GEA Bock F18 - Manual (Page 17)

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5| Commissioning
5.5 Refrigerant charge
5.6 Shaft seal
CAUTION Risk of injury!
Contact with refrigerant can cause severe burns and skin damage.
Avoid contact with refrigerant and wear personal protective
clothing such as goggles and protective gloves!
ATTENTION Avoid overfilling the system with refrigerant!
To avoid shifts in concentration, zeotropic refrigerant blends must
always only be filled into the refrigerating plant in liquid form.
Do not pour liquid coolant through the suction line valve on
the compressor.
It is not permissible to mix additives with the oil and
refrigerant.
ATTENTION Failure to observe the following instructions can cause loss of
refrigerant and damage to the shaft seal!
INFO The shaft seal lubricates and seals 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).
The compressor is equipped with an integrated leak oil drain
hose. Through a drain hose leak oil can be drained.
Dispose of the leak oil in accordance with the valid national re-
gulations.
Make sure that the suction and discharge line valves are open.
With the compressor switched off, add the liquid refrigerant directly to the condenser or receiver,
breaking the vacuum.
If the refrigerant needs topping up after starting the compressor, it can be topped up in vapour
form on the suction side, or, taking suitable precautions, also in liquid form at the inlet to the
evaporator.
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.