Gree Ultra Heat GMV-V72W/A-F, Service Manual, Page: 140 / 240

Ultra Heat GMV VRF Technical Service Manual MAINTENANCE
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For other pipeline parts, clear them based on actual situation. If you do not replace the parts
immediately, make sure to block the pipes with tapes, preventing air moistures and impurities from
contaminating them.
Step 7: Preparations.
(1) Prepare new parts.
In the course of moving compressors, do not lay them down or put them upside down. The tilt
angle should be less than 30°. Make sure oil will not overflow from the oil balance opening. The inlet
and outlet should be blocked. If the sealing rubber is not available, cover them with tape to prevent
direct contact of oil and air.
Note: The new compressor must be consistent with the faulty one in model.
Check the rubbers for oil separator, gas separator, and drying filter. If they are lost during
transportation, cover the parts with tape to keep the compressor dry and airtight inside.
Note: Compressor lubricant must be kept completely airtight. GREE compressors use special
lubricant FV50S whose moisture absorption capability is high. Requirements on air-tightness of these
compressors are higher.
(2) Prepare other materials.
1) 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