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6 | Commissioning
6.6 Start-up
WARNING
Check that the safety and protection devices (pressure switch, motor protection, electrical
contact protection measures, etc.) are functioning properly.
Switch on the compressor and let it run for at least 10 minutes.
Check the oil level: The oil must be visible in the sight glass.
ATTENTION
6.7 Avoiding liquid sluggings
ATTENTION Slugging can result in damage to the compressor and cause
D
To prevent slugging:
GB
The complete refrigeration plant must be properly designed.
F
All components must be compatibly rated with each other with regard to output (particularly the
evaporator and expansion valves).
E
Suction gas superheating at the compressor input should be min. 7 - 10 K (check the setting of
I
the expansion valve).
The system must reach a state of equilibrium.
Particularly in critical systems (e.g. several evaporator points), measures such as
the use of liquid traps, solenoid valve in the liquid line, etc. are recommended.
There should be no movement of refrigerant whatsoever while the compressor is at a
standstill.
6.8 Preventing icing on the compressor
Check compressor regularly for icing!
Icing/condensate formation in the terminal box of the compressor must be prevented through
suitable measures (e.g. suction gas overheating).
34
Ensure that both shut-off valves are open before starting the
compressor!
If larger quantities of oil have to be topped up, there is a risk of
oil impact effects. If this is the case, check the oil return!
refrigerant to leak.
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