Appendix D: Onsite Refrigerant Charging
Appendix D: Onsite Refrigerant
Charging
Note: Your may charge the system with dry nitrogen to locate leak. Units may also be charged with nitrogen
from factory instead of refrigerant if air freighted or otherwise required by law.
A．Exhaust the Nitrogen Gas in the System
1. The unit will be charged with nitrogen gas (0.03-0.05MPa/4.35-7.25psi) before shipment.
2. Before vacuuming, open the Shrader valve slowly to discharge the nitrogen gas from the system.
3. Open all right-angle valve in the system to discharge all nitrogen gas in the system.
4. Connect the unit with vacuum pump until the gauge pressure reaches 0MPa (0psi).
B. Vacuuming
1. Connect the 3-way air conditioning diagnostic manifold gauge (3-way gauge) to the discharge/suction
side of the refrigeration system. Connect the port in the middle of the gauge to the vacuum pump.
2. Confirm that there will be no leakage between the pipe and the gauge.
3. Turn on the power of the vacuum pump and open the discharge/suction valve on the 3-way gauge and
the system check valve.
4. Different units require different degree of vacuum and time of vacuum. See table below as a reference.
5. When the degree of vacuum and time of vacuum is satisfied, close the discharge/suction valve on the 3-
way gauge. Turn off the vacuum pump.
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