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12
Gauges
There are two pressure gauges on the front of the machine. These allow you to monitor important func-
tions inside the machine while in operation:
Steam Boiler Pressure
The gauge on the left displays the pressure in the steam boiler. Normally
this will move up and down in a rhythmic cycle. This movement is the range
through which the pressure builds and decreases in response to the pressures-
tat’s switching of the steam boiler’s heating element on and off (see Chapter 7
for details). When using the steam or hot water function, this gauge will show
a drop in pressure. Those changes mentioned above are normal.
Brew Pressure Gauge
The Gauge on the right is the pressure gauge indicating the force of wa-
ter being delivered to the coffee while brewing espresso. Any time other than
when the pump is energized and brewing espresso, this gauge may show an
inaccurate reading as high as “12.That is not a defect and this gauge can be
ignored at any other time other than when the machine is making espresso.
The one exception is that when a machine which is plumbed, turned off, and
has cooled down, that gauge will show the approximate pressure of the water
in the plumbing’s supply line which should not exceed 2.4 BAR (see Chapter
8 for details).
WARNING: If low water indicator lamp is illuminated it is important to be sure that the brew lever
is in the fully down position. If left up, as soon as the reservoir has sufficient water, the pump’s
motor will start and hot water can flow from the group which can create a burn hazard if the user
is not prepared.
Indicator Lamps
On the front panel there are three indicator lamps:
STEAM BOILER ACTIVITY
The lamp on the far left, next to
the steam boiler’s pressure gauge,
indicates when the steam boiler’s
heating element is receiving power.
When the power switch is in “Posi
-
tion II” this lamp will cycle on and
off once the boiler comes up to tem-
perature.
LOW WATER
The lamp to the left of the
brew boiler pressure gauge illu
-
minates to alert that user that the
reservoir’s water level is too low.
At this time the machine shuts
down all functions and cannot be
used until the reservoir is filled
again.
POWER
The indicator lamp on
the far-right is the power
lamp indicating that the DD is
plugged into a working pow-
er outlet and that the power
switch is in “Position I” or
“Position II” sending power
to the machine.
NOTE: The color ranges (the red and green zones on the gauges’ faces) do not indicate a “safe” nor
a “danger” zone. The numerical ranges reading can be important but the color bands on the gauges
can be safely ignored.
18


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