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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 oxida-
tion 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 elec-
tronics when the machine is still live, any guar-
antee will automatically be invalidated.
All original spare parts are available from the
Manufacturer’s website. The Manufacturer may
provide the list of spare parts recommended for
the maintaining the various versions of the machine.
7.3.2 Maintenance after a short period
of machine 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
water inside the hydraulic circuits must be replaced as indi-
cated in para. 6.7.
Furthermore, all periodic maintenance operations must be
carried out, see the previous paragraph.
7.3.3 Dispensing group maintenance
Replace the dispensing group's
shower screen (2) and group gas-
ket (4) on a quarterly basis (we rec-
ommend only using original spare
parts), by proceeding as follows:
• Unscrew the screw (1).
• Remove the shower screen con-
tainment ring (3).
• Replace the group shower
screen (2) and the rubber group
gasket (4).
• Reassemble the components.
1
2
3
4
7.3.4 SAFETY VALVE check
The pressure relief valve is one of the main components for
machine safety. Therefore, it is important to carry out the fol-
lowing checks:
First check:
• Remove the machine's upper grille.
• Use pliers to pull the valve pin (6) 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 off.
• Close off 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 Manufactur-
er's original Safety Valves.
7.3.5 NEGATIVE PRESSURE VALVE check
First check:
• Remove the machine's upper grille.
• Use pliers to push the valve pin (5) 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 off.
• Open the steam valves and release all the pres-
sure from inside the heating unit.
• Turn the machine back on and check that the
valve is closing normally.
If any malfunctions are detected, the
valve must be replaced.
6
5
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