Trane IntelliPak 1, Installation, Operation And Maintenance Manual, Page: 142 / 164

142 RT-SVX072A-EN
RPM (VZH170), the amp meter should read about 0.5
amps to indicate supplemental flow has been stopped.
Figure 115. Oil injection solenoid valve
Oil injection solenoid
Table 67. Oil charge per compressor
Compressor
Pints
CSHD103 5.0
ZPS122, ZP104
5.3
ZP154-182 7.1
CSHD075-092 6.3
CSHD105-161, VZH088
7.0
CSHD175-183, VZH117
7.6
CSHN176-315, VZH170
14.2
CSHN374 15.2
Table 68. Torque requirements for rotolock fittings
CSHD*, VZH088, and VZH117 64 +/- 12 ft-lbs
CSHN* and VZH170 100 +/- 10 ft-lbs
N No otte e:: Always replace gasket when reassembling oil
equalizer lines.
Electrical Phasing
If it becomes necessary to replace a compressor, it is
very important to review and follow the Electrical
Phasing procedure described in the startup procedure
of the IOM.
If the compressors are allowed to run backward for
even a very short period of time, internal compressor
damage may occur and compressor life may be
reduced. If allowed to run backwards for an extended
period of time the motor windings can overheat and
cause the motor winding thermostats to open. This will
cause a “compressor trip” diagnostic and stop the
compressor
If a scroll compressor is rotating backwards, it will not
pump and a loud rattling sound can be observed.
Check the electrical phasing at the compressor terminal
box. If the phasing is correct, before condemning the
compressor, interchange any two leads to check the
internal motor phasing.
75 Ton eFlex ™ ™ Variable Speed Tandem
The 75 Ton eFlex ™ variable speed compressor is
manifolded with a CSHN fixed speed compressor. It
uses a patented manifold design that is different from
fixed speed tandems as follows:
1. The variable speed compressor is always first on
and located upstream in the suction line in position
1B;
2. A nozzle in the suction tee, directly upstream of the
manifold set, separates suction oil return to the
upstream variable speed compressor. It also
provides a sump pressure difference to move
excess oil from the variable speed to the fixed
speed compressor when both compressors are
running. The nozzle is specifically sized for this
variable speed manifold compressor combination
and must not be removed.
Suction restrictors are not used, and a smaller 3/8"
OD oil equalizer line is used to help maintain the
sump pressure differential.
Figure 116. eFlex variable speed tandem
Fixed
speed
compressor
Variable
speed
compressor
Combined
suction
flow
Nozzle
Inflow
Precision Suction Restrictor
Tandem manifold compressors that have unequal
capacity sizes use a precision suction restrictor to
balance the oil levels in the compressors (see figure
below). This restrictor is placed in the smaller capacity
compressor. When replacing this compressor, it is
imperative that the proper restrictor is selected from
those provided with the replacement compressor.
When the compressors are restarted, verify that correct
oil levels are obtained with both compressors
operating.
S Se errv viicce e a an nd d M Ma aiin ntte en na an ncce e