Huawei NetCol5000-A050 User Manual page 114

NetCol5000-A050 In-row Air Cooled Smart Cooling
Product
User Manual (1350 mm Depth)
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Step 2 In the beginning, the vacuum pump makes loud noises and exhausts white gas
from the exhaust vent. After 10 minutes, if it still exhausts white gas, observe it
for another 10 minutes because the cooling system may not be sealed properly or
there may be too much residual refrigerant or water 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 noises. Close and open the pressure gauge
alternatively for several times. The position of the pressure gauge pointer and the
noises made by the vacuum pump do not 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 04 (2022-12-15)
Figure 6-1 Vacuumization (without a low temperature component)
(1) Vacuum pump
(3) Low-pressure needle valve
(Optional) If a low temperature component is configured, connect the
pressure gauges and vacuum pump to the low-pressure needle valve,
discharge pipe needle valve, and liquid pipe needle valve, and start
vacuumizing.
Figure 6-2 Vacuumization (with a low temperature component)
(1) Vacuum pump
(4) Low-pressure needle
valve
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(2) Pressure gauge
(4) Discharge pipe needle valve
(2) Pressure gauge 1
(5) Discharge pipe needle
valve
6 Power-On Commissioning
(3) Pressure gauge 2
(6) Liquid pipe needle valve
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