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High superheat
•
A compressor mechanical failure
•
Occurrence of a motor burnout.
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 and CSHN Compressors
CSHD and 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 114. PTFE gasket
RT-SVX072D-EN
Service and Maintenance
Figure 115. CSHD compressor
524.9
(20.67)
493.9
(19.44)
86.0
(3.39)
Figure 116. CSHN
VZH Variable Speed Compressors
For oil removal and re-charging on VZH088* and VZH117*
compressors, this will require that the oil be removed using
a suction or pump device through the oil equalizer Rotolock
fitting. Use a dedicated device for removing oil. It is good
practice to flush the suction device with clean oil prior to
use.
Place a catch pan under the oil equalizer Rotolock
connection fitting on the compressor to catch the oil that
will come out of the compressor when the oil equalizer tube
is removed from the compressor.
Oil equalizer Rotolock
connection fitting
¼ Schrader port
Oil drain valve
137
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