Please help me make a list of all the ways to do this: I want to control a damper on my system based on pressure in ductwork. Simple "on" and "off" is fine if the trigger pressure is adjustable.
Background: A 2-stage AC system, where I want to consider a fresh air vent to the return plenum which can only open in 1st stage. When the system is in 2nd stage it is working harder to meet temperature setpoint and I see no sense in feeding it outside air and making its job harder.
Ideas for non-electric ways to control a damper would be particularly welcome. I know there are electrical signals that could get the job done, am looking for all the possible ways. Perhaps someone makes a pneumatic bellows that can move a damper control arm?
Thanks for any ideas -- C44
Background: A 2-stage AC system, where I want to consider a fresh air vent to the return plenum which can only open in 1st stage. When the system is in 2nd stage it is working harder to meet temperature setpoint and I see no sense in feeding it outside air and making its job harder.
Ideas for non-electric ways to control a damper would be particularly welcome. I know there are electrical signals that could get the job done, am looking for all the possible ways. Perhaps someone makes a pneumatic bellows that can move a damper control arm?
Thanks for any ideas -- C44