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Water connections
7.2 Prerequisites
This section is intended exclusively for the Installer.
Refer to the Technical data chapter for details.
Follow the safety instructions in the "About R-290 refrige-
rant" a pag. 8.
The hydraulic system and its components must be desi-
gned by a qualied technician who must work according
to the rules of good practice and national regulations.
Check that:
• the maximum water pressure and temperature are com-
patible with the operating limits of the unit
• discharge shut-off valves are installed at the lowest
points of the system so that the circuit can be completely
drained during maintenance
• air vents are installed at the highest points of the system,
in easily accessible places
• the unit is only connected to closed hydraulic circuits.
7.3 Water flow-rate
The design water flow-rate must be:
• inside the exchanger operating limits (see chapter Techni-
cal information)
• guaranteed also with variable system conditions (for
example, in systems where some circuits are bypassed in
particular situations).
If the system capacity is below the minimum flow, bypass the
system as indicated in the diagram.
7.4 Minimum water content
Check that:
• the system complies with the minimum water content
(see the Technical Information chapter)
In process applications or in environments with high ther-
mal load, additional water may be required.
When the system has areas with remotely controlled
valves, the minimum water volume must be guaranteed
even when all valves are closed.
7.5 Water characteristics
The quality of the water used must be in accordance with the
requirements in the following table, otherwise a treatment
system must be provided.
Water component for corrosion limit on Copper
PH (25°C) 7,5 ÷ 9,0
SO4
--
< 100
HCO3
-
/ SO4-- > 1
Total Hardness 8 ÷ 15 °f (4.5-8.5 dH)
Cl- < 50 ppm
PO4
3-
< 2,0 ppm
NH3 < 0,5 ppm
Free Chlorine < 0,5 ppm
Fe3
+
< 0,5 ppm
Mn
++
< 0,05 ppm
CO2 < 50 ppm
H2S < 50 ppm
Temperature < 65 °C
Oxygen content < 0,1 ppm
Sand
10 mg /L 0,1 to 0,7 mm max
diameter
Ferrite hydroxide Fe3O4
(black)
Dose < 7,5 mg/L 50% of mass
with diameter < 10 µm
Iron oxide Fe2O3 (red)
Dose < 7,5 mg/L - Diameter
< 1 µm
7.6 Cleaning
Before connecting the unit to the system:
• clean the system thoroughly with specific products to
remove residues or impurities that could affect operation.
The warranty does not cover damage caused by limesca-
le build-up, deposits and impurities in the water and/or
failure of the hydraulic circuit cleaning system.
Existing systems
If a new unit is installed in an existing system:
• the system must be flushed thoroughly to eliminate any
particles, sludge and waste.
The system must be cleaned before installing the new
unit.
Dirt can be removed only with a suitable water flow
rate.
Each section must be cleaned separately.
Pay particular attention to “blind spots”, where a lot of
dirt can accumulate due to the reduced flow-rate.
If necessary, install an additional filter sized according
to the type of pollutant to be removed.
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