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Vibiemme Vibiemme Double Domobar version 3 Manual

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32
PID Operation And Adjustment
The PID has various settings and functions that can be changed by the user. This section leads you through
the various settings, explaining their function as well as giving step-by-step instructions on how to change
each of them and which to leave alone.
WARNING: There are certain PID settings that if changed can have a negative effect on the opera-
tion 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.
PID Display
The digital display on the front panel of the DD normally displays the temperature of the water in the
boiler in real time. You will notice some drift in the temperature as various factors affect the temperature.
Normally, when the machine is idling, that will not be more than about one or momentarily two degrees.
During an extraction, you will notice that the temperature displayed will drop which is a normal occur-
rence. Even though the brew boiler water is preheated before entering the brew boiler, the incoming water is
still slightly cooler than the water already heated in the brew boiler. The temperature that really matters is the
temperature of the water hitting the coffee. Tests with sophisticated equipment have shown that the drift in
temperature at the coffee is within a one degree range. This is a positive result from the design of the DD and
how the water is transported out of the boiler and to the coffee. So don’t be concerned about the change in the
display’s temperature reading when an espresso extraction is taking place.
On and Off
At any time you desire, you can turn the PID on or off. ON is the factory default when the machine is first
powered up. If you turn the PID off, that becomes the default, even if the machine is unplugged. The button
to the right of the PID’s display controls this function. To turn the PID off, when the machine has powered up
and the PID displays the brew-boiler’s temperature, press and hold the PID Power button for approximately
one second until “oFF” is displayed. Repeat to turn the PID’s function back on.
NOTE: When the PID is turned off, the brew boiler’s heating element is no longer energized and
the water in the brew boiler begins to cool.
CAUTION: Only change the temperature settings with the brew boiler on (the PID display should
show the current brew boiler temperature). “oFF” should not be displayed before making changes.
Changing The Measurement System (C or F)
The PID system can be easily changed to display your choice of Centigrade or Fahrenheit units of tem-
perature measurement:
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 Press the right button to display the current default temperature measurement system which will be either
“°F” or “°C.” Press either button to toggle between “°F” or “°C”. If no button is pressed for a period of ap-
proximately two seconds, the display will revert to “F.03.” Pressing the right button will once again display
the last-selected temperature measurement system.
5 To commit the change to the PID’s memory, release the buttons and turn the DD off. Next time you turn
the DD on, the last-selected measurement system will be in use and remain the default until changed by the
user.
… 38 …


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