Wega Mininova Use And Maintenance Manual For The Technician page 36

Checks
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.
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, as well as of the
gaskets and solenoid valves seal;
• de-activate the deliveries;
• check the other delivery groups.
• Verify the correct functioning of the GAUGE.
• Control any presence of LIMESTONE on resistance
and boiler.
• Verify the efficiency of the SOLENOID VALVE of the
dispensing group.
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Checks
SOFTENER
The formation of limescale in the hydraulic circuit of
the machine indicates that regeneration has been
neglected. Servicing the boiler hydraulic circuit
and replacing any components. Be careful in places
where water is very hard, it will regenerate shorter
intervals, as well as in cases of large consumption of
hot water for tea or other.
!
All maintenance operations must be carried out
after the power supply detachment, hydraulic
supply closing and full cooling of the machine. We
recommend the use of suitable protective gloves.
Not After maintenance and/or repair
intervention, the components used must ensure
that the hygiene and safety requirements
!
initially provided 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 first installation.
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