GEA Bock HGX46 CO2 T - Manual (Page 30)

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6| Commissioning
6.7 Pressure switch
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.
The machine should reach a state of equilibrium.
Check the
oil level: The oil level must be visible in the sight glass.
After a compressor is replaced, the oil level must be checked again. If the level is too high, oil
must be drained off (danger of oil liquid shocks; reduced capacity of the refrigerating system).
Suitably adjusted pressure switches that switch off the compressor before reaching the maximum
permissible operating pressure must be installed in the system. The pressure reduction for the
pressure switches can occur either at the suction and pressure lines between the shut-off valve
and compressor or at the non-lockable connections for the shut-off valves (connections A and B,
see Chapter 9).
WARNING Ensure that both shut-off valves are open before starting the
compressor!
ATTENTION 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!
6.6 Start-up