HomeRoast Digest


Topic: Fwd: Re: Re: +Roasting the Panama Carmen Estate (34 lines)
1) From: Howell Ite
Larry,
   
  Thanks for the information.  I will try using a third stage temperature 20 degrees lower and see if it works.  
   
  Paul
Larry English  wrote:
  From: "Larry English" 
To: homeroast
Subject: Re: Re: +Roasting the Panama Carmen Estate
Date: Wed, 14 Jun 2006 21:43:30 -0700
Howell,
  No, no!  The unit is not defective.  You haven't really told the unit to lower the temp by changing from 405 to 395 - it doesn't really work that finely, but needs a little more difference in the programmed temps.  I have a profile that changes from 400 to 380 for 30 seconds and then back to 400, and the fan kicks in for 30 seconds, right on cue - which is what I was after.  The temp reading on the unit drops quit a bit during that 30 seconds.  I would recommend that you use 20 or 30 degree steps in your program.  
  On the iRoast2, the first 3 minutes are always fixed at about 350, no matter what you program, but I'm not sure about the iRoast1.  You can test it by setting up a program at 400 degrees for more than 3 minutes and see if the fan drops speed at the 3 minute mark.  If so, you can get a free program step - e.g. 400 for 4 minutes gives you 3 mins at 350 followed by 1 min at 400, using only the first step of the program.
  Also, you are reading temps down where the air is being heated, not in the beans.  If you were to insert a thermocouple and measure temps in the bean mass, you would see some interesting things happening - e.g. bean mass temp will continue to rise during the roast even as the onboard temp reading remains constant.
  It may take a couple of months to master the iRoast - took me at least that long, even with the help of several folks here on the list.  Good luck,
Larry
  On 6/14/06, Robert Adams  wrote:        Howell,
  The i-roast tries to maintain temp by increasing fan speed if temp exceeds input. At this profile is this happening as roaster hits third stage? I've never tried a profile that lowers temp in third stage--maybe build-up of heat and chaff is leading to difficulty getting the temp down. However if the fan is not kicking up when reported temp exceeds input it is a defective unit, imo.
  Bob


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