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4.6
Quality of safety components
When installing a remote emergency button or a motor contactor, the following B10d values are
advised:
• Emergency stop button: 500 000
• Main contactor: 933 333
4.7
Cooling water requirements
General
Cooling water needs to fulfill requirements in order to avoid problems of scaling, fouling,
corrosion or bacterial growth. No general recommendation can encompass the effects of all
combinations of the various compounds, solids and gases typically found in cooling water in
interaction with different materials. Therefore the recommendations formulated in our cooling
water specifications are a general guide line for acceptable coolant quality. However, where strict
limits apply, a statement is made in the specification.
The water requirements refer to untreated water. When water is treated, some parameters will
change. Water treatments should be carried out by a specialized water treatment company,
taking the responsibility for the performance of the treated cooling water and the compatibility
with the materials in the cooling circuit. This includes not only the selection of the appropriate
additives, but also the correct application, monitoring of concentrations and properties, prevention
of sludge formation and maintenance of the system. This applies also to treatment with anti-
freeze products. They should be provided with suitable stabilizers and inhibitors.
Specifications also depend on the criteria mentioned below:
• the type of cooling circuit:
• open
• Single Pass
• recirculation with cooling tower
AIF999999
Text on figure
Customer's motor starter
Separate low voltage supply or transformer
For compressors with motor supply voltage > 690 V
6 Fuses
65
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