Lauda ECO Silver E 4 S Operation Manual page 37

When choosing the heat transfer liquid, it must be noted that at the lower limit of the operating temperature
–
range impairment of the heat transfer properties is to be expected due to the increasing viscosity. Therefore, on-
ly use the full operating temperature range where necessary.
The working ranges of the heat transfer liquids and hoses are general figures which can be tightened due to the
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operating temperature range of the devices.
Do not use any contaminated heat transfer liquids. Contamination of the pump chamber may lead to the pump
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jamming and the device then switching off.
Pay attention to the safety data sheet for the heat transfer liquid. Follow the regulations for disposal of the used
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heat transfer liquid.
If required, you can request safety data sheets at any time ( 8.7).
b) Cooling water
Certain requirements are placed on the cooling water with regard to purity. Depending on the cooling water contamina-
tion, a suitable method of purification and/or treatment of the water must be employed. The condenser and the com-
plete cooling water circuit can become blocked, damaged and leaky due to unsuitable cooling water. Extensive conse-
quential damage may arise on the whole cooling circuit. The cooling water quality depends on local conditions. If a fault
or damage occurs due to unsuitable water quality, it is not covered by our guarantee.
Important: Danger of corrosion of the cooling water circuit due to water of unsuitable quality.
Free chlorine (e.g. from disinfectants) and water containing chlorine lead to pitting in the cooling water circuit.
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Distilled, deionized or demineralized water is unsuitable due to its corrosive properties and leads to corrosion in

the cooling water circuit.
Seawater is unsuitable due to its corrosive properties and leads to corrosion in the cooling water circuit.
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Water containing iron or iron particles leads to rust formation in the cooling water circuit.
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Due to the high lime content hard water is not suitable for cooling and leads to calcification in the cooling wa-
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ter circuit.
Cooling water with suspended matter is not suitable.
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Untreated and unpurified river or cooling tower water is not suitable due to its microbiological content (bacte-

ria), which can become deposited in the cooling water circuit.
Putrid water is not suitable.
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