Electrical Phasing - Trane IntelliPak 1 with Symbio 800 Installation, Operation And Maintenance Manual

Service and Maintenance
ZPS 2-Stage Compressors
For 20 and 25 ton systems which use 2-stage unloading
scrolls, please follow the same oil removal procedure for
VZH088 and VZH117 compressors described in the section
above.
For adding oil to these manifold sets, an oil refill port is
located on the oil equalizer line, as shown in the figure
below.
Figure 117. ZPS 2–stage compressor
Prior to reinstalling the oil equalizer line to each
compressor, replace the PTFE gasket on the oil equalizer
Rotolock fitting on each compressor. See (Fig. 141).
Torque Rotolock nut to the values listed in (Table 86).
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.
For oil removal and re-charging on VZH170* compressors,
follow the same procedure described in
Compressors," p. 137
VZH variable speed compressors include the addition of an
oil injection solenoid valve (2QM18) to provide
supplemental oil flow from an internal gear pump to the
scroll thrust bearing surface. The solenoid is de-energized
at low compressor speeds to allow supplemental oil flow
and ensure thrust surface lubrication. The solenoid is
energized at high compressor speeds to stop supplemental
lubrication. This prevents excessive oil circulation to the
system. The solenoid is controlled by the inverter and
switches at 3900 RPM for the VZH088, 3300 RPM for the
VZH117, and 2700 RPM for the VZH170.
The 115 VAC solenoid coil operation can be checked on
one of the solenoid leads with a clamp on amp meter.
Above 3900 RPM (VZH088) /3300 RPM (VZH117) /2700
RPM (VZH170), the amp meter should read about 0.5
amps to indicate supplemental flow has been stopped.
138
"CSHD and CSHN
Figure 118. Oil injection solenoid valve
Table 70. Oil charge per compressor
Compressor
CSHD103
ZPS122, ZP104
ZP154-182
CSHD075-092
CSHD105-161, VZH088
CSHD175-183, VZH117
CSHN176-315, VZH170
CSHN374
Table 71. Torque requirements for rotolock fittings
CSHD*, VZH088, and VZH117
CSHN* and VZH170
Note: 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,
Pints
5.0
5.3
7.1
6.3
7.0
7.6
14.2
15.2
64 +/- 12 ft-lbs
100 +/- 10 ft-lbs
RT-SVX072D-EN