50
22.05 – 4037365_03
NLC H 0280-1250 (01-02-03-04)
Water filter: Installation in the immediate vicinity of the heat exchanger is man-
datory,.
Components as standard
1
Plate heat exchanger
2
Water temperature sensors (IN/OUT)
3
Air drain valve
4
Pressure relief valve
5
Pump
6
Flow shut-off valves
7
Expansion vessel
8
Storage tank
9
Drain valve
Components not provided and responsibility of the installer
10 Water filter (MANDATORY)
11 Anti-vibration joints
12 Pressure gauge
13 Flow switch (MANDATORY)
14 Flow shut-off valves
1
2
2
11
11
3
4
10
13
8
3
6
4
7
14
12
12
9
P1-P3
5
P2-P4
9
5
5
Water characteristics
System: Chiller with plate heat exchanger
PH
7,5 - 9
Total hardness
4,5 - 8,5 °dH
Temperature
< 65 °C
Oxygen content
< 0,1 ppm
Max. glycol amount
50 %
Phosphates (PO₄)
< 2ppm
Manganese (Mn)
< 0,05 ppm
Iron (Fe)
< 0,3 ppm
Alkalinity (HCO₃)
70 - 300 ppm
Chloride ions (Cl-)
< 50 ppm
Sulphate ions (SO₄)
< 50 ppm
Sulphide ion (S)
None
Ammonium ions (NH₄)
None
Silica (SiO₂)
< 30 ppm
It is of fundamental importance to keep the oxygen concentration in
the water under control, especially in open vessel systems. This type
of system, in fact, is very sensitive to the phenomenon of extra-oxy-
genation of the water (an event that can be encouraged by the incor-
rect positioning of some components). This phenomenon can trigger
corrosion processes and subsequent drilling of the heat exchanger
and pipes.
