GRADISCA Restyling rev.1 - 06/2004
25
Gas heating regulation
Manual lighting
Turn the main switch to position 2 and wait until the machine reaches
working pressure (± 0,9/1 bars - Leva: ± 1,25 bars). To light the
burner, press the gas push-button(n°1 fig. 3) and keep it pressed
and light the burner with a match. Release the gas push-button
after about 8/10 seconds. Use the “minimum flame” (n°2) regulation
screw to obtain the required flame height (1/1.5 cm. high), turning
it clockwise to increase the flame and counterclockwise to reduce
it. At this point remove the protection cowl (det. A fig. 3) after
having slackened the “knurled” nut (det.B); use the regulation screw
(det. C) until the required pressure is reached (clockwise for an
increase in pressure). To increase the gas flow, turn the gas jet
ring-nut (det.D) in a clockwise direction. Greater combustion(blue
flame) may be obtained by increasing the air flow through the slot
in the sleeve (det. E). On the other hand lesser combustion (red
flame) is obtained by reducing the air flow.
Fig. 3 - Gas system with manual lighting
MAINTENANCE
Daily cleaning operations, preferably done in the evening:
- Clean the delivery groups’ sprays, underpan seals and filter holder guides with a sponge cloth. Rinse the filters and filter holders in hot
water with the addition of a specific detergent, to dissolve the fatty coffee deposits. Fit and remove the filter holder to the group, after
having installed the blind filter, and make several deliveries.
- Clean the tray and the cup support grid: remove the cup support grid, slide out the drain water tray and clean it. Also check and, if
necessary, clean the plastic drain tank removing possible coffee grounds with the help of a teaspoon.
- Outer case cleaning: use a damp cloth (not abrasive). Never under any circumstances use alcohol or solvents.
- Carefully clean the steam pipes used for heating beverages immediately after use, so as to avoid the formation of deposits which could
block the delivery nozzles and also to prevent different types of beverages heated previously from contaminating the taste of the beverage
being heated.
Weekly cleaning operations
- Cleaning the group and sprays of the Digit version: perform an automatic group cleaning with detergent.
- Cleaning the group and sprays of the P semi automatic version: put a teaspoon of special coffee machine detergent powder into the
blind filter provided with the machine and fit it to the group to be cleaned using the filter holder. Press the group’s delivery control push-button
as for a normal coffee delivery. Stop delivery after about 30 seconds. Repeat the operation several times until clear water can be seen coming
out of the solenoid valve drain pipe. Rinse the group using a normal filter and make a few deliveries using only water. Then make a coffee to
eliminate unpleasant tastes.
Instructions for draining water from the boiler
Attention: For machines with a small capacity boiler (less than 5 litres) it is
recommended to change the water frequently. Remove one litre of water every day,
taking it from the hot water tap.
Open the tap located under the boiler and wait until the boiler is completely empty. Then
close the tap again.
