Huawei NetCol8000-C070 User Manual page 137

NetCol8000-C(070, 130, 190) In-room Chilled Water
Smart Cooling Product
User Manual
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Step 2 Drain all water out of the NetCol8000-C.
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Issue 07 (2021-12-30)
Figure 4-29 The drainage needle valves of the heat exchanger (upflow)
(1) Drainage needle valve 1
(For the downflow units) Remove the plugs from the drainage needle valves
1, 2, 3, and 4 of the heat exchanger, to drain water naturally until no water
flows out.
Figure 4-30 Drainage needle valves of the heat exchanger (downflow)
(1) Drainage needle (2) Drainage needle
valve 1 valve 2
(For the upflow units) Connect a nitrogen cylinder to the drainage needle
valve 1 of the heat exchanger, set the intake pressure to 0.5 MPa, and blow
nitrogen into the valve for 10 minutes so that the water flows out of the
drainage needle valve 2. Then connect the nitrogen cylinder to the drainage
needle valve 2 of the heat exchanger, set the intake pressure to 0.5 MPa, and
blow nitrogen into the valve for 10 minutes, so that the water flows out of
the drainage needle valve 1.
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4 Power-On Commissioning
(2) Drainage needle valve 2
(3) Drainage needle (4) Drainage needle
valve 3 valve 4
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