Abstract: An economizer having a first air inlet, a second air inlet and an air outlet, a method of operating an economizer and a heating, ventilation and air conditioning (HVAC) system employing the economizer. In one embodiment, the economizer includes: (1) a first damper blade assembly in fluid communication with the first air inlet and the air outlet and having a first plurality of damper blades configured to move in parallel and (2) a second damper blade assembly in fluid communication with the second air inlet and the air outlet and having a second plurality of damper blades configured to move in opposition.

Abstract: An economizer having a first air inlet, a second air inlet and an air outlet, a method of operating an economizer and a heating, ventilation and air conditioning (HVAC) system employing the economizer. In one embodiment, the economizer includes: (1) a first damper blade assembly in fluid communication with the first air inlet and the air outlet and having a first plurality of damper blades configured to move in parallel and (2) a second damper blade assembly in fluid communication with the second air inlet and the air outlet and having a second plurality of damper blades configured to move in opposition.

Abstract: An economizer having a first air inlet, a second air inlet and an air outlet, a method of operating an economizer and a heating, ventilation and air conditioning (HVAC) system employing the economizer. In one embodiment, the economizer includes: (1) a first damper blade assembly in fluid communication with the first air inlet and the air outlet and having a first plurality of damper blades configured to move in parallel and (2) a second damper blade assembly in fluid communication with the second air inlet and the air outlet and having a second plurality of damper blades configured to move in opposition.

Abstract: A controller, an HVAC system employing the controller and a computer programmable product to implement a method of measuring and managing ventilation airflow of an HVAC system is disclosed. In one embodiment, the controller includes: (1) an interface configured to receive feedback data from the HVAC system, the feedback data corresponding to a pressure difference across the outdoor damper and an economizer damper position and (2) a ventilation director configured to determine a ventilation airflow rate of the HVAC system based on the pressure difference, the economizer damper position and economizer ventilation data of said HVAC system.

Abstract: Disclosed herein are a heating, ventilating, and air conditioning (HVAC) unit and a HVAC controller. Additionally, a computer program product is disclosed. In one embodiment, the HVAC controller includes: (1) an interface configured to receive audio data from a listening system of the HVAC unit and (2) a mechanical behavior evaluator coupled to the interface and configured to verify occurrence of an event of the HVAC unit based on the audio data.

Abstract: An economizer having a first air inlet, a second air inlet and an air outlet, a method of operating an economizer and a heating, ventilation and air conditioning (HVAC) system employing the economizer. In one embodiment, the economizer includes: (1) a first damper blade assembly in fluid communication with the first air inlet and the air outlet and having a first plurality of damper blades configured to move in parallel and (2) a second damper blade assembly in fluid communication with the second air inlet and the air outlet and having a second plurality of damper blades configured to move in opposition.

Abstract: A heating or cooling system comprising a powered fan held in a duct assembly. The powered fan generates acoustic noise when blowing air. The system also comprises an acoustic wave modulator held in the duct assembly. The acoustic wave modulator has one or more fins and is configured to reduce turbulence of the air traveling through the duct assembly.

Abstract: A heating or cooling system comprising a powered fan held in a duct assembly. The powered fan generates acoustic noise when blowing air. The system also comprises an acoustic wave modulator held in the duct assembly. The acoustic wave modulator has one or more fins and is configured to reduce turbulence of the air traveling through the duct assembly.