Gree GMV-VQ280WM/C-X Owner's Manual page 44

refrigerant added to this module is 0kg.
So, ∑Refrigerant charging amount B of every module= 0kg.
Suppose the Pipeline charging amount A=∑Liquid pipe length×refrigerant charging amount of
every 1m liquid pipe = 5kg.
Total refrigerant charging amount R = 5+0=5kg.
Modular combination of outdoor unit subjects to combinations that is currently available.
3.7.2 Refrigerant-charging Method
Refrigerant charging for multi VRF unit includes two parts: pre-charging and start-up charging，
For heat recovery units, prepare two vacuum pumps and two sets of pressure gauges before
evacuation. .
(1) Pre-charging of refrigerant.
Step 1: Connect the high pressure gauge pipe of pressure gauge 1 to the detection opening of
the high pressure gas valve, the low pressure gauge pipe to the detection opening of the low
pressure gas valve, and the medium gauge pipe to vacuum pump 1; then connect the high pressure
gauge pipe of pressure gauge 2 to the detection opening of the liquid valve, close the low pressure
gauge pipe, and connect the medium gauge pipe to vacuum pump 2.
Put through the power for the vacuum pump to conduct the vacuum drying work.
Step 2: Once vacuum drying is completed, close the high and low pressure gauge pipes of
pressure gauge 1 as well as the high pressure gauge pipe of pressure gauge 2. Disconnect the
medium pressure gauge pipes of the two pressure gauges from the vacuum pumps.
Disassemble the double 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.
GMV Heat Recovery DC Inverter VRF
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