Huawei FusionModule500 User Manual page 99

FusionModule500 Smart Mini Data Center
User Manual
Procedure
Step 1 Open the stop valve for the gas pipe of the indoor unit.
Before opening the indoor unit stop valve, ensure that the stop valve on the gas
pipe of the outdoor unit is 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 3.5 MPa.
If the outlet pressure of the reducing valve is greater than 3.5 MPa, components
may be damaged.
Figure 4-29 Leakage test with nitrogen
(1) Nitrogen cylinder
(4) High pressure gauge
Step 3 Inject 3.5 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 valve.
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Issue 02 (2020-12-25)
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(2) Reducing valve
(5) Gas pipe needle valve
4 Installation Guide
Figure 4-29.
(3) Low pressure gauge
(6) Liquid pipe needle valve
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