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Topic: Behmor chaff fire (9 msgs / 155 lines)
1) From: Brad Baker
I have been chaff fires recently.  I roast 1LB batches.  If a fire
occurs it usually will occur after the beginning of 1st crack but
before it ends. I really dislike cutting off the roast prematurely but
that is how it is.
Any suggestions on how to minimize this problem?  Perhaps smaller
batches, other profiles (I use P1 and P3).
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2) From: jeff michel
Are you cleaning the oven really thoroughly between roasts?
I use a shop vac and get all the little particles out.
Jef
On Mar 1, 2009, at 11:23 AM, Brad Baker wrote:
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3) From: Sandy Andina
I'd definitely try smaller batches and make sure the interior of the  
roaster is clean and shiny. Use the right size mesh drum for your  
beans--a small or irregular bean will fall through the larger mesh,  
and the beans on the floor of the roaster will not be moving and thus  
their chaff may be likelier to catch fire. And brush out the roaster  
thoroughly after every roast--old chaff will catch fire before new  
beans even release most of their chaff at first crack.
On Mar 1, 2009, at 1:23 PM, Brad Baker wrote:
<Snip>
Sandy Andina
www.myspace.com/sandyandina
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4) From: Seth Grandeau
Give the drum a good shake, before roasting (or run it in cool down mode for
a few minutes) to shake out any small or broken beans.  That will cut down
the number of beans dropping out during your roast.  Other than that, i
agree with Sandy's suggestions.  By the way, if after a roast you are left
with a dark spot on the chaff collector, use some polishing compound (I use
Bon Ami) to clean it off completely.  Otherwise, that spot will heat up more
and be more likely to cause future fire.
On 3/2/09, Sandy Andina  wrote:
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5) From: Rich
I only roast 1lb batches an roast into 2nd crack depending on the bean. 
  No fires.  What are you calling a fire?  One or 2 flashes of chaff 
burning, or a self sustaining glowing mass of beans.  A bit more 
information would help.
Brad Baker wrote:
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6) From: Brad Baker
On Mon, Mar 2, 2009 at 5:29 PM, Rich  wrote:
<Snip>
I vacuum after every roast.  Burn off every five.  This is my second
Behmor and I don't recall this problem with the first one, (though
there may be no relation there).
I see chaff flareups and a lot of smoke. No charcoal glowing  bean mass
however. The chaff fire continues to smolder and flare, traveling across the
chaff in the collector, all while in the middle of 1st crack.  My
preference is to take it to or slightly beyond the onset of 2nd crack.
I think I'd like to find a roaster with a better chaff collector
mechanism, but I don't know.
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7) From: Alchemist John
There is no reason to stop your roast prematurely.  The fires the 
manual speak of are bean fires.  Just keep roasting, keep an eye on 
it, and clean well afterwards.   Chaff fires are low energy and not a problem.
At 11:23 AM 3/1/2009, you wrote:
<Snip>
John Nanci
AlChemist at large
Zen Roasting , Hand Grinding, Blending & Espresso pulling by Gestalthttp://www.chocolatealchemy.com/Homeroast mailing list
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8) From: Brad Baker
On Mon, Mar 2, 2009 at 9:59 PM, Alchemist John
 wrote:
<Snip>
ean
<Snip>
Fantastic.  I will carry on!
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9) From: Seth Grandeau
Are you using "chaffy-er" coffees?  It may also be that your current unit is
running hotter than the first one?  I've been playing around with using P5
for coffees I want to roast to C/C+, to get a slower profile and because I
like the way P5 finishes up at 95% power (it seems to cycle faster, holding
a more constant temp).  You could try selecting P5, cut the time down to
1:00 (before hitting start), then bump it back to your target time (after
hitting start).  That will give you a P1-like profile, but ending at 95%,
rather than 100% power.  You can definitely hit 2nd crack on p5, given
enough time.
On 3/2/09, Brad Baker  wrote:
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