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General Roasting Guide

 

 

Light

Medium

Medium dark

Development rate

10–18%

17–22%

>25%

Time

FC to FC+40s

End of FC to +1:30s

SC

Temp + FC (125 g)

4–8 °C

9–12 °C

+20 °C

Temp + FC (150 g+)

5–9 °C

11–14 °C

+20 °C

 

Default setting:

Start temp

183 °C

Power

60

Fan

30

Drum speed

70

Rule of thumb (normally):

Turning point should be around 25–40 s.

Begin – yellowing (“stage A”): 4:30–5:00

Yellowing – FC (“stage B”): stage A + 3:00

FC – finish (“stage C”): check table above

 

Procedures:

  1. 1.     Warm up at 202°C for 1 min.

  2. 2.     Set to 185 °C, let it reduce until 183–185 °C, hold for 1 min. Check if the air temperature is steady too.

  3. 3.     Insert beans and adjust power to 60.60

  4. 4.     When ROR = positive, adjust power to 90 to 100 (light roast = 100, medium roast = 95, dark roast = 90) OR the earlier the turning point, the lower the power is (e.g., 25s = turning point, power = 90).

  5. 5.     From 2:00 to 2:30, reduce power by 5.5

  6. 6.     When ROR begins to decrease, increase fan speed by 10 to make sure ROR steadily decrease (NOTE: increase fan speed may also increase ROR, keep an eye on ROR trend, reduce power by 5 if needed). Do this before yellowing (“stage A”).

  7. 7.     After yellowing (“Stage B”) + 20s, reduce power (by a step of 5) for steadily decrease in ROR (e.g., from 90 to 60 gradually)gradually). Reduce only if there is an upward trend >10 s. DON’T LET ROR TO CRASH.CRASH

  8. 8.     Before FC (FC minus 10°C, typically ranged from 185–195°C):

    • a.     Reduce power by 5 or 10, if there is any sign of ROR increase (=exothermic stage).. However, don’t let power goes below 60.

    • b.     Increase fan speed twice by 5 (total = 10).

  9. 9.     When FC is in progress:

    • a.     reduce power (reduce by 5).  For washed bean:bean: During FC, ROR may drop drastically. To fix this, increase power and rotation to 70+. 

    • b.     If it still increases, drum speed = 70+.

    • c.     If it still increases, fan = 50+.

    • d.     Then, reduce power stepwise by 5 until it’s finished.

      • 10.

  10. For medium and dark roast, final fan speed = [medium: 55, dark:60] + drum speed (70–80).

    1. Check table above for ideal roasting levels.
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