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Thread: charge temperature using Hottop

  1. #1
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    charge temperature using Hottop

    Hi Coffeesnobs,
    I have only done a dozen or so roasts with the Hottop KN-8818B-2K. Previously I had only roasted in a popper so I'm new to profiles.
    The Hottop just about makes you use a 75C charge temperature. After multiple undrinkable roasts using 75C charge temperature (including Auto mode which produced such disgusting coffee that I only used it once) I changed to 125C then 140C charge temperatures and the results were pretty good. I used similar heat and fan settings through the roast and aimed at a temperature rise of around 5 seconds per degree C.
    I've read that the heating before yellow doesn't have any effect on the finished results, so it's hard to see why the different charge temperature made so much difference.
    I wonder what others have experienced with this roaster, and what charge temperatures you use?
    Cheers

  2. #2
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    I also have come to use a charge temp of 140, Keep it on full power until yellow then reduce heat to 8 or 7 with the aim of slowing the temp rise down to 6 deg per min by first crack. Try to hold temp rise at 6 deg per min until drop. Tends to stall a bit early in first crack then temp is prone to bolting after first crack. Takes a bit of anticipation as it takes a little while for the beans to respond to a change in heat setting. I reduce the heat setting to about 6 as the temp starts to pick up following first crack. I have noticed that ambient temperature makes a bit of a difference.

    Tony

  3. #3
    Senior Member greenman's Avatar
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    Quote Originally Posted by Tony_Allwright View Post
    I also have come to use a charge temp of 140, Keep it on full power until yellow then reduce heat to 8 or 7 with the aim of slowing the temp rise down to 6 deg per min by first crack. Try to hold temp rise at 6 deg per min until drop. Tends to stall a bit early in first crack then temp is prone to bolting after first crack. Takes a bit of anticipation as it takes a little while for the beans to respond to a change in heat setting. I reduce the heat setting to about 6 as the temp starts to pick up following first crack. I have noticed that ambient temperature makes a bit of a difference.

    Tony
    Ideally you need to approach first crack with enough momentum so that you get a vigorous first crack going and then ramp down the temperature to reach the roast level required. If you stall the roast this will have a marked affect on the result. Haven't used a Hottop but these principles should apply. Good luck with your roasting.
    coffeechris likes this.

  4. #4
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    Behmor Coffee Roaster
    Thanks Greenman. As there is a bit of a lag time before the heating element adjusts to a change in heat setting I find it is a bit of a fine line in hitting first crack with enough momentum to carry through and hitting it too hot and then having the roast race away after first crack. While I've been roasting with the Hottop for several years and am still learning little things about the process and I'm sure I still have room for improvement.

    Tony
    greenman likes this.

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