Antifreeze, Biocides, Inhibitors - Siemens SINAMICS S120 Manual

Commissioning the cooling circuit
5.3 Coolant for the internal deionized water circuit
5.3.2

Antifreeze, biocides, inhibitors

Table 5- 6 Overview and application of coolant additives
Antifreeze
Biocide*
Antifreeze + biocide*
Inhibitors
* Effectiveness regarding the growth of microorganisms
Antifreeze
Only the following agents can be used as antifreeze:
● Antifrogen N (chemical basis: Ethylene glycol, manufacturer: Clariant) with a percentage
X of 25 % < X ≤ 45 % is the anti-freeze used. Coolants containing 45% Antifrogen N
provide protection down to -30° C.
● Antifrogen L (chemical basis: Propylene glycol, manufacturer: Clariant) with a proportion
X of 25% < X ≤ 48% is the anti-freeze used. Coolants containing 48% Antifrogen L
provide protection down to -30° C.
● Dowcal 100 (chemical basis: Ethylene glycol, manufacturer: DOW) used with a
percentage X of 25 % < X ≤ 45 %. A Dowcal 100 percentage of 45 % provides frost
protection down to -30 °C.
All agents contain anti-corrosion inhibitors which permanently protect the metal in the cooling
system against corrosion.
It is particularly important to ensure that the percentage of antifreeze when topping up the
cooling system always corresponds to the minimum quantity, otherwise the mixture becomes
corrosive.
NOTICE
Material damage caused by incorrectly adding antifreeze
Incorrectly adding antifreeze to the cooling circuit can result in material damage caused by
corrosion and cooling circuit leaks.
• Always mix the coolant outside the cooling circuit before filling it.
• Do not add the individual cooling components one after the other.
124
Used for SINAMICS S120 Cabinet Modules
liquid cooled
Antifrogen N, 25 % < X ≤ 45 %
Antifrogen L, 25 % < X ≤ 48 %
Dowcal 100, 25 % < X ≤ 45 %
Yes
Antifrogen N, minimum quantity 25%
Antifrogen L, minimum quantity 25 %
Dowcal 100, minimum quantity 25 %
Antifreeze already has a biocidal effect in the
minimum concentration specified above.
Required
Fuchs Anticorit S 2000 A
mixed with a ratio of 4 ... 5 %
Please note the following in particular
For Antifrogen L, for the same antifreeze pro-
tection, a higher concentration is required than
for Antifrogen N
Cabinet Modules liquid cooled
Equipment Manual, 04/2020, A5E37067587A