Vacuumization - Huawei NetCol8000-A013 User Manual

NetCol8000-A013 In-room Air Cooled Smart Cooling
Product
User Manual (800 mm Width)

3.13 Vacuumization

Prerequisites
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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 3-41 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.
Issue 05 (2019-12-20)
Check that all pipe connectors are correct, and the refrigerant pipe tilts and has supports.
All pipes have been checked for leaks, and all pipes are not bent by a large angle.
Check that the hose clamps and cable ties of the drainpipe are secured. Water pipe joints
have been sealed by sealant.
Check that all nitrogen has been exhausted from the indoor unit.
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
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(3) Needle valve of gas
pipe stop valve
3 Installation Guide
(4) Needle valve of liquid
pipe stop valve
59