Temp over shoot

Hello I may be having an issue withe my coaltroll unit but not sure. My unit is TS2 model, hooked up to a harman mag stoker. I have both day and night settings set at 72. Also I have the distribution air run through ductwork to the room the coal troll unit is in. Well here is my problem. For some reason the temp in the house keeps shooting up to 75-77 and today never started to go down till I unpluged it and pluged it back in. I under stood when the temps were up and down but now that it is cold shuldent it maintain temp better that is why I have it. If I have to deal with the wide temp swings I may as well go to a handfed. Thanks in advanced.

If you do a search on TEMP OVERSHOOT, its been discussed.
Coal takes time to respond. If the Feed rate goes down and there is no call for heat, then it goes into Idle, then if your house cools down a few degrees, it can take a while for it to get back up to temps, and then it gets cranking and overshoots a bit. If you have the sun help heat your house, it can make the coaltrol think it doesn't need any heat and basically go down to FR=0, and it just idles along.

Once it gets going, it can take an hour or more for it to settle down, no need to unplug it.

Guess we need a bit more info of your setup, house insulated? Windows? etc...Coal Trol Setting? Min/Max,
Where is your thermostat located in relation to the stove?

Other threads to read.
Thermostat overshoot

day night problem with hy fire 2

How long is the duct work to the room? is it possible that the stove in the basement, gets cranking to much and then till the heat gets upstairs, it over shoots? Will it stop once it overshoots or does it keep cranking? When the overshoot happens, can you see the FR drop? I thought there was something in the advance setup to control the ramp up time not sure though, maybe one of the coal-trol guys could be of more help.


Best of luck, Eric

Well to answer your question My stove is in the basement, but like I said I have the distribution air is hooked to ductwork run to the living room where the t-stat is. My house is a block house with insulation only in th celing. It was 25deg when i got home from work the temp in the house was 75 and the feed rate was 51. I went down stairs to see why it was so hot and the stove was about 725deg. went back upstairs and the feed rate went to 52 so I unpluged the unit and pluged it back in and the feed rate went down to 0 within 5 minuts. My stove is set to the instructions according to the manuel with the feed 5-99. Max feed is adjusted for the harmen by the max setting on the stove.

What are you MIN/MAX setting in your COALTROL? 6 and 40? or something like that. You don't set the FEED Rate, it is automatic in the Coaltrol based on the room temp and setpoint temp and time in between, you only set the MIN/MAX settings.

To get the FR to come down, just reduce the TEMP on the Thermostat about 5-10+ degrees, it will slow down the feed rate quickly.

Yes, the stoker on the stove should be set to max feed, but the Coaltrol should control it with the max setting in the thermostat.

Seems odd that the stove got that hot, unless the blower or something didn't kick on or it got cooler faster than it can keep up.

Was it pushing HOT coals off the end of the burn plate? If so, the MAX in the coaltrol is up too high. Especially if you said it was only at FR=51, is should only have 1/2-3/4 of full burn plate of coal.

I want to thank WNY and Coalfire for there quick responce I believe I found my problem while reading some of the links WNY gave me. I have a house that is 1500 square ft. and the stoker is for up to 2800 square ft. Simply too big. I droped my max feed by 20% and my overshoot droped to 2 deg. Im going to drop it another 10% and see what happens. Again thanks for your info and Ill let you know how it turns out.

Sometimes you have to Dial-IN your settings based on your house...every heating is different, what works for one, may not for the someone else.
Sometimes trial and error and ask a lot of questions. We have all been there.....
Enjoy!

I too thank WNY and the rest of you guys that help out on this forum answering questions and whatnot. You're a big help to us at Automation Correct and a wonderful resource for the Coal-trol users who wander in.