Cshp Compressors; Vzh Variable Speed Compressors; Electrical Phasing; Variable Speed Manifolded With Fixed Speed Compressors - Trane IntelliPak 3 with Symbio 800 Installation, Operation And Maintenance Manual

Figure 103. PTFE gasket

CSHP Compressors

CSHP compressors have an oil drain valve which allows
the oil to be drained out of the compressor. After the
refrigerant has been recovered, pressurize the system with
nitrogen to help remove the oil from the compressor.
Charge the new oil into the Schrader valve or oil drain 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.
Figure 104. CSHP

VZH Variable Speed Compressors

Refer to "CSHP Compressors," p. 151
removal procedures.
VZH variable speed compressors include the addition of an
oil injection solenoid valve (2L11) to provide supplemental
oil flow from an internal gear pump to the scrolls. The
solenoid is de-energized at low compressor speeds to
allow supplemental oil flow and better seal scrolls. 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
RT-SVX080A-EN
Oil equalizer Rotolock
connection fitting
¼ Schrader port
Oil drain valve
for VZH117 oil
inverter and switches at 3900 RPM for the VZH088, 3300
RPM for the VZH117, and 2700 RPM for the VZH170.
The 24 VAC solenoid coil operation can be checked on one
of the solenoid leads with a clamp on amp meter. Above
3300 RPM (VZH117) /2700 RPM (VZH170), the amp meter
should read about 0.5 amps to indicate supplemental flow
has been stopped.
Table 70. Oil charge per compressor
Compressor
CSHE071-088
CSHE097-152
CSHE177
CSHP178
VZH088C
VZH117C
VZH170C
Table 71. Torque requirements for rotolock fittings
CSHE* VZH088 and VZH117
CSHP* 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,
interchange any two leads to check the internal motor
phasing.
Variable Speed Manifolded with Fixed
Speed Compressors
Some models use an eFlex™ variable speed compressor
manifolded with a 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 1A;
2. A nozzle in the suction tee, directly upstream of the
Service and Maintenance
Pints
6.3
7
7.6
14.2
8
8.7
16.3
64+/- 12 ft-lbs
100+/- 10 ft-lbs
151