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Recommended Maintenance
Notes:
•
Use only Trane compressor oil and verify
proper refrigerant and oil for your chiller before
proceeding! A full compressor oil change is 9
gallons (34.1L) of oil for each sump of the
R514A Duplex chiller.
–
For chillers with R-123 refrigerant, use
OIL00022 (2.5 gallon [9.5 L] containers)
compressor oil.
–
For chillers with R-514A refrigerant, use
OIL00379 (1 gallon [3.8 L] containers)/
OIL00380 (5 gallon [18.9 L] containers)
compressor oil.
–
For air-run operation use OIL00381 (1
gallon [3.8L] containers)/OIL00382 (5
gallon [18.9L] containers) compressor oil.
•
One spare compressor oil filter is provided with
each new chiller. If not used earlier, use at first
recommended compressor oil and filter change.
•
This recommended compressor 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 non-condensables are allowed to
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 purge is designed to remove non-condensable gases
and water from the refrigeration system. For R-514A
chillers, operation, maintenance, and troubleshooting
procedures are detailed in Operation and Maintenance
Guide: Purge System for Water-Cooled CenTraVac™
Chillers with Symbio™ Control, R-514A Refrigerant
(PRGG-SVX002*-EN).
Leak Checking Based on Purge Pump
Out Time
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
of refrigerant/min)/(Y lb)]*100
•
X = minutes/day of purge pump out operation
•
Y = initial refrigerant charge
The following figure has been developed to aid in
determining when to do a leak check of a chiller based on
the purge pump-out time and unit size. This figure depicts
90
normal purge pump-out times, small leaks, and large leaks
based on 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.
Figure 60. Purge operation under typical and leak
conditions
140
Large Leak
120
Small Leak
Typical Operation
100
80
60
40
20
0
400
600
800
1000
Chiller Tons per Circuit
Long Term Unit Storage
If the chiller will be stored for more than six months after
production, contact your local Trane Service Agency for
required extended storage actions to minimize impact to
the chiller and preserve the warranty. In addition, contact
your local Trane Service Agency for recommendations for
storage requirements for chillers to be removed from
service in excess of a normal seasonal shut-down.
WARNING
Refrigerant May Be Under Positive
Pressure!
Failure to follow instructions below could result in an
explosion which could result in death or serious
injury or equipment damage.
System contains refrigerant and may be under
positive pressure; system may also contain oil.
Recover refrigerant to relieve pressure before
opening the system. See unit nameplate for
refrigerant type. Do not use non-approved
refrigerants, refrigerant substitutes, or non-approved
refrigerant additives.
NOTICE
Equipment Damage!
Failure to protect the unit from freezing could result in
equipment damage.
If fluid has been added to the piping, the unit must be
protected from freezing. Freeze damage from an
unheated equipment room is not the Trane company's
responsibility. These are indoor units.
1200
1400
1600
1800
2000
CVHE-SVX005C-EN
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