Wega ALE Series Use And Maintenance Manual page 36

8.3.3 Dispensing group maintenance
Every 3 months replace the perforated disk (1) and
the under cup seal (2) of the dispensing group (use only
original spare parts).
8.3.4 SAFETY VALVE check
The Pressure relief valve is one of the main compo-
nents for the machine safety. Therefore, it is important
to carry out the following checks:
First check:
Remove the top grill of the machine;
use pliers to pull the pin of the valve (6) upwards;
if the pin does not move, it probably means the
valve is encrusted with limestone and must be
replaced.
Second check:
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 1.9 bar.
If you notice any malfunction, replace the valve. Use only the
Manufacturer's original Safety Valves.
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8.3.5 PRESSURE VALVE check
First check:
Second check:
1
2
If you notice any malfunction, replace the valve.
8.3.6 NON-RETURN DRAIN VALVE check
The not-return drain valve is an important component
for the correct operation of the machine. Perform the
check as follows:
6
If you notice any malfunction, replace the valve.
Remove the top grill of the machine;
use pliers to push the pin (5) downwards;
if the pin does not move, it probably means the
valve is encrusted with limestone and must be
replaced.
Turn the machine off;
open the steam valves and drain off all
the pressure from inside the boiler;
turn the machine back on and check
for regular closure of the valve.
Activate the dispensing groups for about 30
seconds;
attach a filter holder (7) with a gauge (available
on request) to the dispensing
group;
activate the dispensing group,
and use the pressure gauge (8), to
monitor the pressure as it increases
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 con-
firms proper operation of the
valve, as well as of the gaskets
and solenoid valves seal;
deactivate the deliveries;
check the other dispensing
groups.
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7
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