Trane Technologies CenTraVac CVHE, Installation, Operation And Maintenance Manual

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88 CVHE-SVX005B-EN
Recommended Maintenance
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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-123
chillers, recommended purge maintenance procedures
are detailed in
Operation and Maintenance Guide:
EarthWise Purge System with Tracer AdaptiView
Control for Water-Cooled CenTraVac Chillers with R-
123 Refrigerant
(PRGF-SVX01*-EN). 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
“,” 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.
Table 20. Normal operation (continued)
(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).