Maintenance
RTAF-SVX001K-EN 73
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.
Lubrication System
Oil Sump Level Check
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
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.
2. Cycle the compressor offline.
3. Let the chiller sit (powered, but offline) to allow the oil
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.
Table 28. Typical Sintesis baselines (AHRI conditions)
Measurement Baseline
Evaporator Pressure 50.5 psia
Evaporator Approach 3°F
EXV Position 45% open
Evaporator Fluid delta T - entering 54°F
Evaporator Fluid delta T - leaving 44°F
Discharge Superheat 25°F
Condenser Pressure 195 psia
Subcooling 18°F
Figure 50. Oil sump level check
1 Oil Separator 3 Refrigeration hose
2 Valves 4 Sight Glass
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