4.5.1 Checking the Nitrogen Pressure
Context
Before delivery, outdoor units are injected with nitrogen to 0.2–0.6 MPa. Before
connecting pipes, the nitrogen inside pipes must be discharged.
Nitrogen must be discharged; otherwise, air jets emitted during pipe welding may
cause bodily injuries.
Procedure
Step 1 Connect the rubber hose to the pressure gauge, and tighten all pressure gauge
valves.
Step 2 Remove the needle valve bonnet from the outdoor unit, and connect the other
end of the hose to the outdoor unit needle valve, as shown in Figure 4-38.
Figure 4-38 Checking the nitrogen pressure of the outdoor unit
● If the pressure gauge reading is no less than 0.2 MPa, the unit is airtight.
Then open the pressure gauge valve where the hose is connected to discharge
nitrogen. After the discharge is complete, remove the hose and reinstall the
valve bonnet.
● If the pressure gauge reading is less than 0.2 MPa, pipes have leakage points,
and you need to contact Huawei technical support.
----End
NetCol5000-A050 In-row Air Cooled Smart Cooling
Product
User Manual 4 Installation
Issue 08 (2021-09-17) Copyright © Huawei Technologies Co., Ltd. 68
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