Replaced the door seals on my furnace last Friday and lit her up. Haven't been able to get the stack temp below 150° all week, and have found a low spot in the ash pan door seal. Planning to shut down and try again tomorrow, just not sure what happened
. I didn't "pull" the rope, made sure it was bunched into the channel and not stretched...
For a little history, I replaced the seals in 2011 when I started burning. Used 1/2" rope then, as the channel measures 1/2" wide. Seemed to work fine, but have never been able to "choke" the fire with this furnace. Nor sure if that's a separate issue or not. Fast forward to last year, replaced the seals again just for maintenance. Again used 1/2" rope, but the doors didn't seem to close as tightly as before. Kind of like when the seals are new and not broken in, only they never broke in (it stayed like that all winter). I assumed it was due to accumulated cement in the channel, as I had no good way to clean it all out...
So, this year, I removed both doors from the furnace and thoroughly cleaned the channels to bare metal. As said, resealed last week with 1/2" and I can tell it's leaking somewhere. Did the dollar bill test and found only one notable spot, can feel it when running your fingers over the gasket too.
My question is, should I try 5/8" rope, or will that be too fat to close the doors? Or is it something I did wrong? Only thing I did different this year is using only a spot of cement every few inches, rather than a continuous bead like in previous years. After finding out how miserable it is to clean, didn't want to use any more than necessary. Can't find any info on the furnace to indicate what size gasket rope was originally spec'd for the unit.
Any help appreciated, thanks