GREE Photovoltaic Direct-driven Inverter Multi VRF Units
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10.2 Method for Perfusing Refrigerant
Refrigerant perfusion for the VRF system is classified into pre-perfusion and perfusion during
running.
10.2.1 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.
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