La San Marco TOP 85, Использование и обслуживание

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5.2 Calibration of pump pressure
a) Once the boiler is filled, turn the main switch to posi-
tion 2 (the heating elements start to heat the water).
b) Press the continuous-feeding push button for the
manual serving machines or the push button 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. 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 counterclockwise. As shown in the following figure, there are
three different cases for adjusting this screw, depending 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.
5.3 Adjustment of steam pressure in boiler
The steam pressure in the boiler is shown on the upper graduated scale of the pressure gauge B (figure 13).
The lower graduated scale indicates the operating pressure of the pump. To change the pressure of the liquid-
saturated steam mixture inside the boiler, you will need to vary the temperature as explained in the program-
ming chapter.
figure 13
5.4 Adjustment of temperature of dispenser groups
In models TOP 85 (except for models TOP 85 DTC) the temperature can be adjusted for the serving of es-
presso coffee without changing the internal pressure of the boiler. At the head of the serving group, there is
a valve (flow rate variator) positioned at the top of the brewing unit adjusts the flow of hot water arriving from
the exchangers; this valve can be accessed from the top by removing the upper protection from the units,
removing the 2 screws (figures 14). four numbers are printed above each unit (
2-3-4-5
) in correspondence
of each brewing unit (figure 15). The valve is normally set to number
3
(this is the default setting provided by
LA SAN MARCO SPA). If you want to change the serving temperature, you will need to use the valve (flow
variator) of the group. To increase the temperature, turn the valve towards the higher numbers. Contrarily, to
decrease, turn the knob towards lower numbers.
figure 14
PUMP SCREW