Maintenance
17 4 RT-SVX36K-EN
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.
VZH compressors (40 – 70 Ton variable speed)
Refer to the proceeding CSHD section for VZH117 oil
removal procedures and the proceeding CSHN section for
VZH170 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
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 3300RPM for theVZH117, and 2700
RPM for the VZH170.
The 24 VDC 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.
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.
Figure 132. PTFE gasket
Figure 133. CSHN
Oil equalizer Rotolock
connection tting
¼ Schrader port
Oil drain valve
Figure 134. Oil injection solenoid valve
Table 75. Oil charge per compressor
Compressor Pints
CSHD 092 6.3
CSHD 110 thru 183 and
VZH117
7.0
CSHN 176 thru 315 and
VZH170
14.2
Table 76. Torque requirements for rotolock fittings
CSHD* and VZH117 64 +/- 12 ft-lbs
CSHN* and VZH170 100 +/- 10 ft-lbs
Oil injection solenoid
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