Valve group
The valves serve to ensure safety and proper machine
operation.
Safety valve
The safety valve serves to eliminate the air
in the boiler during the heating of the ma-
chine.
Pressure relief valve
The pressure relief valve ensures that the
pressure in the boiler doesn’t exceed 1.9
bars. In case of a malfunction, the capa-
city of the valve is likely to eliminate all the
excess pressure in the boiler.
Expansion – one-way valve
This device consists of an expansion valve and a one-
way valve.
expansion valve: the cold water sent from the pump to
the heat exchangers is heated. This heating causes an
increase in the volume of the water. To limit pressure in-
creases in the hydraulic circuit, the valve limits the ma-
ximum internal pressure in the circuit to 12 bars.
one-way valve: its function is to prevent the backflow of
the water from the exchangers to the hydraulic circuit.
Attention
Check the valves regularly as indicated in chapter
“Inspections and maintenance”.
Attention
Do not change, eliminate or by-pass the safety de-
vices in order to not cause serious risks to health
and safety.
2.3. Residual risks
The careful hazardous analysis performed, has allowed
most of the risks connected with operating and mainte-
nance machine conditions to be eliminated. lavazza re-
minds the user that the instructions, procedures and
recommendations contained in this manual should be
strictly followed, and comply with the safety rules in
force, including the use of provided protection devices,
both integrated in the machine and individual.
This chapter illustrates the risks that the user may incur
if he does not comply with the specific safety rules as
described in this booklet.
- The machine must be connected to an earthed instal-
lation.
If it is not done, the appliance can become a source of
dangerous electrical discharges as it is no longer able
to discharge electricity to earth.
- Be careful with the steam, autosteamer and hot water
pipes.
during use the steam, autosteamer and hot water
pipes may overheat, thus becoming a source of dan-
ger.
handle these parts carefully.
- never direct steam or hot water jets directly on parts of
the body.
- do not work on the machine when it is powered.
Before carry out any operations on the machine, di-
sconnect it from the electrical network.
- do not use water jets for washing any part of the ap-
pliance because running water can seriously damage
electrical and electronic components.
- never work on the hydraulic system before having em-
ptied it.
all operations regarding the hydraulic system and its
boiler have to be avoided when there is still water and
pressure in the system. You must therefore empty it
beforehand, closing the mains tap and dry-running the
brewing unit, hot water pipe, cappuccinatore or steam
pipe for a short time.
Switch the machine off.
Maintenance manual for technical assistance
7
Manual code 10066846 / Rel. 0.00 / March 2012
One-way
valve
Expansion
valve