Huawei NetCol8000-C070 Quick Manual page 9

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3.8 Leakage Test with Water
• To avoid blockage of the heat exchanger in the smart cooling product due to foreign
matter from the main pipe during the construction, you are advised to clean the main pipe
before water is supplied to the smart cooling product. Turn off the isolation valves on the
water inlet and outlet pipes before the cleaning and turn them on afterwards.
• Open the exhaust valve of each heat exchanger to exhaust nitrogen onsite.
1. Open the general water supply valve.
2. Verify that the chilled water valve is open (100%). If not, press the button on the side of the
actuator, and manually rotate the valve handle to the maximum.
3. Slowly open the exhaust valve to discharge air.
4. Adjust the air exhausting speed until no air flows out of the valve. Then close the exhaust
valve.
5. (If a leakage test with nitrogen has been performed, skip this step.) Raise the water pressure
in the chilled water pipe to 0.8 MPa. If no leakage occurs after 30 minutes, retain the
pressure for 24 hours. The expected result is that the pressure drop is less than 0.01 MPa and
the pipe does not leak.
6. Release the pressure in the pipes, and manually close the chilled water valve.
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