Verifying The Installation - Huawei NetCol5000-A050 Quick Manual

7

Verifying the Installation

Item Check Content
Ports are connected correctly. The pipes have oil traps, inverted U-
shaped traps, gradients (of refrigerant pipes), and pipe supports.
Refrigerant The pipes are secured. The pipes are wrapped with thermal
pipe insulation foam, and the foam is intact. The needle valve plugs are
secured (torque: 0.45 ± 0.05 N· m), and the valve bonnets are
tightened. Pipes are not over-bent.
Water pipe Water pipe joints are sealed. The drainpipe is properly connected.
Cables are intact and free of sharp bends. All cables are connected
Electrical
correctly and securely. The rated specifications of the upstream
connection
switch meet the maximum current requirement of the device.
The cabinet is installed properly without any tilt. The cabinet is
Indoor unit secured by bolts. The foreign matter inside the cabinet such as
cable ties and stubs is cleaned up. The holes are sealed.
The sheet metal fasteners on the compressor have been removed.
Compressor
The bolts for securing the compressor are tightened.
Fan blades work properly. The fin protective cardboards have been
removed. The needle valve bonnets are tightened. There is no
foreign matter in the electric control box. The door of the electric
Outdoor unit
control box is closed. The screws on the door are tightened. The
waterproof connectors at the bottom are tightened. The cables are
protected with tubes.
The installation space is proper, and the installation environment is
Environment
clean and tidy.
Leakage Test with Nitrogen, Vacuumization, and
8
Refrigerant Precharging
8.1
Leakage Test with Nitrogen
Inject 3.0 MPa nitrogen and preserve the pressure for 24 hours. The system pressure should not
decrease under a stable ambient temperature before and after the preservation. If any leakage
is found after pressure preservation, check the pipes for leakage, especially the welding points,
needle valves, and angle valves.
8.2
Vacuumization
Perform vacuumizing for at least 80 minutes and ensure that the final absolute pressure is not
greater than 60 Pa. When the final pressure does not decrease more, continue to vacuumize for
10 minutes. After vacuumizing is complete, close the vacuum pump and all valves, and preserve
the pressure for 10 minutes. Ensure that the absolute pressure does not exceed 90 Pa. If the
minimum reading of the pressure gauge is greater than 60 Pa, ensure that the pointer stays at
the smallest scale of the pressure gauge and preserve the pressure for 1 hour. Then check that
the pressure does not rise.
17
Check Result
□ Passed
□ Failed
□ Passed
□ Failed
□ Passed
□ Failed
□ Passed
□ Failed
□ Passed
□ Failed
□ Passed
□ Failed
□ Passed
□ Failed