Waterquality - Pfannenberg PC2500 WT CE STD Notice Originale

CAUTION:
PP...P) differs for viscosity and toxicity. Ethylene glycol is less viscous than Propylene one, so it provide a higher
efficiency in heat exchanging, and has better performance at low temperatures. For applications where is
necessary to ensure a non-toxic process, the propylene glycol based fluids are used because of their low toxicity if
ingested; it can be used for example where fluid can enter into accidental contact with beverages, or for industrial
processes for food and beverages processing. In some applications propylene glycol use is mandatory.

7.1 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.
When using water to dilute the mixture, please consider the following:
•
It's recommended to use demineralized/deionized water (DM/DI) but not destilled water.
•
Do not allow mechanical contamination to get in the water. Use water filters if this could be a problem.
•
Water hardness should not be too high. (see below)
•
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
70040-122_01-_-(PC2500_Op._Manual_IT-EN-DE-FR-ES-RU).docx
Ethylene glycol (Pfannenberg Protect PP...E) and Propylene glycol (Pfannenberg Protect
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