27
3�13 Filling the plant
have been completed.
-
After the system has been loaded, the tap must be re-
turned to its original position.
3�13�1 Preliminary warnings
All operations must be carried out with the machine
stopped and disconnected from the power supply.
If an external auxiliary pump is used, it must be switched
The operating pressure of the plant must not exceed
during testing, it is advisable to raise the test pressure
and then discharge it later to reach the correct working
pressure. If the pressure exceeds 3 bar, the safety valve
opens and discharges the excess water outside.
3�13�2 Water quality requirements
The quality of the water used must comply with the require-
ments set out in the following table; otherwise, a treatment
system must be provided.
Plant water reference values
pH
6,5 ÷ 7,8
Electrical conductivity
µS/cm 250 ÷ 800
Total hardness
°F 5 ÷ 15
Total Iron
ppm 0,2
Manganese
ppm < 0,05
Chlorides
ppm < 250
Sulphur ions
none
Ammonia ions
none
Well or groundwater not coming from an aqueduct
should always be carefully analysed and, if necessary,
conditioned with appropriate treatment systems.
A water softening plant must be used if the initial water
hardness exceeds the value indicated in the table.
An excessive water softening (total hardness < 1.5
mmol/l) could generate corrosive phenomena in con-
tact with metallic elements (piping or parts of the boil-
Check the chloride concentration at the outlet after res-
in regeneration.
Introducing acids into the washing circuit is forbidden.
Constantly or frequently topping up the plant is forbid-
den because this can damage the heat exchanger of
the appliance.
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