[Homeroast] behmor afterburner was: Behmor Fire

Doug Grove dgrove.wa at gmail.com
Thu Apr 12 14:08:44 CDT 2012


It was set to 125 before running - so around 121ish while running.  I
don't try to do profiling with the
variac, just set it then leave it alone.

On Thu, Apr 12, 2012 at 11:45 AM, Michael Baladi <mike at baladi.ws> wrote:
> Were you setting it to 125 volts while it was running (ie: elements on?).
>
> If so I wouldn't call that high-normal. 125 at rest is maybe a high normal, that would get you around 122 most likely while running. 125 with a 1500 watt load is definitely high and yes I believe that would burn out the afterburner prematurely. Once the mains kicked off on the cool cycle the afterburner would be running about 127 volts.
>
> If you are going to run a variac to the entire unit I'd recommend setting it to a nominal line voltage before you start and leaving it alone. If you split off the heater and connect them directly to the variac then you gain a lot more freedom to control the heat output without jeapordizing the rest of the electronics, however then you fundamentally changing the way the machine runs and disabling all it's safeties.
>
> Mike
>
>
> ________________________________________
> From: homeroast-bounces at lists.sweetmariascoffee.com [homeroast-bounces at lists.sweetmariascoffee.com] On Behalf Of Doug Grove [dgrove.wa at gmail.com]
> Sent: Thursday, April 12, 2012 2:25 PM
> To: A list to discuss home coffee roasting. There are rules for this list,      available at http://www.sweetmarias.com/maillistinfo.html
> Subject: [Homeroast] behmor afterburner was: Behmor Fire
>
> Hi Len,
>
> I repaired my afterburner at least 6 times before finally giving up
> and leaving it broken.
> Not having the afterburner running gives more power to the elements and shortens
> the roast time a bit.
>
> I suspect that is was my use of a Variac that caused the afterburner
> issues.  As near
> as I could figure out, it would blow out when the cool cycle came on.
> Perhaps too much
> power being directed to it at that time??  Not an engineer so have no
> clue if that's reasonable
> or not.  I only used the Variac since I have poor line voltage in my
> old house and only set it
> to around 125 V, which is high-normal ASFAIK.
>
> Doug
>
>
>
> On Thu, Apr 12, 2012 at 11:11 AM,  <Lalpern2 at aol.com> wrote:
>> On April 11,2012 at  2:41 PM, Bill wrote:
>>
>>>One oddity that I've noticed that I cannot explain, but seems to  repeat
>>>itself.....
>>>
>>>Roasting times seem longer during warm weather than during cold  weather.
>> It
>>>might simply be my imagination, but I doubt it. I find myself  hitting the
>>>cool cycle sooner during the winter than during the summer.  It might be
>> the
>>>case that the thermostat controlling the heat cycle is  tricked into
>>>overdrive by cold weather.... I don't know.
>>
>>
>>
>> Being of the engineering persuasion, and C/O (and maybe A/R), I've always
>> kept extensive notes on every roast I've ever done including the six
>> hundred or so using my Behmor.  I always record the ambient  temperature and have
>> noticed the shorter times to first  crack when the temperature is lower.  In
>> fact, I always estimate the  expected time to first crack based on previous
>> roasts and the current  temperature.
>>
>> I'm guessing that this is due to the longer on time of the heating elements
>>  to satisfy the thermostat at colder temperatures.  Since much of the heat
>> energy transferred to the beans is radiant, this shortens the time to first
>>  crack (and total roast time) for the same beans and roast profile.
>>
>> Maybe someone with technical expertise in the Behmor (Alchemist?)  would
>> weigh in on this phenomena.
>>
>> Speaking of the Behmor,  does anyone else find they need to  frequently
>> repair or replace the afterburner?
>> I've had to fix mine five times so far, with the nichrome wire opening up
>> right at the lug.
>>
>> Still like the roaster though, and the roasts it produces.  Almost  never
>> use my IR1 anymore.
>>
>>
>> Len
>>
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