GotzTheHotz said:
I know I'm beating a dead horse, but I have a new theory that I wanted to bounce off the group. The stove is working better post the combustion fan replacement, but still have the feed shut down all the way with very occasional pot over flows. I'm burning a new pellet with little or no difference. Here's the theory: Do you think it is possible that the cold air return is back drafting? I'm using the Selkirk tube-in-a-tube and have noticed that it gets fairly hot to the touch on the outside tube, I took some temps with the point and shoot therm last night. After running full on for over an hour, the temp of outside tube was the following going up from the stove every foot or so to the 90, 5' up and 3' out. 135, 143, 154, 160, 165 at the 90. I disconnected the fresh air tube and held a smoke in front of it, it does draw back toward the outside. Do you think that the outgoing hot exhaust on the inside tube can be preheating the incoming fresh air on the outside tube enought to creat a draw issue? It seems to run ok with the FA diconnected, but I have not run it enough to be sure.
Got no Idea on the selkirk Back draft theory. But if in removing the hose it got better Perhaps the problem could be a partially blocked air intake or the length of the intake is too long just a suggestion leave it disconnected tonite but close off the connection to the sellkirk in case smoke does want to come down, I would think the back draft would only make the stove a bit more efficient as you are using pre-heated air to aid combustion rather than cold air..
I know the flow path of my stove, but not yours or anyone elses. Maybe MSG or Begreen can explain it to you.
example of a harman:
Comb blower turns on creates negative pressure inside stove... positive on exhaust pipe, Now since the inside of the stove is negative it is a vacuum so air needs to come into the stove at some point or it would implode (well maybe not that extreme).
So on the back of my stove I can hook up a hose I think it's 2 1/4" but with it removed there is a reverse damper....that is it opens inward toward the stove due to vacuum.... The air flows into this opening some goes to the airwash and the rest goes under the burnpot through the holes in the front of the burnpot. It then goes around the inside of the stove along the heat exchangers to the comb blower and out the pipe....
On my stove the main draft robber seems to be the ash that collects under the burnpot in the air flow chamber perhaps there is a build up of ash somewhere in your stove.
This is the draft that the harman guy's talk about and why it is important. Like I said don't know 'bout quads But my brother inlaw said it was your thermocouple or the fact that you burn corn...... I'll let the others respond to that one.....
Any way to make my long story short, If it is drafting related Either you have a blockage somewhere in your stoves venting path (which is not enough to trip your vacuum switch) or you have an exhaust or intake problem. What's the termination cap look like?
Again this is assuming that the t/c is in correct location and all other avenues were checked. From what I remember there was another thread you had going here on the same subject and everything had checked out which is why I have only mentioned airflow through the stove on this thread.
Did you ever swap out the control board?
Good luck
