Precharging Refrigerant - Huawei NetCol5000-A050 User Manual

NetCol5000-A050 In-row Air Cooled Smart Cooling
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alternatively for several times. The position of the pressure gauge pointer and the
sound made by the vacuum pump do not obviously 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).
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6.1.3 Precharging Refrigerant

Prerequisites
Before charging refrigerant, ensure that air is exhausted from the gas pipe
connecting to the refrigerant cylinder.
Context
● When charging refrigerant, you are advised to use a safety valve to prevent
refrigerant leakage during the removal of a rubber 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
Issue 13 (2023-08-20)
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
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6 Power-On Commissioning
Figure 6-3 or Figure 6-4.
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