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a. Close the high-pressure valve and low-pressure valve of the pressure gauge.
b. Take off the vacuum pump from the vacuumizing equipment, and replace the vacuum
pump with a refrigerant cylinder.
c. Slightly open the refrigerant cylinder valve and slightly loosen the connection nut on the
leather hose. Tighten the nut when cold air escapes out of the nut.
d. Put the refrigerant cylinder upside down on an electric balance. Set the reading on the
balance to zero.
e. Start the compressor and let it run for 10 minutes.
f. Open the low-pressure valve and refrigerant steel cylinder valve at the joint of the gas
pipe needle valve, and then charge refrigerant at the gas pipe needle valve.
g. Charge liquid refrigerant.
h. After the refrigerant is charged, close all pressure gauge valves and the refrigerant
cylinder valve.
i. Remove the refrigerant charging device and install the bonnet.
If the R410A refrigerant is provided by Huawei, put the refrigerant cylinder upside down when
charging in 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 in refrigerant. If the cylinder has no siphon, put the cylinder upside down when charging
in refrigerant. These measures ensure that the refrigerant is charged in the liquid state.
On the Diagnostic Mode Parameters page, set Comp manual control to 3000 rpm.
Choose Running Info > Compressor Information and view the Suction pressure and
Discharge pressure to determine whether they are within normal ranges. The normal suction
pressure range is 0.7–1.6 MPa, and the ratio (air discharge pressure/air suction pressure) > 1.4.
The normal discharge pressure range is listed in the following table. Check the EEV suction
overheating degree (normal range: 4–15°C) on the Running Info > Electronic Expansion
Valve Information page.
Outdoor Ambient Temperature
Below 15°C
15–35°C
35–45°C
Above 45°C
Proper Discharge Pressure Range
24
1.5–2.5 MPa
1.5–3.1 MPa
2.5–3.8 MPa
3.1–4.0 MPa
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