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Translation from original instructions
6.9 Vacuum and refrigerant charge
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.
On units fitted with inspectable filter, immediately before starting to make the vacuum, insert the filtering
cartridge in the filter body present in the liquid line. This cartridge is supplied with the unit and located in the
electrical control panel.
Once the vacuum has been obtained, charge the system through the charging port 5/16" SAE placed on the liquid line. Per
-
form charging in liquid form. The tables below show the estimated refrigerant charges for the units and for the connecting
pipes to which will be added the charge contained in the remote exchanger.
As an indication, the charge regarding the remote exchanger can be considered a multiplication of its volume by 0.15.
The final charge may differ slightly depending on the necessary adjustments (see next chapters).
Refrigerant charges* for units without remote exchanger, excluding pipes
Model
Coil type
MCHX - [kg]
Cu/Al - [kg]
3.2
3,6
11
4.2
3,7
11,2
5.2
3,8
11,9
6.2
4,9
16,9
7.2
5
16,9
8.2
8,2
22,8
9.2
8,4
25,5
10.2
8,4
25,5
12.2
8,6
25,5
13.2
8,6
25,5
15.2
14,4
38,3
16.2
14,4
38,3
14.4
13,2
39,8
16.4
13,2
41,6
18.4
21,2
52,2
20.4
21,2
52,2
24.4
21,6
52,8
* The table shows the charges for units with microchannel coil (MCHX) for cooling only operation (LE) with evaporation at
7.5°C and air at 35°C or copper/aluminium (Cu/Al) for reversible operation (LE/HP), under the same conditions as regards
operation in cooling mode and with condensation at 40°C and air at 7°C for operation in heat pump mode.
