What is the earliest morning shuttle from Beijing Capital Airport Terminal 3 and Terminal 2 on Mon, 29 August, 2011?

I want to stay in the Hourly Lounge in Terminal 3, but my flight (DL 188) leaves from Terminal 2 at 7 AM. I need to be in Terminal 2 by 5 AM. That's why I need to know the time of departure of the early morning shuttle from Terminal to Terminal 2. Thanks.