Vacuuming procedure
If you need to charge refrigerant, it is necessary to first obtain a sufficiently dry system. Perform
a vacuuming in the high and low side service access valves, which are in the discharge line and
suction line.
1. Connect a manifold valve, a vacuum pump, and a vacuum gauge suitable for R-454B
refrigerant.
2. Operate the vacuuming pump for at least 1 h to 2 h until the vacuum grade is below 130 Pa
(1,000 microns).
Note: If the vacuum grade has not decreased to 130 Pa (1,000 microns) after 2 h, ensure
that there is no leakage and no water in the system, and then continue to vacuum for
another 1 h.
Figure 54: Vacuuming procedure
A Manifold valve for vacuuming C Vacuuming pump
B Refrigerant tank for R-454B D Connection to the unit
75YMAE Air-Cooled Inverter Scroll Chiller and Heat Pump
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