D-EIMWC00804-14EN
Centrifugal Chillers
55
sample the lubricating oil shortly after a unit has been placed back into operation after it
has been opened for service, as recommended from previous sample results or after a
failure. The presence of residual materials from a failure should be taken into
consideration in subsequent analysis. While the unit is in operation, the sample should
be taken from a stream of refrigerant oil, not in a low spot / quiet area.
Table 15, Upper Limit For Wear Metals And Moisture In Polyolester Oils In
Daikin Centrifugal Chillers
Elements
Upper Limit (ppm)
Action
Aluminum
50
1
Copper
100
1
Iron
100
1
Moisture
150
2 &3
Silica
50
1
Total Acid Number (TAN)
.19
3
Key To Action
1.
Re-sample after 500 hours of unit operation. If content increases less than 10%,
change oil and filter and re-sample at normal interval. If content increases 25%
or more, inspect compressor.
2.
Re-sample after 500 hours of unit operation. If content increases less than 10%,
change filter drier and re-sample at normal interval. If content increases 25% or
more, monitor for water leak. Since POE lubricants are hygroscopic, many times
the high moisture level is due to inadequate handling and packaging. The
TAN
reading
MUST BE USED
in conjunction with moisture readings
3.
For TAN between .10 and .19, re-sample after 1000 hours of unit operation. If
TAN increases above .19, change oil, oil filter and filter drier and re-sample at
normal interval.
