Gree GMV6 DC Inverter VRF Units Service Manual
185
3 Refrigerant Charging Method
Refrigerant charging for multi VRF unit includes two parts: pre-charging and start-up charging.
3.1 Pre-charging of refrigerant.
Step 1:
Connect the pipe of high pressure gauge of the pressure gauge to the detection port of liquid
pipe, the pipe of low pressure gauge to the detection port of gas pipe valve, and the pipe of intermediate
pressure gauge to the vacuum pump. Put through the power for the vacuum pump to conduct the vacuum
drying work.
Step 2:
Once vacuum drying is completed, close the high pressure gauge valve and the low pressure
gauge valve. Disassemble the intermediate gauge pipe and the vacuum pump connection end, and then
connect the refrigerant tank.
Step 3:
Properly loosen the pipe of intermediate gauge and the connection end of pressure gauge,
slightly open the refrigerant tank valve, and empty the pipe of intermediate gauge. After that, retighten
the joint and open the refrigerant tank valve.
Step 4:
If the refrigerant tank itself does not have a siphon, then the refrigerant tank needs to be
inverted and placed on the electronic scale to record the current weight of m1; if the refrigerant tank itself
has a siphon, the refrigerant tank should be kept in an upright state, and record the current weight of m1.
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