Preparing For Power-On - Huawei NetCol5000-A User Manual

NetCol5000-A 42 kW Air Cooled In-row Precision Air
Conditioner
User Manual
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Step 5 The amount of refrigerant precharged must be more than half of the total charge amount
calculated and less than the total charge amount. If refrigerant is not charged to the total
amount in the precharging process, charge the remaining amount of refrigerant during
power-on commissioning. For details about commissioning, see
Refrigerant.
Step 6 After refrigerant charging, close pressure gauge valves and the refrigerant steel vessel valve.
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4.2 Preparing for Power-On

Procedure
Step 1 Verify that the air conditioner switch in the upstream power distribution cabinet (PDC) is
OFF.
Step 2 Verify that the input voltage meets the requirement.
Ensure that there is no reverse or open phase for the input power cable of the air conditioner.
Otherwise, the air conditioner may be damaged beyond repair.
Step 3 Verify that the L1, L2, L3, N, and PE wires are connected to the indoor and outdoor units in
correct phase sequence.
Step 4 Verify that the signal cable between the indoor and outdoor units is properly connected.
Step 5 Verify that the water sensor is properly installed.
Issue 01 (2017-07-27)
Do not move the pipe or steel vessel when charging refrigerant. Otherwise, the value on
the electronic scale is influenced.
When charging refrigerant for a cooling system without a low-temperature component,
open only the low-pressure gauge valve. Charge 1 kg of refrigerant from the low pressure
side, and then close the low-pressure gauge valve. Then, open the high-pressure gauge
valve and charge the remaining refrigerant from the exhaust pipe needle valve.
When charging refrigerant for a cooling system with a low-temperature component, open
only the low-pressure valve of gauge 1 and gauge 2. Charge 1 kg of refrigerant from the
low pressure side, and then close the low-pressure valve of gauge 1. Then, open the
high-pressure valves of gauge 1 and gauge 2. Charge the remaining refrigerant from the
exhaust pipe needle valve and liquid pipe needle valve.
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.
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4 Commissioning
4.7 Charging the Remaining
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