Patent ID: 9638433
Date: 2017-05-02
CPC Classifications: F24F

Claim:
1. A heating, ventilation, and air conditioning (HVAC) system, comprising: a controller; a bypass duct configured to selectively receive a bypass airflow therethrough; and a bypass damper associated with the bypass duct, wherein the controller is configured to selectively modulate the bypass damper to increase the bypass airflow through the bypass duct in response to a supply air pressure of the HVAC system being greater than or equal to a supply air pressure threshold value; wherein the controller is configured to discontinue modulation of the bypass damper to lock the bypass damper in its current position in response to a supply air temperature (1) being less than or equal to a supply air temperature threshold value when the HVAC system is operated in a cooling mode and (2) being greater than the supply air temperature threshold value when the HVAC system is operated in a heating mode; wherein the controller is configured to modulate the at least one zone damper to the exclusion of the bypass damper that is locked in its current position to increase airflow to a zone of the HVAC system in response to the supply air temperature (1) being less than or equal to a supply air temperature threshold value of the HVAC system when the HVAC system is operated in the cooling mode and (2) being greater than or equal to a supply air temperature threshold value while the HVAC system is operating in the heating mode, and wherein the controller is configured to reset the at least one zone damper to a temperature setpoint based control position and unlock the bypass damper from its current position in response to the supply air temperature(1) exceeding the supply air temperature threshold value when the HVAC system is operated in a cooling mode and (2) being lower than the supply air temperature threshold value when the HVAC system is operated in a heating mode.