Wega Mininova, Instructions Manual

Page: 90 / 126

88
espresso coffee machine - technician instructions
English
Checks Weekly Monthly Yearly
MACHINE
Using the pressure gauge of the machine, check that the pressure in the boiler is about 0.8
- 1.2 bar.
X X X
GRUPPO EROGAZIONE
Every 4 months, replace some components of the
group (be sure to use only original spare parts) :
- la guarnizione sottocoppa (A);
- la doccetta (B).
In caso di utilizzo intensivo della macchina,
effettuare la sostutuzione dei componenti
più frequentemente.
X
- Check for any WATER LEAKS at the bench and the efficiency of the drains.
X
Check that the pressure relief valve and non-return drain
valve are operating properly, proceeding as follows:
PRESSURE RELIEF VALVE
- Block the pressure switch contacts;
- Wait for the boiler pressure to increase
and check that the valve activates at the
maximum pressure of 2 bar.
NON-RETURN DRAIN VALVE
- activate the dispenser group for about 30 seconds
- attach a filter holder (C) with pressure gauge (available on request) to the group
- activate the dispenser group and use the pressure gauge (D) to check the increase
of pressure up a 8-9 bar
- check the increase of pressure due to the effect of the expansion of the water
that has been heated up to a value of about 12 bar. Reaching this value
proves correct operation on the valve and the seal of the gaskets and
the solenoid valves.
X
- Check for correct operation of the pressure gauge.
- Check for LIME SCALE on the heating element and boiler.
- Check the efficiency of the solenoid valve of the dispensing group.
X
X
: Important
XXX
: Very important
15. CHECKS and MAINTENANCE
To ensure perfect safety and efficiency of the appliance over time, it is necessary to carry out routine, preventive and special main-
tenance. In particular, it is advisable to carry out an overall check of the machine at least once a year.
A
B
C
D