Vacuum Drying And Refrigerant Charging; Inspecting Compressor Oil - Midea VRF Series Service Manual

Step 8: Vacuum drying and refrigerant charging
 Once all the compressors and other components have been fully connected, vacuum dry the system and recharge
refrigerant. Refer to the V6R Engineering Data Book, Part 3.
Figure 6-2.10: Inspecting compressor oil
This oil is black
- it has been
carbonized
Cloudy or gray
oil indicates
abnormal
system
operation
This oil is a little
yellow, but is clear
and transparent and
the condition is
acceptable
V6R VRF 50/60Hz
This oil is still
transparent but there
are impurities which
may clog the filter
This oil contains
particles of copper
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