Connecting Cables; Precautions - Huawei NetCol8000-E220 User Manual

NetCol8000-E220 Modular Indirect Evaporative Cooling
System
User Manual
(4) Connection nut
Step 2 Slightly open the refrigerant cylinder valve and loosen the connection nut of the pressure
gauge. Tighten the nut when cold air escapes out of the nut.
Step 3 Put the refrigerant cylinder upside down on the electronic scale. Clear the reading on the
balance.
If the R410A refrigerant is provided by Huawei, put the refrigerant steel vessel upside down
when charging in the refrigerant. If the refrigerant is not provided by Huawei, check with the
refrigerant provider whether the steel vessel has a siphon. If the vessel has a siphon, do not
put it upside down when charging refrigerant. If the vessel has no siphon, put it upside down
when charging refrigerant. These measures ensure that the refrigerant is charged in the liquid
form.
Step 4 Open the pressure gauge valves and refrigerant cylinder valve shown in
refrigerant.
Do not move the pipe or steel vessel when charging refrigerant. Otherwise, the value on the
electronic scale is influenced.
Step 5 The amount of refrigerant precharged is 4 kg to 8 kg for each system. If refrigerant is not
charged to the total amount in the precharging process, charge the remaining amount of
refrigerant during power-on commissioning.
Step 6 After refrigerant charging, close pressure gauge valves and the refrigerant steel vessel valve.
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3.12 Connecting Cables

3.12.1 Precautions


Issue 02 (2019-10-10)
After the injection is completed, tighten the needle valve bonnet, and check whether the needle valve
leaks by applying soap bubbles to the valve vent or using a halogen leak detector. If the valve leaks,
contact Huawei technical support.
All power cables and ground cables comply with local country standards. Check the
operating current of the NetCol8000 according to the NetCol8000 nameplate or the
electrical diagram provided with the NetCol8000. Determine that the cables and circuit
breakers are sufficient to handle the case in which loads are affected after the
NetCol8000 stops generate cooling for the loads.
Copyright © Huawei Technologies Co., Ltd.
(5) Liquid pipe needle valve
3 Installation Guide
(6) Low-pressure needle valve
Figure 3-31 to charge
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