Reading Allegheny temp overshoot

I recently purchased a Reading Allegheny with the coaltrol system. I have the stove dialed in, i think With a min-3 max-25 cft-8. I have the day setback at 63 and the night setback on 75. The problem i am having is when it switches from day to night and ramps up to warm the house up, it takes forever to ramp back down and the house ends up being 80 plus degrees by the time it returns to idle. I was wondering if there was another setting i am missing or if my setbacks are just too far apart?

Welcome to the forum, I have a Hitzer stoker with coal-trol. Diffrent but the same as yours. One of the first things I learned is everything happens slow with coal. Heats up slow ,cools off slow.I found anything more than a 2degree set back or up caused overshoot or undershoot. It takes some time for the stove to get cranked up to max feed rate to bring your set up temp up 10 degrees, it's still at max feed rate when you get to your set temp. Then it takes time for the stove to come back to normal causeing the overshoot. Other things can effect overshoot like house construction, insulation, t-stat location. Yours sounds like you have just to much of a diffrence between set temps. It's not a hot air furnace and will not act like one.

I tried changing the thermostat for a two degree setback. Is there actually any point to using the setbacks? Does anyone actually see less fuel usage from it?

I have never used the set back. I think most people don't use it. If you do use it I would start with a 2 deg. difference then keep adding 1 deg. to see where your temp. overshoot is to much

WAY too much temp. swing for it, it will feed, and feed and feed to make up the difference and normally overshoot.

COAL is NOT like a gas furnace, it takes TIME to respond, it not like it can be shutoff immediately at the temp. setpoint, it will take and hour or more for the temp to come back down and stabilize.

If you read some of the posts about using the Coaltrol, most of us do NOT use the setback, if you do, only use it a few degrees and give it at least and hour before you want the temperature setpoint.

Most of us just leave it a set temperature.

Does anybody know if the heat loss factor(hlf) setting affects how the firing rate decreases? That is the one thing I haven't played with yet

Yes the technician in me has looked at all the settings . HLF I believe sets how fast the stove responds, ramp up and ramp down depending on what the temp calls for. I believe mine is cranked up 1 value, because I routinely open a door in the evening to my garage man cave and the bride gets cold in the family room where the stove is.Remember we are heating with small locomotives, yes they will, yes they can, but their time frames are more in biblical time than modern time. Not really a bad thing when you enjoy the benefits of our economical heat. I tell my daughter if you are warm open a window Who does that with oil

Yes, it changes the ramp up response. I think I have mine at 2, since my stove is in the basement and the thermostat is in the living room, our house cools down fast at night. Usually only about 1 degree difference when the temps start changing. I still only leave mine at a certain temperature all the time, and only change a couple degrees when needed. keeps more even temps.

Like the others have mentioned, the HLF setting only jump starts the rise in feed rate to meet a higher set point, it doesn't affect the time it takes to lower the feed rate after the thermostat has been satisfied.

When you have a big set point change to increase your house's temperature, usually your feed rates will climb very high. Once the thermostat is satisfied it takes a long time for the feed rates to come back down to near "idle mode". I think the rate of descent on the feed rate is a set speed, so no matter if you are 1 degree or 10 degrees above your thermostat's set point, the feed rate will still descend at its set speed.

Is this plumber?