(you'll have to excuse me, I'm learning how this system works as i go)
I have a 2 zone setup, one zone runs basically the whole house, the second just feeds a media room and equipment closet.
media room is less than 10% of home, and is sealed with no windows and an exterior type door with weatherstrip joining it to the rest of the home. there is a HVAC return in the room.
On each of the main ducts that feed each zone there are 2 wire normally open electric dampeners, and there is a gravity balancing dampener that feeds back into the return (balancing dampener is before the electrics, it will dump into the return if both electrics close).
The whole house seems to work fine, my concern lies with the media room. when just the media room is running, there is too much flow in the room. there is too much airflow noise, and the room short cycles. (it pressurizes to where the door whistles loud enough you can hear it in the next room)
If i adjust the media room electric dampener down to its minimum open position (seems to be still 60 or 70% open still id guess) i can get it down to where i can adjust the weight on the balancing dampener to where the flow is at least acceptably slowed (slight whistle through door, and you can hear air blowing through the vents).
My concern is when i have the balance dampener set that light, am i hurting efficiency when the whole house is running?
Can i reduce the balance weight more, or would i be better served by adding some additional (manual/fixed) restriction in the feed to the media room after the electric dampener to slow down the flow to that room so i can run the balancing dampener with less bypass when the whole house is on? (this will raise total system pressure, particularly when just the media room is running. is this bad?)