In residential systems using zones, where should a bypass relief be installed?

Installing a bypass relief in between the supply and return air plenums is essential for maintaining balanced air pressure within a zoned HVAC system. When a zone's dampers close, it can create excess pressure within the duct system, leading to potential damage or inefficiencies. The bypass relief allows the excess air to flow back into the return plenum, preventing an increase in pressure that could cause noise, reduce system efficiency, or even lead to ductwork collapse.

Additionally, this positioning helps ensure that the overall airflow within the system remains stable, promoting efficient operation and preventing issues that arise from pressure imbalances. Other placements, such as at the outdoor unit, near the thermostat, or in the main ductwork, would not offer the same level of efficiency or pressure control as installing it directly between the supply and return plenums. This strategic location ensures that the airflow is adequately managed throughout the entire system, allowing for consistent performance across the different zones.