I was using a Bacharach(?) manometer prior to receiving the Dwyer in the mail. I did measure the draft in the flue in between the boiler and the damper. The manometer didn't have a negative or postive sign next to the numbers. I'm guessing the flue pipe is negative because my CO detector never went off, the flue pipe is cooler, and air is being sucked into the damper, not pushed out. Anyway, the reading is a little higher than -.01. When I close the damper door the needle shoots up to -.03.
When measuring the draft over the fire, I'm getting positive .015ish. This is when the stoker is running. If I close the damper door, the needle moves up to positive .02. This stuff is starting to look like voodoo.
Why would I get a positive pressure over the fire?
I double checked the feed rate. The dealer told me he set it at 6 teeth. It was 5 teeth. The air was also at 6. I backed it down to 5. Stoker-man tells me that you can look at the ash ring around the pot to eye-ball an optimul burn. I don't know what I should be looking for? Could an inaccurate air intake setting explain why I'm getting a positive pressure over the fire?