Vacuumization - Huawei NetCol8000-A013 User Manual

NetCol8000-A013 In-room Air Cooled Smart Cooling
Product
User Manual (600 mm Width)
Step 2 Connect the pressure gauge, leather hose, and nitrogen cylinder. A reducing valve
must be installed on the head of the nitrogen cylinder, as shown in
The outlet pressure of the reducing valve must not exceed 3.0 MPa.
If the outlet pressure of the reducing valve is greater than 3.0 MPa, components
may be damaged.
Figure 3-38 Leakage test with nitrogen
(1) Nitrogen cylinder
(4) Needle valve of gas pipe
stop valve
Step 3 Inject 3.0 MPa nitrogen and preserve the pressure for 24 hours. The system
pressure should stay constant under unchanging ambient temperature conditions.
If there is considerable temperature change and the pressure changes, perform the
test again.
Step 4 If welding defects exist, locate and repair the leak point. If the pressure does not
change, exhaust the nitrogen through the injection needle valves.
----End

3.13 Vacuumization

Prerequisites
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Issue 04 (2022-11-25)
NO TICE
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.
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(2) Reducing valve
(5) Needle valve of liquid pipe
stop valve
3 System Installation
Figure 3-38.
(3) Pressure gauge
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