Isomac PRO 3.1, Use And Maintenance Manual, Page: 22 / 36

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5 – FIRST USE OR REUSE
Follow carefully the instructions before using the machine.
• open the external packing and take the machine out. Inspect the
machine to ascertain that it is intact and in good condition. Check
for the presence of all the accessories supplied with the machine
(see paragraph 4)
• position the machine on a flat surface
• remove the cover and take out the water tank ( 2 ) (located inside
the machine) and rinse it
• fill the container with clean water, return it to its housing and
insert the silicon tubes. Close the cover on the machine.
The machine PRO 6.1 offer the versatility of use with water tank (2)
or with connection to the water supply, using the appropriate pipe
supplied (17). (SEE PAR. 5.1)
To use the machine with water tank (2) the switch (Z) has to be in
position I (operation to be performed with the machine off).
WARNING! Before making the electric connection,
make sure that the main power voltage corresponds
to the specifications indicated on the data plate placed
under the base of the machine.
Press the main power switch ( 1 ). Wait about 2 seconds to allow
the circuit to perform a control check. The pilot light ( 14 ) will be
switched on. To use the machine connected to the water network,
position the switch (Z) on II (operation to be performed with the
machine off).
Removing the cap (W) from the tray and connecting the silicon
tube ( 25 ) to the pan (Y) you can download directly into the water
drainage pipe. (see FIG.2)
The automatic level indicator will start filling the boiler with water
until it automatically reaches the prescribed level; the boiler water
level is automatically checked and the prescribed level will be
automatically refilled.
Then wait until the machine reaches the 1.1 – 1.3 bar operating
pressure, by checking the boiler pressure on the pressure gauge
( 5 ).
The machine with a basin built-in is provided with a safety device
controlling the amount of water contained in the basin itself;
The green light (14) flashes to indicate the lack of water in the tank
(2) and the device automatically cuts off all machine functions.
As it is filled up, the warning light switches off and the machine is
ready again to deliver coffee.
Fill the filter holder ( 12 ) with the brewing group ( 11 )
Thanks to the working of the lever group ( 15 ), brew some water to
avoid the correct refilling of the coffee exchanger.
WARNING ! The coffee brewing and the power supply
of the heating element don’t work when the water
tank lamp (14) flashes.
During start-up: when the boiler pressure gauge ( 5 ) shows a
pressure of approximately 0.5 bar, open slowly the steam tap
handle ( 7 ), to discharge the air contained in the boiler, and wait
until steam starts flowing out of the steam supply nozzle ( 10 ), then
close it.
Wait for the reaching of the pressure and the correct thermic balan-
ce, after 10 minutes.
5.1 - WATER SYSTEM
Caution! The machine must be supplied with water having a
hardness above 8°F degrees.
It is advisable to install a water softener for the machine water
system. Ensure that you will be connecting the machine to drinka-
ble water mains.
The connection to the water supply of the machine must be in
accordance with the country of destination.
The pressure of water entering the machine must not exceed
0,65Mpa
- Connect the hose (17) to the connector (X) located under the
machine and then connect it to the water mains.
- As far as the mains pressure is concerned, if this exceeds 0,5Mpa
(5bar), it is advisable to install a balanced pressure reducer for
high pressure (a device whereby any mains increase does not
affect the output pressure).
5.2 PRESSURE SWITCH REGULATION (Only PRO 6.1 and PRO
5.1 Models)
The pressure switch shown in the picture has to keep the pressure
in the boiler constant, by activating or deactivating the electrical
heating element.
This pressure switch is adjusted during the final testing of the
machine on a 1.1÷1.3 bar value; however, if the specific case
requires a different operating pressure, the pressure switch ope-
rating range can be changed by operating on the regulation
screw (U): by reducing the pressure, you will obtain a temperature
reduction, by increasing the pressure, the water temperature also
increases.
The regulation sense is shown in the picture and also on the pres-
sure switch itself. The pressure changes approximately 0.1 atm for
each complete turn of the screw.
5.3 - PUMP PRESSURE
SETTING (Only PRO 6.1 and
PRO 5.1 Models)
Insert in the brewing unit the
filter-holder filled with properly
ground, dosed and pressed
coffee. Activate the lever
group endowment (15) and
read the pressure on the pump
manometer (4).
Note: The correct pressu-
re is 8/9 bar.
If the pressure displayed by the
manometer should not prove
correct, operate the pump pressure regulation screw (R - Fig.3), by
turning it clockwise to increase pump pressure or anticlockwise to
reduce pressure.
Once regulation is complete, check the pump setting by delivering
one or more coffee servings.
6 - COFFEE PREPARATION
Fig. 1
Fig. 2