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D-EIMAC01706-18EN- 14/32
Water treatment
Before putting the unit into operation, clean the water circuit.
The evaporator must not be exposed to flushing velocities or debris released during flushing. It is recommended that a
suitably sized bypass and valve arrangement is installed to allow flushing of the piping system. The bypass can be used
during maintenance to isolate the heat exchanger without disrupting flow to other units.
Any damage due to the presence of foreign bodies or debris in the evaporator will not be covered by warranty
.
Dirt, scales, corrosion debris and other material can accumulate inside the heat exchanger and reduce its heat exchanging
capacity. Pressure drop can increase as well, thus reducing water flow. Proper water treatment therefore reduces the risk
of corrosion, erosion, scaling, etc. The most appropriate water treatment must be determined locally, according to the type
of system and water characteristics.
The manufacturer is not responsible for damage to or malfunctioning of equipment caused by failure to treat water or by
improperly treated water.
Table 1 - Acceptable water quality limits
pH (25°C)
6.8
8.0
Total Hardness [mg CaCO
3
/ l]
200
Electrical conductivity [
S/cm] (25°C)
800
Iron [mg Fe / l]
1.0
Chloride ion [mg Cl
-
/ l]
200
Sulphide ion [mg S
2 -
/ l]
0
Sulphate ion [mg SO
2
4
-
/ l]
200
Ammonium ion [mg NH
4
+
/ l]
1.0
Alkalinity [mg CaCO
3
/ l]
100
Silica [mg SiO
2
/ l]
50
Operation limits
Operation out of the mentioned limits may damage the unit. In case of any doubt contact the manufacturer representative.
To ensure correct operation of the unit, the value of the water flow in the evaporator must be within the declared range for
that unit. A water flow rate much lower than the nominal value shown at the unit selection point can cause problems with
freezing, fouling and poor control. A water flow much higher than the nominal value shown at the unit selection point results
in an unacceptable loss of load and excessive erosion and vibration of the tubes which can cause them to break;
refer to
the Chiller Selection Software (CSS) for the correct range of range of each unit.
Fig. 8 - Multi V-Silver Operational limits