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2.6. Oil
The components of the compressor subject to friction are lubricated by oil, which is added to the
refrigerant in the factory. The polyolester-160SZ is used for this. The oil is soluble in the
refrigerant and is distributed with it throughout the refrigeration circuit. The total oil quantity of
the respective unit is given in the technical data. A corresponding safety data sheet can be
obtained from our KKT chillers Service Team (see Table 1: Contact details).
2.7. Filter dryer
The task of the filter dryer is to absorb any contamination or moisture from the refrigerant circuit.
Both refrigerant and oil are hygroscopic. When the refrigeration circuit is installed the oil can
absorb moisture. This moisture can cause corrosion and has a negative effect on the cooling
process. The filter dryer bonds this moisture and also has a mechanical filter effect. If work is
carried out on the refrigeration circuit requiring it to be opened, the filter dryer (cBoxX 30 –
cBoxX100) respectively the filter cartridge (cBoxX 120 – cBoxX 200) must be replaced.
2.8. Pressure sensors
The pressure sensors used are compact pressure transmitters with piezoresistive measuring cell.
The sensors register the system pressure continuously in different places within the refrigerant
and cold water circuit. The values are used to control the system and for visualisation at the
controller display.
2.9. Temperature sensors
The temperature sensors used are equipped with a platinum measuring cell. The sensors register
the temperature continuously in different places within the refrigerant and cold water circuit. The
values are used to control the system.
2.10. Control unit/ main circuit board
The control unit is programmed in the factory. All system readings and information come together
on it. In addition, the electrical components are controlled via algorithms.
2.11. Display
The display is used to visualise the information required by the operator and the system
processes. It is also possible to make entries at it. The display communicates with the control
unit. Further information on operation is given in Chapter 8.5 Control panel).
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