In occupied mode, the Bypass Damper Controller monitors the duct static pressure. When the static pressure rises above the setpoint, the Bypass Damper modulates opens to decrease the pressure. When the static pressure drops below the setpoint, the Bypass Damper modulates towards the closed position to increase pressure.
In unoccupied mode, when the single packaged unit is OFF, the Bypass Damper modulates to 50%. If the single packaged unit is ON, the Bypass Damper controls according to the occupied mode sequence.