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9 WATER CONNECTION
Water component for corrosion limit on
Copper
PH 7,5 ÷ 9,0
SO
4
-- < 100
HCO
3
- / SO
4
-- > 1
Total Hardness 8 ÷ 15 °f
Cl- < 50 ppm
PO
4
3- < 2,0 ppm
NH
3
< 0,5 ppm
Free Chlorine < 0,5 ppm
Fe
3
+ < 0,5 ppm
Mn ++ < 0,05 ppm
CO
2
< 50 ppm
H
2
S < 50 ppb
Temperature < 65 °C
Oxygen content < 0,1 ppm
Sand
10 mg/L
0.1 to 0.7mm max
diameter
Ferrite hydroxide
Fe3O4 (black)
Dose < 7.5 mg/L 50%
of mass
with diameter < 10
µm
Iron oxide Fe2O3
(red)
Dose < 7.5mg/L
Diameter < 1 µm
Hydraulic system
The pipes must be designed and manufactured to limit pressure
drops as much as possible, i.e. optimise performance of the
system. Keep the following to a minimum:

overall length

number of bends

number of vertical changes of direction
If the unit is to replace an existing unit, clean the system
thoroughly: see Sequence of operations on the following pages
Water quality
The water quality can be checked by qualified personnel.
Water with inadequate characteristics can cause:

pressure drop increase

energy efficiency decrease

corrosive symptom increase
Water features:

within the limits indicated by table
Provide a water treatment system if values fall outside the limits.
Cleanliness
Before connecting the water to the unit, clean the system
thoroughly with specific products effective to remove residues or
impurities that may affect functioning. Existing systems must be
free from sludge and contaminants and protected against build-
ups.
New systems
In case of new installations, it is essential to wash the entire
installation (with the circulator uninstalled) before commissioning
the central installation. This removes residues of the installation
process (welding, waste, joint products...). The system must then
be filled with clean high-quality tap water.
Existing systems
If a new unit is installed on an existing system, the system must
be rinsed to avoid the presence of particles, sludge and waste.
The system must be drained before installing the new unit. Dirt
can be removed only with a suitable water flow. Each section
must then be washed separately. Particular attention must also be
paid to “blind spots” where a lot of dirt can accumulate due to
the reduced water flow. The system must then be filled with clean
high-quality tap water. If, after rinsing, the quality of the water is
still unsuitable, a few measures must be taken to avoid problems.
An option to remove pollutants is to install a filter.
The warranty does not cover
damages caused by limestone
formations, deposits and impurities
from the water supply and/or from
failure to clean the systems.