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FusionCol8000-E240 Modular Indirect Evaporative
Cooling System
User Manual
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
12.15.4.3 Precharging Refrigerant
Prerequisites
Before charging refrigerant, ensure that air is exhausted from the pipe connected
to the refrigerant cylinder.
Context
● When charging refrigerant, you are advised to use a safety valve to prevent
refrigerant leakage during the removal of the rubber hose, which may cause
frostbite.
● Wear antifreeze gloves when performing refrigerant related operations.
● Fill the refrigerant (R410A) after checking that the cooling system does not
leak and the vacuum level meets the requirements.
Procedure
Step 1 Take off the vacuum pump from the vacuumizing device, and replace the vacuum
pump with a refrigerant cylinder.
Issue 03 (2021-04-20)
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.
CA UTION
Copyright © Huawei Digital Power Technologies Co., Ltd.
12 Component Replacement
184
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