Did a hot changeover of my blower fan yesterday (bonus question: Guess what's hot when you do the changeover during the heating season?) but I have some unresolved issues.
Draft over the fire when running is 1.75-2. Draft in chamber without a flame is 4+.
At the baro, while running, draft is 3.5, I can't measure anywhere else, but my feeling is that before the baro the draft would be ~4 or so.
The problem is that the fire is burning back at the end of the grate, and I still do not have that 'blast furnace' jet of flame that I had initially up towards the front. . Prior to this heating season, the grate was removed and the fines cleaned out, so while I undoubtedly have some fines under the grate I do not think that I am clogged as of yet (though I will be checking).
My feed rate hasn't changed at all, I taped the feed screw back when I initially set up the boiler and that remains on the screw. I have a full grate of burning coal, with about a 1/2 inch of ash at the end.
The flame looks like a fireplace, and barely reaches the diffuser. I'm sure this is the reason I'm having recovery issues, but I'm stuck about what it could be at this point. This weekend I'll pull the grate and check for fines, and if that doesn't work I'll increase the feed a little bit. My guess though, based on how much coal is currently burning on the grate is that the feed is fine.
Any suggestions would be welcome.