Originally had zoning system installed with barometric bypass on the single speed air handler, now after replacing it wit variable speed one i have a question about need of the bypass. Sometimes I notice drive and bypass is fighting each other and I end up with fully open bypass and full speed running air handler with on zone open.
Little background: 3-zone system all equal sizes total airflow set on 1000/750cfm hi and lo.
So do I need a bypass? What is downside?