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Translation from original instructions
5.7 Vacuum and refrigerant charge
Open the taps of the indoor unit and evacuate the pre-charged nitrogen before completing the refrigerant connections. Do
not leave the refrigerant circuit open for more than 15-30 min as the high hygroscopic capacity of the oil may cause the
absorption of moisture 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.
Once the vacuum has been obtained, load the system from the charging socket 5/16 "SAE placed on the liquid line. Perform
charging in liquid form. Table 2 shows the estimated refrigerating charges for indoor units and capacitors, to which it is ne
-
cessary to add the charge contained in the connecting lines. The final charge could differ slightly according to the necessary
adjustments (see subsequent chapters).
