RT-SVX063E-EN
127
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.
Figure 91.
CSHN
Oil equalizer Rotolock
connection fitting
¼ Schrader port
Oil drain valve
VZH Variable Speed Compressors
Refer to
“CSHN Compressors,” p. 127
for VZH117 oil
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 injection solenoid
Table 68.
Oil charge per compressor
Compressor
Pints
CSHD103
5.0
CSHD075-092
6.3
CSHD105-161, VZH088
7.0
CSHD175-183, VZH117
7.6
CSHN176-315, VZH170
14.2
CSHN374
15.2
Table 69.
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
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