Huawei NetCol5000-A User Manual page 149

NetCol5000-A(025, 035) In-row Air Cooled Smart
Cooling Product
User Manual (600 mm)
Figure 5-3 Vacuumizing the cooling system with low-temperature component
(1) Liquid pipe needle valve
(4) Low-pressure gauge 1
valve
(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
Issue 13 (2019-01-15)
(2) Discharge pipe needle
valve
(5) High-pressure gauge 1
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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