Gree GMV-1015WM/G-U, Service Manual

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Gree GMV6 DC Inverter VRF Units Service Manual
273
The seal blocks
of all the parts
must be intact.
Make sure that the compressor's lubricant is sealed reliably. Hitachi compressors adopt the FVC68D
dedicated lubricant, which is highly hygroscopic. Therefore, the lubricant has a strict requirement on
lubricant sealing.
(2) Tools
1) Get nitrogen ready. Comply with the nitrogen charging and welding regulations during the
welding. Make sure that the nitrogen is sufficient. The suggested nitrogen pressure is above 2.0 MPa.
2) Get welding rods ready. In addition, special welding rods with the silver content of above 5%
are required to weld the compressor as the compressor air inlet and outlet adopt copper-coated steel
pipes, which require special welding rods and welding flux.
3) Get welding tools ready. Assess the nitrogen and acetylene quantity necessary for the
welding according to the part to be welded. Prevent repeated welding of the same places.
4) Get all the auxiliary service tools ready, including hex key, diagonal pliers, pincer pliers,
needle-nosed pliers, multimeter, pressure gauge, Phillips screwdriver, slotted screwdriver, at least
two wrenches, insulating tape, and cable ties.
Step 2: Power-off
If the replacement of the compressor is necessary according to the above-mentioned conditions,
switch off the power of the ODU, disconnect the power cable, disconnect the ODU from the power and
wrap the power cables with insulating tapes, and put a warning sign at the power switch to prevent electric
shocks.
Step 3: Removing electric parts
Mark the compressor cables, temperature sensors and auxiliary electric heater properly while
removing them so that the parts can be rewired correctly later.
Step 4: Checking lubricant quality