Huawei NetCol5000-A035 User Manual page 151

NetCol5000-A(025, 035) In-row Air Cooled Smart
Cooling Product
User Manual (600 mm Width)
Figure 5-3 Vacuumizing the cooling system with low-temperature component
(1) Liquid pipe needle valve
(4) Low-pressure gauge 1 valve (5) High-pressure gauge 1
(7) High-pressure gauge 2
valve
Step 2 In the beginning, the vacuum pump makes loud noise and exhausts white smoke
from the exhaust vent. After 10 minutes, if it still exhausts white smoke, observe it
for another 10 minutes because the cooling system may not be sealed properly or
there may be too much refrigerant or water residues in the cooling system.
Step 3 After 20 minutes, the pressure gauge pointer should be in the negative area and
the vacuum pump makes small noise. Close and open the pressure gauge
alternatively for several times. The position of the pressure gauge pointer and the
sound made by the vacuum pump do not obviously change. Otherwise, the
cooling system may not be sealed properly.
Step 4 Vacuumize the cooling system for at least 80 minutes after checking that the
cooling system does not leak. The pressure displayed on the vacuum pump should
be less than or equal to 60 Pa (absolute pressure). When the pressure stops
Issue 17 (2020-10-22)
(2) Discharge pipe needle
valve
valve
(8) Nut
Copyright © Huawei Technologies Co., Ltd.
5 Power-On Commissioning
(3) Low-pressure needle valve
(6) Low-pressure gauge 2 valve
(9) Vacuum pump
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