GMV5 D.C INVERTER MULTI VRF SERVICE MANUAL
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9.2 METHOD FOR PERFUSING REFRIGERANT
Refrigerant perfusion for the VRF system is classified into pre-perfusion and perfusion during
running.
9.2.1 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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