Huawei NetCol5000-C030 Quick Manual page 8

4.6
Injecting Water to Expel Nitrogen
Clean the main pipe beforehand to avoid blockage of the heat
exchanger due to foreign construction matter. Close the isolation
valve on the water inlet and outlet pipes before the cleaning.
1. Open the general water supply valve.
2. Press the button on the side of the actuator and
manually rotate the valve handle to the maximum in the
specified direction. Check that the chilled water valve is
in the open state (100%).
3. Slowly open the exhaust valve to let out gas.
4. Adjust the gas releasing speed until no gas flows out of
the valve. Then close the exhaust valve.
5. Manually close the chilled water valve.
4.7
(Optional) Leakage Test with Water
If the leakage test has been done with nitrogen, skip the test with water.
Manually open the chilled water valve. Inject water to 0.8 MPa, and preserve the pressure for 24
hours. Then connect a pressure gauge to a needle valve on the pipeline to measure the pressure.
If the reading remains unchanged, the pipe is not leaking. You can perform the following
operations.
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