Hi titleist1, Don't know what to tell you about grates warping , All I can tell you, is what he told me. We were talking about his Harman Mag Stoker. Which is how he heats his place. I liked the concept of the vertical feed.titleist1 wrote:Basically it would be having the combustion fan blow too much air under the grates while feeding coal so fast that burning coal is going off the end of the grates. They have a pic in the old mag stoker manual indicating what overfiring looks like but there is no description saying how to avoid it.
Besides overfiring, too much combustion air could also pressurize the firebox causing CO to leak into the living space. That is why when setting up the restrictor plate on the combustion fan of the stove a manometer reading in the firebox as well as the flue pipe should be taken.
I am very surprised at the yearly grate replacement. Mine runs pretty much full time usually for about 2 months of the year (three months this year) and the grates aren't getting damaged. If he is cementing them in place maybe they are warping due to lack of movement.