Method For Perfusing Refrigerant - Gree GMV5 Series Service Manual

(X4.0)-M. The quantity of perfused refrigerant for this module is 0 kg.
Therefore,
∑ Quantity of refrigerant perfused for each module (B) = 0 kg
Assume that the quantity of refrigerant perfused for the pipe (A) = ∑ Length of the liquid pipe x Quantity
of refrigerant perfused for the liquid pipe per meter = 5kg
Total quantity of refrigerant perfused for the system (R) = 5+0= 5 kg
II. Method for Perfusing Refrigerant
Refrigerant perfusion for the VRF system is classified into pre-perfusion and perfusion during running.
1. Refrigerant Pre-perfusion
Step 1: Connect the high pressure gauge pipe to the detection opening of the liquid pipe, the low
pressure gauge pipe to the detection opening of the gas pipe, and the medium gauge pipe to the
vacuum pump. Power on the vacuum pump to perform vacuumization and desiccation.
Step 2: After vacuumization and desiccation are finished, turn off valves of the high pressure gauge and
low pressure gauge. Disconnect the medium gauge pipe from the vacuum pump and connect it
to the refrigerant tank.
Step 3: Properly loosen the joint between the medium gauge pipe and the pressure gauge and slightly
turn on the valve of the refrigerant tank. Vacuumize the medium gauge pipe. After that, fasten
the joint and turn on the valve of the refrigerant tank completely.
Step 4: If the refrigerant tank is not equipped with a siphon, reverse the refrigerant tank and place it on
the electronic scale. Then record the current weight (m1). If the refrigerant tank is equipped with
a siphon, record the current weight (m1) directly.
Step 5: Turn on the valve of the high pressure gauge (while keep the valve of the high pressure gauge
turned off) and then perfuse refrigerant to the system. Record the change of weight of the
refrigerant tank.
Step 6: When all refrigerant in the refrigerant tank is perfused, record the current weight m2.
Step 7: Turn off the valve of the high pressure gauge and replace the refrigerant tank.
Step 8: Perform step 3 again.
Step 9: Perform step 5 and step 6 again. Record the weight before perfusion m3 and weight after
perfusion m4.
Step 10:If there is no sufficient refrigerant and the calculated quantity of refrigerant is not fulfilled for the
system, record the current total perfusion quantity.
GMV5 DC INVERTER VRF UNITS SERVICE MANUAL
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