Wega MyConcept EVDP 2GR - Dispensing group maintenance; SAFETY VALVE check; NON-RETURN DRAIN VALVE check

50 of 76
TECHNICIANS manual
10.3.4 Dispensing group maintenance
Every 3 months replace the
perforated disk (2) and the under
cup seal (1) of the dispensing
group (use only original spare
parts).
10.3.5 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:
• Remove the top grill of the machine;
• use pliers to pull the pin of the valve (3)
upwards;
• if the pin does not move, it probably
means the valve is encrusted with lime-
stone and must be replaced.
If you notice any malfunction, replace the valve. Use only the
Manufacturer's original Safety Valves.
1
2
3
10.3.6 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:
• Activate the dispensing groups for about 30
seconds;
• attach a lter holder (4) with a gauge (available
on request) to the dispensing
group;
• activate the dispensing group,
and use the pressure gauge (5), 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: reach-
ing this value conrms proper
operation of the valve, as well
as of the gaskets and solenoid
valves seal;
• deactivate the deliveries;
• check the other dispensing
groups.
If you notice any malfunction, replace the valve.
4
5