Who knew what was on his mind - but he was certainly aware that the respirator could be used to save another life. As we age, we get tired, and ready to move on from this life. As Saint Paul wrote in his Letter to the Philippians, he longed to leave this world and go to the Father, but he agreed to remain here if there was profitable work (i.e. evangelization) for him to do. And so it may be with Fr. Berardelli.
Eternal rest grant him O Lord, and let perpetual light shine upon him. May his soul and the souls of all the faithful deputed, through the mercy of God, rest in peace.