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When the lever is lifted just past the first click stop the passive pre-infusion
begins. This allows a slight flow of water onto the coffee. This gentle flow of wa-
ter wets the puck slightly which helps with extraction and can also help eliminate
channeling (disruption of the coffee causing a fast flow). If is not necessary to
use this position, but leaving it in this mode for about two or three seconds can
be useful.
Lifting the lever to its full up position
(shown in the photo to the left) closes the
3-way valve and open the brewing path be-
tween the heat exchanger and the coffee.
At the same time, the cam to which the
lever is attached depresses the switch on the
front of the Domobar Super, just to the right
of the E-61 grouphead, behind the cam. This
switch activates the pump.
When you choose to end the brewing cycle, return the lever to its at-rest, fully down position. Moving the
lever to this position turns off the pump and opens the manual 3-way valve which is built into the grouphead.
This is a path from the grouphead down through the lower portion of the casting, and into the drip tray. When it
is opened it allows the pressure remaining in the brewing path to flow into the drip tray. This allows you to im-
mediately remove the portafilter without worrying about the “portafilter sneeze”- that’s a spitting out of coffee or
hot water from confined pressure as can happen on lesser machines without a 3-way valve.
Semi Automatic
The semi-auto model is identified by its single button in the center of
the control panel, between the gauges. Pressing this button turns the pump
on and energizes the electrical solenoid, closing the 3-way valve. The brew-
ing path is now sealed and the full force of the pump, as regulated by the
pressure relief valve (OPV), can be delivered to the coffee.
When you choose to end the brewing cycle, press the brewing button
once again. The pump will be turned off and the 3-way valve’s solenoid is
de-energized. The valve opens and relieves the pressure remaining in the
brewing path and releases it into the drip tray. This allows you to immedi-
ately remove the portafilter without worrying about the “portafilter sneeze”-
that’s a spitting out of coffee or hot water from confined pressure as can
happen on lesser machines without a 3-way valve.
12


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