RLC-SVX09Q-EN
65
Note: It may be desirable to perform tube tests on
these components at more frequent intervals,
depending upon chiller application. This is
especially true of critical process equipment.
• Depending on chiller duty, contact a qualified service
organization to determine when to conduct a complete
examination of the unit to determine the condition of the
compressor and internal components.
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.
Tables below list baseline measurements for 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 Trane service.
Note: AHRI conditions are: condenser water: 85°F and 3
GPM per ton and evaporator water: 54 to 44°F.
Table 23. RTWD operation conditions at full load
Description Condition
Refrigerant
R515B R513A
Evaporator Pressure
(psig)
21-25 38-44
Condensing Pressure
(psig)
83-91 125-137
Discharge Superheat
(°F)
13-23 14-24
Subcooling (°F)
7-11 7-12
Note: All conditions stated above are based on the unit running fully
loaded at AHRI conditions. If full load conditions cannot be met,
contact Trane service.
Table 24. RTWD operation conditions at minimum
load
Description Condition
Refrigerant
R515B R513A
Evaporator approach
(°F)
0.3-2.7 0.2-2.7
Table 24. RTWD operation conditions at minimum
load (continued)
Description Condition
Condensing approach
(°F)
0.4-2.9 0.5-3.4
Subcooling (°F)
3.3-5.2 3.6-5.3
EXV percent open
(%)
15%-30 17%-35
Note: Conditions at minimum must be – entering condenser water: 85°F
and entering evaporator water: 55°F.
Heat Exchanger Maintenance
Cleaning the Condenser
NOTICE
Proper Water Treatment Required!
The use of untreated or improperly treated water
could result in scaling, erosion, corrosion, algae or
slime.
Use the services of a qualified water treatment
specialist to determine what water treatment, if any, is
required. Trane assumes no responsibility for
equipment failures which result from untreated or
improperly treated water, or saline or brackish water.
Condenser tube fouling is suspected when the approach
temperature (i.e., the difference between the refrigerant
condensing temperature and the leaving condenser water
temperature) is higher than predicted.
Standard water applications will operate with less than a
10°F approach. If the approach exceeds 10°F, cleaning the
condenser tubes is recommended.
Note: Glycol in the water system may as much as double
the standard approach.
If the annual condenser tube inspection indicates that the
tubes are fouled, two cleaning methods can be used to rid
the tubes of contaminants.
• Mechanical tube cleaning method is used to remove
sludge and loose material from smooth-bore condenser
tubes. See “Mechanical Cleaning Procedure,” p. 66.
• Chemical cleaning procedures are used to remove
scale deposits. See “Chemical Cleaning Procedure,” p.
68.
Maintenance
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