Huawei NetCol5000-A, User Manual

Page: 126 / 269

NetCol5000-A 42 kW Air Cooled In-row Precision Air
Conditioner
User Manual
4 Commissioning
Issue 01 (2017-07-27) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
118
4.7 Charging the Remaining Refrigerant
Prerequisites

Check that the outdoor unit switch is turned on before you start the compressor.

Remove the refrigerant steel vessel after checking that no more refrigerant is required.

Charge refrigerant in an amount exactly as required by 4.1.1 Refrigerant Charge Amount .
Otherwise, the devices may be damaged.
Procedure
Step 1
Charge refrigerant on the basis of the precharging.

If there are no low-temperature components, open the low-pressure valve of the pressure
gauge, and charge the remaining refrigerant from the low-pressure needle valve in small
flow or intermittently, as shown in
Figure 4-3 .

If there are low-temperature components, open the low-pressure valves of pressure gauge
1 and pressure gauge 2, and charge the remaining refrigerant from the low-pressure
needle valves in small flow or intermittently, as shown in
Figure 4-4 .
Step 2
On the home screen, choose Running > Device Details > Compressor , and view Suction
pressure and Discharge pressure to determine whether they are within normal ranges. The
normal suction pressure range is 0.7–1.2 MPa. Table 4-12 lists the proper discharge pressure
range. Choose Running > Device Details > EEV , and view the EEV suction overheating
degree . The normal overheating degree should be in the range of 8–15°C.
Table 4-12 Normal discharge pressure ranges
Ambient Temperature Discharge Pressure Range
< 15°C 1.5–2.5 MPa
15–35°C 1.5–3.1 MPa
35–45°C 2.5–3.8 MPa
> 45°C 3.1–4.15 MPa
Step 3
After charging refrigerant, close all valves.
----End
4.8 Startup wizard
Prerequisites
Check that refrigerant is fully charged before performing the wizard startup.