Precharging Refrigerant - Huawei NetCol8000-E220 User Manual

NetCol8000-E220 Modular Indirect Evaporative
Cooling System
User Manual
----End

10.4.2.3 Precharging Refrigerant

Prerequisites
Before charging refrigerant, ensure that air is exhausted from the pipe connected
to the refrigerant cylinder.
Context
● The NetCol8000-E220 has dual compressor systems. Charge refrigerant for the
systems one by one or at the same time. The following figure uses one system
as an example.
● 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.
● Charge the refrigerant (R410A) immediately 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 vacuumed device, and replace the vacuum
pump with a refrigerant cylinder.
Issue 10 (2024-01-30)
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.
CA UTION
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