Carbon12 wrote:I'm still perplexed that the draft over the fire didn't move much from ideal settings upon opening the window and the barometric damper opening to nearly full open. Colder, denser air resulting in more draft over the fire so the damper opened more to compensate maintaining the set draft over the fire???
Put aluminum foil over your baro damper and then watch your manometer as you open and then close the window. If the manometer metered draft generally goes up when the window is open and down when it is closed, I would think that indicates that the fire in your boiler is sucking the air pressure right out of your boiler room, and creating a lower pressure environment therein which effectively reduces the differential between the chimneys (reduced) pressure and the rooms pressure, thus causing the manometer to indicate reduced chimney draw. If that is the case, your boiler could very well be starving for air. That could result in more CO than you want or need.
Where is Sting when we need him? He understands this issue well.