Pfannenberg Rack Serie Libro De Instrucciones página 12

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.
When using water, please consider the following:
•
Do not use deionized water.
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Do not allow mechanical contamination to get in the water. Use water filters if this could be a problem.
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Water hardness should not be too high. (see below)
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Watch for chemical contamination. If this is to become a problem, treat the water with passivators and/or inhibitors.
•
Do not allow biological, slime bacteria, and algae contamination. If this does happen, treat the water with biocides.
PFANNENBERG recommends that the properties of the water has to be checked in order to identify the quality
Water quality A (No water treatment necessary):
Fresh water from the tap, free of contamination
Ph-level: 7-9
Hardness:<5°dH
Conduction:<50µS/cm
Chlorine:<20 mg/l
Water quality B (Water treatment is recommended):
Fresh water from tap, free of contamination
Ph-level: 7-8, 5
Hardness:<10°dH
Conduction:<300µS/cm
Chlorine:<50 mg/l
Water quality C (Water treatment manditory):
Fresh water from tap, free of contamination
Ph-level: 7-8,5
Hardness:<20°dH
Conduction:<500µS/cm
Chlorine:<100 mg/l
9. Process Oil / Fluids
PFANNENBERG chillers (in the std oil version) are designed to work with the following oil viscosity:
•
Fluids and oil's with viscosity ranging between ISO VG10 and ISO VG32 (*)
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