I've been roasting on a Diedrich IR-7N for the past couple of weeks and am having trouble creating a good profile....I've been roasting an Ethiopian Kaffa Forest from Atlas Coffee Importers in Seattle.
I'm roasting at about 5,300 feet elevation in dry colorado air.
Started off following manufacturers recommendations....Here's a breakdown of my 1st couple 5lb roasts
#1
Gas on WC meter: 2
Charge Temp: 422
Drop Temp: 225 (forgot to log)
Air 50/50 280degrees: 2:27mins
1st crack (switch to roasting thru Drum): 390 (forgot to write time as I knew it happened way too quick!)
Roast finished: 425 in 7 minutes!!
#2
Gas on WC meter: 1.25
Charge Temp: 402
Drop Temp: 203 @ 1:20mins
Air 50/50 280degrees: 3:50mins
1st crack (switch to roasting thru Drum): 385 @ 9:40mins
RAMPED UP gas to 1.5 @ 12:40 mins since it wasn't climbing
Roast finished: 422 in at 16:09 which is an insanely long roast development stage.
#3
Gas on WC meter: 1.5
Charge Temp: 418
Drop Temp: 213 @ 1:20min
Air 50/50 280degrees: 3:12mins
1st crack (switch to roasting thru Drum): 390 @ 7:25
Roast finished: 423 @ 10:25mins
#4
Gas on WC meter: 1.4ish
Charge Temp: 420
Drop Temp: 211 @ 1:27min
Air 50/50 280degrees: 3:20mins
1st crack (switch to roasting thru Drum): 390 @ 7:43
Roast finished: 422 @ 11:00mins
#5
Gas on WC meter: 1.4ish
Charge Temp: 383 (was trying to slow roast down, this way....good idea??)
Drop Temp: 209 @ 1:18min
Air 50/50 280degrees: 3:13mins
GAS LOWERED to 1.25 @ 3:33mins
1st crack (switch to roasting thru Drum): 383 @ 10:45mins
ROASTING seem to stall at 383 so I brought gas up to 1.5 @ 11:15mins then 3 @ 12mins and then to full bore which is a 6 @ 12:30mins
Roast finished: 423 @ 15:25mins
#6
Gas on WC meter: 1.4ish
Charge Temp: 377 (was trying to slow roast down, this way....good idea??)
Drop Temp: 195 @ 1:30min
Air 50/50 280degrees: 4:07mins
1st crack (LEFT AIRFLOW AT 50/50 to try for a steady climb???): 383 @ 9:35mins
Roast finished: 422 @ 13:10mins
I'm having a hard time finding out the ideal way to create my initial profile.....seemed to get the steadiest temp climb leaving it at 50/50 from 280degrees on?? What sort of effect does this have on the beans??
Based on my numbers, what variable should I try changing 1st? At what roast stages should I be increasing the gas or decreasing?? From my very little experience, it doesn't seem like I'm gonna be to keep the gas steady throughout the roast??
Thanks in advance for any suggestions! I'm gonna be roasting again on Saturday and would love to have some new things to try!
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