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18-06-08 PVD3668_GB_GVM_June_2018
3.6.2. Additives for water as cooling media
Please refer to motor technical data for coolant flow rates.
The inner pressure of the cooling liquid must not exceed 5 bars.
The GVM motors can be water or oil cooled. Corrosion inhibitors must be added to the water
to avoid the corrosion. The complete cooling system must be considered to choose the right
additive, this includes: the different materials in the cooling circuit, the chiller manufacturer
recommendations, the quality of the water…
The right additive solution is the responsibility of the user. Some additives like TYFOCOR or
GLYSANTIN G48 correctly used have demonstrated their ability to prevent corrosion in a
closed cooling circuit
For example: Glysantin G48 recommendations are :
- Water hardness: 0 to 20°dH (0 – 3.6 mmol/l)
- Chloride content: max. 100ppm
- Sulphate content: max. 100ppm
Caution: The water quality is very important and must comply with supplier
recommendations. The additive quantity and periodic replacement must
respect the same supplier recommendations.
Select carefully the materials of all the cooling system parts (chiller,
exchanger, hoses, adapters and fittings) because the difference between
material galvanic potential can generate corrosion.
Caution: To avoid the corrosion of the motor cooling system (aluminum or
copper), the water must have anti-corrosion additive (as Glycol).
Caution: The additive choice must take into account the complete cooling
system (chiller or water exchanger recommendations…).
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