Huawei NetCol8000-E220 Series Quick Manual page 19

4. Open pressure gauge valves, and the refrigerant steel vessel valve to charge refrigerant (the
amount of refrigerant precharged is not less than 4 kg for each system, and the total amount of
refrigerant charged is 8 kg for each system).
5. After refrigerant charging, close pressure gauge valves, and the refrigerant steel vessel valve.
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.
Vacuum pump
Refrigerant
cylinder
Electronic scale
10
Power-On
10.1
Power-On
•
Users are classified into admin and operator. The preset password is 000001 for both types of
users.
•
After powering on, the smart cooling product is in shutdown mode.
•
After powering on, the compressor starts preheating, and the system generates an alarm
indicating that the compressor is preheating (for 12 hours). Do not start the smart cooling product
before the preheating ends. Choose Running > Device Details > Compressor to query the
remaining preheating time.
Liquid pipe
needle valve
Pressure
gauge
Nut
Nitrogen cylinder
1. Leak checking
2. Vacuuming
3. Precharging refrigerant
19
Low-
pressure
needle
valve