Pressure Switch Adjustment; Pump Pressure Calibration - Gaggia EVOLUTION E90 Mode D'emploi Et D'entretien

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6.2

Pressure switch adjustment

The pressure switch shown in the figure acts to keep the
boiler pressure constant by engaging or de-activating the
electrical heating resistance.
This pressure switch is already calibrated to 1.1-1.3 bar
during the initial machine testing stage, but should a
different working pressure be required, it is possible to
vary the operational field of the pressure switch using the
regulation screw (U); pressure reduction results in a
reduction in temperature, whilst increasing the pressure
will also increase the water temperature.
The regulation direction is shown in the figure and on the
pressure switch itself.
The pressure varies by 0.1 atm for every complete screw
turn.
Disconnect the electricity
supply before undertaking
this operation.
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6.3

Pump pressure calibration

Insert the filter holder into the unit filled with regularly
ground, dosed and pressed coffee. Switch on the unit
switch (E90) (17) or the unit control keyboard (D90) (16)
and read the pressure on the pump pressure gauge (11).
The correct pressure is of
8-9 atm.
hould the pressure indicated on the pressure gauge be
incorrect, turn it clockwise to increase the pump pressure
and anti-clockwise to reduce the pressure. Once
adjustment is complete check pump calibration by
delivering one or more coffees.
Z Pump pressure adjustment screw.
X Position of closed filter-holder with new machine
Y Position of closed filter holder with machine after a
short period of use