Pfannenberg EB 30 WT - Page 11

English
11
Corrosion protection:
PFANNENBERG recommends that Glycol is also used as a rust inhibitor. The minimum percentage of glycol (in a mixture with
water) recommended by some important glycol supplier (Clariant, Total, Dowfrost, etc..) is between 20% and 30%.
CAUTION: Please contact the glycol supplier to know the minimum percentage needed in order to use
the glycol as rust inhibitor
CAUTION: All the typelabel of the STD Pfannenberg unit are provided with a percentage of glycol of
20%
The percentages of glycol into the mixture is related to the minimum working temperature of the mixture (that must be in line
with the minimum working set point of the unit, please see the technical data of the unit):
Propylene glycol
dilution
Working range temperature
Freezing point
%
Min [°C]
Max [°C]
PP20P
20
+10
+101
-8
PP30P
30
0
+103
-14
PP50P
54
-25
+104
-38
Ethylene glycol
dilution
Working range temperature
Freezing point
%
Min [°C]
Max [°C]
PP20E
20
+10
+102
-8
PP30E
30
0
+103
-15
PP50E
50
-25
+108
-38
CAUTION: The higher the concentration of glycol the lower the amount of heat rejection you will be
able to get out of the fluid.
CAUTION: The type of glycol (propylene or ethylene) must be in conformity with the Standard
requested by the application, please contact the Glycol supplier
.
8.1 Waterquality
To keep the hydraulic circuit correct and trouble-free, it is necessary, to check the water quality and if necessary, carry out water
treatment. The standard circuit of a water chiller is a half open system, that means, part of the water steams/evaporates out
during operation. That means, that the concentration of chloride is getting higher and the system water will cause corrosion on
the installed components.