GEA Bock HAX2 CO2 T - Manual (Page 19)

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6| Commissioning
First evacuate the system and then include the compressor in the evacuation process.
Relieve the compressor pressure.
Open the suction and pressure line shut-off valves.
Evacuate the suction and discharge pressure sides using the vacuum pump.
At the end of the evacuation process, the vacuum should be < 1.5 mbar when the pump is switched off.
Repeat this process as often as is required.
Make sure that the suction and pressure line shut-off valves are open.
Filling the liquid refrigerant: It is recommended that the system first be filled
at standstill with gas on the high-pressure side up to a system pressure of at
least 5.2 bar (if it is filled below 5.2 bar with liquid, there is a risk of dry ice
formation). Further filling according to system.
To eliminate the possibility of dry ice formation when the system is operating
(during and after the filling process), the shut-off point of the low-pressure
switch should be set to a value of at least 5.2 bar.
• A refrigerant supplement, which may become necessary after start-up, can be
topped up in vapour form on the suction side.
INFO! Depending upon design of the CO
2
refrigerant filling bottle
(with/without tubing) CO
2
can be filled in liquid after weight or
gaseously.
Use only high-dried CO
2
quality!
ATTENTION! Avoid overfilling the machine with refrigerant!
Do not charge liquid refrigerant into the suction-side on the
compressor.
Do not mix additives with the oil and refrigerant.
WARNING! Never exceed the max. permissible pressures while charging.
Precautions must be taken in time (eg. operating auxiliary conden-
sing unit for standstill pressure control or high pressure stage of
the cascade).
CAUTION! Wear personal protective clothing such as goggles and protective
gloves!
6.5 Refrigerant charge