GEA Bock FK20 - Manual (Page 16)

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5| Commissioning
CAUTION! Wear personal protective clothing such as goggles and
protective gloves!
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.
ATTENTION! Avoid overfilling the system with refrigerant!
To avoid shifts in concentration, zeotropic refrigerant blends
(e.g. R407C) must always be added to the refrigerating plant
in liquid form.
Do not pour liquid refrigerant through the suction line valve on
the compressor.
It is not permissible to mix additives with the oil and
refrigerant.
5.5 Refrigerant charge
5.6 Shaft seal
As changing the seal involves opening the refrigerant circuit, this is recommended only if the seal is
losing refrigerant. Replacing the seal is described in the spare part kit concerned.
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).
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.
5.6.1 Notes on replacing the shaft seal