New here, but I have been lurking 3 years trying to get my Clayton to put out heat and also burn anthracite.
What I found that has not been posted here before is 2 things.
First, as to no heat issue.. Struggling with this thing and getting ready to scrap it, I recently had a Bingo and found MY solution. My fix was in the duct work. Dumping into the supply duct of the furnace, one would think it would eventually find it's way into the house so that was the last thing I looked at. However, desperate for the heat this thing was creating but not sending it to the house, I decided to cut a slot in the duct and jam a sheet metal blocker in the duct, forcing all air into the supply only direction. BINGO All the heat I wanted instantly. it seemed I was loosing a very large percentage of heat and airflow into the ducts and it went no where.
Second As to the Clayton ash door draft and the Middle draft that the combustion blower goes on (Which I don't have the blower) I found that the two spin drafts go to exactly the same place!!!! The only thing different between using one or the other that I can see, is the top one hits the cast iron firebox end and preheats the air.
This took me 2 years to figure out. It does not matter if you use the upper spin draft or the bottom, the air flows both to upper firebox holes and under grates.
Maybe I have an odd ball, but this played heck on my burning anthracite, thinking the air in the ash pan door was only going under the grates.
I have stuffed insulation in the holes on the end plates, but I'm finding more air leakage points all over the firebox every time I clean for a new loading. Just under the front door is the second place I found air leaks, a plate I thought was solid welded was only spot welded, leaving air in.. stuffed that with insulation also.. Also found the end plates along the sides are a source of leakage also.
As it's burning now, I'm convinced there are more and will do more searching at next cleanout time.
Just thought I'd add these facts I found in case others have the same problem as I've not seen these points brought up yet.
The Spin drafts sending air to the same places was a real eye opener when I found it. They are NOT separate top and bottom air feeds. Again, only reason I can see to use one or the other is that the top one drives the air into the cast iron front plate preheating the air.
This really has me wondering also, if this is not why it eats wood at an ungodly rate... no matter which spin damper you use, it still goes under the grates and above. To me, this seems like a very poor design for air feeds.