Procedure
Step 1 Connect a pressure gauge to the gas pipe needle valve (low pressure, thick pipe)
and liquid pipe needle valve (high pressure, thin pipe) of the indoor unit, and
connect a vacuum pump.
The low ambient kit has a check valve. Vacuumize through the liquid inlet pipe
before the check valve and the liquid outlet pipe.
Step 2 Check that all pressure gauge valves are open.
Figure 4-40 Vacuumization (indoor unit)
(1) Vacuum pump
(2) Pressure gauge (3) Gas pipe needle
valve
(4) Liquid pipe needle
valve
Step 3 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 4 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 5 Check that the time for vacuumization is 80 minutes or longer after ensuring 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 6 After vacuumization, close all valves of the pressure gauge and the vacuum pump
without disconnecting the pump. Preserve the pressure for 10 minutes, and verify
that the absolute pressure of the cooling system is not greater than 90 Pa.
If the minimum reading of the pressure gauge is greater than 60 Pa (absolute pressure),
ensure that the pointer stays at the smallest scale of the pressure gauge in vacuumizing
and preserve the pressure for 1 hour. Then check that the pressure does not rise.
FusionModule500 Smart Mini Data Center
User Manual 4 Installation Guide
Issue 02 (2020-12-25) Copyright © Huawei Technologies Co., Ltd. 98
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