14 WSN-XIN 21-141 M0V940M13-06
5 Water connections
5.1 Water quality
The water quality must be checked by qualied personnel.
Water with inadequate characteristics can cause:
•
pressure drop increase
•
reduces energy eciency
•
increased corrosion potential
Acceptable water quality values:
SO
4
2-
HCO
3
-
/SO
4
2-
Total Hardness
Cl
-
PO
4
3-
< 100
> 1
4,5 ÷8,5
< 50
< 2,0
NH3 < 0,5
PH 7,5 ÷9,0
ppm
dH
ppm
ppm
ppm
Fe
3
+
Mn
++
CO
2
H
2
S
Temperature
< 0,5
< 0,05
< 50
< 50
< 65
Oxygen content < 0,1
Free Chlorine < 0,5
ppm
ppm
ppb
°C
ppm
ppm
ppm
Provide a water treatment system if values fall outside the limits.
5.2 Risk of freezing
If the unit or the relative water connections are subject to temperatures close to 0°C:
•
mix water with glycol, or
•
safeguard the pipes with heating cables placed under the insulation, or
•
empty the system in cases of long non-use
5.3 Anti-freeze solution
The use of an anti-freeze solution results in an increase in pressure drop.
Make sure that the glycol type utilized is inhibited (not corrosive) and compatible with the water circuit components.
Do not use dierent glicol mixture (i.e. ethylene with propylene).
5.4 Water ow-rate
The project water-ow must be:
•
inside the exchanger operating limits (see the TECHNICAL INFORMATION section)
•
guarantee, also with variable system conditions (for example in systems where some circuits are bypassed in particular situations).
5.5 Flow Switch
The ow switch must be present to ensure shutdown of the unit if water is not circulating.
It has to be installed in a duct rectilinear part, not in proximity of curves that cause turbulences.
A
!
A
A > 5 Ø
Ø
A. minimum distance
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