espresso coffee machine - technician instructions
36
- english
R
22. CHECKS and MAINTENANCE
To ensure perfect safety and efficiency of the machine over time, it is necessary to carry out routine, preventive and special maintenance. In
particular, it is advisable to carry out an overall check of the machine at least once a year.
5
6
INTERVENTION
Weekly Monthly Yearly
MACHINE
Carry out the cleaning as described in the previous chapter.
X
MACHINE
Every four months replace the perforated disk
(2)
and the undercup
seal
(4)
of the delivery group (use only original spare parts)
proceeding as follows:
1) loosen the screw
(1)
;
2) remove the containment ring
(3)
;
3) replace the perforated disk of the group
(2)
and the rubber seal
under the pad
(4)
;
4) reassemble the components.
X
VALVES
Check for proper operation of the negative pressure valve, pressure limiting valve and non-return
drain valve. If, owing to failure, their replacement becomes necessary, repeat the test with the new
valve installed. For the checks, proceed as follows:
NEGATIVE PRESSURE VALVE
1) first try :
- remove the top grill of the machine;
- use pliers to push the pin
(5)
downwards;
- If the pin does not move, it probably means the valve is encrusted with
limestone and must be replaced.
2) second try :
- turn the machine off;
- open the steam valves and drain off all the pressure from inside the boiler;
- turn the machine back on and check for regular closure of the valve.
SAFETY OR PRESSURE RELIEF VALVE
1) first try :
- remove the top grill of the machine;
- use pliers to pull the pin
(6)
upwards;
- If the pin does not move, it probably means the valve is encrusted with
limestone and must be replaced.
2) second try :
- turn the machine off;
- block the pressure switch contacts;
- turn the machine back on and check for pressure in the boiler to rise;
- check for correct intervention of the valve at a maximum pressure of 2 bar.
X
1
2
4
3
ATTENTION
After ta maintenance and/or repair intervention, the components used must ensure that the hygiene and safety requirements
initially foreseen for the appliance are still met. These are met by using original spare parts only.
After repair or replacement of components related to parts in direct contact with water and food, a washing procedure has to be
carried out, as in the case of
fi
rst installation.
