How do you bleed a newmac furnace?

There is a small nipple located on the bottom of the burner itself. This nipple has a hex edge to it so you can use a small wrench (I think its a 1/4 inch) to open it. Turn it counterclockwise a few turns, then turn the thermostat up till the burner turns on. Make sure you have a bucket to catch the oil. The oil comes out of the nipple. At first its frothy then once it becomes pure close the nipple fully.