wally61 wrote:i had this problem with my alaska channing III. My stove can heat up to a 2500 sq.ft. house and my house is only 1700 sqft so when in max mode it was pummping coal to heat 2500 sqft. I turned my max dwn from 40 to 20 and this seeemed to stop over shoot. my stove is direct vent. themostat is right next to the honeywell for my furnace. house is a 2 story stove is in dining room middle of house. dwn stairs stay at temp set on coal-trol and upstairs bedroom furthest away 4 degrees different. love it
For some, Wall61's suggestion works very well. The idea is that for houses (especially "well" insulated) the stove essentially is oversized (more BTUs) than is required. By reducing the MAX setting, the "Size" of the stove is effectively reduced and this allows for tighter temperature control. For example, earlier this season I spoke to someone with overshooting issues. I asked him what his firing rate was. At the time I asked, his set-point temp and actual agreed i.e. the fire was stable and he told me FR=18% even with the outside temp in the mid 20s F. By reducing his MAX from from 85 to 65 (Keystoker ) his overshoot was eliminated.
One word of caution is in order: it really isn't much help to reduce the MAX setting so low that the stove can't keep up on the coldest days. Also, the idea is that this "Tuning" should remain a "one-time" setting.
In summary, for I'd guess 2-5% of folks with good insulation AND overshoot:
1) On a cold day when the measured temperature is within a degree of the setpoint temperature (stable condition),
a) Go to setup and look at the firing rate (FR),
b) If FR is say 65% or more, then you might want to leave MAX alone.
c) If FR is less than 65%, you may want to reduce the MAX value in small amounts, say 10-20% of it's value at a time to increase the steady state firing rate, that is to say the FR%. Remember, check the FR when in steady state, otherwise the reading and your adjustments will be meaningless.
Finally, on occasion I talk with a user whose problem can be categorized as an air distribution problem and this can exhibit symptoms of undershoot/overshoot. I'll save comment on this for another time as this post is long enough.
Thanks WNY and everyone for the thoughtful comments.