Good Evening Greg, Gary & Matt,
Greg, thank you for the detailed reply in answering some of my questions and observations of my GW2014.
Unlike the West coast., 100% Douglas fir pellets here in Connecticut are far and few. What I have been using, as mentioned earlier, are the Purcell premium pellets variants which are the "Specially Formulated" "Fir" product and not the current packaging, which now lists as being a Super premium pellet listed as 100% Softwood made from Douglas Fir.
I am trying to learn the stove and the idiosyncrasies, by staying with one pellet that has been consistent and has shown the least amount of fly ash. I have tried others and as you mentioned, creosote becomes an issue as well as the ash.
Important to me, is to be able to have an overnight burn and then before heading off to work, rake the basket, then clear the secondary, empty the ash pan, top off the hopper and then off to work.
Right now, that is not going to happen. I have had about 4 successful overnight burns, but after a single 18 hour burn, I felt went backwards in being able to have extended burns.
By successful, I mean that I sent the stove with an indicated temp of around 600 with draft slide opened about 50% and the daisy wheel opened about 3/16" from it's minimum position.
On these burns, when I checked on the stove about 9 hours after the start, the temp had pony rolled back to 500, which I was happy to see, given earlier burns with different pellets and basket had the stove fall back to 300.
Those successful burns, where stove only lost 100 or so degrees from 9 hours of running, responded (climb back up to 600 temp) when I poked the basket, then pulled out & cleared the secondary, and then pulled the ash pan to empty. Did this to see it would recover on its own, without changing draft slide setting and only opening the daisy fully until it peaked , then put the daisy wheel back to 3"16" open.
Noticed in the ash pan, was the little square cake of ash that fell from the secondary when it was removed.
With the current pellets (part fir?) and checking the stove in the am after the overnight burn, the basket will have some areas that are dark and not glowing, so as many do I tickle the basket to drop the embers so that fresh pellets enter and the pellets in the basket are seen burning (glowing).
I have checked my basket for the spacing between the rods that make of the assembly. and currently they are running between .318 & .320. they are not running true so there is a little variation from one end to the other.
With the stove, I leave it set at 600 with the draft slide open about 50% when I go to bed. Check the stove in the am, obviously ash has collected on the secondary to cause a reduction in the temp as well as the clinkers that have formed in the burned basket. Clear both and stove is up an running again. (not checked is the deposits collecting on the walls of the feed tube above the burn basket/chamber)
Pellet consumption at best yielded a best of 10.9 hours, which is midpoint of the 10 to 12 hours for running on high.
Last nights burn, worked out to 4.66 lbs per hour and after shut the walls of the burn tube behind the burn basket and towards where the daisy wheel end of the chamber is, was all nice and shiny high gloss black of creosote, which I did not have with the 3 previous overnight burns using the same pellets and setting the stove at 600 indicated.
I have not tried burning at a lower temp ( say 400 - 450 ) as I have in the past, due to the creosote issues I had and didn't want to have a repeat of the lava flow again.
Removing the outside air from being directly connected help in that regards, but still gun shy.
I am at a loss to trying to get a longer burn without lowering the temp and bringing in issues of heavier creosote formations and any out flow.
I do not know how much of a correlation there is, for how much the daisy wheel should be open (to allow more air through the burn basket) when the draft slide has been open to lower the temp.
I find with setting at 600 for the overnight burn by having the draft slide open about 50%, the daisy wheel does effect your temp, like fine tuning. I can see an easy 25 degree change with opening in 1/8 to 3/16 increments.
This is where I have the Chicken and the egg discussion with myself to try and understand why the stove has a decrease in temp when checked after the overnight burn overnight.
Is it the formation of clinkers in the basket, that causes the ash to stay on the secondary plate because pellets aren't falling as quickly or in quantity to displace the ash sitting on the secondary.
And then you have the pellets that are above and on the sides of the burn basket that are sitting at the bottom of the feed tube. With things slowing down(?) they are sitting longer in those areas and are breaking down and charring before they even get into the burn basket. some of these are seen binding to one another while sitting there and you see the black flow from them.
I do not know how far up into the feed tube pellets start to breakdown, but it appears once the lower area at the bottom of the feed tube has the carbon/creosote forming on the walls and pellets stick, this starts the temp roll back.
I am hoping to get some 100% Douglas fir pellets to see how much improvement it offers, as the higher consumption and not being able to tap rack and go when I need to leave for work, will present issue of a cold house when winter come back around. Thats why I trying to get it learned before the season is upon us.
I have to agree with Matt about Draft and quality fuel. I believe my draft is fine, as even with 27' for 6" double insulated stainless pipe, I have never had any smoke issue on shutdown ,even when I have left the draft slide open 50%. Always positive on shut down.
I also believe that draft = velocity, that in order to have a good burn you have to have a good fuel and you need a minimum amount of air passing through the fuel for it to gasify and burn correctly.
So I am not sure if there is a sweet spot of a running temperature that provides a good compromise of fuel usage, temperature output and reduced formation of creosote and carbon buildup in the feed tube area near the burn basket. This is where I believe the composition of the pellets being used have an impact in the stoves' operation and burn. I believe some pellets will break down sooner with their exposure to heat while not in the combustion area of being in the burn basket. Too many of these pellets breaking down too soon above the burn basket leads to higher formation levels on the walls and will slow the stove. I could be incorrect, but it seems to be a viable thought to consider. There is also the ledge that is on both sides at the bottom of the feed tube. These hold pellets and I don't thing these can be dressed down as you may then compromise the weld in that area where the burn tubes sections were joined between the secondary burn and the main burn tube where the burn chamber sits under the feed tube.
I had given thought and even sketched out guides to fit over these ledges to form a sort of taper above (into the feed tube) and just below these ledges , which would allow the pellets to flow into the burn basket from the bottom of the feed tube without any pellets snagging on these ledges. Not sure if this would reduce any build up, but it is possible as well as directing pellets into the burn basket.
Not to mention whether these should be made from 304 or 316L stainless.Installation is easy enough as they are only the length of the ledges at the bottom of the feed tube.
I do not know if Gary or Matt had tried anything similar. For production it would be an increase in expense that's for sure due to being time consuming and the additional materials.
I love the idea of the Wiseway and like my wood stove, it's not reliant on electricity for its operation.
Just need to have the fuel usage be better and more importably, burn in such a way that I can clear the basket, clear the secondary and ash pan, top off the hopper and be able to go to work and still have heat in the house. Then when I come from work, shut it down till cool, clean and scrape the deposits in the feed tube walls, a quick vacuum in the burn tube, and start the burn again.
It should be attainable and I'm trying to learn but also trying to understand how things interact and how theses cause certain items to occur during extended burns.
Would be nice,that once the house is at a comfortable temp, to throttle back the stove to say 500 for the overnight burn, unless old man winter is knocking, then may have to leave it running at 600+ to maintain the house.
I know Paul Grant, who is also in Connecticut has been very successful with his Wiseway and I believe he have been running mostly Douglas Fir, and also I think was spruce for the shoulder parts of the heating season. Winters 2017/2018 will be my first season with the Wiseway, and not the wood stove I have used for the last 14 years.
Again, thank you Greg for sharing your experience and it showed that there are some items we've both experienced.
Gary & Matt, thanks for checking in on things posted here.
Respectfully,
Sterling