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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
125. Torque Rotolock nut to the values listed in
126.
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.
Figure 90. PTFE gasket
CSHN Compressors
CSHN 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.
RT-SVX063G-EN
Figure 90, p.
Table 70, p.
Service and Maintenance
Figure 91. CSHN
VZH Variable Speed Compressors
Refer to
"CSHN Compressors," p. 125
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
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.
Figure 92. Oil injection solenoid valve
Oil equalizer Rotolock
connection fitting
¼ Schrader port
Oil drain valve
for VZH117 oil
125
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