GMV5 DC INVERTER VRF UNITS SERVICE MANUAL
196
Note: Compressor lubricant must be kept completely airtight. Hitachi compressors use special
lubricant FVC68D whose moisture absorption capability is high. Requirements on air-tightness
of these compressors are higher.
2. Prepare other materials.
(1) Prepare nitrogen. Prepare enough nitrogen. They will be used during welding. Nitrogen pressure
should be 2.0 MPa at least.
(2) Prepare welding rods. In addition to ordinary welding rods, you should also prepare special welding
rods (containing 5% or more silver). Compressors‘ inlets and outlets are made of copper plated steels,
which require special welding rods and materials.
(3) Prepare gases for welding. Oxygen and acetylene of proper amount should be determined with
consideration of actual welding positions. Try to finish the welding task once. Avoid repeated welding.
(4) Prepare tools, including hexagon, diagonal pliers, combination pliers, needle nose pliers, multimeter,
pressure gauge, Phillips screwdriver, flathead screwdriver, wrenches (at least two), PVC insulation tape,
and tielines (multiple).
Step 8: Install a new gas/liquid separator.
Note: If a faulty compressor needs replacement, the gas/liquid separator needs replacement as
well. This is to avoid abnormality from happening inside the gas separator, and affecting system
safety and reliability.
Put the gas/liquid separator on a chassis and connect the inlet pipe of the gas separator with the outlet
pipe. Then, connect the pipe to a nitrogen source. The nitrogen source can be connected based on
actual situation, for example, you can add a bypass interface or directly connect the nitrogen source to
the inlet/outlet pipe. If the pipe is big, cover it with tape as well. Make sure nitrogen can smoothly flow
through the gas separator.
The sealing
rubbers for
various parts
must be intact
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