Barometric Damper

Sunny Boy wrote:Craig,

The underside of the mano case is not square to the case. I tried that sit it on it's bottom and it threw off the reading.

Tip it up level with a wedge, or some double sided tape, better yet, mount it on a wall. The instruction sheet doesn't make it clear that the case not only has to be level left/right using the built in level gauge, it must be plumb in a vertical plain.

See if that helps. If not, then your CO alarm should be going off because it's somehow showing positive draft pressure, not negative.

Paul

Ta Paul, leveled and zeroed. Now what should I do? See attached picture. The stove is idling at the moment though.

If it were me on a day that I would be home I would keep going down by moving the weight on the draft regulator and see if it will run well down to .02 to .03. You may have to crack the primary air open a tiny bit more or maybe not. If 0.05 is as low as you can go with the adjustment on draft regulator I would put a MPD before draft regulator and after the tap for manometer. On mine with a approximate 11 feet of stack I could not get below 0.06 on a cold day without one.

ddahlgren wrote:If it were me on a day that I would be home I would keep going down by moving the weight on the draft regulator and see if it will run well down to .02 to .03. You may have to crack the primary air open a tiny bit more or maybe not. If 0.05 is as low as you can go with the adjustment on draft regulator I would put a MPD before draft regulator and after the tap for manometer. On mine with a approximate 11 feet of stack I could not get below 0.06 on a cold day without one.

Ta mate, I will try that. I have left it as is and it has settled at .03. I will see what happens come loading time.

Just as an aside, I got a thermometer for the room. The stove is idling and the room temperature is 29degC. This is after idling along the whole day. The last load was this morning. ~12 hours ago.

ddahlgren wrote:If it were me on a day that I would be home I would keep going down by moving the weight on the draft regulator and see if it will run well down to .02 to .03. You may have to crack the primary air open a tiny bit more or maybe not. If 0.05 is as low as you can go with the adjustment on draft regulator I would put a MPD before draft regulator and after the tap for manometer. On mine with a approximate 11 feet of stack I could not get below 0.06 on a cold day without one.

Agreed.
Try moving the weight and see what the mano reads. Before moving it again, leave it for about 20-30 minutes at that point and see what the stove, pipe, and room temps read before trying other baro or damper settings. Might help to write down the numbers to study later. You can even plot them on a graph and see what that shows you.

What your looking for is stove damper and baro settings that have the stove and room temps as high as possible when compared to the stack temp. The more they diverge, the more heat is staying in your house and not going up the chimney. Then the stove doesn't have to burn as much fuel per hour to heat to your comfort level. That should give you the longest possible burn times for your stove/chimney system for how warm you want it.

There may come a point as you damper the stove down, or open the baro more, that it will get to a too-low mano reading - at which point the stove and room temps drop more than you want. That's the mano range to stay out of. And, you may not find that point until really cold weather sets in, so don't be in a hurry to get all the answers right now. Mother nature will change some of them on you anyway.

So, by trail and error with the damper/baro settings, the mano and temp gauges will help show you what your system is capable of. And, when you find the best adjustments for varying weather conditions, to be able to easily and consistently repeat those best results.

Paul

Craigza wrote:

Sunny Boy wrote:Craig,

The underside of the mano case is not square to the case. I tried that sit it on it's bottom and it threw off the reading.

Tip it up level with a wedge, or some double sided tape, better yet, mount it on a wall. The instruction sheet doesn't make it clear that the case not only has to be level left/right using the built in level gauge, it must be plumb in a vertical plain.

See if that helps. If not, then your CO alarm should be going off because it's somehow showing positive draft pressure, not negative.

Paul

Ta Paul, leveled and zeroed. Now what should I do? See attached picture. The stove is idling at the moment though.

image.jpg

image.jpg

Idling at .04 for how long ? Does the mano reading drop over say the course of an hour at idle ?

For a 75K BTU stove .04 seems a bit high for what I would consider idling, but that's my guess based on a different stove and chimney system. What you need to find is, is that really idling for your system.

In other words is that as slow as the stove will go-temp wise- but easily maintain that low temp without slowly going even lower????

Try moving the baro weight to let the baro butterfly valve tip a bit more and let in more room air. See if the mano drops then remains steady at a lower point and the stove temps stay constant also. Again, your looking to adjust dampers and baro for the lowest steady mano reading while the stove is putting out the heat you need for comfort at the lowest pipe/chimney system temps. That's your "sweet spot" for both the mano and the baro.

Paul

Looks like you're on your way Craig

Mike

Nice job Craig Don't get too consumed with it. Adjust the baro so that you get a steady draft of -.03 to -.04.. You'll find that during cold outside and hot fire, the mano will read a little higher and that during moderate temps outside with an idling fire it will read a little lower. As long as your mano don't fall below -.02 and don't go higher than -.05 yer golden. You may see fluctuation above .-05 during heavy wind gusts but this is normal and to be expected.

Tweak and experiment over the next several days, take notes on observations like Paul said..

michaelanthony wrote:Looks like you're on your way Craig

Mike

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Ta Gents,

It is not that cold here at the moment. I am waiting for that to come so that I can really see what this thing can do.

As stated earlier, on what I think is idle, the room temp is 29*C which is about 84*F. I will need to turn it down to see how low I can idle before it goes out.

I left the baro alone last night after I got everything installed properly. The mano lifted to ~0.035, when I loaded (small load and not primary air change) and settled down again at ~0.03. I am just going to leave it for now until we get some cold weather.

Cheers

Craig

That's perfect. What's the barometric door doing?

Craigza wrote:Ta Gents,

It is not that cold here at the moment. I am waiting for that to come so that I can really see what this thing can do.

As stated earlier, on what I think is idle, the room temp is 29*C which is about 84*F. I will need to turn it down to see how low I can idle before it goes out.

I left the baro alone last night after I got everything installed properly. The mano lifted to ~0.035, when I loaded (small load and not primary air change) and settled down again at ~0.03. I am just going to leave it for now until we get some cold weather.

Cheers

Craig

Yup. Cold weather will change how the stove responds, so you might as well wait and see.

Paul