Water Quality - Panasonic 140 Installation And Maintenance Manual

10.6.3. Leaving water protection
In case of low temperature setpoint or reduced water fl ow, the water loop must be protected against icing during the operation
of the unit. Concentration must comply with the minimum water temperature of the installation. The choice of the type of glycol
shall take in consideration the increase of pressure drops.
For instance, we recommend to protect a -10°C setpoint down to -18°C. Using MPG, that protection is achieved with a 35%
concentration.

10.7. Water quality

The water must be analyzed; the hydraulic network system installed must include all elements necessary for water treatment:
fi lters, additives, intermediate exchangers, drain valves, vents, check valves, etc., according to the results of the analysis.
The ECOi-W must not run on a network with open loops, this is likely to cause incidents related to
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oxygenation, or with non treated table water.
Using improperly treated or non treated water in the ECOi-W may cause scaling, erosion, corrosion, algae or sludge deposits in
the exchangers. Refer to a specialist skilled in water treatment to determine any treatment to apply. The manufacturer will not
be held liable for damages caused when non-treated or improperly treated water, demineralized water, salty water or sea water
are used.
Apply the following guidelines:
• No NH + ammonium ions in the water, highly detrimental to copper. <10mg/l
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• Cl- chloride ions are detrimental to copper with a risk of puncture by pitting corrosion. <10mg/l.
2-
• SO sulphate ions may cause perforating corrosion. < 30mg/l.
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• No fl uoride ions (<0,1 mg/l)
• No Fe 2+ and Fe 3+ ions, particularly in case of dissolved oxygen. Fe< 5mg/l with dissolved oxygen < 5mg/l. The presence of
these ions with dissolved oxygen indicates corrosion of steel parts, likely to generate corrosion of copper parts under Fe
deposits, particularly in the case of multitubular exchangers.
• Dissolved silica: silica is an acid element of water and may also cause corrosion. Content < 1mg/l.
• Water hardness: Values between 10°fH and 25°fH may be recommended. This facilitates scaling deposits likely to limit
copper corrosion. Excess TH values may lead to clogging the pipes.
• TAC<100
• Dissolved oxygen: Prevent any sudden change in the water's oxygenation conditions. Also, avoid deoxygenating water by
sparging inert gas as well as overoxygenating it by pure oxygen sparging. Disturbing oxygenation conditions destabilizes
copper hydroxides and particle salting-out.
• Electrical Resistivity - Conductivity: The higher the resistivity, the slower the corrosion. Values above 3000 ohm/cm are
preferred. A neutral environment favours maximum resistivity. For electrical conductivity, values around 200-600 S/cm can be
recommended.
• pH: neutral pH at 20°C (7 < pH < 8)
If the water circuit is to be drained for a time exceeding one month, the circuit must be fully charged with
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nitrogen to prevent any risk of corrosion by differential venting.
The manufacturer is not liable for recommendations in terms of water treatment (call a specialized
company). However, this matter has a critical nature, and particular care must be given to ensure that the
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type of treatment applied is effective. The liability of the manufacturer or its representative will not be sought
when non-treated water or non-compliant quality water is used.
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