Recommended Compressor Oil Change; Purge System; Leak Checking Based On Purge Pump Out; Time - Trane CVHE Installation, Operation And Maintenance Manual

Table 20. Recommended maintenance of optional features
Feature Every 3 months
Waterbox Coatings Inspect waterbox coatings within the
first 1–3 months to determine a required
maintenance schedule for your job site.
Refer to "Waterbox and Tubesheet
Protective Coatings," p. 73
information.
Waterbox Anodes Inspect waterbox anodes within the first
1–3 months to determine a required
maintenance schedule for your job site.
Refer to "Sacrificial Anodes," p. 73
more information.
Gantries
Hinges
Recommended Compressor Oil
Change
After the first six months of accumulated operation, or
after 1,000 hours operation—whichever comes first—it is
recommended to change the oil and filter. After this oil
change, it is recommended to subscribe to the Trane
annual oil analysis program rather than automatically
change the oil as part of scheduled maintenance. Change
the oil only if indicated by the oil analysis. Use of an oil
analysis program will reduce the chiller's overall lifetime
waste oil generation and minimize refrigerant emissions.
The analysis determines system moisture content, acid
level, and wear metal content of the oil, and can be used
as a diagnostic tool. The oil analysis should be performed
by a qualified laboratory that is experienced in refrigerant
and oil chemistry and in the servicing of Trane
chillers.
In conjunction with other diagnostics performed by a
qualified service technician, oil analyses can provide
valuable information on the performance of the chiller to
help minimize operating and maintenance costs and
maximize its operating life. A drain fitting is installed after
the oil filter for obtaining oil samples.
Notes:
• Use only Trane OIL00022. A full oil change is 9 gallons
(34.1 L) of OIL00022.
• One spare oil filter is provided with each new chiller. If
not used earlier, use at first recommended oil and filter
change.
• This recommended oil change is not covered by
factory warranty.

Purge System

The use of low-pressure refrigerant in CenTraVac chillers
permits any section of the unit to be below atmospheric
pressure, regardless of whether the unit is running. This
creates an environment in which air or moisture could
enter the unit. If these noncondensables are allowed to
CVHE-SVX02H-EN
Every 6 months
for more
for
accumulate while the chiller is running, they become
trapped in the condenser; this situation increases
condensing pressure and compressor power
requirements, and reduces the chiller's efficiency and
cooling capacity. Therefore, proper maintenance of the
purge system is required.
The Trane EarthWise™ Purge is the only purge system
available for the CenTraVac chiller. The purge is designed
to remove noncondensable gases and water from the
refrigeration system. EarthWise Purge unit operation,
maintenance and troubleshooting is covered by a separate
operation and maintenance manual, which may be
obtained from the nearest Trane office.

Leak Checking Based on Purge Pump Out

Time

®
centrifugal
Use the following formula to calculate the annual
refrigerant leakage rate based on the daily purge pump out
time and the unit refrigerant charge.
Formula: % annual leakage rate = [(X min/day)*(0.0001 lb
R-123/min)/(Y lb)]*100
•
•
Figure 44
to do a leak check of a chiller based on the purge pump out
time and unit size. This figure depicts normal purge pump-
out times, small leaks and large leaks based on the chiller
tonnage.
If the purge pump-out time is in the small leak region, then
a leak check should be performed and all leaks repaired at
the earliest convenience. If the purge pump-out time is in
the large leak region, a thorough leak check of the unit
should be performed immediately to find and fix the leaks.
Recommended Maintenance
Annually
Lubricate the gantries annually. Use ConocoPhillips
®
MegaPlex XD3 (gray in color), LPS
Purpose (blue in color), or equivalent.
Lubricate the hinges annually. Use ConocoPhillips
®
MegaPlex XD3 (gray in color), LPS
Purpose (blue in color), or equivalent.
X= minutes/day of purge pump out operation
Y= initial refrigerant charge
has been developed to aid in determining when
®
MultiPlex Multi-
®
MultiPlex Multi-
71