Vibiemme Domobar Junior - Manual (Page 9)

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7. Steam boiler pressurestat adjustment
The pressurestat controls temperature ( pressure) by sensing the pressure in the Steam boiler. Accessing
the pressurestat adjustment is simple. Simply remove the Cup Warming Tray and on far left you will see a
perforated panel with a black plug. Remove the plug fit a screwdriver, then turn to adjust the boiler temperature:
CLOCKWISE RAISES THE PRESSURE
COUNTERCLOCKWISE LOWERS THE PRESSURE
8. Hints, Tips, and Tricks
We have already reviewed in the general instructions some of the ways that you can control the way
the Vibiemme Domobar espresso machine operates. The best example is the cooling flush which allows
you equalize and control the brewing temperature throughout the brewing path as well as eliminate any
steam that may have built up during an extended idling period. There are other procedures that you can
use to gain further control over the way your Vibiemme operates.
8.1. Maximizing Steaming Power
You probably have noticed that the heating element cycles on an off while the machine is in operation and
even when it is idling. That can be seen by watching the Heating Element Activity Lamp on the control
panel. That cycling can be used to your advantage when steaming milk. For the greatest production of steam
throughout the steaming cycle, start steaming just before the heating element turns off. You can judge this by
watching the Heating Element Activity Lamp in conjunction with the boiler pressure gauge. The goal is to
begin steaming when the boiler is as hot as its range allows while the heating element is still energized. As you
draw off steam the pressure in the boiler (and thus the temperature) will drop slightly which keeps the heating
element energized. With a little practice you will be able to do this without hardly even thinking about it..
8.2. Minimizing Temperature Variations During the Pull
A similar procedure can be used for the brew cycle. The best time to begin pulling a shot is when
the heating element has just turned off. This gives a bit more temperature stability as well because it
eliminates the variable of the heating element coming on during the pull. If the heating element comes on
during a pull, you will hear the pump lose a bit of power because the heating element is drawing a large
percentage of the circuit’s available current. If the circuit that feeds electricity to your Vibiemme Domobar
is challenged by the demands of the machine, this procedure will help lessen that load.
8.3. Minimizing Mineral Buildup
Mineral buildup in the boiler can be minimized by using the proper quality water and by de-scaling as
mentioned in the general instructions. Another way to lessen this scale accumulation is to pump water
out of the boiler occasionally.
This is particularly important if you rarely use the hot-water function of the Vibiemme Domobar. To refresh
the water in the boiler, simply place a heat-resistant vessel under the hot water wand and open the valve.
Dispense about 6 ounces, and then allow the boiler to refill before proceeding. Repeat this two or three
times. Doing so every one or two weeks will help minimize scale build up.