english -
37
R
espresso coffee machine - technician instructions
INTERVENTION
Weekly Monthly Yearly
NON-RETURN DRAIN VALVE
- Activate the delivery groups for about 30 seconds;
- attach a filter holder
(7)
with a gauge (available on request)
to the delivery group;
- activate the delivery group, and use the gauge
(8)
to monitor
pressure increase up to 8-9 bar;
- check the increase in the pressure due to the expansion of
the heated water up to a value of approximately 12 bar:
reaching this value confirms proper operation of the valve
and the seal of the gaskets and solenoid valves;
- de-activate the deliveries;
- repeat the control on the other delivery groups.
X
GAUGE
Monitor the boiler pressure value as explained in chapter 1, "Technical Characteristics".
X
GAUGE
Periodically check water pressure during coffee delivery: check the pressure indicated on the gauge,
which must be between 8 and 9 bar inclusive.
X
FILTERS and FILTER HOLDERS
Check the condition of the filters. Check for any damage on the edge of the filters and check whether
any coffee grounds settle in the coffee cup.
X
GRINDER-DOSER
Check the dose of ground coffee (between 6 and 7 gr. per stroke) and check the degree of grinding.
The grinders must always have sharp cutting edges. Their deterioration is indicated by the presence
of too much powder in the grounds. You should replace the flat grinders after every 400/500 kg
of coffee. For conical grinders, replace every 800/900 kg.
X
SOFTENER
The build-up of lime scale deposits in the hydraulic circuit of the machine indicates that regenera-
tion has been neglected. Carry out maintenance of the boiler and of the hydraulic circuit, replacing
any components as required. Use care in areas where the water is very hard. It will be necessary
to regenerate at more frequent intervals, likewise if there is high consumption of hot water for tea
and so forth.
X
PRESSURE GAUGE AND PRESSURE SWITCH
Check for proper operation of the pressure gauge and pressure switch.
X
HYDRAULIC CIRCUIT
Check for lime scale deposits on the heating element, on the exchanger (inside and out) and on the
hydraulic circuit. When replacing any components, always replace the relative gasket as well.
X
DISPENSER UNIT
Check the condition of the solenoid valve of the delivery group.
X
DRAIN
Check for trace water leaks on the counter. Also check the condition of the discharge tub and its
connection to the sewer system.
X
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