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Vibiemme Vibiemme Double Domobar version 3 Manual

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33
6 You can verify that the selected system is in use by this by repeating steps 1 through step 4 above.
CAUTION: If you change the temperature measurement system from F to C it is critical to change
the temperature offset to “10” as explained later in this chapter.
Temperature Setpoint
The electronic control that sets the temperature of the water which brews espresso is controlled by the
PID. You can easily adjust this temperature. Whether this is your first machine or fifth, it will take a little
time to become accustomed to how your new DD operates and behaves. Once you become accustomed to
the machine and the taste of the espresso you are creating, you can adjust the brewing temperature to match
your taste. You may want to change the brewing temperature for different blends, roasts, or the drinks you are
preparing.
How To Adjust The Temperature Setpoint
To adjust the brewing temperature up or down:
1 After the machine has gone through its power-up cycle, press and release the “P” button. The flashing value
in the display should now be the current setpoint.
2 While the display is still flashing use the two buttons to adjust the flashing temperature. The left button rais-
es the setpoint and the right button lowers it. Each press of a button changes the temperature one degree.
3 When the desired setpoint temperature is displayed, you are done. The display will return to its normal state
if you do not press a button for about two seconds. The display now shows the current boiler temperature as
read by the electronics of the machine and adjusted by the programmed offset value.
PID Brew Temperature Adjustment Tips
• After changing the setpoint, allow the machine to stabilize to the new temperature before brewing the next
espresso. Once it stabilizes, perform a cooling flush and allow it to stabilize once again. At that point it
should be ready.
• Avoid making large changes to the setpoint. Particularly while still becoming accustomed to the machine.
Change it by one degree at a time and use that for a day or two before changing again. Otherwise it can be
difficult to discern whether it was the temperature change or some other factor that caused a change in taste
(if there was a change).
• Do not be concerned if you read that experts say that 203° F. (95 c.) is the best temperature for brewing
espresso and you end up preferring a displayed temperature that is lower or higher than that. The displayed
temperature is close, but not necessarily an exact representation of the actual brewing temperature because
of the factors described earlier in this chapter.
• The best way to find the temperature that is most beneficial for you is to taste the espresso and adjust ac
-
cordingly.
PID Temperature Offset
To achieve any given brewing temperature, the water in the boiler has to be kept at a temperature that is
higher than that desired brew temperature. The reason is that the water has to be transported from the brew
boiler through two, large-diameter copper pipes, and then through the brewgroup before it can get to the cof-
fee. Though that journey the water loses some thermal energy. To compensate for that drop in temperature, the
brew boiler is kept at a higher temperature than would be optimal for brewing espresso.
How much hotter? Your DD came with the brew boiler set about 19° F. hotter than the temperature shown
on the LED display. The difference in these two temperature is referred to as the temperature offset. It is a
programmed function in the PID’s control system. That offset was decided upon after a lot of testing of DD
machines using some very sophisticated equipment for measuring and recording temperatures from various
parts of a DD in actual operation.
… 39 …


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