Oil Charging Procedure
Proper charging of the oil system is
critical to the reliability of the
compressor and chiller.
Too little oil can cause the compressor
to run hot and inefficiently. When
taken to an extreme, low oil level may
result in infant failure of the
compressor. Too much oil will result in
high oil- circulation rates, which will
foul the condenser and evaporator
performance. This will result in
inefficient operation of the chiller.
Taken to an extreme, high oil levels
may result in erratic expansion valve
control or shut down of the chiller due
to low evaporator-refrigerant
temperature. Too much oil may
contribute to long-term bearing wear.
Additionally, excessive compressor
wear is probable when the
compressor is started with the oil
lines dry.
Note: The oil system schematics are
represented in Figures 27-29.
The oil system consists of the
following components:
• Compressor
• Oil separator
• Discharge line with optional service
valve
• Oil line from separator to
compressor
• Oil line drain (lowest point in
system)
• Oil cooler
• Oil temperature sensor
• Oil line shut off valve with flare
service connection
• Oil filter (internal to compressor)
with flare fitting service connection
and schrader valve
• Oil flow control valve (internal to
the compressor after the filter)
The standard oil charge for each
circuit size is in Table 41.
Table 41 - Standard oil charge (l) (1)
Unit size Circuit A Circuit B
Standard
Partial Heat Recovery
Free Cooling
RTAD 085 6 6
RTAD 100 7 7
RTAD 115 9 9
RTAD 125-145-150 10 10
RTAD 165 15 11
RTAD 180 15 15
RTAD 085 HE 6 6
RTAD 100 HE 7 7
RTAD 115-125 HE 10 10
RTAD 145-150 HE 11 11
Total Heat Recovery
RTAD 100 5 4
RTAD 115-125-145-150 8 7
RTAD 165 13 7
RTAD 180 13 12
RTAD 085-100 HE 5 4
RTAD 115-125-145-150 HE 8 7
Note: Size 085 does not exist for Total Heat Recovery
option but HE version is available
(1) Including oil charge within compressors.
Recommendation: check the oil level
in the sump using a sight glass
attached to charging hoses.
Lubrication System
The lubrication system has been
designed to keep most of the oil
lines filled with oil as long as there
is a proper oil level in the oil sump.
The total oil charge can be removed
by draining the oil system, oil return
line from the evaporator, the
evaporator, and the compressor.
Very small quantities of oil may be
found in other components.
80 RTAD-SVX01F-E4
Maintenance Procedures
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