NetCol5000-A 42 kW Air Cooled In-row Precision Air
Conditioner
User Manual
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
Figure 3-37 Charging nitrogen to pipes with installing low-temperature component
(6) Low-pressure needle
valve
(7) Exhaust pipe needle
valve
(8) Liquid pipe needle
valve
Step 2 Open the pressure gauge valves and reducing valve to charge nitrogen into the pipes to
preserve the pressure at 3.0 MPa for 24 hours. The system pressure should not decrease before
and after pressure preservation provided that the ambient temperature is stable. If the pressure
varies due to ambient temperature changes, conduct the pressure preservation test again.
The outlet pressure must be no more than 3.0 MPa. If the outlet pressure is more than 3.0 MPa,
some parts of the system may be damaged.
Step 3 If the pressure decreases, find out and repair the leakage point by using soap water or a
halogen leak detector. If the pressure is preserved properly, exhaust nitrogen from the three
positions shown in Figure 3-25.
For scenarios where a container is transported without refrigerant, keep 0.3 to 0.5 MPa of nitrogen in the
pipe.
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