Huawei FusionCol8000-E240 User Manual page 226

FusionCol8000-E240 Modular Indirect Evaporative
Cooling System
User Manual
Figure 8-33 Precharging refrigerant
(1) Refrigerant cylinder
(4) Connection nut
Step 2 Slightly open the refrigerant cylinder valve and slightly loosen the connection nut
of the pressure gauge and rubber hose. 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 provided by Huawei, put the refrigerant cylinder upside
down when charging the refrigerant. If the refrigerant is not provided by Huawei,
check with the refrigerant provider whether the cylinder has 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 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 liquid pipe
needle valve.
Do not move the hose or refrigerant cylinder when charging refrigerant.
Otherwise, the reading on the electronic balance will be affected.
Step 5 The amount of pre-charged 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 the total refrigerant amount cannot be fully pre-charged, charge the
remaining amount of refrigerant during power-on commissioning.
Step 6 After the refrigerant is charged, close all pressure gauge valves and the refrigerant
cylinder valve.
Issue 02 (2021-04-15)
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(2) Electronic balance
(5) Low pressure needle valve
8 System Maintenance
(3) Pressure gauge
(6) Liquid pipe needle valve
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