FusionModule800 Smart Small Data Center
Installation Guide (Six Fans)
Copyright © Huawei Technologies Co., Ltd.
Procedure
Step 1 Connect the pressure gauge and vacuum pump and check that the pressure gauge valves are
all open.
Figure 3-81 Vacuumization
(3) Gas pipe needle
valve
(4) Liquid pipe needle
valve
Step 2 In the beginning, the vacuum pump makes loud noises 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
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 Check that the time for pumping out the air is 80 minutes or longer after making sure that the
cooling system does not leak, and that the pressure displayed on the vacuum pump is less than
or equal to 60 Pa (absolute pressure). When the pressure stops dropping, pump for another 10
minutes.
Step 5 After vacuumization, close all valves of the pressure gauge and the vacuum pump without
disconnecting it. Preserve the pressure for 10 minutes, and verify that the absolute pressure of
the cooling system is not greater than 90 Pa.
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