TECHNICIANS' manual
- English -
33 di 52
Component Type of operation
Quarterly
Yearly
PRESSURE GAUGE AND
PRESSURE SWITCH
Check that the dosing device and pressure switch are working properly. X
VOLUMETRIC DOSING
DEVICE
Check and clean the volumetric dosing device by removing any oxidation from
the tips.
X
MOTOR PUMP Visually inspect the condition of the machine’s wires. X
If any work is carried out on the machine electronics
when the machine is still live, any guarantee will au-
tomatically be invalidated.
All original spare parts are available from the Manu-
facturer’s website. The Manufacturer may provide the
list of spare parts recommended for the maintaining
the various versions of the machine.
7.4.2 Maintenance after a short period of ma-
chine inactivity
“Short period of machine inactivity” refers to a period of time
exceeding one working week.
If the machine is switched back on after this period, all the wa-
ter inside the hydraulic circuits must be replaced as indicated
in para. 6.7 on page 28.
Furthermore, all periodic maintenance operations must be
carried out, see the previous paragraph.
7.4.3 Dispensing group maintenance
Replace the dispensing group's shower screen (A) and group
gasket (B) on a quarterly basis (we recommend only using
original spare parts).
A
B
7.4.4 SAFETY VALVE check
The pressure relief valve is one of the main com-
ponents for machine safety. Therefore, it is impor-
tant to carry out the following checks:
First check:
• Remove the machine's upper grille.
• Use pliers to pull the valve pin (C) upwards.
• If the pin will not budge, it probably means
that the valve is encrusted with limestone and must be
replaced.
Second check:
• Turn the machine o.
• Close o the pressure switch contacts.
• Turn the machine back on and wait for the pressure in the
heating unit to rise.
• Check that the valve is working correctly at the maximum
pressure of 0.19 bar (1.9 bar).
If any malfunctions are detected, the valve must be
replaced. Only use the Manufacturer's original Safety
Valves.
7.4.5 NEGATIVE PRESSURE VALVE check
First check :
• Remove the machine's upper grille.
• Use pliers to push the valve pin (D) downwards.
• If the pin will not budge, it probably means that
the valve is encrusted with limestone and must
be replaced.
Second check:
• Turn the machine o.
• Open the steam valves and release all the pressure from
inside the heating unit.
• Turn the machine back on and check that the valve is clos-
ing normally.
If any malfunctions are detected, the valve must be
replaced.
C
D
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