AC-SVX003A-EN
93
Maintenance
WARNING
Hazardous Voltage - Pressurized
Flammable Fluid!
Failure to follow all electrical safety precautions could
result in death or serious injury.
Do not operate compressor without terminal box
cover in place.
The motors in the compressors have strong
permanent magnet motors and have the capability to
generate voltage during situations when the
refrigerant charge is being migrated. This potential
will be present at the motor terminals and at the
output of the variable speed drives in the power panel.
Before removing compressor terminal box cover for
servicing, or servicing power side of control panel,
CLOSE COMPRESSOR DISCHARGE SERVICE VALVE
and disconnect all electric power including remote
disconnects. Discharge all motor start/run capacitors.
Follow lockout/tagout procedures to ensure the
power cannot be inadvertently energized. Verify with
an appropriate voltmeter that all capacitors have
discharged.
The compressor contains hot, pressurized refrigerant.
Motor terminals act as a seal against this refrigerant.
Care should be taken when servicing NOT to damage
or loosen motor terminals.
WARNING
Pressurized Burning Fluid!
Failure to follow the instructions below could result in
death or serious injury.
Do not operate compressor without terminal box
cover in place.
The compressor contains hot, pressurized refrigerant.
Motor terminals act as a seal against this refrigerant.
Care should be taken when servicing NOT to damage
or loosen motor terminals.
WARNING
Hazardous Voltage w/Capacitors!
Failure to disconnect power and discharge capacitors
before servicing could result in death or serious
injury.
Disconnect all electric power, including remote
disconnects and discharge all motor start/run
capacitors before servicing. Follow proper lockout/
tagout procedures to ensure the power cannot be
inadvertently energized. For variable frequency drives
or other energy storing components provided by
Trane or others, refer to the appropriate
manufacturer’s literature for allowable waiting periods
for discharge of capacitors. Verify with a CAT III or IV
voltmeter rated per NFPA 70E that all capacitors have
discharged.
This section describes the basic chiller preventive
maintenance procedures, and recommends the intervals at
which these procedures should be performed. Use of a
periodic maintenance program is important to ensure the
best possible performance and efficiency.
Use an Operator Log (see Log and Check Sheet chapter)
to record an operating history for unit. The log serves as a
valuable diagnostic tool for service personnel. By observing
trends in operating conditions, an operator can anticipate
and prevent problem situations before they occur.
If unit does not operate properly during inspections, see
Diagnostics chapter.
Recommended Maintenance
Weekly
While unit is running in stable conditions.
1. At AdaptiView™ TD7 or Tracer® TU service tool, check
pressure for evaporator, condenser and intermediate
oil.
2. Observe liquid line sight glass on EXV. If liquid line
sight glass has bubbles measure the subcooling
entering the EXV. Subcooling should always be greater
than 10°F for single compressor circuits, and 5°F for
dual compressor circuits.
3. Inspect the entire system for unusual operation.
4. Inspect the condenser coils for dirt and debris. If the
coils are dirty, 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.
Monthly
1. Perform all weekly maintenance procedures.
2. Record the system subcooling.
Annual
1. Perform all weekly and monthly procedures.
2. Check oil level while unit is off. See Maintenance
chapter.
3. Perform pH test of drive cooling fluid. See pH Test
section of Maintenance chapter.
4. Have a qualified laboratory perform a compressor oil
analysis to determine system moisture content and acid
level.
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