1 hour before sunset:  Old Console Room ( C Floor )

1. Check Weather Conditions [2]
2. Orient the shutter eastward to make sure no direct sunlight will enter the dome.
3. Open the dome (before opening mirror cover!)
4. Open the mirror cover
5. Turning OFF mirror cooler executed automatically ( BECS [3] )
6. Turning ON sucker & extractors executed automatically ( BECS [3] )
7. Turn OFF dome floor stirring fan
8. Turn OFF both AHU's units
9. Open the lateral sliding doors
10. Make sure all passageway doors are closed.
11. Make sure all lights are off in each floor.

** In the Console Room : G Floor

     ** READ THE OPENING CHECKLIST PROCEDURE

         FOR EACH INSTRUMENT CURRENTLY IN USE:

                            DECAM        COSMOS

At Sunset :

1. OPEN ATMCAM
2. OPEN RASICAM
3. CHECK THE DIMM STATUS