Huawei NetCol8000-A013 User Manual page 67

NetCol8000-A013 In-room Air Cooled Smart Cooling
Product
User Manual (800 mm Width)
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.
If the pressure gauge cannot display 60 Pa (absolute pressure), perform vacuum pumping so that the
pressure gauge stays at the smallest scale and preserve the pressure for 1 hour. Then, check whether the
pressure displayed on the gauge has an obvious increase.
Step 6 After making sure that the pressure gauge has no obvious increase, open the stop valves for
the gas pipe and liquid pipe of the outdoor unit.

After the outdoor unit stop valve is opened, the refrigerant in the outdoor unit flows to the
engineering pipe and indoor unit pipe. When performing other operations, be careful to
prevent refrigerant from spraying out.

After the vacuumization and before removing the rubber hose, ensure that there is positive
pressure inside the refrigerant pipe of the indoor unit. For detailed operations, see step 1–3
in section "Commissioning Components".
Step 7 Remove the hose, pressure gauge, and vacuum pump.
Step 8 Install needle valve nut and rear cover nut of indoor unit and outdoor unit.
Step 9 Wrap the gas pipe stop valve with stop valve sponge.
Figure 3-42 Wrapping the gas pipe stop valve
(1) Stop valve
sponge
Issue 05 (2019-12-20)
(2) Gas pipe stop
valve
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3 Installation Guide
(3) Liquid pipe stop
valve
(4) Cable
ties
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