The KN-8828B-2K gives the user two choices of profiles when roasting: 
    AUTO MODE: Auto mode uses a factory programmed roast profile that lets the user start the roast and let the roaster use its factory programmed curve to roast the coffee. 
    MANUAL CONTROL: Manual control is available to the user who wishes to control various parameters during the roast. The fan speed and heating element power are the primary adjustments available. These can be adjusted any time after the 'Add Beans' signal sounds. Additionally, the Target Time and the Target Temperature can also be adjusted before starting the roast or any time during the roast, but generally these would not be used when manual control is desired.

    At the end of any roast, the user can save the completed roast to their choice of one of the three memory locations. That saved roast can then be recalled in the future. Saved roasts can be overwritten with a subsequent roast. The internal memory is non-volatile so the roast profile will not be lost when the roaster is unplugged from the outlet.


    One way to make use of the B-2K's ability to be controlled manually is to begin with a "blank roast profile." The following guides you through creating a "blank" roast to use as the basis of a Manually controlled roast profile

  • Select "AUTO" 

  • Set the Target Time to maximum and the Target Temperature to maximum

  • Start a roast

  • When the add beans signal sounds do not add beans. 

  • Once the "Add Beans" signal ends, change heat setting from 10 bars to 9 bars, then change it back after about five seconds or so. Repeat that with the fan speed, changing it from 0% to 25% then after a few seconds back to 0%. Watch the display, and if the AUTO program tries to change a parameter, set it back to the previously described settings.

  • Let the roast continue by pressing a button if it beeps a warning.

  • Now, I cannot remember specifically, but there is a minimum time or temperature that this empty roast has to run before it can be saved at the completion of the roast. So let it get to around 340 0r 350F.  and then hit eject (it does not save the eject button press). At the end of the cooling cycle it should allow you to save it to one of the three memory locations.

Now you can use this as a manual roast program which is basically 'blank.'

WARNING: I am finding that the newer models of roasters, even with 250 grams or more, are capable of achieving rolling second crack at well under 400F. If you create a program that allows the roaster to get to high temperatures or one that allows long roast times after the last warning beeps and you allow it to continue, it is possible to cause damage to the roaster and/or property. In extreme cases, bean ignition is a possibility. 
Never leave an operating roaster unattended! As with ANY coffee roasting appliance from ANY manufacturer, coffee roasters do not catch fire. Coffee beans and chaff catch fire. It is up to the user to roast carefully and safely. Every Hottop roaster we have seen that has suffered an ignition event was caused by user error or neglect.