Huawei NetCol5000-A User Manual page 71

NetCol5000-A 42 kW Air Cooled In-row Precision Air
Conditioner
User Manual
(1) Nitrogen cylinder
(4) Pressure gauge 2
(7) Exhaust 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
For scenarios where a container is transported without refrigerant, keep 0.3 to 0.5 MPa of nitrogen in the
pipe.
----End
Issue 01 (2017-07-27)
Figure 3-37 Charging nitrogen to pipes with installing low-temperature component
Figure 3-25.
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Copyright © Huawei Technologies Co., Ltd.
(2) Reducing valve
(5) Connection nut
(8) Liquid pipe needle
valve
3 Installation Guide
(3) Pressure gauge 1
(6) Low-pressure needle
valve
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