Astoria 1GR Use And Maintenance Manual page 45

Component
PRESSURE GAUGE
FILTERS AND FILTER
HOLDERS
DISPENSING GROUP
WATER FILTER
WATER SOFTENER
GRINDER-DISPENSER
HEATING UNIT
HEATING UNIT
SAFETY VALVE
SCNR VALVE
NEGATIVE PRESSURE VALVE
HYDRAULIC CIRCUIT
DRAIN
DISPENSING GROUP
GAS SYSTEM
WATER and STEAM NOZZLES Check the condition of the nozzles and clean the sprayer.
DOSING DEVICE
TECHNICIANS' manual
Check the heating unit pressure which must be between 0.08 and 0.14 MPa
(0.8 and 1.4 bar).
Periodically check the water pressure when coffee is being dispensed: check the
pressure indicated on the gauge, which must be in the range of 0.8 to 0.9 MPa
(8 and 9 bar).
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, and
replace the filters and/or filter holders, as required.
Replace the shower screen and group gasket as indicated in para. "8.3.3 Dis-
pensing group maintenance" on page 38.
Replace the water filter cartridge at the frequency indicated by the manufacturer.
If limescale has formed in the hydraulic circuit, the filter will need to be re-
placed.
Carry out the regeneration procedure as instructed by the manufacturer.
Take care in areas where the water is very hard. The water will need to be
regenerated more frequently, especially if the machine is used intensively
Check the ground coffee dose (around 7 grams each time) and check the degree
of grinding. Grinders must always have sharp cutting edges. Too much powder
in the grounds is an indication that the coffee is deteriorating. We recommend
contacting the Technician to replace the flat burrs after every 400/500 kg of
coffee, or after every 800/900 kg for conical burrs.
Replace the water in the heating unit as indicated in para. 6.7.
Replace the electric heating element if it becomes faulty or malfunctions.
Do not replace the heating element with a more powerful one. Before making
any changes, please contact the Manufacturer.
If the thermostat of the heating element is triggered, reset it by pressing the
central button of the thermostat. However, before starting the machine up
again, check what caused the problem.
If the heating unit insulation needs to be removed, restore the insulation after
the maintenance work has been completed.
Remove and clean the heating unit level probes.
Check for lime scale deposits on the heating element, on the exchanger (inside
and out).
If there is a lot of limestone build-up, this indicates that the water filter has not
been replaced, or that the softener has not been regenerated.
When replacing any components, always replace the relative gasket as well.
Check that the safety valves, non-return drain valves and negative pressure
valves are operating properly, as indicated in para. 7.3.4 - 7.3.5 - 7.3.6.
If these need to be replaced due to malfunction, repeat the check with the
newly-installed valve.
Check whether there is any lime-scale build-up in the hydraulic circuit.
When replacing any components, always replace the relative gasket as well.
If there is a lot of limestone build-up in the machine's hydraulic circuit, this
indicates that the water filter has not been replaced, or that the softener has
not been regenerated.
Take care in areas where the water is very hard. The water filter will need to be
replaced more frequently and the water softener will need to be regenerated
more often, especially if the machine is used intensively.
Check for any leaks on the water mains and sewer connections. Check the
condition of the drain tray and the drain connection tube.
Check the efficiency of the dispensing group's solenoid valve.
Check for any gas leaks with a suitable gas detection instrument, or by wiping
a soapy solution over all the gas system fittings.
Check and clean the volumetric dosing device by removing any oxida-
tion from the tips.
Type of operation Quarterly Yearly
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