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Refrigerant and Oil
Charge Management
Proper oil and refrigerant charge is essential for proper
unit operation, unit performances, and environmental
protection. Only trained and licensed service personnel
should service the chiller.
Table below lists baseline measurements for Sintesis™
units running at AHRI standard operating conditions. If
chiller measurements vary significantly from values listed
below, problems may exist with refrigerant and oil charge
levels. Contact your local Trane office.
Note: Low temperature applications units will have
values that vary from the table below. Contact your
local Trane office for more information.
Table 28. Typical Sintesis baselines (AHRI conditions)
Measurement
Evaporator Pressure
Evaporator Approach
EXV Position
Evaporator Fluid delta T - entering
Evaporator Fluid delta T - leaving
Discharge Superheat
Condenser Pressure
Subcooling
RTAF-SVX001K-EN
Lubrication System
Oil Sump Level Check
Figure 50. Oil sump level check
Baseline
50.5 psia
3°F
45% open
54°F
44°F
25°F
195 psia
18°F
1
2
The oil level in the sump can be measured to give an
indication of the system oil charge. Follow the procedures
below to measure the level.
1. Run the unit as near to full load as possible for a
2. Cycle the compressor offline.
3. Let the chiller sit (powered, but offline) to allow the oil
4
3
Oil Level
Oil Separator
Valves
minimum of 30 minutes. For an accurate reading, 40 or
more minutes at full load with normal/steady
discharge superheat readings and no limits/warnings
is recommended. Assessing oil charge after running at
minimum or low loads may lead to an inaccurate
reading.
separator heater to boil off the refrigerant that may be
in the oil separator. An initial assessment of the oil
separator level may be made after heater has been ON
for 30 minutes, but oil charge adjustments should not
be made without allowing the oil heaters to run for a
minimum of 4 hours.
Maintenance
2
1
2
3
Refrigeration hose
4
Sight Glass
73
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