Gree GMV-VQ680WM/C-X Service Manual page 335

Gree
WARNING!
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.
GMV6 HR DC Inverter VRF Units Service Manual
333