Assembly | | 01.03 |
The following table is a guideline (coolant temperature 20° C): |
| | | |
Antifrogen N proportion | Kinematic viscosity | Relative pressure loss | |
of the coolant | (mm2/s) | (bar) | |
0 % | 1.05 | 0.95 | |
| | | |
20 % | 1.07 | 1.14 | |
| | | |
30 % | 2.5 | 1.24 | |
| | | |
WARNING
Operation of the units at temperatures below 5 °C is not permissible even if anti-freeze is used.
If anti-freeze is used, it must be ensured that no differences in potential occur in the cooling circuit. If necessary, the components are to be connected to a potential compensation bar.
If less than 20 % ANTIFROGEN N is added, there is an increased danger of corrosion which can reduce the lifetime of the unit.
If anti-freeze is used, the requirements regarding the water-tightness of the circuit are increased because the surface tension of the water–ANTIFROGEN N mixture is approximately 100 times less than that of pure water.
High-quality hot-water-resistant IT seals are suitable as sealing material. Graphite threads can be used to seal the packing glands. In the case of pipe connections where hemp is used, the application of Fermit or Fermit oil has proved to be effective.
If other agents are used, the life of the units can be reduced. Mixing various anti-freeze agents is not permissible under any circumstances.
If anti-freeze is used, the name of the agent, the manufacturer and the mixing ratio must be documented.
NOTE
The safety data sheet is to complied with for anti-freeze!
ANTIFROGEN N (from the Höchst company) is preferred as the anti-freeze agent.
In order to ensure that the good anti-corrosion properties of ANTIFROGEN N–water mixtures have an effect, the concentration must be at least 20 %. The electrical conductivity of the coolant is always increased when anti-freeze is added. The electro-chemical corrosion entailed by this is compensated for by inhibitors contained in the ANTIFROGEN N.
The water–ANTIFROGEN N mixture must be renewed every 3 to 5 years. If sealing strips made of polytetrafluor ethylene are used, leaks can occur.
If other anti-freeze agents are used, they must have an ethylene glycol basis. In addition, they must be approved for use for well-known automobile companies (GM, Ford, Chrysler). Example: DOWTHERM SR-1.
The coolant mixture requires that the water definition given is strictly complied with.
