Auto dampner

well, i have to do something,,,,l have a harman tl300. I heat the whole house with it from the basement. Heats everything perfectly.

The problem is, when i load it up to the top, (dry oak) about 1-2 hours later, the digital probes in my pipe have gone up too high of temps. Last night it hit 1408 deg. We have alarms, so we run down and shut the air completely off, but still have to open stove top intermitantly to help stove cool off. The stove top will be 500-650 degrees. The problem is the temp in the pipe!

It does it on every full load. The afterburner is roaring like a train, and it takes up to 1 hour to get temps down. The temps always normally run 600-850 in the pipe when afterburner is running. It will NOT do it if only a partial load.

We replaced the afterburner insert last week. Did not help.

I was thinking my 30 ft chim is just too much draft, forcing it into an uncontrollable blowtorch situation.

I need a "temp controlled"draft controller in the pipe to shut the draft down some when it gets over a desired temp, then open back up when temp is reduced. Anything exist?

Highbeam said:

A barometric damper could also do it with a lot more risk.

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Why is this more risky? The stove shop recomends this.

realstihl said:

I work around gas fired boilers and furnaces that use them. The problem with a wood fired appliance is that it will draw in cooler air through the damper and cool the flue gas. I know that some wood furnaces use them.

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Isnt that the object? To cool down the flu and reduce draft? Or do i understand wrong?

Well i put a barametric damper on it and started a fire tonite. Instant difference. I will probably have to learn to run the stove all over again. It does not shoot up over 1000 deg in the pipe now. In fact it hasnt got over 720 deg with the bypass open, then when i shut the bypass, the pipe goes down in the 230-250 range. That seems pretty cold. I need inbetween the two. I will know more when i get my coal bed up and start a real burn cycle. So far i have the air control open twice as far.

525 stovetop. 277 in the pipe per digital probe. Still dont have a coal bed though

begreen said:

Watch that chimney closely for creosote buildup. I would check it in a week. In the meantime set the barometric to admit less air under strong draft and very little under moderate draft.

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There is only 1 adjustment. You move a weight in a slot. I have it shut to the max, but i think it changed the draft too much. Will key damper fit in double wall?

Looking at this to try next.

http://www.amazon.com/DuraVent-8679-Double-Adapter-Section/dp/B003JV7X02

Will that (key damper) stay where i put it,,or will the draft move it?

550 stovetop with 390 flue. Getting better as coals build.

Harman told us to put it on. My dealer called them with my problem. They even gave me the setting of .06 to initially set it at.

I am taking it out today. Last night on a full load burn, the highest the flue got was 441 deg. Most of the time it was 260-320. That is on my prob at the bottom of the 34 ft chim. I think i need 450-500 constant.