Operation Manual

34
The temperature offset gives the user a convenient way to refer to the brewing temperature without doing
the math to figure out the difference between the displayed temperature and the brewing temperature, except
that temperature offset is not always a precise indication of the actual brewing temperature. There are a num-
ber of environmental and other factors which can affect the actual brew temperature, and thus the accuracy of
the offset. Factors may include:
• How long the machine has been on
• The temperature of the air around the group in the room in which it is located
• Air movement in the room caused by the number of people who walk past the machine while it idles
• Whether an air conditioner or a fan blows on the machine
• The altitude
Changing The Temperature Offset Value
We recommend leaving the offset temperature programmed at its default setting of 19 until you become
quite accustomed to the machine or have a specific reason for changing it. To adjust the offset:
1 With the power switch in “Position 0,” hold down both PID buttons at the same time turn the power switch
to either “Position I” or “Position II.”
2 Continue holding the buttons down until the display reads “F.03”.
3 Release the buttons
4 Repeatedly press and release the left button and cycle through the various display parameters until the
display reads “F.04.”
5 When “F.04” is displayed, press the right button once to display the programmed offset temperature.
CAUTION: In Fahrenheit the temperature offset default value is 19. If you change the tempera-
ture measurement system to centigrade it is important to change the offset value to 10.
6 Press the right button to increase the offset temperature or the left button to decrease the offset temperature.
If no change is made for a period of approximately two seconds, the display will revert to “F.04.” Pressing
the right button will bring back the last selected offset temperature.
7 Once the desired offset temperature is displayed, to commit it to memory, release the buttons and turn the
DD power switch to “Position 0.” Next time you turn the DD on, the last-selected offset will be applied. You
can verify this by repeating step 1 through step 5 in this section. To leave the programming mode and return
to standard operation the DD has to be turned off then on again.
Verifying All PID Settings
There are six settings in the PID’s system. The three sections above cover the measurement unit system,
brew temperature setpoint, and the brew boiler temperature offset. These are the only settings which should
be changed by the user unless directed to do so by the reseller or an authorized technical support representa-
tive. The other three are the P, I, and D values which create a mathematical system used to regulate how the
electronics control the brew boiler temperature. Generally, we do not recommend changing these settings, and
you do so at your own risk. This section is placed here so that you can verify that the settings are correct in
case you make a mistake at some point when adjusting other parameters:
WARNING: Changing these P, I, or D values, either purposely or accidentally, can have a negative
affect on the operation of the DD. Damage to the machine or property, personal injury, or negative
performance can be the result, and such damage or difficulties are not covered by the warranty.
1 With the power switch in “Position 0,” hold down both PID buttons at the same time turn the power switch
to either “Position I” or “Position II.”
2 Continue holding the buttons down until the display reads “F.03” then release the buttons.
3 Press and release the left button. Display now reads “P.”