CVHE-SVX005C-EN
87
Recommended Maintenance
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.
NOTICE
Check Purge Run-Time for Unit
Hermetic Integrity!
Failure to follow instructions below could result in
chiller damage.
If frequent purging is required, monitor purge
pumpout rate, and identify and correct source of air or
water leak as soon as possible to prevent moisture
contamination caused by leakage.
NOTICE
Do Not Use Non-Compatible Parts or
Materials!
Use of non-compatible parts or materials could result
in equipment damage.
Only genuine Trane® replacement components with
identical Trane part numbers should be used in Trane
CenTraVac chillers. Trane assumes no responsibility
for damages resulting from the use of non-compatible
parts or materials.
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
CenTraVac™ chiller.
For R-514A chillers, recommended purge maintenance
procedures are detailed in Operation and Maintenance
Guide: Purge System for Water-Cooled CenTraVac™
Chillers with Symbio™ Control, R-514A Refrigerant
(PRGG-SVX002*-EN).
Record Keeping Forms
An important aspect of the chiller maintenance program is
the regular completion of records. Refer to “Appendix A:
Forms and Check Sheets,” p. 97 for copies of the
recommended forms. When filled out accurately by the
machine operator, the completed logs can be reviewed to
identify any developing trends in the chiller’s operating
conditions. For example, if the machine operator notices a
gradual increase in condensing pressure during a month’s
time, she can systematically check and then correct the
possible cause of this condition.
Normal Operation
Table 20. Normal operation
Operating Characteristic Normal Reading
Approximate Evaporator Pressure
6 to 9 psia (41.4 to 62.1 kPaA) /
-9 to -6 psig (-62.1 to -41.4 kPaG)
Approximate Condenser Pressure
(a)
,
(b)
17 to 27 psia (117.2 to 182.2 kPaA) /
2 to 12 psig (13.8 to 82.7 kPaG)
(standard condenser)
Oil Sump Temperature
Unit not running
140°F to 176°F (60.0°C to 80.0°C)
Oil Sump Temperature
Unit running
95°F to 162°F (35.0°C to 72.2°C)
Oil Sump Differential
Oil Pressure
(c)
18 to 22 psid (124.1 to 151.7 kPaD)
(a)
Condenser pressure is dependent on condenser water temperature, and should equal the saturation pressure of the refrigerant at a temperature above that of leaving
condenser water at full load.
(b)
Normal pressure readings for ASME condenser exceed 12 psig (82.7 kPaG).
(c)
Oil tank pressure: -9 to -6 psig (-62.1 to -41.4 kPaG). Discharge oil pressure: 7 to 15 psig (48.3 to 103.4 kPaG).
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