Nitrogen must be discharged; otherwise, air jets emitted during pipe welding may
cause bodily injuries.
Procedure
Step 1 Connect the 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 4-34 or
Figure 4-35.
Figure 4-34 Checking the outdoor unit pressure (for NetCol500-A060)
Figure 4-35 Checking the outdoor unit pressure (NetCol500-A110)
● 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.
NetCol8000-A(045, 055, 060, 090, 120) In-room Air
Cooled Smart Cooling Product
User Manual 4 System Installation
Issue 05 (2020-10-10) Copyright © Huawei Technologies Co., Ltd. 81
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