GEA Bock FK30 - Shaft Seal; Avoiding Liquid Shocks

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5| Commissioning
The compressor shaft is sealed to outside using a shaft seal. The sealing element rotates with the
shaft.
The following is especially important to ensuring fault-free operation:
The complete refrigerant circuit must be correctly executed and clean inside.
Heavy shocks and vibrations to the shaft as well as continuous cyclic operation are to be avoided.
The sealing surfaces can stick together during prolonged downtimes (e.g. winter). Therefore, run
the system every 4 weeks for 10 minutes.
5.8 Avoidingliquidshocks
To avoid liquid shocks, the following points should be observed:
The complete refrigeration plant must be correctly designed and executed.
The capacities of all components must be compatible (particularly evaporator and expansion
valve).
Suction gas superheating at the evaporator output should be at least 7 – 10 K (check setting of
the expansion valve).
The system must reach a state of equilibrium.
Particularly in critical systems (e.g. several evaporator points), suitable measures, e.g. use of
liquid traps, solenoid valve in the liquid line, etc. are recommended.
5.7 Shaft seal
ATTENTION Failure to observe the following instructions can cause loss of
refrigerant and damage to the shaft seal!
INFO The shaft seal seals and lubricates with oil. An oil leakage of
0.05 ml per operating hour is therefore normal. This applies
particularlyduringtherun-inphase(200-300h).
Totrapandcollectleakedoil,theFK40isttedwithaninte-
gratedleakoiltrappingdevicewithoilreservoir(P.6,Fig.1).
ATTENTION Slugging can damage the compressor and cause refrigerant to leak.