rychw wrote:Bob wrote:Have you tried operating with the high temperature limit set at 170 or 180 and using a 10 differential to see if it would help? From your description it seems as if the level of the fire is still a bit low to ensure that the gases are always exposed to a source of ignition and my theory is that the sensed temperature is affected by the boiler water temperature. Also--do you have the hole in the flapper door fully open?
Bob, I have tried to operate at a higher temperature without eliminating puff backs. I hesitate lowering my ash dump temperature below 110 degrees but that may be my next move. I changed the differential to 5 from 10 that it was at for 5 years. The theory is that there will be less new coal added for only 5 degree differential preventing puff backs. The whole in my flapper is open all tha way.
McGiever wrote:My belief is, if one has "puffbacks" they must get the fire(hot coals) raised higher in their firepot.
What the digital display reads on the controller may not match the owners manual or even what other AHS owners settings are...keep adjusting lower to get the fire higher and the problem will be gone.
"rychw", You may have developed significant inaccuracies in your digital ashing controller...you just need to do as suggested and keep going lower...forget the read-out, do it by appearance of level in firepot...then you will be par w/ all the others as far as puffbacks.