english -
17
R
espresso coffee machine - technician instructions
ATTENTION
• during the machine's warm-up phase (roughly 20 minutes), the negative pressure valve will release steam for a few seconds until the
valve itself closes.
• before using the machine, run dry deliveries with the filter holder attached for a few seconds to release any air which may be in the
circuit, so that the delivery groups are completely heated.
• before using the machine, dispense a few servings of coffee to test the grinding and to check the operating pressure of the machine
1
2
0
3
1
0
2
Switch
Power switch
3.7 EXTERNAL MOTOR PUMP ADJUSTMENT
To adjust operating pressure proceed as follows:
• Operate a coffee delivery switch;
• Adjust the pressure by turning the screw located on the pump
(3)
so as to obtain a pres-
sure of between 8 and 9 bar. Tightening the screw increases the pressure, and loosening it
reduces the pressure. Check the pressure by means of the pressure gauge
(4)
located on
the front part of the machine;
• turn off the delivery switch;
3.8 MACHINE TUNE-UP
When installation is complete, the appliance has to be started, brought to the nominal working condition and left for 30 minutes in the "ready
to operate" condition.
Afterwards, the appliance has to be turned off and emptied of the first water introduced in the whole hydraulic circuit, to eliminate possible
initial impurities.
Then the appliance must be once again loaded and brought to the nominal working conditions.
After having reached the "ready to operate" condition, the following operations have to be performed:
a) for each coffee unit, carry out a continuous delivery, in order to release at least 0.5 liters of the coffee circuit. In the case of several dis-
pensing points matched with the same exchanger/coffee boiler, divide the volume on the base of the number of the dispensing points;
b) release the whole volume of hot water inside the boiler (3 liters for 1GR, 6 liters for 2GR, 8 liters for 3GR, 11 liters for 4GR), by performing
a continuous delivery from the appropriate nozzle. In the case of several dispensing points, divide the volume on the base of the number
of the dispensing points;
c) continuously release steam for at least 1 minute for each steam dispensing point;
When installation is complete, the installer must write a report about the performed operations compiling the Installation Instructions provided
with the machine.
4
Switch
Open the water tap of the water mains and of the softener.
Using manual fill
(2)
fill the boiler with water until the optimal level is restored.
Turn the switch to position “
1
” and wait for the machine to warm up completely.
Power switch
Open the water tap of the water mains and of the softener.
Turn the switch to position “
1
” (electrical power supplied to the pump for automatic boiler filling
and machine services) and wait for the boiler to be automatically filled with water.
Turn the switch to position“
2
” (full electrical power supplied, including the heating element in the
boiler) and wait for the machine to warm up completely.
