126
RT-SVX063E-EN
Figure 89.
Pressure curve — 75 tons eFlex variable speed
250
300
350
400
450
500
550
90
100
110
120
130
140
150
160
170
180
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Suction Pressure, PSIG
105
°
F Ambient
95
°
F Ambient
85
°
F Ambient
75
°
F Ambient
65
°
F Ambient
75T eFlex Variable Speed - circuit 1 only
(Use 75T Standard Capacity for circuit 2)
N
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nss:: Suction pressure = 132 psig; Discharge pressure = 433 psig;
Subcooling leaving outdoor coil = 21°F.
•
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nss:: Subcooling range: 19-23°F.
Compressor Oil
Refer to
Table 68, p. 127
for the appropriate scroll
compressor oil charge. Remove and measure oil from
any compressor replaced. Adjust oil in replacement
compressor to prevent excessive oil in system.
Anytime a compressor is replaced, the oil for each
compressor within the manifold must be replaced.
The scroll compressor uses Trane OIL00079 (one quart
container) or OIL00080 (one gallon container) without
substitution. Discoloration of the oil indicates that an
abnormal condition has occurred. If the oil is dark and
smells burnt, it has overheated because of the
following:
•
Compressor operating at extremely high
condensing temperatures
•
High superheat
•
A compressor mechanical failure
•
Occurrence of a motor burnout.
If a motor burnout is suspected, use an acid test kit
(KIT15496) to check the condition of the oil. Test results
will indicate an acid level has exceeded the limit if a
burnout occurred. Oil test kits must be used for POE oil
(OIL00079 for a quart container or OIL00080 for a gallon
container) to determine whether the oil is acidic. If a
motor burnout has occurred, change the oil in both
compressors in a tandem set.
CSHD Compressors
CSHD compressors include a lower shell shraeder
fitting that can be used to reduce the sump oil level
below the bottom of the equalizer line Rotolock fitting.
This fitting does not allow removal of all the sump oil,
but just enough to prevent oil spills when the equalizer
line Rotolock fitting is removed.
Prior to reinstalling the oil equalizer line to each
compressor, replace the PTFE gasket on the oil
equalizer Rotolock fitting on each compressor. See
Figure 90, p. 127
. Torque Rotolock nut to the values
listed in
Table 69, p. 127
.
Charge the new oil into the Schrader valve on the shell
of the compressor. Due to the moisture absorption
properties of POE oil, do not use POE oil from a
previously opened container. Also discard any excess
oil from the container that is not used.
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