Gree Ultra Heat GMV-V72W/A-F, Service Manual

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Ultra Heat GMV VRF Technical Service Manual INSTALLATION
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Refrigerant amount must be calculated and treated by strictly following the above methods. Otherwise,
system will not work normally and compressor may even be damaged.
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Rated capacity configuration ratio C of outdoor/indoor unit = Rated Cooling capacity sum of indoor
units/Rated Cooling capacity sum of outdoor units
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If all the indoor units are GMV-NDX series fresh air indoor units, the added refrigerant quantity B for
every module is 0 kg (bound).
2 METHOD FOR PERFUSING REFRIGERANT
Refrigerant perfusion for the VRF system is classified into pre-perfusion and perfusion during
running.
2.1 Refrigerant Pre-perfusion
Step 1: Connect the high pressure gauge pipe to the detection opening of the liquid 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.