Operating instructions

Preventive Maintenance Manual

5.14 Water filter

Open the water filter and clean it. If there are any deposits in the sieve

check your cooling water quality. To find the location of the water filter

refer to the picture below.

5.15 Water Cooling/Glycol Mix

5.15.1 Cooling Water Quality:

Closed loop system filtered (100 micron filters); the cooling water must

be mechanically clean, optically clear, without deposits, to keep the

cooling circuit free from dirt and organic suspended matter. To avoid

corrosion damages, the following requirements for the cooling water

must be met:

5.15.2 Requirements:

Recommended is the mixing of inhibited Propylenglycol 30 - 50 % Vol.

in DI-Water (e.g.: Heat Transfer Fluid Dowcal 20 from DOW Chemical

Company)

pH value: 7 – 8.2

max. oxygen content: < 4mg/kg (ppm) - due to level of

Propylenglycol

5.16 Water Flow

The cooling water flow is also permanently checked by the software. If

the water is turned off, there must be an error message after some time.

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