GEA Bock HG4 CO2 - Manual (Page 18)

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6| Commissioning
WARNING When the compressor is not running, depending on ambient
temperature and amount of refrigerant charge, it is possible that
the pressure may rise and exceed permitted levels for the com-
pressor. Adequate precautions must be taken to prevent this hap-
pening (e.g. using a cold storage medium, a receiver tank, a se-
condary refrigerant system, or pressure relief devices).
6.1 Preparations for start-up
The compressor has undergone trials in the factory and all functions have been tested. There are
therefore no special running-in instructions.
Check the compressor for transport damage!
INFO To protect the compressor against inadmissible operating conditions,
high pressure and low pressure pressostats are mandatory on the
installation side.
6.2 Pressure strength test
The compressor has been factory-tested for pressure resistance. The following must be observed if
the entire plant is subjected to an additional pressure strength test:
Test the refrigeration circuit according to EN 378-2 or a corresponding safety standard.
6.3 Leak test
Carry out the leak test of the refrigerating system in accordance with EN 378-2 or a corresponding
safety standard without including the compressor.
DANGER Risk of bursting!
The compressor must only be pressurised using nitrogen (N
2
).
Never pressurise with oxygen or other gases!
The maximum permissible overpressure of the compressor must
not be exceeded at any time during the testing process (see name
plate data)! Do not mix any refrigerant with the nitrogen as this
could cause the ignition limit to shift into the critical range.
DANGER Risk of bursting!
Do not mix any refrigerant with the nitrogen (N
2
) as this could cau-
se the ignition limit to shift into the critical range.