Wadhams Ironworks wrote:VigIIPB, was the -0.095 iwc reading that you measured at the seconday taken with it closed?
I have to say that I always keep my secondary cracked open about 1/8". I did notice recently some obstructions in the secondary port. It was a surprising amount of unburnt, rice sized flakes. I assume that they come from the over spill that lands above my damper when I fill the stove. I imagine that the closing damper causes any ash and small pieces of fresh coal to fall behind the damper. I feel that there is a small gap between the upper fireback and the back plate that allows for this to happen. Granted this was after approx. 4 years of operation that this path became obstructed. I am of the opinion that the secondary is a function better suited for bit burners but I do also feel that it serves to improve the combustion of the gases as they snake up the back of the vigII. I do not use a rear heat shield an I feel that I get slightly higher temps on the back of the stove with the secondary open about 1/8". Food for thought.
To further clarify, this is the port where I measured the -0.095 iwc. I measure the iwc with the open port fully plugged with a shaped rubber plug that I've inserted the manometer tube through. When I take the reading, it's plugged except for the flow through the manometer.
When I've opened the secondary port even a little, I see my thermostatic flap open more meaning the stove has cooled and the system is attempting to increase stove temperature. My thoughts & observations lead me to conclude leaving it open just siphons off draft that would normally pull up thought the coal bed aiding combustion and not be negated by the open port sucking ambient air up the chimney. Kind of like what happens when one of the clean out covers falls off and pulls draft away from under the grates. That's why i keep it closed.
I can't say for certain but I don't believe it's possible to create combustion in the side chamber with ambient temperature air entering into the lower part of the left side chamber. First, the air isn't passed through superheated chambers before it's introduced into a gas mix that is of questionable concentration to reach it's flash/combustion point. The air that makes it in through the door/glass joint is more properly conditioned and positioned to have a greater effect. Also, the restirctor plate is removed for ant burning allowing for more under fire oxygen supply. I feel the secondary port is analogous to a vestigial tail ... it was there for something a long time ago but has passed its design use - if
it ever had one. I don't think it was even that useful in the original wood burner design from whence the outside panels came to be used in the 2310 version. If you have access to an IR gun, check the operating temperature of the stove back over a period of days/weeks and let us know if you see a variation in open vs. closed. It's interesting to know rather than try and figure if there's value or loss achieved by using the port.
The only obstruction I ever see at the secondary air inlet is some fly ash build up. Nothing too great. I've never seen fines build up anywhere past the sides/back of the fire box. It almost sounds like some part isn't fitting properly. I've had the sides of the stove removed and can't quite see how anything can get in there unless it spills over the brick into one of the side exhaust ports. I have found pieces of coal that made it into this chamber in the fly ash when I clean the fly ash out from the three clean out ports located just under the grates. I always shovel off the bottom of the bin and have plenty of fines in each hod. I rarely miss the firebox and get fines on the smoke shelf/damper when I dump the hod into the firebox. Pieces of nut or pea will land back there but I reach in and move them to the fire.
vmi1983 wrote: ..8<..
The design of the Vigilant allows for some amount of air to enter the slits and go over the blue ladies. to complete secondary combustion
Geez, it's not explained in the operator's manual. What do you think (know)?
My friend Wadhams Iron Works, (we both live in Wadhams, NY) put in the angle bricks at noon. We kept the fire going but has taken some time to reestablish the fire. Good news is this stove has been burning continuously since mid-november. Yep it has been cleaned out. It had bricks removed and angle bricks installed, and yet the mighty VigII keeps burning away.
No, they never mention the gap in the manual. They must have overlooked it. I actually looked for it after reading in this forum about Harmon stoves introducing over fire air via this same gap. Found it in the 2310 too. I wonder if it's truly a source of secondary air or is the glass installed this way to allow the glass to expand into an unrestrained expansion zone. For all I know, it's likely to be both
The steeper slope on the angled filler bricks is a good idea. What are they 'cast' from? I'd replace mine with something of this design. Right now, mine are nothing more than broken pieces cemented into place with furnace cement. Last repaired them 3 years ago and they've held up since. When it's time to redo them, I'll look into steeper replacement. Wanna sell a pair