D-EIMWC00804-14EN
Centrifugal Chillers
47
Table 14 gives the upper limits for metals and moisture in the polyolester lubricants required by
Daikin chillers.
Table 14, Metal and Moisture Limits
Element
Upper Limit (PPM)
Action
Aluminum
50
1
Copper
100
1
Iron
100
1
Moisture
150
2 & 3
Silica
50
1
Total Acid Number (TAN)
0.19
3
Key to Action
1)
Re-sample after 500 hours of unit operation.
a)
If content increases less than 10%, change oil and oil filter and re-sample at
normal interval (usually annual).
b)
If content increases between 11% and 24%, change oil and oil filter and re-
sample after an additional 500 hours of operation.
c)
If content increases more than 25%, inspect compressor for cause.
2)
Re-sample after 500 hours of unit operation.
a)
If content increases less than 10%, change filter-drier and re-sample at normal
interval (usually annual).
b)
If content increases between 11% and 24%, change filter-drier and re-sample
after an additional 500 hours of operation.
c)
If content increases more than 25%, monitor for a water leak.
3)
If TAN is less than 0.10, system is safe as far as acid is concerned.
a)
For TAN between 0.10 and 0.19, re-sample after 1000 hours of operation.
b)
For TAN above 0.19, change oil, oil filter, and filter-drier and resample at
normal interval
Changing Oil Filters
Daikin chillers are at positive pressure at all times and do not leak contaminated moist air into
the refrigerant circuit, thereby eliminating the need for annual oil changes. An annual laboratory
oil check is recommended to check overall compressor condition.
CE 050 Compressors - If the unit is equipped with a suction line service valve (dual
compressor units are so equipped as standard), close this valve and close the valve on the motor
cooling liquid line to isolate the compressor. Remove the refrigerant from the compressor using
approved procedures. Remove the filter cover and the old filter and install the new filter, open
end first. Replace the cover using a new gasket. Reopen the suction and liquid line valves.
If the unit is not equipped with a suction line service valve, the unit will have to be pumped
down in order to remove the pressure in the compressor before removing the cover and changing
the filter. Refer to later section for pumpdown procedure.
CE 063 and Larger Compressors - The oil filter in these compressors can be changed by
simply isolating the filter cavities. Close the oil discharge line service valve at the oil pump (at
the filter on CE126). Remove the filter cover; some foaming can occur but the check valve
should limit leakage from other compressor cavities. Remove the filter, replace with new
element, and replace filter cover using a new gasket. Reopen the valve in the pump discharge
line and purge air from the oil filter cavity.
When machine is operated again, the oil level must be checked to determine if oil needs to be
added to maintain the proper operating level.
