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8.1
8.1
8.1
8.1
Maintaining the refrigerant circuit
Maintaining the refrigerant circuit
Maintaining the refrigerant circuit
Maintaining the refrigerant circuit
As a hermetically sealed system, the refrigerant circuit has been filled in the factory with the required
amount of refrigerant, tested for leaks and subjected to a function test run. Maintenance tasks on
the refrigerant circuit must only be undertaken by a specialist refrigeration company. We recommend
a maintenance contract that includes an annual inspection of the refrigerant circuit (European regu-
lation EC No. 842/2006 / fluorinated greenhouse gases).
8.2
8.2
8.2
8.2
Water quality
Water quality
Water quality
Water quality
In case of cooling of/with water + glycol or similar fluids in the open circuit, always observe the fol-
lowing points:
Regularly clean solid residues (from any filters used),
Algae and deposits, as well as
Corrosion
can cause damage to the cooling unit. Residues will always impair the performance of the cooling
unit. Without water treatment it is seldom possible to achieve satisfactory conditions. By means of
regular monitoring of the quality of the cooling medium and cooling medium treatment, you must
ensure that deposits and corrosion are avoided, even under extreme conditions.
There are specific cooling medium requirements depending on the type of equipment being cooled.
A suitable process must then be used to prepare and/or maintain the cooling medium to suit the
level of contamination and the size and design of the cooling system. The most common types of
contamination and most frequently used techniques to eliminate them in industrial cooling are:
Mechanical contamination:
Mechanical contamination:
Mechanical contamination:
Mechanical contamination:
Filtering of the cooling medium via mesh filter, gravel filter, cartridge filter, or pre-coated filter
Excessive hardness:
Excessive hardness:
Excessive hardness:
Excessive hardness:
Softening of the cooling medium using ion exchange
Moderate content of mechanical contaminants and hardeners:
Moderate content of mechanical contaminants and hardeners:
Moderate content of mechanical contaminants and hardeners:
Moderate content of mechanical contaminants and hardeners:
Addition of stabilisers and/or dispersing agents to the water
Moderate content of che
Moderate content of che
Moderate content of che
Moderate content of chemical contaminants:
mical contaminants:
mical contaminants:
mical contaminants:
Addition of passifiers and/or inhibitors to the cooling medium
Biological contaminants, slime bacteria, and algae:
Biological contaminants, slime bacteria, and algae:
Biological contaminants, slime bacteria, and algae:
Biological contaminants, slime bacteria, and algae:
Addition of biocides to the cooling medium
Note!
Note!
Note!
Note!
The cooling medium thickens due to evaporation. You can return the values to within
the usual ranges by completely replacing the cooling medium. Only use distilled or de-
ionised water in cooling units specified for such use (see chapter 11).
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