Huawei NetCol5000-A050 Quick Manual page 21

11.3 Precharging Refrigerant
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, put it upside up when
charging in refrigerant. If the vessel has no siphon, put it upside down when charging in
refrigerant. These measures ensure that the refrigerant is charged in the liquid form.
1. Remove the vacuum pump from the vacuuming equipment, and replace the vacuum
pump with a refrigerant steel vessel.
2. Partially open the refrigerant steel vessel valve and rubber tube nut. Tighten the nut when
you feel cold air coming out from the nut.
3. Put the refrigerant steel vessel upside down on an electric balance. Clear the reading on
the balance.
4. Open pressure gauge valves, and the refrigerant steel vessel valve to charge refrigerant.
5. The amount of refrigerant charged must be more than half of the total charge amount
calculated and less than the total charge amount. Charge the remaining refrigerant during
power-on commissioning.
6. After refrigerant charging, close pressure gauge valves, and the refrigerant steel vessel
valve.
Amount of refrigerant to be charged for the NetCol5000-A
When the outdoor unit is NetCol500-A120, the outdoor unit can be separately connected to two
indoor units.
21