HomeRoast Digest


Topic: Fwd: scorched coffee (2 msgs / 34 lines)
1) From: Jeffrey Kelly
The only time I have experienced scorching with my GC is when the chaff sweeper was misaligned and did not do its job.  If the exit vent does not get cleared once per drum turn after start of 1C, bean temperature can spike in the drum and not show on the temp reading.  Watch the vent and be sure the sweep totally clears the vent.  Burned chaff build up (excessive) on the vent is a bad sign.
Other thoughts related to air flow:  have you cleaned the chaff screen lately?  The holes might not look dirty but they slowly get caked with solids and flow inches lower.  How many roasts with your GC?   Could the fan be weak?
Good luck with your roasts...let us know how you do.
-JD Kelly
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2) From: Jeffrey Kelly
I almost always set to 473-476 with a pre- heat or back to back roast.  I reach 1C In the 9-11 minute range, this is usually real close to when the air in the drum has just reached 473.  Basically, I am heating full- on from start of roast to 1C.  I dial back the temp about 30 seconds into the crack.
I've dabbled in some profiles with ramps and isothermal holds but usually run a basic heat full throttle and then back off at the top...tastes better to me.
-JD Kelly
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