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Maintenance
5. Contact a Trane service organization to leak test the
chiller, to check operating and safety controls, and to
inspect electrical components for deficiencies.
6. Clean and repaint any areas that show signs of
corrosion.
7. Clean the condenser coils. See Condenser Coil
Cleaning section of Maintenance chapter.
NOTICE
Coil Damage!
Use of detergents could cause damage to coils.
Do not use detergents to clean coils. Use clean water
only.
Refrigerant and Oil Charge
Management
Proper oil and refrigerant charge is essential for proper unit
operation, unit performance, and environmental protection.
Only trained and licensed service personnel should service
the chiller.
The following table lists baseline measurements for chillers
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 following table. Contact your local
Trane office for more information.
Table 28. Typical baselines (AHRI conditions)
Measurement
Evaporator Pressure
Evaporator Approach
EXV Position
Evaporator Temp - entering
Evaporator Temp - leaving
Discharge Superheat
Condenser Pressure
Subcooling
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.
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.
94
Baseline
51 psia
3.4°F average
45-65% open
54°F
44°F
16.5°F
212 psia
10 to 20°F
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 compressors off.
3. Let the chiller sit (powered, but off line) 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 30 minutes of heater
ON dwell time, but oil charge adjustments should not
be made without allowing the oil heaters to run for a
minimum of 4 hours.
NOTICE
Equipment Damage!
Operating compressors with service valves open will
result in severe oil loss and equipment damage.
Never operate the compressor with the sight glass
service valves opened. Close the valves after
checking the oil level.
4. Attach a 3/8 inch or 1/2 inch hose with a sightglass in
the middle to the oil sump service valve (1/4 inch flare)
and the oil separator service valve (1/4 inch flare). See
the following figure for valve locations.
Note: High pressure rated clear hose with appropriate
fittings can help speed up the process. Hose
must be rated to withstand system pressures as
found on unit nameplate.
Figure 39. Oil service valves
To Oil Separator Service Valve
Oil Service Valve
5. After the unit is off line for 30 minutes, move the
sightglass along the side of the oil sump.
6. The nominal oil level from the bottom of the oil
separator should be as shown in the following table and
figure. Depending on running conditions and oil heater
dwell time, some deviation from nominal levels is
expected.
AC-SVX003A-EN
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