Huawei NetCol5000-A050 User Manual page 117

NetCol5000-A050 In-row Air Cooled Smart Cooling
Product
User Manual (1350 mm Depth)
(7) Discharge pipe needle
valve
Step 2 Slightly open the refrigerant cylinder valve and slightly 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 balance. Clear the
reading on the balance.
If the R410A refrigerant is configured, put the refrigerant cylinder upside down
when charging refrigerant. If you purchase the R410A refrigerant by yourself,
confirm with the agent whether the cylinder is equipped with a siphon. If the
cylinder has a siphon, stand the cylinder when charging refrigerant. If the cylinder
has no siphon, put the cylinder upside down when charging refrigerant. These
measures ensure that the refrigerant is charged in the liquid state.
Step 4 Open all pressure gauge valves and the refrigerant cylinder valve to charge
refrigerant.
● Do not move the hose or refrigerant cylinder when charging refrigerant.
Otherwise, the reading on the electronic balance will be affected.
● 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 discharge 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 discharge pipe needle valve and
liquid pipe needle valve.
Step 5 The amount of precharged refrigerant must be greater than or equal to half of the
total charge amount calculated and less than or equal to the total charge amount.
If total refrigerant amount cannot be fully precharged, charge the remaining
refrigerant during power-on commissioning.
Step 6 After the refrigerant is charged, close all pressure gauge valves and the refrigerant
cylinder valve.
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Issue 04 (2022-12-15)
NO TICE
NO TICE
NO TE
Tighten the needle valve bonnets when the charge is complete. Check whether a needle
valve leaks by applying soap bubbles to the valve vent or using a halogen leak detector. If
any leakage occurs, contact technical support.
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(8) Liquid pipe needle valve
6 Power-On Commissioning
107