Trane 4TVH0086FE000AA Service Manual page 105

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 V6 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
104
This oil is still
transparent but there
are impurities which
may clog the filter
This oil contains
particles of copper