4.8.2 Welding Indoor Unit Pipes
Precautions
Table 4-6 Recommended pipe specications
Pipe Length (m) Recommended Gas Pipe
Diameter
Recommended Liquid
Pipe Diameter
L ≤ 60 m 7/8 inch (22.22 mm) 5/8 inch (15.88 mm)
60 m < L ≤ 100 m 1 inch (25.4 mm) 3/4 inch (19.05 mm)
If the one-way pipe length is longer than 100 m, contact Huawei technical
support.
Refrigerant pipes can be routed from the bottom or side. Select the pipe routing
based on the actual situation.
Exhausting Nitrogen
Before welding refrigerant pipes, fully exhaust nitrogen from the refrigerant pipes
to avoid explosion and injuries.
Step 1 Remove the bonnet of the low-pressure needle valve shown in Figure 4-56 and
connect the pressure gauge leather hose to the needle valve.
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. 99
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