Operating instructions

Getting the Most From Your KN-8828B-2K

The KN-8828B-2K allows the user to adjust the power of the heating element as well as the speed of

the fan throughout the roast. This section is designed to show you how to use this control to more precisely

tailor the roast. The information contained in this section will also interest the users of the KN-8828P-2K

Over the years, roasting theories concerning proﬁles have changed. A lot of that has been driven by

the amount of control the user has over the appliance they are using. Up to this point there have been few

home roasting devices that allow the user to control the roaster precisely. The

KN-8828B-2K

changes that.

During the roasting process the coffee undergoes a number of dramatic changes, and if the user pays

close attention, these changes will act as indicators and allow you to more-precisely control the roast. The

beans go through a number of color changes (see page 13), and even changes in their size. Chemically,

certain elements in the bean are changed, and at one point near the end of the roast the beans are actually

creating heat energy! As you become more familiar with those changes you will be able to predict what

you need to do. As with all electrical heating devices, there is a bit of lag time between making a change

in the heating level and the actual change in the environmental temperature, and the knowledge presented

here will help you predict when to make changes using the control panel of the KN-8828B-2K.

Refer to the following graph and read along, Highlighted red numbers in text “(

1)” refer to the black

highlighted numbers in this graph:

This RED line data was taken from the LED display on the KN-8828B-2K. That is the temperature

which you will refer to when roasting. The other temperatures are from an after-market digital thermometer

added to our KN-8828B-2K test unit for the purpose of gathering the information for this graph. The BLUE

line is bean temperature from a probe in the bean mass itself, and the GREEN line is a thermo-sensor in

the hot air, in the drum, near the top of the roasting chamber. “Time” started when the beans were added

to the roaster. Note that all times and temperatures are for general reference only. Your results will vary

depending on various factors such as bean moisture level, air temperature, voltage supplied to the roaster,

amount of beans being roasted, condition of main ﬁlter, etc.