Huawei NetCol8000-A013 User Manual page 68

NetCol8000-A013 In-room Air Cooled Smart Cooling
Product
User Manual (800 mm Width)
Step 4 Check that the time for vacuumization is 80 minutes or longer after ensuring 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 the pump. Preserve the pressure for 10 minutes, and verify
that the pressure of the cooling system is not greater than 90 Pa (absolute
pressure).
Step 6 After ensuring that the pressure does not rise, open the stop valves for the gas
pipe and liquid pipe of the outdoor unit.
● After the outdoor unit stop valves are 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 pipes of the indoor unit. For
details, see steps 1 to 3 in section "Commissioning Components."
Step 7 Remove the rubber hose, pressure gauge, and vacuum pump.
Step 8 Install needle valve nuts and rear cover nuts for the outdoor and indoor units.
Step 9 Wrap thermal insulation foam around the gas pipe stop valve.
Figure 3-41 Wrapping thermal insulation foam for the gas pipe stop valve
(1) Thermal insulation
foam for stop valves
Issue 06 (2022-11-25)
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 vacuuming and
preserve the pressure for 1 hour. Then check that the pressure does not rise.
CA UTION
(2) Gas pipe stop valve (3) Liquid pipe stop
Copyright © Huawei Technologies Co., Ltd.
(4) Cable tie
valve
3 Installation
61