Manual

20
D
GB
F
E
96020-02.2015-DGbFEI
6| Commissioning
6.7 Decompression valves
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).
CO
2
streaming
out
Fig. 19
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 hammer effects.
Ifthisisthecasechecktheoilreturn!
ATTENTION 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 condi-
tions can occure, which may result in a permanent leak.Always
checksystemforrefrigerantlossafteractivationofpressurerelief
valve!
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 appropriate safety standards.
FailuretoobservecanresultinriskofinjuryfromCO
2
streaming
out of the two decompression valves!
6.6 Start-up
GEA Boc
72636 Fricke