I would like to get some feedback on the best way to control a way over-sized
Cooling only VAV system.
The System has about 15 various size vav box's. The original sequence calls for 55°f supply air at 1"wc static pressure. When we set this system to auto the average space temperature gets way too cold. The vavs don't control very well if we set the minimum air flow below the .2"wc velocity pressure cut-off.
For a quick fix we started reseting the supply air temperature set-point up based
on the return air temperature. if RAT = 70 then SAT = 63. if RAT = 76 then SAT = 55.
This helps to some degree, but some zones have the damper at 100% open and not enough air flow with fan at full speed.
Mr. Engineer is now worried about humidity and mold issue's.
Anyone have any ideas