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Vibiemme Domobar Super Manual

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16 - Advanced Adjustments
The tasks listed in this section are not usually necessary. These adjustments are for the advanced user who
wants to fine-tune the operation of the machine or to compensate for changes in the way the machine operates
over time. These usually do not need to be changed more than maybe once or twice a year, if that.
Brew Pressure Adjustment
CAUTION: Care should be taken when adjusting the pressure relief valve. Setting a too-high pres-
sure will not only make it difficult to get good tasting coffee but could cause other problems and accelerated
component wear. Setting it too low will necessitate a much more coarse grind and will negatively affect the
taste of the espresso.
The pump in your Vibiemme Domobar Super is capable of developing pressure far greater than needed to
make espresso. If all of that pressure is allowed to reach the coffee, over-extraction is the result. To control the
maximum pressure that can reach the coffee there is an adjustable pressure regulator at the output side of the
pump.
In situations that sufficiently restrict the flow of the pump causing it to develop high pressure, the relief valve
opens and allows some of the water being pumped to travel through a special hose back into the water reservoir.
That is the function of the second hose in the reservoir without a filter at its end. In actual operation the relief
valve will open and close as needed, to the extent needed- sometimes open slightly to allow a trickle to pass, other
times allowing a greater flow, and sometimes not opening at all.
The valve is adjustable and the user can set it to their liking. Be aware
that the brew pressure gauge on the front panel reads a slightly higher pressure
than the extracting pressure you desire in the grouphead. If you rely solely on
the gauge’s reading to make adjustments, odds are that the brew pressure will
be too low. It reads about 1 ATM higher than the pressure that reaches the cof-
fee.
To make adjustments to the brewing pressure, remove the rear cover by
unscrewing the six screws (three on each side of the machine) and you will see
the OPV valve through an opening directly below the water reservoir.
Insert the blind filter and turn the power switch to Position I. Turn on a
brew cycle and when the gauge settles in after about ten seconds, adjust the
relief valve.
CLOCKWISE RAISES the PRESSURE
COUNTERCLOCKWISE LOWERS the PRESSURE
Turning the screw clockwise (tighter) increases the brew pressure, and turning it counterclockwise (loosen-
ing) lowers the brewing pressure.
CAUTION: The adjustment is extremely sensitive and only very small movements of the screw should
be made when searching for a proper pressure. Generally speaking, less than the width of the slot of the ad-
justing screw is sufficient. After having the brew function on for about 45 seconds, turn off the brew cycle
and allow the pump to rest for one or two minutes to avoid overheating the pump.
WARNING: there are sharp edges around the divider panel. Use caution when adjusting the over
pressure relief valve.
A slightly higher water pressure will work well for darker roasts, and a slightly lower pressure is best for
lighter roasts. Since it is a bit of work to access the regulator, if and when you feel the need to adjust it, make a
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