Installation and Maintenance Manual

68 RTAE-SVX001B-EN
Maintenance
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 from a Stealth™
chiller.
Use an Operator Log (see “Log and Check Sheet,” p. 90)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,” p. 73.
WARNING
Hazardous Voltage - Pressurized Burning
Fluid!
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.
Do not operate compressor without terminal box cover
in place.
Failure to follow all electrical safety precautions could
result in death or serious injury.
For additional information regarding the safe discharge
of capacitors, see “Adaptive Frequency™ Drive (AFD
3
)
Capacitor Discharge,” p. 32 and PROD-SVB06A-EN.
WARNING
Hazardous Voltage w/Capacitors!
Disconnect all electric power, including remote
disconnects and discharge all motor start/run and AFD
(Adaptive Frequency™ Drive) 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 byTrane or others, refer to the
appropriate manufacturer’s literature for allowable
waiting periods for discharge of capacitors. Verify
with an appropriate voltmeter that all capacitors
have discharged.
• DC bus capacitors retain hazardous voltages after
input power has been disconnected. Follow proper
lockout/tagout procedures to ensure the power
cannot be inadvertently energized. After
disconnecting input power, wait five (5) minutes for
the DC capacitors to discharge, then check the
voltage with a voltmeter. Make sure DC bus
capacitors are discharged (0 VDC) before touching
any internal components.
Failure to follow these instructions could result in death
or serious injury.
For additional information regarding the safe discharge
of capacitors, see “Adaptive Frequency™ Drive (AFD
3
)
Capacitor Discharge,” p. 32 and PROD-SVB06A-EN.