16
impurities through the use cartridge filter (washable, wrapped wire, etc.) of at least 100 microns.
Check the water hardness with which you load and top up the plant circuit. With particularly hard water, in this case it
is necessary to utilize a water softener. For treating water for the plant, please refer to UNI 8065
and the
characteristics reported in the paragraph 7.2.1.
Both for new installations and in case of replacement of a previously installed machine, the system must be washed in
advance in order to prevent any residues from clogging the plate heat exchanger.
Following the damage of the plate heat exchanger for: tampering with the flow switch, continuous manual restarts
after alarm of the flow switch, lack of washing of the system or lack/tampering of the Y filter, the company reserves
the right not to pass the replacement of the component as a guarantee.
7.5.1
Characteristics of water of the plant circuit
To ensure the correct operation of the unit, the water should be adequately filtred (see what is reported at the beginning of this
paragraph) and that the amounts of dissolved substances should minimal. The maximum permitted values are given here below.
MAXIMUM PHYSICAL AND CHEMICAL CHARACTERISTICS ALLOWED BY THE WATER OF
THE PLANT CIRCUIT
PH
7,5 - 9
Electrical conductivity
100 -
500 μS/cm
Total hardness
4,5 – 8,5 dH
Temperature
˂ 65°C
Oxygen content
˂ 0,1 ppm
Maximum glycol content
50 %
Phosphates (PO
4
)
˂ 2ppm
Manganese (Mn)
< 0,05 ppm
Iron (Fe)
< 0,3 ppm
Alkalinity (HCO
3
)
70 – 300 ppm
Chloride ions (Cl-)
< 50 ppm
Sulfate ions (SO4)
< 50 ppm
Sulfide ions (S)
None
Ammonium ions (NH4)
None
Silica (SiO2)
< 30 ppm
7.5.2
Hydraulic circuit type
