NetCol5000-A(025, 035) In-row Air Cooled Smart
Cooling Product
User Manual (600 mm)
Copyright © Huawei Technologies Co., Ltd.
Pa (absolute pressure). When the pressure stops dropping, pump for another 10 minutes. The
indication of sight glass is dry (green).
Step 5 Close all the pressure gauge valves, and the vacuum pump after vacuumizing the cooling
system. Preserve the pressure for 10 minutes without disconnecting the connection. The
pressure should be lower than and equal to 90 Pa (absolute pressure).
If the precision of the pressure gauge is too low to display 60 Pa (absolute pressure), ensure that the
pressure gauge pointer stayed at the minimum scale while vacuumizing the cooling system, preserve the
pressure for 1 hour, and check whether the displayed pressure increases obviously.
----End
5.2.4 Partially Charging Refrigerant
Prerequisites
Charge refrigerant (R410A) right after checking that the cooling system does not leak and
the vacuum level meets the requirements.
Calculate the refrigerant amount to be charged by referring to 5.2.1 Calculation about the
Charged the Refrigerant and Refrigerant Oil.
Before charging refrigerant, ensure that the air is exhausted from the hose connecting to
the refrigerant steel vessel.
Procedure
Step 1 Take off the vacuum pump from the vacuumizing equipment, and replace the vacuum pump
with a refrigerant steel vessel.
Step 2 Partially open the refrigerant steel vessel valve and rubber tube nut shown in Figure 5-3.
Tighten the nut when you feel cold air coming out from the nut.
Step 3 Put the refrigerant steel vessel upside down on an electric balance. Clear the reading on the
balance.
If the R410A refrigerant is provided by Huawei, put the refrigerant steel vessel upside down
when charging in the refrigerant. If the refrigerant is not provided by Huawei, check with the
refrigerant provider whether the steel vessel has a siphon. If the vessel has a siphon, put it
upside up when charging in refrigerant. If the vessel has no siphon, put it upside down when
charging in refrigerant. These measures ensure that the refrigerant is charged in the liquid
form.
Step 4 Open pressure gauge valves and the refrigerant steel vessel valve shown in Figure 5-3 to
charge refrigerant.
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