Need Help Kalamazoo Wood Furnace

[Fishkarson]

Hello,
Looking for any help or knowledge as I’m inexperienced. I have a Kalamazoo combination wood and oil forced air furnace. When I get a wood fire going at any point when I open the firebox door to add wood the smoke will come billowing out into the basement. Maybe this is proper function but I find that hard to believe. There are two separate “dampers”, one as the smoke leaves the firebox to the chimney with the little lever and the other is a flapper at the start of the straight section of chimney. I’ve attached pictures for reference. I have tried adjusting them with no luck. If anyone could give a bit of help or explanation it would be greatly appreciated, I’m open to learning just haven’t been able to find much.

 

[brenndatomu]

That lever by the end of the furnace is a manual/key damper...it would have to be open (lever in line with the pipe, not almost 90* as it is in the pic there) to load, then after you load and the fire catches, you can close it back down some, just until the flapper on the barometric damper is just open a bit (if its set right) if its not open at all, the you can just let the key damper open IMO.
If you had a manometer on the pipe it would be easier to see what's going on and adjust the key damper. (also, to verify calibration on the baro) You can buy the Dwyer Mark II model 25 for $40 or so on ebay/etc. and it works great for checking chimney draft.

 

[Fishkarson]

That lever by the end of the furnace is a manual/key damper...it would have to be open (lever in line with the pipe, not almost 90* as it is in the pic there) to load, then after you load and the fire catches, you can close it back down some, just until the flapper on the barometric damper is just open a bit (if its set right) if its not open at all, the you can just let the key damper open IMO.
If you had a manometer on the pipe it would be easier to see what's going on and adjust the key damper. (also, to verify calibration on the baro) You can buy the Dwyer Mark II model 25 for $40 or so on ebay/etc. and it works great for checking chimney draft.

Thank you! Think I know what the issue is now. I’ve tried adjusting the damper but never in line with the pipe because the lever hits the furnace but I should be able to trim the wire a little to allow a little more tolerance. However the flapper or barometric damper now that I know what it’s called, is not moving on its own whatsoever only when I manually move it. I found a replacement online so I’ll try replacing that and see how it does.
Very much appreciate the help!