HomeRoast Digest


Topic: broken behmor question (19 msgs / 416 lines)
1) From: Benjamin Morgan
Hi List,
So a few years ago, I set my Behmor roaster on fire when I left coffee in it
for too long. Since then the electrical and mechanical components work fine,
but since the inside is so blackened  and believe me I have scrubbed and
scrubbed  it won't fully roast batches! I think it doesn't reflect heat
efficiently any more and the roast always stalls and goes into cool-down
mode way too early. (Sometimes before hitting first crack, I think.)
My question is: is there any way to hack the Behmor to keep the heating
element on all the time no matter what? I recognize that my history with the
machine makes this sound like a terrible idea but I promise to stay by it
and be careful. I have only basic mechanical skills but I'm intrepid and
don't have much to lose by pulling the thing apart. If not, I think I'll
just have to throw the thing out, which is sad because everything still sort
of works. =
Thanks
Benjamin
Homeroast mailing list
Homeroasthttp://lists.sweetmariascoffee.com/mailman/listinfo/homeroast_lists.sweetma=riascoffee.com
Sweet Maria's Forum
Our new Coffee Library

2) From: Ira
At 12:13 PM 4/20/2012, you wrote:
<Snip>
You can add a switch to bypass the relay that controls the elements. 
That's 117 so be careful or you can find the sensor on the 
electronics side by the 3 screws in the right rear corner and pull it 
free so it stops trying to regulate the temperature.
You should also try oven cleaner and/or rubbing compound, especially 
by the 3 screws in the right rear corner.
And if you decide to give up and toss it, I'll be happy to take it 
off your hands. I've been looking for one to tear the electronics out 
of and convert to manual for a while.
Ira
Homeroast mailing list
Homeroasthttp://lists.sweetmariascoffee.com/mailman/listinfo/homeroast_lists.sweetmariascoffee.comSweet Maria's Forum
Our new Coffee Library

3) From: j3r
On 12-04-20 03:13 PM, Benjamin Morgan wrote:
<Snip>
 it
<Snip>
ne,
<Snip>
nd
<Snip>
the
<Snip>
ort
<Snip>
This may be something you have seen, but behmor recently updated their =
"update" docs - all the maintenance here is worth trying before chucking =
ithttp://www.behmor.com/docs/updates_1_2_and_3.pdfAn easy one is make sure you are not using an extension cord or anything =
that could cause voltage to drop.
Jeremy
Homeroast mailing list
Homeroasthttp://lists.sweetmariascoffee.com/mailman/listinfo/homeroast_lists.sweetma=riascoffee.com
Sweet Maria's Forum
Our new Coffee Library

4) From: Frank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5) From: John Nanci
And it could also be that the thermistor has degraded.  It can happen 
over time and replacing it is possible.
John
At 10:14 AM 4/23/2012, you wrote:
<Snip>
Homeroast mailing list
Homeroasthttp://lists.sweetmariascoffee.com/mailman/listinfo/homeroast_lists.sweetmariascoffee.comSweet Maria's Forum
Our new Coffee Library

6) From: peter zulkowski
I have had great luck cleaning with Dawn Power Dissolver, even when oven
cleaner would not work. Shines up that stainless nicely. Loosens it so you
can scrape it off easily if it does not dissolve it.
Good luck,
PeterZ
On Mon, Apr 23, 2012 at 2:47 PM, John Nanci wrote:
<Snip>
Homeroast mailing list
Homeroasthttp://lists.sweetmariascoffee.com/mailman/listinfo/homeroast_lists.sweetmariascoffee.comSweet Maria's Forum
Our new Coffee Library

7) From: Benjamin Morgan
Thanks for the help, everyone. You guys are great! On the advice of one of
the list members, I unplugged the yellow and red wires from the PCB, put the
red where the yellow was, and left the yellow one dangling. I guess this
disconnects the temp probe and makes it run at full power. Worked like a
charm for 9oz of decaf. I'm waiting on more beans so I can test it, but this
seems like a good workaround. Cannot believe that I've been stovetop
roasting with a whirley-pop for two years when all I needed to do was move a
couple of wires!
Benjamin
Homeroast mailing list
Homeroasthttp://lists.sweetmariascoffee.com/mailman/listinfo/homeroast_lists.sweetmariascoffee.comSweet Maria's Forum
Our new Coffee Library

8) From: John Nanci
Yep, what that does is trick the system into thinking that the 
roaster is cool, so it keeps the elements on all the time....at the 
expense of any and all automated control or profiles.  Moving the 
yellow wired thermistor to the open portion of the wall bracket is a 
variation of that with the partial benefit of keeping 'some' profiles 
- it's basically cooling the thermistor a bit but putting it farther 
away from the heat source, thus letting/forcing the element to get 
and stay hotter.
John
At 10:32 AM 4/24/2012, you wrote:
<Snip>
Homeroast mailing list
Homeroasthttp://lists.sweetmariascoffee.com/mailman/listinfo/homeroast_lists.sweetmariascoffee.comSweet Maria's Forum
Our new Coffee Library

9) From: Ira
At 11:35 AM 4/24/2012, you wrote:
<Snip>
That's not true. it still follows the profiles, it just never turns 
off the elements due to the temperature in the chamber reaching the max.
Ira
Homeroast mailing list
Homeroasthttp://lists.sweetmariascoffee.com/mailman/listinfo/homeroast_lists.sweetmariascoffee.comSweet Maria's Forum
Our new Coffee Library

10) From: John Nanci
That is an interesting way to look at it.  That the profiles work but 
the elements don't turn off.  Sounds like the profiles don't work if 
the elements don't turn off :)
Sure, I guess it can be said it tries to follow the profiles, but the 
result is P1 (with no temp limit) all the time.
At 02:26 PM 4/26/2012, you wrote:
<Snip>
Homeroast mailing list
Homeroasthttp://lists.sweetmariascoffee.com/mailman/listinfo/homeroast_lists.sweetmariascoffee.comSweet Maria's Forum
Our new Coffee Library

11) From: Ira
At 10:44 AM 4/28/2012, you wrote:
<Snip>
When I run my roaster with the door open and a fan blowing in so it 
never heats up the elements cycle according to the profile but they 
never turn off because the chamber reached the max temperature.  Are 
you sure disconnecting the temperature sensor disables the profile 
percent cycling as my tests show it doesn't.
Ira
Homeroast mailing list
Homeroasthttp://lists.sweetmariascoffee.com/mailman/listinfo/homeroast_lists.sweetmariascoffee.comSweet Maria's Forum
Our new Coffee Library

12) From: Doug Grove
My understanding (and presumably Ira's) is that the profiles are not
regulated by the
temp. sensor.  They are simply a % power.   The elements cycle on and
off to achieve
the lowered power.  So during the 70% portion of a profile the
elements would be on
70% of the time.  The effect of the temp cutofff is just to prevent
the chamber temp
from exceeding a certain max temp.    So if it's an "on" time interval
for the element
but the max temp is exceeded it won't come on.
Did this make any sense??
I haven't fiddled with the internals, so don't know how it "really"
works, but this has
always been my understanding and is consistent with my experience in using =
it.
Doug
On Sat, Apr 28, 2012 at 10:44 AM, John Nanci  wr=
ote:
<Snip>
he
<Snip>
ult
<Snip>
is
<Snip>
 and
<Snip>
tmariascoffee.com
<Snip>
/a>
<Snip>
mariascoffee.com
<Snip>
a>
<Snip>
Homeroast mailing list
Homeroasthttp://lists.sweetmariascoffee.com/mailman/listinfo/homeroast_lists.sweetma=riascoffee.com
Sweet Maria's Forum
Our new Coffee Library

13) From: John Nanci
Ira,
I think we are not communicating some idea here, because I hear you 
contradicting yourself, and I doubt that is your intent.
<Snip>
This makes no sense.  The elements cycle BY turning off.  You can't 
have them cycle and not turn off.  It's mutually exclusive.
It's like saying you press the accelerator of your car all the way 
down, all the time, but slow down by taking your foot off the gas 
while your foot is still stays all the way down.  This isn't a 
quantum roaster (i.e. you can't have it control and not control at 
the same time - it's either or).
What am I misunderstanding in what you are saying?
John
At 12:57 PM 4/28/2012, you wrote:
<Snip>
Homeroast mailing list
Homeroasthttp://lists.sweetmariascoffee.com/mailman/listinfo/homeroast_lists.sweetmariascoffee.comSweet Maria's Forum
Our new Coffee Library

14) From: John Nanci
Ah.  If that is what Ira means, then, no, to my knowledge and 
experience it's a mis-interpretation of the manual.  70% is not 70% 
on/30% off.  It's heating until it is 70% of the maximum temperature.
I've checked with Joe, and he confirms this...but I've been wrong 
before, but it is my remembered experience.
John
At 01:02 PM 4/28/2012, you wrote:
<Snip>
Homeroast mailing list
Homeroasthttp://lists.sweetmariascoffee.com/mailman/listinfo/homeroast_lists.sweetmariascoffee.comSweet Maria's Forum
Our new Coffee Library

15) From: Rich
It would be nice if the actual code was available so these questions 
could be answered. Foe example, is 70% power controlled by a setdown in 
the cavity temp sensor trip point or is power cycled to the heating 
lamps for a 70% duty cycle?
On 04/28/2012 03:11 PM, John Nanci wrote:
<Snip>
Homeroast mailing list
Homeroasthttp://lists.sweetmariascoffee.com/mailman/listinfo/homeroast_lists.sweetmariascoffee.comSweet Maria's Forum
Our new Coffee Library

16) From: Ira
At 01:11 PM 4/28/2012, you wrote:
<Snip>
This is not the way it works, it's 70% on and 30% off at a 70% part 
of the cycle and the RTD turns it off whenever the max temp is reached.
Ira
Homeroast mailing list
Homeroasthttp://lists.sweetmariascoffee.com/mailman/listinfo/homeroast_lists.sweetmariascoffee.comSweet Maria's Forum
Our new Coffee Library

17) From: Ira
At 03:12 PM 4/28/2012, you wrote:
<Snip>
70% means 70% on and 30% off in a 15 second cycle or something not to 
far from that. It's been a long time since I ran the tests. It has 
nothing to do with temperature and as far as I know, the probe in the 
right rear is used both to keep the roaster from stating when hot and 
to turn off the elements if the temperature passes whatever the max 
allowed temperature is.
You don't need the code, it's trivially easy to prove by experimentation.
Ira
Homeroast mailing list
Homeroasthttp://lists.sweetmariascoffee.com/mailman/listinfo/homeroast_lists.sweetmariascoffee.comSweet Maria's Forum
Our new Coffee Library

18) From: Rich
I know it can be picked apart by experimentation, or in the more 
technical term, reverse engineering. Being somewhat lazy it is simpler 
to just sit quietly reading the code and sipping good coffee though.
What you are describing as the operating cycle is what I remember from 
the initial runs that I made when it was brand new fresh out of the box 
as well.
On 04/29/2012 12:30 AM, Ira wrote:
<Snip>
Homeroast mailing list
Homeroasthttp://lists.sweetmariascoffee.com/mailman/listinfo/homeroast_lists.sweetmariascoffee.comSweet Maria's Forum
Our new Coffee Library

19) From: John Nanci
I tried this out this morning.  I hereby stand corrected - you are 
right Ira - it cycles, turning off the elements at proscribed 
times.  So, only on P1 does it stay on fully.
John
At 10:30 PM 4/28/2012, you wrote:
<Snip>
Homeroast mailing list
Homeroasthttp://lists.sweetmariascoffee.com/mailman/listinfo/homeroast_lists.sweetmariascoffee.comSweet Maria's Forum
Our new Coffee Library


HomeRoast Digest