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FusionCol8000-E400 Modular Indirect Evaporative
Cooling System
User Manual
Figure 9-14 Vacuumizing
(1) Vacuum pump
(3) Discharge 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 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
dropping, vacuumize for another 10 minutes, after which the sight glass should
display green, a sign of dryness.
Step 5 After vacuumizing is complete, close all valves of the pressure gauge and the
vacuum pump without disconnecting the pump, and preserve the pressure for 10
minutes. Ensure that the pressure of the cooling system does not exceed 90 Pa
(absolute pressure).
----End
9.6.5.3 Precharging Refrigerant
Prerequisites
Before charging refrigerant, ensure that air is exhausted from the pipe connected
to the refrigerant cylinder.
Issue 04 (2022-06-30)
NO TE
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 evidently.
Copyright © Huawei Technologies Co., Ltd.
(2) Pressure gauge
(4) Low-pressure needle valve
9 Parts Replacement
139
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