I have a new 5100i insert, and am a little confused about he ACC. Its not really making sense to me. Instructions say to activate it, push the air control back until it stops, then pull it forward. When you look at what is happening inside the stove by removing the top, this doesn't compute. When you push back the air control, the little damper opens, but when you pull it forward again, the damper closes. How does that allow air into the stove for automatic warmup? Other posts have suggested you can hear a timer clicking, I hear nothing like that. I'm confused.