Huawei NetCol8000-E220 User Manual page 64

NetCol8000-E220 Modular Indirect Evaporative
Cooling System
User Manual
Prerequisites
Before charging refrigerant, ensure that air is exhausted from the gas pipe
connecting to the refrigerant cylinder.
Context
● The NetCol8000 is a dual system, and charging refrigerant should be carried
out one by one or simultaneously. The following figure uses one system as an
example.
● Charge 2 kg refrigerant R410A for each system.
● When charging refrigerant, you are advised to use a safety valve to prevent
refrigerant leakage during the removal of the leather hose, which may cause
frostbite.
● Wear antifreeze gloves when performing refrigerant-related operations.
● Charge refrigerant (R410A) right after checking that the cooling system does
not leak and the vacuum level meets the requirements.
Procedure
Step 1 Remove the vacuum pump from the vacuumizing equipment, and replace the
vacuum pump with a refrigerant cylinder, as shown in
Figure 3-31 Precharging refrigerant
(1) Refrigerant cylinder
(4) Connection nut
Step 2 Slightly open the refrigerant cylinder valve and loosen the connection nut of the
pressure gauge. Tighten the nut when cold air escapes out of the nut.
Issue 06 (2020-08-19)
CA UTION
(2) Electronic scale
(5) Liquid pipe needle valve
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3 Installation Guide
Figure 3-31.
(3) Pressure gauge
(6) Low-pressure needle valve
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