NetCol5000-A 42 kW Air Cooled In-row Precision Air
Conditioner
User Manual
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
Procedure
Step 1 Remove the bonnet of the low-pressure needle valve shown in Figure 3-25 and connect the
pressure gauge leather hose to the needle valve.
Figure 3-25 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 flow are generated at first and then
disappear gradually.
Step 3 After the air is exhausted, remove the pressure gauge 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–Step 3.
----End
3.9 Connecting Pipelines
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