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6.8 Vacuum of the system
Open the taps of the unit and evacuate the pre-charge of nitrogen and helium before completing the refrigerant connections.
Do not leave the refrigerant circuit open for more than 15-30 min as the high hygroscopic nature of the oil can cause it to
absorb moisture that would be detrimental to the circuit.
Carry out the vacuum of the entire system with a high vacuum pump, able to reach 0.1 mbar of residual pressure. Connect
the vacuum pump to several points of the refrigerant circuit in order to ensure better evacuation.
Never use the compressor as a vacuum pump, doing so will invalidate the warranty.
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Translation from original instructions
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