Gree GMV5 Series, Руководство по обслуживанию, Страница: 270 / 321

GREE Photovoltaic Direct-driven Inverter Multi VRF Units
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Check the rubbers for oil separator, gas separator, oil balancer and drying filter. If they are lost
during transportation, cover the parts with tape to kep the compressor dry and airtight inside.
Caution!
Compressor lubricant must be kept completely airtight. Hitachi compressors use special lubricant
FVC68D whose moisture absorption capability is very high. Therefore the requirements on air-tightness
of these compressors are much higher.
(2) Prepare relative tools
1) Prepare nitrogen. Please strictly follow the rules for nitrogen charging during the welding process.
Prepare enough nitrogen. Nitrogen pressure should be above 2.0MPa.
2) Prepare welding rods. In addition to preparing ordinary welding rods, you should also prepare
special welding rods that contain 5% or more silver for welding compressors. The gas inlet and outlet of
compressor are made of copper plated steels, which require special welding rods and solder.
3) Prepare appropriate tools for welding. The amount of oxygen and acetylene should be
determined with consideration of actual welding positions. Try to finish welding task by once. Avoid
repeated welding.
4) Prepare all basic maintenance tools, including hexagon, diagnonal pliers, combination pliers,
needle nose pliers, multimeter, pressure gauge, Phillipshead screwdriver, flathead screwdriver, at least