Huawei NetCol5000-A-035 - Page 149

NetCol5000-A(025, 035) In-row Air Cooled Smart
Cooling Product
User Manual (600 mm)
5 Power-On Commissioning
Issue 13 (2019-01-15)
Copyright © Huawei Technologies Co., Ltd.
140
Figure 5-3 Vacuumizing the cooling system with low-temperature component
(1) Liquid pipe needle valve
(2) Discharge pipe needle
valve
(3) Low-pressure needle
valve
(4) Low-pressure gauge 1
valve
(5) High-pressure gauge 1
valve
(6) Low-pressure gauge 2
valve
(7) High-pressure gauge 2
valve
(8) Nut
(9) Vacuum pump
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