TinnerFlow™3rd YearVAV / ControlsYELLOW · Check First
Pinched VAV flow tubing can make the controller read wrong or not read at all. Lower/relocate the box enough to protect the tubing and replace damaged lines.
VAV flow pickups need clean pressure signal through small tubing. If the box is jammed into a beam/deck and the tubing is flattened, controls may think the airflow is zero, high, or unstable.
Lower or shift the box only with direction, protect the tubing path, trim/replace flattened tubing, reconnect to the correct ports, and have controls/TAB verify readings before ceiling close.
Use this as training guidance. The foreman, approved drawings, project specs, manufacturer installation instructions, employer safety policy, and AHJ/code requirements always control the final answer.