Huawei NetCol8000-A013 User Manual page 71

NetCol8000-A013 In-room Air Cooled Smart Cooling
Product
User Manual (600 mm Width)
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Context
Tools: pressure gauge (measuring range ≥ 4.0 MPa), leather hose (withstanding a
pressure of at least 4.5 MPa), vacuum pump.
Procedure
Step 1 Connect the pressure gauge and vacuum pump and check that the pressure gauge
valves are all open.
Figure 3-39 Vacuumization
(1) Vacuum pump
Step 2 In the beginning, the vacuum pump makes loud noises and exhausts white smoke
from the exhaust vent. After 10 minutes, if it still exhausts white smoke, observe it
for another 10 minutes because the cooling system may not be sealed properly or
there may be too much water in the cooling system.
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 Check that the time for vacuuming is 80 minutes or longer after making sure that
the cooling system does not leak, and that the pressure displayed on the vacuum
pump is less than or equal to 60 Pa (absolute pressure). When the pressure stops
dropping, pump for another 10 minutes.
Step 5 After vacuumization, close all valves of the pressure gauge and the vacuum pump
without disconnecting it. Preserve the pressure for 10 minutes, and verify that the
absolute pressure of the cooling system is not greater than 90 Pa.
Issue 04 (2022-11-25)
Ensure that stop valves for the gas pipe and liquid pipe of the indoor unit are
open.
Verify that stop valves for the gas pipe and liquid pipe of the outdoor unit are
closed.
(2) Pressure gauge
Copyright © Huawei Digital Power Technologies Co., Ltd.
3 System Installation
(3) Needle valve of gas (4) Needle valve of
pipe stop valve liquid pipe stop valve
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