Installation and Maintenance Manual

100 RTAC-SVX01M-EN
Maintenance
Perform all maintenance procedures and inspections at
the recommended intervals.This will prolong the life of
the chiller and minimize the possibility of costly failures.
Use the “Operator’s Log”, such as that show in chapter
“Log and Check Sheet,” p. 124 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 maintenance inspections, see
“Diagnostics,” p. 103.
After unit has been operating for approximately 30
minutes and system has stabilized, check the operating
conditions and complete procedures below:
Weekly
While unit is running in stable conditions.
1. Check MP pressure for evaporator, condenser and
intermediate oil.
2. Observe liquid line sight glass on EXV.
3. If liquid line sight glass has bubbles measure the
subcooling entering the EXV.The subcooling should
never be less than 4°F under any circumstances.
Important: A clear sightglass alone does not mean that
the system is properly charged. Also check
the rest of the system operating conditions.
4. Inspect the entire system for unusual conditions and
inspect the condenser coils for dirt and debris. If the
coils are dirty, refer to coil cleaning.
Monthly
1. Perform all weekly maintenance procedures.
2. Record the system subcooling.
3. Make any repairs necessary.
Annual
1. Perform all weekly and monthly procedures.
2. Check oil sump oil level while unit is off.
Note: Routine changing of oil is not required. Use an oil
analysis to determine condition of oil.
3. Have a qualified laboratory perform a compressor oil
analysis to determine system moisture content and
acid level.This analysis is a valuable diagnostic tool.
4. Contact a qualified service organization to leak test the
chiller, to check operating and safety controls, and to
inspect electrical components for deficiencies.
5. Inspect all piping components for leakage and
damage. Clean out any inline strainers.
6. Clean and repaint any areas that show signs of
corrosion.
7. Clean the condenser coils.
8. Check and tighten all electrical connections as
necessary.
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.
Table 64 lists baseline measurements for RTAC 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 localTrane office.
Note: Low temperature applications units will have
values that vary from Table 64. Contact your local
Trane office for more information.
WARNING
Hazardous Voltage w/Capacitors!
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 an appropriate voltmeter that all
capacitors have discharged. Failure to disconnect
power and discharge capacitors before servicing could
result in death or serious injury.
For additional information regarding the safe discharge
of capacitors, see PROD-SVB06A-EN
Table 64. Typical RTAC baselines (AHRI conditions)
Measurement Baseline
Evaporator Pressure 49.5 psia
Evaporator Approach 3.5°F
EXV Position 45-50%
Evaporator - entering 54°
Evaporator - leaving 44°
Discharge Superheat 26.6°F
Condenser Pressure 226 psia
Subcooling 18-23°F