Prerequisite: the WFS camera is in state 'StartedUp' (the Peltier controller should be off, and the CCD temperature should be >0C).
Look for the pump (ArgosCabinet0). You need the pump, the power cord, a long extension cord (most likely available at level 5) and the vacuum fittings that are stored in a small carton box with the pump.
Place the pump as close as possible to the pnCCD valve, the small platform behind the ARGOS WFS rack is a good location.
Connect the power and the vacuum tube from the pump to the pnCCD (make sure the connections are tight).
Start the pump and wait a few seconds (to have vacuum in the tube).
Open gently the camera vacuum valve and monitor in parallel the pressure (if the pressure were to rise, close the valve as fast as possible).
Once fully open, let the pump run for a couple of minutes to ensure an effective pressure <1mbar.
Gently close the valve.
Monitor the gauge pressure making sure it converges.
Stop the pump, disconnect all, and place the pump back in the proper storage (in ArgosCabinet0).
Don't forget to fill the respective twiki page of the respective camera: WfsCamera1 (SX) or WfsCamera2 (DX).