Vacuumizing - Huawei NetCol8000-A013 User Manual

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, rubber hose, and nitrogen cylinder. A reducing valve
must be installed on the head of the nitrogen cylinder, as shown in
The outlet pressure of 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 3-39 Leakage test with nitrogen
(1) Nitrogen cylinder
(4) Needle valve of the 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 a 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

3.13 Vacuumizing

Issue 06 (2022-11-25)
NO TICE
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(2) Reducing valve
(5) Needle valve of the liquid
pipe stop valve
3 Installation
Figure 3-39.
(3) Pressure gauge
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