HomeRoast Digest


Topic: Behmor cleaning - air hose - NOT (8 msgs / 242 lines)
1) From: Michael Dhabolt
When I noticed an update to the preventative maintenance cleaning
procedure for the Behmor that was posted on the list a while back, I
forwarded it to Dan, a friend who has been using a Behmor for a couple
of years now.  He had previously accomplished the cleaning procedure
that involves removing the right side bodywork successfully.  This
time he wasn't as lucky.  His first post-cleaning roast was started
and he retired to the next room and his recliner with a kitchen timer
to alert him to go back to the roaster to monitor the last couple of
minutes of the roast.  Considerably before the timer alerted him, the
smoke detectors in the house started going off.  When he started
toward the kitchen he was confronted by a solid wall of smoke - -
unplug the Behmor (do not open door of roaster) - start whole house
ventilation - open windows - move roaster outside - phone Mike (me).
I was in the middle of a service call working on a 'rode hard and put
away wet' twenty year old two group HX machine at an Espresso Shop
that was spewing hot water and steam in several different directions,
so I told him I would call back as soon as I got the business back in
functional shape.
When I called back about an hour later he was in the process of
cleaning the kitchen; washing walls, moving refrigerator etc.  He had
already gone onto the SM site and ordered a new Behmor and was
considering whether the microwave/vent hood over the kitchen range /
roasting location should be replaced.  Dan has just recently
accomplished a major kitchen remodel (including a new LM GS3
(jealous)) and may be going a bit overboard on this cleanup.  He
commented that he just "couldn't deal with the burnt, oily smell".  I
told him to clean the grease screens from the microwave / vent hood,
wipe it down with Simple Green and leave the fan running for a day
before deciding to replace it.  Now Dan may have over-done the
emergency response a bit but the realization that a fully functional
roaster had become an important enough part of his life that ordering
a new unit was an immediate decision.
After the flap was over I queried him about how he accomplished the
recommended cleaning.  He had removed the required sheet metal,
brushed out and vacuumed the areas identified in the maintenance
addendum to the Behmor manual.  This would probably have been
sufficient.  He followed this up with a thorough Simple Green clean up
of the area followed by a wipe down a drying.  This, also, was
probably not a problem unless he sprayed the Simple Green into
locations that could have caused problems with the circuitry.  He then
decided to (and accomplished) a thorough blow down with a 90 PSI air
hose.  At this point, I believe this is probably what generated the
problem - I'll know more after dis-assembling and testing the roaster.
 Initial visual inspection of the machine doesn't show any major
physical problems that a good clean up won't cure.  I'll do an initial
physical clean up and run it through a cleaning cycle or two and
finish up with another somewhat more thorough roast chamber cleaning
before going further into the machine.  I'll follow up on this thread
with whatever I figure out.  I'll call John for recommendations also.
Mike (just plain)
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2) From: Edward Bourgeois
Would suggest he have a comfortable chair in the kitchen so not to be
out of sight of the roaster in the future.
On Mon, Nov 2, 2009 at 1:51 PM, Michael Dhabolt
 wrote:
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ee.com
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Ed Bourgeois aka farmroast
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3) From: Rich
I clean mine out with 125psi air, have not broke it yet and it is one of 
the first batches that SM received.
Michael Dhabolt wrote:
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4) From: Jim Anderson
On Mon, Nov 2, 2009 at 10:51 AM, Michael Dhabolt
wrote:
 He then decided to (and accomplished) a thorough blow down with a 90 PSI
air
hose.  At this point, I believe this is probably what generated the problem
I have blown mine out with an air hose also. Are you thinking that some
chaff got blown into an area where it started burning?
Jim
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5) From: Michael Dhabolt
Rich,
After dis-assembling the Behmor I'll have to agree with you, I don't
think the air blow down had anything to do with the roasters problem.
I've removed all the exterior  body panels and accomplished a fairly
thorough interior cleaning. I then accomplished several cleaning
cycles: 1#, P1, D, +++++ (out to 20:30), [Start].  I couldn't come up
with an obvious cause for the problems that Dan experienced.
A phone call to our resident Behmor expert, Alchemist John, and a
review of the observed actions of the roaster during the cleaning
cycles convinced him that a circuit board replacement is called for.
His prognosis is based upon fan on/off timing during the roasting
cycle.  During dis-assembly the 'afterburner / smoke suppression
nichrome heater unit' came out with the ceramic part in pieces, so
replacing it is also necessary.
Everything taken into account, I'm more impressed than ever with the
fundamental robustness of the machine.
When the parts arrive and I've re-assembled and tested the machine
I'll post my results.
Mike (just plain)
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6) From: Bonnie Polkinghorn
Rich and all,
I'm not sure if it's becoming a pattern, or if it is coincidence, or
just an observation.
When I took apart my roaster to do this very cleaning, after I put it
back together, I ran a cleaning cycle, and somewhere along, the drum
stopped turning and I got some errors.  I needed to replace the
circuit board and fan motor as well.
One email to Behmor Support and the parts were quickly shipped to me.
I can tell you that all I did was take off the side, observe, and
maybe blow a little with my breath, I didn't use an air hose.  I
didn't have any build up on the fan blades, anyway.
When I started the cleaning cycle, I know the drum was turning.  I did
not sit around and watch the cleaning cycle as I somethimes do, since
I can be doing the dishes at the same time, but this particular day, I
was running around the house, listening more than watching, and when I
didn't hear anything, I noticed the errors.  When I tried running the
roaster again, the drum would not turn and they system would shut off.
 It was because the fan was not turning, so it turned itself off.
I'n hoping that telling my story can help you determine why, after
just taking off the sides, maybe blowing on the fan blades, putting it
back together, causes these issues.  My roaster had been perfect
before and still is after this issue.  I have one of the earlier
models, since I received it for Christmas that first year.  I had run
285 roasts through at the time of the big maintenance.
Regards,
-Bonnie P.
On Tue, Nov 3, 2009 at 9:47 AM, Michael Dhabolt
 wrote:
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7) From: Rich
My guess would be that the circuit board just picked that time to die. 
Possibly an aging drum motor could cause a low level overload on the 
board which will accelerate its demise but that is just conjecture.  I 
have replaced the afterburner and the drum motor.  I caught the drum 
motor as it was in its death throws so there were no errors.  This 
roaster is also out of the first batch into the country.  When I clean 
mine out periodically I use 125psi air and blow out everything.
Bonnie Polkinghorn wrote:
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8) From: Alchemist John
I would agree with that assessment.  The two occurrences are two 
different items.
In Mike Dhaholt's friends case, from everything I could determine via 
Q&A, the cleanout of the fan did exactly what it was supposed to 
do.  It allowed greater air flow out of the space where the circuit 
board and more importantly, the thermistor which controls the chamber 
temperature, and thus the roast profiles, are kept.  The whole reason 
behind this cleaning was a response to a 'working' roaster that was 
slowing lengthening roast times.  Basically, with debris inhibiting 
air flow, the thermistor stayed hotter than it was designed too, and 
cycled the system cooler to compensate.
So, once the fan was clean, the roast times where shorter than his 
friend had been accustomed too, and since he was not in attendance, 
the faster roast just got away from him.
Lesson - never leave your roaster.
Oh, and in this case, the circuit board is being replaced because of 
fire oils dripping onto the board causing some ilk of short 
circuit.  It might be cleanable, but replacement is so much easier 
and a surer thing.
At 04:16 PM 11/4/2009, 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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