4.8.2 Welding Indoor Unit Pipes
Precautions
Table 4-17 Recommended pipe specications
Pipe Length (m) Recommende
d Gas Pipe
Diameter
Recomme
nded Wall
Thickness
Recommen
ded Liquid
Pipe
Diameter
Recommende
d Wall
Thickness
L ≤ 60 m 7/8 inch 1.2 mm 5/8 inch 1.0 mm
60 m < L ≤ 100 m 7/8 inch 1.2 mm 3/4 inch 1.0 mm
If the one-way pipe length is longer than 100 m, contact Huawei technical
support.
Exhausting Nitrogen
Step 1 Remove the bonnet of the low-pressure needle valve and connect the pressure
gauge leather hose to the needle valve.
Figure 4-61 Exhausting nitrogen
(1) Low-pressure needle valve
(2) Exhaust pipe needle valve (3) Liquid pipe needle valve
Step 2 Open the pressure gauge valve. Loud noises of air ow are generated at rst and
then disappear gradually.
Step 3 After the
airow noise disappears, remove the rubber hose and install the valve
bonnet.
Step 4 Continue exhausting nitrogen from the exhaust pipe needle valve and liquid pipe
needle valve by performing Step 1 to Step 3.
----End
NetCol5000-A050 In-row Air Cooled Smart Cooling
Product
User Manual 4 Installation
Issue 08 (2021-09-17) Copyright © Huawei Technologies Co., Ltd. 88
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