Operating Instructions; Filling The Boiler; Calibration Of Pump Pressure; Calibration Of Water Pressure In The Boiler - La San Marco 85 Manuel D'utilisation Et D'entretien

6. Operating instructions

6.1 Filling the boiler

Checking the position of the taps in the water system
a) Remove the coffee ground collection tray with grille. Now, check for the following configuration:
b) Install the coffee ground collection tray with grille
c) Open the main water fill tap 33
d) Open a steam delivery lever 5 to allow air to escape from the system as the boiler is filled.
Mod. 85 - Practical - S/E
e) Move the main switch 1 to position 1 to fill the boiler automatically without activating the heating ele-
ments. When the water reaches the probe, the "MAX" led will light up. When the boiler is full, turn the
main switch to working position 2.
Mod. 85 - S/E - 2 - 3 - 4
f) Make sure that the main switch 1 is in position "zero".
g) Press and hold down the button 14 until the sight glass 20 is 3/4 full.

6.2 Calibration of pump pressure

a) Once the boiler is filled, turn the main switch to position 2 (the heating elements start to heat the water).
b) Press the continuous-feeding push button 19 for the manual serving machines or the push button 10 for
the electronic machines with automatic serving, so that the water flows out of the unit corresponding to
the pressed button.
c) Read the water pressure value on the lower part of the
pressure gauge 18. The optimum pressure is 9 bar.
The pressure is adjusted to the desired value by oper-
ating on the pump screw: the pressure is increased by
turning clockwise; it is decreased by turning counter-
clockwise. As shown in the following figure, there are
three different cases for adjusting this screw, depend-
ing on the pump installed on the machine:
- adjust only the screw
- adjust the screw and lock it with the lock nut
- unscrew the cap nut and adjust the screw.

6.3 Calibration of water pressure in the boiler

a) After having filled the boiler to the proper level, turn the main switch to position 2 (the heating elements
will start to heat the water).
b) Open the lever-controlled steam valve 5 to vent the air during the heating phase. Close the valve as soon
as the steam phase is reached. The steam pressure in the boiler can be read on the upper scale of the
pressure gauge 18 from 0 to 3 bar. The pressure rises to the calibration value of the pressure switch 27
in the range from 0.9 to 1.1 bar. To vary the steam pressure, turn the screw 28 on the pressure switch
27. The pressure is decreased by turning the screw clockwise and it is increased by turning the screw
counterclockwise. The screw is adjusted by means of a screwdriver inserted into the hole on the lid of the
pressure switch. The pressure switch can be reached from the upper tray and grill.

6.4 Heating the water in the boiler

a) Rotate the main switch to position 2.
b) Hold down a steam delivery lever 5 to allow air to escape from the system as the machine heats up.
Release the lever as soon as steam escapes from the delivery pipe. Boiler pressure is indicated on the
0-to-3-bar scale on the pressure gauge 18 (suggested value: 0.9-1.2 bar).
28
PUMP SCREW