Huawei NetCol5000-A050 Quick Manual page 23

10
Post-Installation Check
Item Content
Ports are connected properly. The pipeline has oil traps, inverted U-shaped
traps, gradients (for the refrigerant pipes) , and pipe supports. Pipes are
Refrigerant
securely connected. All pipes are wrapped with thermal insulation foam,
pipe
and the insulation foam is intact. The needle valve plug is secured (torque
of 0.45 ± 0.05 N•m) , and valve bonnet is tightened. The pipes have no
sharp bends.
Waterway Water pipe joints have been sealed. The drainpipe is securely connected.
Cables are not damaged or over-bent. The power cables and outdoor unit
(water-cooled module) , The signal cables and outdoor unit (including
smart cooling product monitoring board) or water-cooled module, water
Electricity sensor, the teamwork cable, and the T/H sensor cable are connected as
required. The rated specifications of the upstream switch meet the
maximum current requirement. All cable connectors are secured. Indoor
and outdoor units are properly grounded.
The cabinet is installed properly, without any tilt. The cabinet should be
secured. The foreign matter inside the cabinet such as cable ties and cable
Cabinet
cuts is cleaned up.
The transport fasteners of the compressor are removed. The bolts on the
Compressor
compressor are tightened.
The fan blades do not interfere and protective cardboards for fins are
removed. Bonnets of needle valves and water-proof connectors are
Outdoor
tightened. Cables are protected by tubes and the cable outlet faces
unit
downward. Glue is applied to the waterproof connector when the outdoor
unit is placed vertically and the waterproof connector faces upward.
Water valve
The actuator manual button is reset (ejected state) .
actuator
11
Leak Checking, Vacuuming, and Precharging Refrigerant
11.1 Leak Checking
Charge 3.0 MPa nitrogen and preserve the system for 24 hours. If the ambient
temperatures before and after the preservation are similar, the system pressure should
not drop. If leaks occur after the preservation, check them along the pipe, especially at
the welding positions, needle valve, and angle valve.
11.2 Vacuuming
The vacuuming time should be 80 minutes at least and the final pressure (absolute pressure)
should be 60 Pa at most. When the pressure stops dropping, pump for another 10 minutes.
After the vacuumization, close all the vacuum pump and valves. Preserve the system for
another 10 minutes and the pressure (absolute pressure) should be 90 Pa at most. If the
pressure gauge cannot be precise at 60 Pa, ensure that the pressure is displayed at the
minimum scale. Extend the preservation time to one hour. Then check whether the pressure
displayed on the pressure gauge increases.
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Result
□ Passed
□ Failed
□ Passed
□ Failed
□ Passed
□ Failed
□ Passed
□ Failed
□ Passed
□ Failed
□ Passed
□ Failed
□ Passed
□ Failed