User Manual

20
D
GB
F
E
96031-02.2015-DGbF
6| Commissioning
Thecompressoristtedwithtwodecompressionvalves.Onevalveeachonthe
suctionanddischargeside.Ifexcessivepressuresarereached,thevalvesopen
and prevent further pressure increase.
Thereby CO
2
is blown off to the ambient (see also Chapter 7.6)!
Intheeventthatapressurereliefvalveactivatesrepeatedly,checkvalveand
replaceifnecessaryasduringblow-offextremeconditionscanoccure,which
mayresultinapermanentleak.Alwayschecksystemforrefrigerantlossafter
activation of pressure relief valve!
6.7 Decompression valve
CO
2
streaming
out
Fig. 21
6.6 Start-up
WARNING! Ensure that both shut-off valves are open before starting the
compressor!
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).
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!
The decompression valves do not replace any pressure switches and the
additional safety valves in the system. Pressure switches must always be installed
inthesystemanddesignedoradjustedinaccordancewithEN378-2orappro-
priate safety standards.
FailuretoobservecanresultinriskofinjuryfromCO
2
streaming out of the two
decompression valves!