Huawei NetCol8000-A013 User Manual page 65

NetCol8000-A013 In-room Air Cooled Smart Cooling
Product
User Manual (800 mm Width)
Before opening the indoor unit stop valves, ensure that the stop valves for the gas pipe and
liquid pipe of the outdoor unit are closed.
Step 2 Connect the pressure gauge, leather hose, and nitrogen cylinder. A reducing valve must be
installed on the head of the nitrogen cylinder, as shown in
the reducing valve must not exceed 3.0 MPa.
If the outlet pressure of the reducing valve is greater than 3.0 MPa, components may be
damaged.
Figure 3-40 Leakage test with nitrogen
(1) Nitrogen cylinder
(4) Needle valve of gas pipe stop
valve
Step 3 Inject 3.0 MPa nitrogen and preserve the pressure for 24 hours. The system pressure should
stay constant under unchanging ambient temperature conditions. If there is considerable
temperature change and the pressure changes, perform the test again.
Step 4 If welding defects exist, locate and repair the leak point. If the pressure does not change,
exhaust the nitrogen through the injection needle valves.
----End
Issue 05 (2019-12-20)
(2) Reducing valve
(5) Needle valve of liquid pipe stop
valve
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3 Installation Guide
Figure 3-40. The outlet pressure of
(3) Pressure
gauge
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