclosed herein is a circuit for sensing heating, ventilation, air conditioning, and refrigeration (HVACR) equipment. The circuit includes an input port that has an input voltage signal. The circuit includes an analog-to-digital converter (ADC) generating a first digital signal based on receiving a representation of a supply voltage, generating a second digital signal based on receiving the divided input voltage signal, and outputting the first digital signal, the second digital signal, and an output voltage reference. The circuit includes an amplifier coupled to the ADC and amplifying the output voltage reference to generate a supply voltage. The circuit includes a microprocessor coupled to the ADC and configured to calculate a first ratio of the first digital signal and the supply voltage. The microprocessor is configured to determine the input voltage signal by calculating a second ratio of the second digital signal and the first ratio.

Abstract: A system for controlling a flow rate through an HVAC component is provided. The system includes a controller communicably coupled with a potentiometer and an actuator configured to drive the HVAC component between multiple positions to affect the flow rate. The controller configured to determine an actuator position setpoint based on a flow rate setpoint, drive the actuator to the actuator position setpoint using a calculated travel period, and set a current actuator position based on a voltage signal received from the potentiometer upon stopping the actuator at an expiration of the calculated travel period.

Abstract: Implementations herein relate to visualization of interaction with a building management system (BMS). Such interaction may be facilitated with a smart headset that displays a three-dimensional model of an image with real-time data from the BMS to enable monitoring and control of the BMS. In one implementation, a system for locating a target in a building includes a server, a first wireless emitter, and an application on a mobile device. The first wireless emitter is associated with the target and configured to emit a first emitter identifier within a first range. The application is configured to detect the first emitter identifier when the mobile device is within the first range. The application is also configured to transmit the first emitter identifier to the server in response to detecting the first emitter identifier. The application is also configured to receive a first content from the server.

Abstract: Implementations herein relate to visualization of interaction with a building management system (BMS). Such interaction may be facilitated with a smart headset that displays a three-dimensional model of an image with real-time data from the BMS to enable monitoring and control of the BMS. In one implementation, a system for locating a target in a building includes a server, a first wireless emitter, and an application on a mobile device. The first wireless emitter is associated with the target and configured to emit a first emitter identifier within a first range. The application is configured to detect the first emitter identifier when the mobile device is within the first range. The application is also configured to transmit the first emitter identifier to the server in response to detecting the first emitter identifier. The application is also configured to receive a first content from the server.

Abstract: A heating, ventilation, or air conditioning (HVAC) system with automated flow direction detection is provided. The HVAC system includes one or more hoses configured to provide airflow from HVAC equipment, a bidirectional pressure sensor coupled to the hoses, and a controller coupled to the bidirectional pressure sensor. The controller is configured to receive a signal from the bidirectional pressure sensor, determine a direction of the airflow relative to the bidirectional pressure sensor based on the signal, correct the signal for a reversed hose polarity relative to the bidirectional sensor based on the direction of the airflow, and perform a control activity using the corrected signal.

Abstract: A heating, ventilation, or air conditioning (HVAC) system with automated flow direction detection is provided. The HVAC system includes one or more hoses configured to provide airflow from HVAC equipment, a bidirectional pressure sensor coupled to the hoses, and a controller coupled to the bidirectional pressure sensor.

Abstract: Computerized methods and systems for determining flow direction relative to a bidirectional pressure sensor are provided. The method includes receiving pressure information from the bidirectional pressure sensor. The method includes using the pressure information to evaluate, at a processing circuit, pressure at the bidirectional pressure sensor over time, The method includes assigning a flow direction to a current pressure of the bidirectional pressure sensor by comparing the current pressure to at least one past pressure.

Abstract: Computerized methods and systems for determining flow direction relative to a bidirectional pressure sensor are provided. The method includes receiving pressure information from the bidirectional pressure sensor. The method includes using the pressure information to evaluate, at a processing circuit, pressure at the bidirectional pressure sensor over time, The method includes assigning a flow direction to a current pressure of the bidirectional pressure sensor by comparing the current pressure to at least one past pressure.

Abstract: A flow measurement device and a VAV device are adapted to be directly coupled. The flow measurement device is adapted to automatically make and record flow measurements and to communicate the measurements to a VAV controller. The VAV controller is adapted to receive the flow measurements and self calibrate in response thereto. The VAV device is further adapted to report results of the calibration process to a system central and/or supervisory controller.