Avoiding Liquid Shocks - BOCK FK40 Series Assembly Instructions Manual

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.
T he 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
ATTENTION
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
D
valve).
GB
Suction gas superheating at the evaporator output should be at least 7 – 10 K (check setting of
the expansion valve).
F
The system must reach a state of equilibrium.
E
P articularly 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.
PT
I
TR
Ru
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Slugging can damage the compressor and cause refrigerant to
leak.