Step 3 To add refrigerant, perform the following steps:
1. Close the high-pressure valve and low-pressure valve of the pressure gauge.
2. Take o the vacuum pump and install the liquid refrigerant cylinder.
3. 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.
4. Put the refrigerant cylinder upside down on the electronic balance. Clear the
reading on the balance.
5. Start the compressor and let it run for 10 minutes.
6. Open the low-pressure gauge valve and refrigerant cylinder valve at the joint
of the gas pipe needle valve, and then charge refrigerant at the gas pipe
needle valve.
Do not move the hose or refrigerant cylinder when charging refrigerant.
Otherwise, the reading on the electronic balance will be aected.
7. Charge liquid refrigerant.
8. After the refrigerant is charged, close all pressure gauge valves and the
refrigerant cylinder valve.
9. Remove the refrigerant charging device and install the needle valve nut.
Tighten the needle valve nut when the charge is complete. Check whether a needle
valve leaks by applying soapy water to the valve vent or using a halogen leak detector.
If it leaks, contact Huawei technical support.
Figure 5-3 Charging refrigerant
(1) Refrigerant cylinder
(2) Electronic balance (3) Pressure gauge
(4) Connection nut (5) Gas pipe needle valve (6) Liquid pipe needle valve
----End
FusionModule500 Smart Mini Data Center
User Manual 5 Power-On Commissioning
Issue 01 (2020-11-30) Copyright © Huawei Technologies Co., Ltd. 116
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