Huawei NetCol8000-C070 Quick Manual page 14

(Optional) Leakage Test with Nitrogen
3.11
•
If the pressure decreases, apply soapy
water on the pipes, especially pipe
joints to check for any leakage.
•
If the pressure is stable, wrap all pipes
and connectors with thermal insulation
foam.
•
Install a reducing valve at the outlet of
the nitrogen cylinder. The outlet
pressure of the reducing valve must
be not more than 0.8 MPa.
Upflow
3.12 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.
If a cabinet has been disassembled, check that hold hoops on the pipe connectors do not

leak. If there is no water leakage, wrap the hold hoops with thermal insulation foam.
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%
or OPEN). 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.
1. Rotate the chilled water valve to the maximum
openness (OPEN).
2. Check that the needle valves and exhaust valves
on the pipeline are closed.
3. Connect the reducing valve and nitrogen cylinder
to the following needle valve, inject 0.8 MPa (when
the pressure is stable) nitrogen, and leave them for
24 hours.
4. Then, check that the pressure reading on the
pressure gauge remains unchanged.
Downflow
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