Stand clear from the screen when it is in motion. .. Supervise children and animals when the screen is in motion. .. Keep hands and limbs away from the door and arm assemblies when the unit is in operation. OPERATING THE SCREEN Figure 4. Connecting the STI To Projector or AC power source Optional 12 VDC transformer with switch Automatic Vertical Screen: Owner’s Manual 7 ADJUSTING THE SCREEN EXTENSION The extension and retraction limit switches have been preset at the factory. In general, we advi