Instruction Manual

18
D
GB
F
E
96246-07.2014-DGbRu
5| Commissioning
5.7 Shaft seal change
5.8 Start-up
Check that the safety and protection devices (pressure switch, motor protection, electrical
contactprotectionmeasures,etc.)areallfunctioningproperly.
Switch on the compressor and allow to run for a minimum of 10 min.
Checktheoillevel by:Theoilmustbevisibleinthesightglass.
5.9 Avoiding slugging
Topreventslugging:
The complete refrigeration system must be properly designed.
All components must be compatibly rated with each other with regard to output
(particularlytheevaporatorandexpansionvalves).
Suction gas superheat at the compressor input should be min. 7 - 10 K. (check the setting
oftheexpansionvalve).
 Thesystemmustreachastateofequilibrium.
 Particularlyincriticalsystems(e.g.severalevaporatorpoints),measuresarerecommendedsuch
asreplacementofliquidtraps,solenoidvalveintheliquidline,etc.
There should be no movement of coolant whatsoever while the compressor is at
a standstill.
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 Slugging can damage the compressor and cause refrigerant to
leak.
As changing the shaft seal involves opening the refrigerant circuit, this is recommended only if the
seal is losing refrigerant. Replacing the shaft seal is described in the spare part kit concerned.