Evinox ModuSat - Circuit Filling and Water Treatment; Importance of Water Treatment; Recommended Water Characteristics; Precautions for Water Quality

30
4 CIRCUIT FILLING WATER
The primary circuit is a closed circuit that isn’t connected to the fresh water supply.
Therefore the circuit must be checked for leakage that can compromise the integrity and
correct operation of the unit.
4.1 Water treatment
It’s important to prevent
corrosion and oxidisation so
that all parts work in the best
conditions; therefore it is
necessary to check the quality
of the water circulating in the
circuit. A non correct water
quality increases the chance of
scale build up in the warmer
parts as well as corrosion due
to the presence of dissolved
oxygen.
It is therefore necessary to apply suitable water treatment using approved chemicals.
4.2 Water characteristics
In order to guarantee the optimal performance of the unit check that the water parameters
fit the values in the table above:
SCALE BUILD UP AND CORROSION Topping up the circuit with non treated fresh water
can produce:
 Dissolved oxygen (cause corrosion): install a relief valve, in a higher
position, after each heat generator or on the main fold.
 Carbonates: (produce scale build up): the water top ups must be
reduced to the minimum. It is also necessary to install a flow meter and disable
the automatic filling system.
N.B: Scale and other residues may clog the heat meter causing errors in the energy
consumption calculation.
WATER TREATMENT IS MANDATORY IN THE FOLLOWING CASES:
 Circuits with large capacity that produce large amounts of dissolved
oxygen.
 Frequent top ups due to leaks, repair and maintenance.
 Use of water with non suitable characteristics (check the table)
4.3 Precautions
The correct operation of the unit, and the whole heating system, depends on the water
quality. Often water treatment is considered an unnecessary cost, not considering the
amount of damage that can result from this choice.
The warranty of the ModuSat TP is strictly related to the absolute respect of
the instructions and procedures indicated in this manual
The warranty doesn’t cover damage caused by scale and corrosion due to
unsuitable water treatment.
Check also that the parts and materials use to build the system don’t produce dissolved
oxygen that cause corrosion:
Parameter Recommended
Hardness (TH) About 10 °F
Clorides Up to 100 mg/l
PH 7 to 8,5
Resistivity Higher than 2000 Ohm/cm
Salinity Up to 50 mg/l
Conductivity 200 crs
TDS 0-200 ppm
Iron Up to 1 mg/l
Free copper Up to 1 mg/l