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Preparations for use
4.6 Coolant specification
4.6.3
Inhibitors, anti-freeze, biocides
You can use the following anti-freeze, inhibitors and biocides in the stainless steel cooling
circuit:
Table 4-5
Overview and application of coolant additives
Inhibitor without anti-
freeze effect
Anti-freeze protection
Biocide*
Antifreeze + biocide*
* Effectiveness regarding the growth of microorganisms
Inhibitor without anti-freeze effect
If you use inhibitors without any antifreeze effect, then it is not permissible that there is any
magnesium carbonate in the cooling/water used.
Only use the NALCO TRAC100 inhibitor from the Nalco company in the ratio 0.2 % up to
0.25 %. Control Kits can be ordered from Nalco to check the inhibitor concentration.
Anti-freeze
All antifreeze agents contain corrosion protection inhibitors, which permanently protect the
cooling system against corrosion. You can use the additives listed above as anti-freeze agent:
NOTICE
Corrosive mixture
Top up with antifreeze to comply with the minimum concentration, otherwise a mixture is
obtained that has a corrosive effect. The cooling system can be damaged.
● Never mix inhibitors and anti-freeze.
36
Anti-freeze used
Not necessary
● Antifrogen N: 20 % < X ≤ 45 %
A 45 % concentration provides frost protection
down to -15 °C.
● Antifrogen L: 25 % < X ≤ 48 %
A 48 % concentration provides frost protection
down to -15 °C.
● Varidos FSK: 20 % < X ≤ 45 %
A 45 % concentration provides frost protection
down to -15 °C.
Yes
● Antifrogen N, minimum quantity 20 %
● Antifrogen L, minimum quantity 30 %
● Varidos FSK, minimum quantity 30 %
An Antifrogen N antifreeze concentration of >20 %
provides an adequate biocidal effect.
With Antifrogen L and Varidos FSK, 30 % is required
in order to achieve the same effect.
Please note the following in particular
Inhibitor, 0.2 ... 0.25 % by volume!
● With Antifrogen L, for the same
antifreeze protection, a higher
concentration is required then for
Antifrogen N
Cooling circuit with open pressurizer
Operating Instructions 01/2019
SIMOTICS FD 1LN1
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