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TECHNICIANS manual
10.3.2 Maintenance after a short period of machine
inactivity
If the machine is inactive for more than one week,
all the water contained in the hydraulic circuits must be
replaced, as indicated in para. "6.6 Replacing the water"
on page 32.
In addition, all the scheduled maintenance operations
indicated in the above table must be carried out.
10.3.3 Maintenance after a long period of inactivity
If the machine is inactive for more than one month,
all the water contained in the hydraulic circuits must be
replaced, as indicated in para. "6.6 Replacing the water"
on page 32 and the machine must be fully checked.
10.3.4 Dispensing group maintenance
Every three months, replace the shower head (
2
) and
the undercup seal (
1
) of the delivery group.
We recommend using only original spare parts.
10.3.5 SAFETY VALVE check
The pressure relief valve is one of the main
components for machine safety. Therefore, it
is important to carry out the following checks:
•
Remove the machine's upper grille;
•
Use pliers to pull the valve pin (3) upwards;
•
If the pin will not budge, it probably means
that the valve is encrusted with limestone
and must be replaced.
If any malfunctions are detected, the valve must be replaced. Only
use the Manufacturer's original Safety Valves.
10.3.6 CHECK VALVE inspection
The non-return drain valve is an important compo-
nent for the correct operation of the machine. Perform
the check as follows:
•
Activate the dispensing groups for about 30
seconds;
•
Attach a filter holder (
4
) with a
pressure gauge (available on re-
quest) to the dispensing group;
•
Activate the dispensing group, and
use the pressure gauge (
5
) to moni-
tor the pressure as it increases up
to 8-9 bar;
•
Check that the pressure is increasing due to the
heated water expanding until it reaches approxi-
mately 12 bar: when this value
is reached, it confirms that the
valve is working correctly and
the seals and solenoid valves are
tight;
•
Stop dispensing;
•
Repeat the check on the other
dispensing groups.
If any malfunctions are detected, the valve must be replaced.
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2
3
4
5
Summary of Contents for 2GR
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